# K230 video output API reference ## Overview The VO (Video Output) module actively reads video and graphics data from the corresponding location in the memory, and outputs the video and graphics through the corresponding display device. Display/writeback devices, video layers and graphics layers supported by the chip. LAYER layer supports: | | LAYER0 | LAYER1 | LAYER2 | |------------|--------------------|--------------------|---------------------------| | Input format | YUV420 NV12 | YUV420 NV12 | YUV420 NV12 YUV422 NV16 ? | | maximum resolution | 1920x1080 | 1920x1080 | 1920x1080 | | Overlay display | Supports configurable overlay order | Supports configurable overlay order | Supports configurable overlay order | | Rotation | √ | √ | - | | Scaler | √ | - | - | | Mirror | √ | √ | - | | Gray | √ | √ | - | | independent switch | √ | √ | √ | OSD layer support | | OSD0 | OSD1 | OSD2 | OSD3 | |--------------------|-----------------------------------------------------------|-----------------------------------------------------------|-----------------------------------------------------------|-----------------------------------------------------------| | Input format | RGB888 RGB565 ARGB8888 Monochrome-8-bit RGB4444 RGB1555 | RGB888 RGB565 ARGB8888 Monochrome-8-bit RGB4444 RGB1555 | RGB888 RGB565 ARGB8888 Monochrome-8-bit RGB4444 RGB1555 | RGB888 RGB565 ARGB8888 Monochrome-8-bit RGB4444 RGB1555 | | maximum resolution | 1920x1080 | 1920x1080 | 1920x1080 | 1920x1080 | | Overlay display | Supports configurable overlay order | Supports configurable overlay order | Supports configurable overlay order | Supports configurable overlay order | | ARGB 265 grade ALPHA | √ | √ | √ | √ | | independent switch | √ | √ | √ | √ | ### Hardware description This hardware introduction is based on evblp3 #### Mipi interface The hardware pins on evblp3 are as follows: ![The image contains an icon and the description has been automatically generated](https://kendryte-download.canaan-creative.com/developer/pictures/d7197713d3821fdd3e5c0f2b10dfd5b1.png) - iic4 for screen touch iic (scl: gpio7, sda gpio8) - screen touch rst: gpio29, int: gpio30 - screen's rst: gpio9, backlight: gpio31 - Mipi pins correspond to screen pins one-to-one #### Physical picture ![The picture contains game console, electronics, circuit. Description has been automatically generated](https://kendryte-download.canaan-creative.com/developer/pictures/69dbfc0ef3144c90f5978f1019482030.png) - 1 in the picture is the mipi interface, which uses a soft cable - 2 in the picture is the mipi signal test point, including four data lines and one clk line. ### Software description The video output software configuration is divided into three parts: phy configuration, dsi configuration, and VO configuration. #### PHY configuration process The frequency of phy requires configuring three parameters, calculating PLL, configuring voc, and configuring freq. Based on these three parameters, the frequency of txphy can be determined. Each parameter is calculated as follows. ##### Calculate phy's pll The data rate is given by twice the PLL output clock phase frequency: Data Rate (Gbps) = PLL Fout(GHz) \* 2, where the output frequency is a function of the input reference frequency and the multiplication/division ratio. The calculation of phy's pll is divided into four ranges. Different frequencies correspond to different frequencies. It can be determined in the following ways: | M | m+2 | |--------|-----| | N | n+1 | | Fclkin | 24M | For： ![Text, Letter Description automatically generated](https://kendryte-download.canaan-creative.com/developer/pictures/e99b3eec46b58875ae936ea4ab23d86b.png) However, the following restrictions need to be followed in this case: ![Image contains text Description has been automatically generated](https://kendryte-download.canaan-creative.com/developer/pictures/cfd696fc1b6157fbf0220a4f1545a963.png) For： ![Text, Letter Description automatically generated](https://kendryte-download.canaan-creative.com/developer/pictures/e0df5cfd79b26cd1c688cb8f82000188.png) For： ![Text, Letter Description automatically generated](https://kendryte-download.canaan-creative.com/developer/pictures/fb853b016887c1d58cc45f4507d9276c.png) ![Text description has been automatically generated](https://kendryte-download.canaan-creative.com/developer/pictures/9cd0c8d3bd975f1f19a5eec9b846d00b.png) For： ![Text Medium confidence description has been automatically generated](https://kendryte-download.canaan-creative.com/developer/pictures/659e3d039a5c3c623b3ffd6fb24ee777.png) Each for above corresponds to a pll level, and different levels correspond to different calculation formulas and restrictions. The calculation examples are as follows: Example： The rate of mipi is 445.5M: so the rate of pll is 222.75M. The second formula should be selected, and the calculation is as follows 222750000 = 1M / 2N = (m+2) / 2(n+1) \* 24000000, the completed formula is as follows: 222.75n + 198.75 = 12m, calculated through excel as follows: ![Table description has been automatically generated](https://kendryte-download.canaan-creative.com/developer/pictures/8ff8dac9c9f9b815001733e37e44e4cc.png) The obtained m = 295, n = 15. m and n in the configuration pll are both integers. If all the values ​​are not integers, you need to add 1 and subtract 1 to the values ​​of m and n. Then work backwards to see which frequency is closest to what you need, and then verify whether it is available. If not, repeat the above operation. ##### Configure phy's voc To configure the voc of phy, you can query it according to the table: ![Table description has been automatically generated](https://kendryte-download.canaan-creative.com/developer/pictures/174b1b96f4a280ab5350f4ed5452d43f.png) ![Table description has been automatically generated](https://kendryte-download.canaan-creative.com/developer/pictures/8e1970bbd7ffb862547feaf8a59cab48.png) Example： The rate of mipi is 445.5M: so the rate of pll is 222.75M, voc = 010111 = 0x17 ##### configurefreq Configuring phy's freq can be queried according to the table: ![Table description has been automatically generated](https://kendryte-download.canaan-creative.com/developer/pictures/95941399975cca1c16253927129d8e19.png) ![Table description has been automatically generated](https://kendryte-download.canaan-creative.com/developer/pictures/22628c5b4acf510370e51188734fe172.png) ![Table description has been automatically generated](https://kendryte-download.canaan-creative.com/developer/pictures/4a233637850b4e84b5208317666c4314.png) Example： The rate of mipi is 445.5M: the rate of pll is 222.75M, freq selects 0100101, when configuring this, you need to set the highest bit\[7\] = 1, all freq = 10100101= 0xa5 #### DSI configuration DSI (Display Serial Interface) is a part of the alliance of a set of communication protocols defined by MIPI. It mainly implements digital controllers that implement all protocol functions defined in the MIPI DSI specification, including bidirectional PHYs with two and four channels. DSI mainly configures the timing for screen display and the function of sending commands in the software. ##### Configure display timing Each manufacturer's screen will have a set of timings used for screen control, which mainly include frame control timing and line control timing, as shown in the following figure: ![Illustration description has been automatically generated](https://kendryte-download.canaan-creative.com/developer/pictures/01cabbb3d5c1dc60d0baa95a0f87104f.png) ![Illustration, schematic description has been automatically generated](https://kendryte-download.canaan-creative.com/developer/pictures/507a7bd277508dc177ebb0c4cfb49b9e.png) These parameters will also be used in DSI, and the configuration timing can be consistent with the screen. ##### DSI command issuance Dsi needs to enter lp mode first, and then you can send commands. The required APIs are as follows: - [kd_mpi_dsi_set_attr](#kd_mpi_dsi_set_attr) - [kd_mpi_dsi_send_cmd](#kd_mpi_dsi_send_cmd) The data sent is sent according to 8 bits, and it will automatically choose to send long packets or short packets according to the quantity. ##### DSI self-test mode The DSI self-test mode will generate color bar data according to the configured dsi timing and send it out, so that it does not rely on vo to read data from ddr. The test mode is displayed as follows: ![Background pattern Medium confidence description has been automatically generated](https://kendryte-download.canaan-creative.com/developer/pictures/25246d8f3ff85d6e9b1de1b03369fbb3.png) A 24-bit interface is used between DSI and vo, so the configured color bar is the effect shown in the picture above. To use it, you only need to configure the DSI and then enable the color bar. The API is as follows - [kd_mpi_dsi_set_test_pattern](#kd_mpi_dsi_set_test_pattern) #### VO configuration VO (video output) is mainly the VO (Video Output, video output) module that actively reads video and graphics data from the corresponding location in the memory, and outputs the video and graphics through the corresponding display device. The VO part contains two configurations, one is the timing configuration, and the other is the video layer configuration. ##### VO timing configuration The timing configuration of VO uses the same configuration parameters as the timing configuration of dsi. The specific rows and columns are the same. Please refer to the introduction of dsi timing. ##### V1.2.3.2 O layer configuration The VO layer currently supports 3 layers and 4 osd layers. The Layer layer can only display the yuv image format (the functions supported by layer0 and layer1 are in the charts in [Overview](#overview)). ##### VO's writeback function configuration VO also supports the write-back function. This can verify whether the VO configuration is correct. After the VO configuration is completed, the data will be written back to ddr to facilitate verification of whether there is any abnormality in the VO configuration. #### Debugging method of VO module ##### Screen test method - You can configure the screen to enter self-test mode through the LP command to see if the generated image is normal. - Read the screen register through the LP command to see if there is a return ##### DSI test methods - After configuring the DSI, let the screen enter the self-test mode, measure the signal to see if it is normal, and you can also see if the screen produces a color bar image. - Check the err status register of phy to see if there is an err status. You can check it through proc. ##### VO test method - After the VO configuration is completed, turn on the writeback function to check whether it is consistent with the configuration requirements. - Read the err status register of DSI and check whether underflow or overflow occurs in data transmission between VO and dsi. If so, adjust the timing appropriately and try again. ## API Reference ### TXPHY This function module provides the following APIs: - [kd_mpi_set_mipi_phy_attr](#kd_mpi_set_mipi_phy_attr) #### kd_mpi_set_mipi_phy_attr Description Set the frequency of phy Syntax k_s32 kd_mpi_set_mipi_phy_attr(k_vo_mipi_phy_attr \*attr) Parameters | Parameter Name | Description | Input/Output | |----------|--------------------|-----------| | attr | Frequency structure description of Phy [k_vo_mipi_phy_attr](#k_vo_mipi_phy_attr) | Input | Return Value | Return Value | Description | |--------|--------------------| | 0 | success. | | non-0 | Failure, see error code. | Chip differences None Requirements - Header File: mpi_vo_api.h k_vo_comm.h - Library File: libvo.a Notes None Example None Related Topics None ### DSI This function module provides the following APIs: - [kd_mpi_dsi_set_attr](#kd_mpi_dsi_set_attr) - [kd_mpi_dsi_enable](#kd_mpi_dsi_enable) - [kd_mpi_dsi_send_cmd](#kd_mpi_dsi_send_cmd) - [kd_mpi_dsi_read_pkg](#kd_mpi_dsi_read_pkg) - [kd_mpi_dsi_set_test_pattern](#kd_mpi_dsi_set_test_pattern) #### kd_mpi_dsi_set_attr Description Configure dsi attribute parameters Syntax k_s32 kd_mpi_dsi_set_attr(k_display_mode \*attr) | Parameter Name | Description | Input/Output | |----------|--------------|-----------| | attr | dsi attribute parameters | Input | Return Value | Return Value | Description | |--------|--------------------| | 0 | success. | | non-0 | Failure, see error code. | Chip differences None Requirements - Header File: mpi_vo_api.h k_vo_comm.h - Library File: libvo.a Notes None Example None Related Topics None #### kd_mpi_dsi_enable Description opendsi Syntax k_s32 kd_mpi_dsi_enable(k_u32 enable) Parameters | Parameter Name | Description | Input/Output | |----------|--------------|-----------| | enable | dsi enable status (1: enable, 0: disble) | Input | Return Value | Return Value | Description | |--------|--------------------| | 0 | success. | | non-0 | Failure, see error code. | Chip differences None Requirements - Header File: mpi_vo_api.h - Library File: libvo.a Notes None Example None Related Topics None #### kd_mpi_dsi_send_cmd Description Dsi send command Syntax k_s32 kd_mpi_dsi_send_cmd(k_u8 \*data, k_s32 cmd_len) Parameters | Parameter Name | Description | Input/Output | |----------|------------|-----------| | data | data sent | Input | | cmd_len | Data length | Input | Return Value | Return Value | Description | |--------|--------------------| | 0 | success. | | non-0 | Failure, see error code. | Chip differences None Requirements - Header File: mpi_vo_api.h - Library File: libvo.a Notes None Example None Related Topics None #### kd_mpi_dsi_read_pkg Description Dsi read command Syntax k_s32 kd_mpi_dsi_read_pkg(k_u8 addr, k_u16 cmd_len, k_u32 \*rv_data) Parameters | Parameter Name | Description | Input/Output | |----------|------------|-----------| | addr | accepted data | Input | | cmd_len | Data length | Input | | rv_data | Returned data | Output | Return Value | Return Value | Description | |--------|--------------------| | 0 | success. | | non-0 | Failure, see error code. | Chip differences None Requirements - Header File: mpi_vo_api.h - Library File: libvo.a Notes None Example None Related Topics None #### kd_mpi_dsi_set_test_pattern Description Configure dsi to enter self-test mode Syntax k_s32 kd_mpi_dsi_set_test_pattern(void) 【parameter】, None Return Value | Return Value | Description | |--------|--------------------| | 0 | success. | | non-0 | Failure, see error code. | Chip differences None Requirements - Header File: mpi_vo_api.h - Library File: libvo.a Notes None Example None Related Topics None ### VO - [kd_mpi_vo_init](#kd_mpi_vo_init) - [kd_mpi_vo_set_dev_param](#kd_mpi_vo_set_dev_param) - [kd_mpi_vo_enable_video_layer](#kd_mpi_vo_enable_video_layer) - [kd_mpi_vo_disable_video_layer](#kd_mpi_vo_disable_video_layer) - [kd_mpi_vo_enable](#kd_mpi_vo_enable) - [kd_mpi_vo_chn_insert_frame](#kd_mpi_vo_chn_insert_frame) - [kd_mpi_vo_chn_dump_frame](#kd_mpi_vo_chn_dump_frame) - [kd_mpi_vo_chn_dump_release](#kd_mpi_vo_chn_dump_release) - [kd_mpi_vo_osd_enable](#kd_mpi_vo_osd_enable) - [kd_mpi_vo_osd_disable](#kd_mpi_vo_osd_disable) - [kd_mpi_vo_set_video_osd_attr](#kd_mpi_vo_set_video_osd_attr) - [kd_mpi_vo_set_wbc_attr](#kd_mpi_vo_set_wbc_attr) - [kd_mpi_vo_enable_wbc](#kd_mpi_vo_enable_wbc) - [kd_mpi_vo_disable_wbc](#kd_mpi_vo_disable_wbc) - [kd_display_reset](#kd_display_reset) - [kd_display_set_backlight](#kd_display_set_backlight) - [kd_mpi_vo_set_user_sync_info](#kd_mpi_vo_set_user_sync_info) - kd_mpi_vo_draw_frame #### kd_mpi_vo_init Description Vo initialization default parameters Syntax k_s32 kd_mpi_vo_init(void); Parameters None Return Value | Return Value | Description | |--------|--------------------| | 0 | success. | | non-0 | Failure, see error code. | Chip differences None Requirements - Header File: mpi_vo_api.h - Library File: libvo.a Notes None Example None Related Topics None #### kd_mpi_vo_set_dev_param Description Dsi send command Syntax k_s32 kd_mpi_vo_set_dev_param(k_vo_pub_attr \*attr) Parameters | Parameter Name | Description | Input/Output | |----------|----------------------------------|-----------| | attr | Video output device public attribute structure pointer. | Input | Return Value | Return Value | Description | |--------|--------------------| | 0 | success. | | non-0 | Failure, see error code. | Chip differences None Requirements - Header File: mpi_vo_api.h k_vo_comm.h - Library File: libvo.a Notes None Example None Related Topics None #### kd_mpi_vo_enable_video_layer Description Configure layer attribute parameters Syntax k_s32 kd_mpi_vo_enable_video_layer([k_vo_layer](#k_vo_layer) layer) Parameters | Parameter Name | Description | Input/Output | |----------|------------------------------------------------------|-----------| | layer | Video output video layer number value range [0 – K_MAX_VO_LAYER_NUM] | Input | Return Value | Return Value | Description | |--------|--------------------| | 0 | success. | | non-0 | Failure, see error code. | Chip differences None Requirements - Header File: mpi_vo_api.h - Library File: libvo.a Notes None Example None Related Topics None #### kd_mpi_vo_disable_video_layer Description Turn off video layer Syntax k_s32 kd_mpi_vo_disable_video_layer([k_vo_layer](#k_vo_layer) layer) Parameters | Parameter Name | Description | Input/Output | |----------|------------------------------------------------------|-----------| | layer | Video output video layer number value range [0 – K_MAX_VO_LAYER_NUM] | Input | Return Value | Return Value | Description | |--------|--------------------| | 0 | success. | | non-0 | Failure, see error code. | Chip differences None Requirements - Header File: - Library File: Notes None Example None Related Topics None #### kd_mpi_vo_enable Description openvo Syntax k_u8 kd_mpi_vo_enable(void); Parameters None Return Value | Return Value | Description | |--------|--------------------| | 0 | success. | | non-0 | Failure, see error code. | Chip differences None Requirements - Header File: - Library File: Notes None Example None Related Topics None #### kd_mpi_vo_chn_insert_frame Description Insert frames into the channel of vo Syntax k_s32 kd_mpi_vo_chn_insert_frame(k_u32 chn_num, [k_video_frame_info](#k_video_frame_info) \*vf_info) Parameters | Parameter Name | Description | Input/Output | |----------|----------------------|-----------| | chn_num | Number of channels | Input | | vf_info | The structure pointer of the video frame. | Input | Return Value | Return Value | Description | |--------|--------------------| | 0 | success. | | non-0 | Failure, see error code. | Chip differences None Requirements - Header File: mpi_vo_api.h k_video_comm.h - Library File: libvo.a Notes None Example None Related Topics None #### kd_mpi_vo_chn_dump_frame Description Grab a frame of data from the channel of vo Syntax k_s32 kd_mpi_vo_chn_dump_frame(k_u32 chn_num, [k_video_frame_info](#k_video_frame_info) \*vf_info, k_u32 timeout_ms); Parameters | Parameter Name | Description | Input/Output | |------------|--------------------|-----------| | chn_num | channel id | Input | | vf_info | Structure pointer of video frame | Input | | timeout_ms | timeout | Input | Return Value | Return Value | Description | |--------|--------------------| | 0 | success. | | non-0 | Failure, see error code. | Chip differences None Requirements - Header File: mpi_vo_api.h k_video_comm.h - Library File: libvo.a Notes None Example None Related Topics None #### kd_mpi_vo_chn_dump_release Description Release grab frame Syntax k_s32 kd_mpi_vo_chn_dump_release(k_u32 chn_num, const [k_video_frame_info](#k_video_frame_info) \*vf_info); Parameters | Parameter Name | Description | Input/Output | |----------|--------------------|-----------| | chn_num | channel id | Input | | vf_info | Structure pointer of video frame | Input | Return Value | Return Value | Description | |--------|--------------------| | 0 | success. | | non-0 | Failure, see error code. | Chip differences None Requirements - Header File: mpi_vo_api.h k_video_comm.h - Library File: libvo.a Notes None Example None Related Topics None #### kd_mpi_vo_osd_enable Description Open the osd layer Syntax k_s32 kd_mpi_vo_osd_enable([k_vo_osd](#k_vo_osd) layer) Parameters | Parameter Name | Description | Input/Output | |----------|----------------------------------------------------|-----------| | layer | Video output video layer number value range [0 – K_MAX_VO_OSD_NUM] | Input | Return Value | Return Value | Description | |--------|--------------------| | 0 | success. | | non-0 | Failure, see error code. | Chip differences None Requirements - Header File: mpi_vo_api.h k_vo_comm.h - Library File: libvo.a Notes None Example None Related Topics None #### kd_mpi_vo_osd_disable Description Close osd layer Syntax k_s32 kd_mpi_vo_osd_disable([k_vo_osd](#k_vo_osd) layer) Parameters | Parameter Name | Description | Input/Output | |----------|----------------------------------------------------|-----------| | layer | Video output video layer number value range [0 – K_MAX_VO_OSD_NUM] | Input | Return Value | Return Value | Description | |--------|--------------------| | 0 | success. | | non-0 | Failure, see error code. | Chip differences None Requirements - Header File: mpi_vo_api.h k_vo_comm.h - Library File: libvo.a Notes None Example None Related Topics None #### kd_mpi_vo_set_video_osd_attr Description Set osd layer properties Syntax k_s32 kd_mpi_vo_set_video_osd_attr([k_vo_osd](#k_vo_osd) layer, [k_vo_video_osd_attr](#k_vo_video_osd_attr) \*attr) Parameters | Parameter Name | Description | Input/Output | |----------------|----------------------------------------------------|-----------| | layer | Video output video layer number value range [0 – K_MAX_VO_OSD_NUM] | Input | | osd layer attribute parameters | osd layer attribute parameters | Input | Return Value | Return Value | Description | |--------|--------------------| | 0 | success. | | non-0 | Failure, see error code. | Chip differences None Requirements - Header File: mpi_vo_api.h k_vo_comm.h - Library File: libvo.a Notes None Example None Related Topics None #### kd_mpi_vo_set_wbc_attr Description Set writeback properties Syntax k_s32 kd_mpi_vo_set_wbc_attr([k_vo_wbc_attr](#k_vo_wbc_attr) \*attr) Parameters | Parameter Name | Description | Input/Output | |----------|--------------------|-----------| | attr | writeback attribute parameter | Input | Return Value | Return Value | Description | |--------|--------------------| | 0 | success. | | non-0 | Failure, see error code. | Chip differences None Requirements - Header File: mpi_vo_api.h k_vo_comm.h - Library File: libvo.a Notes None Example None Related Topics None #### kd_mpi_vo_enable_wbc Description enable writeback Syntax k_s32 kd_mpi_vo_enable_wbc(void) Parameters None Return Value | Return Value | Description | |--------|--------------------| | 0 | success. | | non-0 | Failure, see error code. | Chip differences None Requirements - Header File: mpi_vo_api.h k_vo_comm.h - Library File: libvo.a Notes None Example None Related Topics None #### kd_mpi_vo_disable_wbc Description Close writeback Syntax k_s32 kd_mpi_vo_disable_wbc(void) Parameters None Return Value | Return Value | Description | |--------|--------------------| | 0 | success. | | non-0 | Failure, see error code. | Chip differences None Requirements - Header File: mpi_vo_api.h k_vo_comm.h - Library File: libvo.a Notes None Example None Related Topics None #### kd_display_reset Description Reset the video output subsystem Syntax k_s32 kd_display_reset(void) Parameters None Return Value | Return Value | Description | |--------|--------------------| | 0 | success. | | non-0 | Failure, see error code. | Chip differences None Requirements - Header File: mpi_vo_api.h k_vo_comm.h - Library File: libvo.a Notes None Example None Related Topics None #### kd_display_set_backlight Description Reset screen and turn on backlight Syntax k_s32 kd_display_set_backlight(void) Parameters None Return Value | Return Value | Description | |--------|--------------------| | 0 | success. | | non-0 | Failure, see error code. | Chip differences None Requirements - Header File: mpi_vo_api.h k_vo_comm.h - Library File: libvo.a Notes None Example None Related Topics None #### kd_mpi_vo_set_user_sync_info Description Set user interface timing information for configuring clock source, clock size, and clock division ratio Syntax k_s32 kd_mpi_vo_set_user_sync_info(k_u32 pre_div,k_u32 clk_en) Parameters | Parameter Name | Description | Input/Output | | -------- | --------------- | --------- | | pre_div | User frequency division number | Input | | clk_en | Frequency division enable enable | Input | Return Value | Return Value | Description | |--------|--------------------| | 0 | success. | | non-0 | Failure, see error code. | Chip differences None Requirements - Header File: mpi_vo_api.h k_vo_comm.h - Library File: libvo.a Notes None Example None Related Topics None #### kd_mpi_vo_draw_frame Description picture frame Syntax k_s32 kd_mpi_vo_draw_frame([k_vo_draw_frame](#k_vo_draw_frame) \*frame) Parameters | Parameter Name | Description | Input/Output | |----------|----------------|-----------| | frame | Frame property parameters | Input | Return Value | Return Value | Description | |--------|--------------------| | 0 | success. | | non-0 | Failure, see error code. | Chip differences None Requirements - Header File: mpi_vo_api.h k_vo_comm.h - Library File: libvo.a Notes None Example None Related Topics None #### kd_mpi_get_connector_info Description Get the data structure of the connecor connector through the connection type Syntax k_s32 kd_mpi_get_connector_info([k_connector_type](#k_connector_type) connector_type, [k_connector_info](#k_connector_info) \*connector_info) Parameters | Parameter Name | Description | Input/Output | |----------------|----------------|-----------| | connector_type | Connector type | Input | | connector_info | Connector data structure | Input | Return Value | Return Value | Description | |--------|--------------------| | 0 | success. | | non-0 | Failure, see error code. | Chip differences None Requirements - Header File: mpi_vo_api.h k_vo_comm.h k_connector_comm.h - Library File: libvo.a libconnector.a Notes None Example None Related Topics None #### kd_mpi_connector_open Description Get the data structure of the connecor connector through the connection type Syntax k_s32 kd_mpi_connector_open(const char \*connector_name) Parameters | Parameter Name | Description | Input/Output | |----------------|----------------|-----------| | connector_name | Device node for the connector | Input | Return Value | Return Value | Description | |--------|--------------------| | fd | Successfully returns the id of the open fd | | less than 0 | Failure, see error code. | Chip differences None Requirements - Header File: mpi_vo_api.h k_vo_comm.h k_connector_comm.h - Library File: libvo.a libconnector.a Notes None Example None Related Topics None #### kd_mpi_connector_power_set Description Turn on the power of the connector Syntax k_s32 kd_mpi_connector_power_set(k_s32 fd, k_bool on) Parameters | Parameter Name | Description | Input/Output | |----------------|----------------|-----------| | fd | Device node for the connector | Input | | on | Connector device switch | Input | Return Value | Return Value | Description | |--------|--------------------| | 0 | success. | | non-0 | Failure, see error code. | Chip differences None Requirements - Header File: mpi_vo_api.h k_vo_comm.h k_connector_comm.h - Library File: libvo.a libconnector.a Notes None Example None Related Topics None #### kd_mpi_connector_init Description vo connector initialization Syntax k_s32 kd_mpi_connector_init(k_s32 fd, [k_connector_info](#k_connector_info) info) Parameters | Parameter Name | Description | Input/Output | |----------------|----------------|-----------| | fd | Device node for the connector | Input | | info | Connector initialization parameters | Input | Return Value | Return Value | Description | |--------|--------------------| | 0 | success. | | non-0 | Failure, see error code. | Chip differences None Requirements - Header File: mpi_vo_api.h k_vo_comm.h k_connector_comm.h - Library File: libvo.a libconnector.a Notes None Example None Related Topics None #### kd_mpi_connector_get_negotiated_data Description The Display driver and the monitor automatically negotiate the resolution. After the negotiation is successful, the negotiated data will be saved to the negotiated_data variable. Syntax k_s32 kd_mpi_connector_get_negotiated_data(k_s32 fd, [k_connector_negotiated_data](#k_connector_negotiated_data) *negotiated_data); Parameters | Parameter Name | Description | Input/Output | | ----------------|----------------|-----------| | fd | file descriptor | Input | | negotiated_data | Data negotiated between Display driver and HDMI display | Input | Return Value | Return Value | Description | |--------|--------------------| | >= 1 | Success, the number of resolutions supported by the Display driver after adaptation is successful | | -1 | Failure, see error code | Chip differences None Requirements - Header File: mpi_vo_api.h k_vo_comm.h k_connector_comm.h - Library File: libvo.a libconnector.a Notes kd_mpi_connector_get_negotiated_data() will only negotiate with the display. After successful negotiation, the best resolution will not be set to the VO, DSI, and HDMI modules. Example None Related Topics None #### kd_mpi_connector_adapt_resolution Description The Display driver and the monitor automatically negotiate the resolution. After successful negotiation, the negotiated data will be saved to the negotiated_data variable, and the best resolution will be set to the VO, DSI, and HDMI modules. Syntax k_s32 kd_mpi_connector_adapt_resolution(k_connector_type type, [k_connector_negotiated_data](#k_connector_negotiated_data) *negotiated_data) Parameters | Parameter Name | Description | Input/Output | | ----------------|----------------|-----------| | type | Device node of the connector, HDMI interface is usually set to LT9611_MIPI_ADAPT_RESOLUTION | Input | | negotiated_data | Data negotiated between Display driver and HDMI display | Input | Return Value | Return Value | Description | |--------|--------------------| | 0 | Success | | -1 | Failure, see error code | Chip differences None Requirements - Header File: mpi_vo_api.h k_vo_comm.h k_connector_comm.h - Library File: libvo.a libconnector.a Notes 1 kd_mpi_connector_adapt_resolution() internally negotiates with the display by calling kd_mpi_connector_get_negotiated_data() 2 After the application calls the kd_mpi_connector_adapt_resolution() function to complete the adaptive setting, it can still call kd_mpi_get_connector_info(), kd_mpi_connector_open(), kd_mpi_connector_power_set(), kd_mpi_connector_init() reset the output resolution Example None Related Topics None #### kd_mpi_connector_set_mirror Description Set screen mirror function Syntax k_s32 kd_mpi_connector_set_mirror(k_s32 fd, k_connector_mirror mirror) Parameters | Parameter Name | Description | Input/Output | | ----------------|----------------|-----------| | fd | file descriptor | Input | | mirror | Screen mirror function | Input | Return Value | Return Value | Description | |--------|--------------------| | 0 | Success | | -1 | Failure, see error code | Chip differences None Requirements - Header File: mpi_vo_api.h k_vo_comm.h k_connector_comm.h - Library File: libvo.a libconnector.a Notes 1 kd_mpi_connector_adapt_resolution() internally negotiates with the display by calling kd_mpi_connector_get_negotiated_data() 2 After the application calls the kd_mpi_connector_adapt_resolution() function to complete the adaptive setting, it can still call kd_mpi_get_connector_info(), kd_mpi_connector_open(), kd_mpi_connector_power_set(), kd_mpi_connector_init() reset the output resolution Example None Related Topics None ## data type ### VO #### k_vo_intf_sync Description Define resolution and frame rate in video definition typedef enum {  K_VO_OUT_1080P30,  K_VO_OUT_1080P60, } k_vo_intf_sync; member | member name | Description | |------------------------|------------------------------------------------| | K_VO_OUT_1080P30 | 1080 means 1920x1080 pixels. 30 means 30fps | | K_VO_OUT_1080P60 | 1080 means 1920x1080 pixels. 60 means 60fps | | K_VO_OUT_1080x1920P30 | 1080x1920 means 1080x1920 pix. 30 means 30fps | | K_VO_OUT_11080x1920P60 | 1080x1920 means 1080x1920 pix. 60 means 60fps | Notes None Related Data Types and Interfaces #### k_vo_intf_type Description Define resolution and frame rate in video definition typedef enum {  K_VO_INTF_MIPI = 0, } k_vo_intf_type; member | member name | Description | |----------------|-----------| | K_VO_INTF_MIPI | MIPI interface | Notes None Related Data Types and Interfaces #### k_pixel_format Description The data formats supported by the layer in the display. The structure below only lists the data formats supported by the display, not all data formats. definition typedef enum { PIXEL_FORMAT_RGB_444 = 0, PIXEL_FORMAT_RGB_555, PIXEL_FORMAT_RGB_565, PIXEL_FORMAT_RGB_888, PIXEL_FORMAT_BGR_444, PIXEL_FORMAT_BGR_555, PIXEL_FORMAT_BGR_565, PIXEL_FORMAT_BGR_888, PIXEL_FORMAT_ARGB_1555, PIXEL_FORMAT_ARGB_4444, PIXEL_FORMAT_ARGB_8565, PIXEL_FORMAT_ARGB_8888, PIXEL_FORMAT_ARGB_2BPP, PIXEL_FORMAT_ABGR_1555, PIXEL_FORMAT_ABGR_4444, PIXEL_FORMAT_ABGR_8565, PIXEL_FORMAT_ABGR_8888, PIXEL_FORMAT_BGRA_8888, PIXEL_FORMAT_RGB_MONOCHROME_8BPP, PIXEL_FORMAT_RGB_BAYER_8BPP, PIXEL_FORMAT_RGB_BAYER_10BPP, PIXEL_FORMAT_RGB_BAYER_12BPP, PIXEL_FORMAT_RGB_BAYER_14BPP, PIXEL_FORMAT_RGB_BAYER_16BPP, PIXEL_FORMAT_YVU_PLANAR_422, PIXEL_FORMAT_YVU_PLANAR_420, PIXEL_FORMAT_YVU_PLANAR_444, PIXEL_FORMAT_YVU_SEMIPLANAR_422, PIXEL_FORMAT_YVU_SEMIPLANAR_420, PIXEL_FORMAT_YVU_SEMIPLANAR_444, PIXEL_FORMAT_YUV_SEMIPLANAR_422, PIXEL_FORMAT_YUV_SEMIPLANAR_420, PIXEL_FORMAT_YUV_SEMIPLANAR_444, PIXEL_FORMAT_YUYV_PACKAGE_422, PIXEL_FORMAT_YVYU_PACKAGE_422, PIXEL_FORMAT_UYVY_PACKAGE_422, PIXEL_FORMAT_VYUY_PACKAGE_422, PIXEL_FORMAT_YYUV_PACKAGE_422, PIXEL_FORMAT_YYVU_PACKAGE_422, PIXEL_FORMAT_UVYY_PACKAGE_422, PIXEL_FORMAT_VUYY_PACKAGE_422, PIXEL_FORMAT_VY1UY0_PACKAGE_422, PIXEL_FORMAT_YUV_PACKAGE_444, PIXEL_FORMAT_YUV_400, PIXEL_FORMAT_UV_420, PIXEL_FORMAT_BGR_888_PLANAR, PIXEL_FORMAT_RGB_888_PLANAR, PIXEL_FORMAT_HSV_888_PACKAGE, PIXEL_FORMAT_HSV_888_PLANAR, PIXEL_FORMAT_LAB_888_PACKAGE, PIXEL_FORMAT_LAB_888_PLANAR, PIXEL_FORMAT_S8C1, PIXEL_FORMAT_S8C2_PACKAGE, PIXEL_FORMAT_S8C2_PLANAR, PIXEL_FORMAT_S8C3_PLANAR, PIXEL_FORMAT_S16C1, PIXEL_FORMAT_U8C1, PIXEL_FORMAT_U16C1, PIXEL_FORMAT_S32C1, PIXEL_FORMAT_U32C1, PIXEL_FORMAT_U64C1, PIXEL_FORMAT_S64C1, PIXEL_FORMAT_RGB_565_LE = 300, PIXEL_FORMAT_BGR_565_LE, PIXEL_FORMAT_BUTT } k_pixel_format; member | member name | Description | |----------------------------------|-------------| | PIXEL_FORMAT_YVU_PLANAR_420 | YUV420 NV12 | | PIXEL_FORMAT_YVU_PLANAR_422 | YUV422 NV16 | | PIXEL_FORMAT_RGB_565 | RGB565 | | PIXEL_FORMAT_RGB_888 | RGB888 | | PIXEL_FORMAT_RGB_MONOCHROME_8BPP | 8 BIT RGB | | PIXEL_FORMAT_ARGB_8888 | ARGB8888 | | PIXEL_FORMAT_ARGB_4444 | ARGB4444 | | PIXEL_FORMAT_ARGB_1555 | ARGB1444 | Notes None Related Data Types and Interfaces None #### k_vo_osd Description The number of OSDs and the number of each OSD definition typedef enum {  K_VO_OSD0,  K_VO_OSD1,  K_VO_OSD2,  K_VO_OSD3,  K_MAX_VO_OSD_NUM, } k_vo_osd; member | member name | Description | |------------------|---------------------| | K_VO_OSD0 | Layer 0 osd | | K_VO_OSD1 | layer 1 osd | | K_VO_OSD2 | layer 2 osd | | K_VO_OSD3 | layer 3 osd | | K_MAX_VO_OSD_NUM | Osd layer maximum number flag | Notes None Related Data Types and Interfaces None #### k_vo_layer Description The number of layers and the number of each layer definition typedef enum {  K_VO_LYAER0 = 0,  K_VO_LYAER1,  K_VO_LYAER2,  K_MAX_VO_LAYER_NUM, } k_vo_layer; member】 | member name | Description | |--------------------|-----------------------| | K_VO_LYAER0 | Layer 0 | | K_VO_LYAER1 | layer 1 | | K_VO_LYAER2 | Layer 2 | | K_VO_LYAER3 | layer 3 | | K_MAX_VO_LAYER_NUM | layer maximum number of layers flag | Notes None Related Data Types and Interfaces None #### k_vo_rotation Description Layer rotation supported functions definition typedef enum {  K_ROTATION_0 = (0x01L \<\< 0),  K_ROTATION_90 = (0x01L \<\< 1),  K_ROTATION_180 = (0x01L \<\< 2),  K_ROTATION_270 = (0x01L \<\< 3), } k_vo_rotation; Notes None Related Data Types and Interfaces None #### k_vo_mirror_mode Description Features supported by Layer mirror. definition typedef enum {  K_VO_MIRROR_NONE = (0x01L \<\< 4),  K_VO_MIRROR_HOR = (0x01L \<\< 5),  K_VO_MIRROR_VER = (0x01L \<\< 6),  K_VO_MIRROR_BOTH = (0x01L \<\< 7), } k_vo_mirror_mode; member | member name | Description | |------------------|-------------------------| | K_VO_MIRROR_NONE | Layer does not mirror | | K_VO_MIRROR_HOR | Layer only does horizontal mirror | | K_VO_MIRROR_VER | Layer only does vertical mirror | | K_VO_MIRROR_BOTH | Layer does vertical and horizontal mirror | Notes None Related Data Types and Interfaces None #### k_vo_user_sync_info Description User-defined clock frequency division. definition typedef struct { k_u32 pre_div; k_u32 clk_en; } k_vo_user_sync_info; member | member name | Description | |----------|------------------| | pre_div | Clkext frequency division | | clk_en | Display clock enable | Notes None Related Data Types and Interfaces None #### k_vo_point Description Define the coordinate information structure. definition typedef struct {  k_u32 x;  k_u32 y; }k_vo_point; member | member name | Description | |----------|--------| | x | abscissa | | y | vertical coordinate | Notes None Related Data Types and Interfaces None #### k_vo_size Description Define the size information structure. definition typedef struct {  k_u32 width;  k_u32 height; } k_vo_size; member | member name | Description | |----------|------| | width | width | | height | high | Notes None Related Data Types and Interfaces None #### k_vo_video_layer_attr Description Define display layer layer properties definition typedef struct { k_vo_point display_rect; k_vo_size img_size; k_pixel_format pixel_format; k_u32 stride; k_u32 func; k_vo_scaler_attr scaler_attr; } k_vo_video_layer_attr; member | member name | Description | |---------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------| | display_rect; | The starting position of the OSD layer | | img_size | Image resolution structure, that is, the size of the composite picture | | pixel_format | Data formats supported by the video layer | | stride | image stride | | func | Set the rotation angle (0, 90, 180, 270) | | scaler_attr | Zoom settings | Notes alptha_tpye is only used for osd layer Related Data Types and Interfaces None #### k_vo_wbc_attr Description Define the writeback attribute. definition typedef struct {  [k_vo_size](#k_vo_size) target_size;  [k_pixel_format](#k_pixel_format) pixel_format;  k_u32 stride;  k_u32 y_phy_addr; } k_vo_wbc_attr; member | member name | Description | |---------------|------------| | target_size | Target size for writeback | | pixel_format | Write-back data format | | stride; | write-back stride | | y_addr | Physical address of image writeback | Notes y_addr needs to allocate space Related Data Types and Interfaces None #### k_vo_pub_attr Description Configure the public properties of the video output device. definition typedef struct {  k_u32 bg_color;  [k_vo_intf_type](#k_vo_intf_type) intf_type;  [k_vo_intf_sync](#k_vo_intf_sync) intf_sync;  [k_vo_display_resolution](#k_vo_display_resolution) \*sync_info;  }k_vo_pub_attr; member | | | |-----------|--------------------------| | member name | Description | | bg_color | background color | | type | Interface type, currently only supports mipi | | intf_sync | Resolution and frame rate in video | | sync_info | Image output timing | Notes None Related Data Types and Interfaces None #### k_vo_scaler_attr Description Define the scaler attribute definition typedef struct{  k_size out_size;  k_u32 stride; }k_vo_scaler_attr; member | member name | Description | |----------|--------------------| | out_size | Output size | | stride | Input stride | Notes None Related Data Types and Interfaces None #### k_vo_draw_frame Description Define the properties of the frame definition typedef struct {  k_u32 draw_en;  k_u32 line_x_start;  k_u32 line_y_start;  k_u32 line_x_end;  k_u32 line_y_end;  k_u32 frame_num; }k_vo_draw_frame; member | member name | Description | |--------------|--------------------------| | draw_en | Picture frame enable | | line_x_start | Start of X direction | | line_y_start | Start of y direction | | line_x_end | End point in X direction | | line_y_end | end point in y direction | | frame_num | The num number of the current frame [0 - 16] | Notes None Related Data Types and Interfaces None #### k_vo_display_resolution Description Display timing attribute. definition typedef struct{  k_u32 pclk;  k_u32 phyclk;  k_u32 htotal;  k_u32 hdisplay;  k_u32 hsync_len;  k_u32 hback_porch;  k_u32 hfront_porch;  k_u32 vtotal;  k_u32 vdisplay;  k_u32 vsync_len;  k_u32 vback_porch;  k_u32 vfront_porch; } k_vo_display_resolution; member | member name | Description | |--------------|--------------------| | pclk | Vo's pix clk frequency | | phyclk | frequency of d-phy | | htotal | Total pixels in a row | | hdisplay | The effective number of pixels in a row | | hsync_len | Number of pixels for row synchronization | | hback_porch | The number of pixels in the back shoulder | | hfront_porch | The number of pixels on the front shoulder | | vtotal | Total number of rows | | vdisplay | The number of valid lines in one frame | | vsync_len | Number of pixels for frame synchronization | | vback_porch | Number of rows of back shoulder | | vfront_porch | Number of rows of front shoulder | Notes None Related Data Types and Interfaces None #### k_vo_mipi_phy_attr Description Structure defining mipi phy frequency definition typedef struct { k_u32 n; k_u32 m; k_u32 voc; k_u32 phy_lan_num; k_u32 hs_freq; } k_vo_mipi_phy_attr; member | member name | Description | |-------------|----------------| | n | Pll coefficient | | m | Pll coefficient | | voc | Pll coefficient | | phy_lan_num | Phy lan quantity | | hs_freq | Frequency range of Phy | Notes None Related Data Types and Interfaces None #### k_vo_video_osd_attr Description Configure the public properties of the osd layer. definition typedef struct {  [k_vo_point](#k_vo_size) display_rect;  [k_vo_size](#k_vo_size) img_size;  [k_pixel_format](#k_pixel_format) pixel_format;  k_u32 stride;  k_u8 global_alptha; } k_vo_video_osd_attr; member | member name | Description | |---------------|------------| | display_rect | location information | | img_size | effective size | | pixel_format | Data format | | stride; | Stride | | global_alptha | transparency | Notes None Related Data Types and Interfaces None #### k_video_frame_info Description One frame of information. definition typedef struct {  k_video_frame v_frame;  k_u32 pool_id;  k_mod_id mod_id; } k_video_frame_info; member | member name | Description | |----------|-------------| | v_frame | frame information | | pool_id | VB pool ID | | mod_id | Video frame id | Notes None Related Data Types and Interfaces None #### k_connector_type Description Type of connected screen (since the number of supported screens will be increased, please refer to the latest definition in the SDK). definition typedef enum {  HX8377_V2_MIPI_4LAN_1080X1920_30FPS;  LT9611_MIPI_4LAN_1920X1080_60FPS;  LT9611_MIPI_4LAN_1920X1080_30FPS; } k_connector_type; member | member name | Description | |----------|-----------------------------------------------| | v_frame | frame information | | HX8377_V2_MIPI_4LAN_1080X1920_30FPS | hx8377 screen initialization | | LT9611_MIPI_4LAN_1920X1080_60FPS | hdmi 1080p60 initialization | | LT9611_MIPI_4LAN_1920X1080_30FPS | hdmi 1080p30 initialization | Notes None Related Data Types and Interfaces None #### k_dsi_lan_num Description Number of lanes for dsi. definition typedef enum {  K_DSI_1LAN = 0,  K_DSI_2LAN = 1,  K_DSI_4LAN = 3, } k_dsi_lan_num; member | member name | Description | |----------|-------------| | K_DSI_1LAN | 1 line mode | | K_DSI_2LAN | 2-wire mode | | K_DSI_4LAN | 4-wire mode | Notes None Related Data Types and Interfaces None #### k_dsi_work_mode Description dsi working mode definition typedef enum{  K_BURST_MODE = 0,  K_NON_BURST_MODE_WITH_SYNC_EVENT = 1,  K_NON_BURST_MODE_WITH_PULSES = 2, } k_dsi_work_mode; member | member name | Description | |----------|-------------| | K_BURST_MODE | dsi works in brutal mode | | K_NON_BURST_MODE_WITH_SYNC_EVENT | dsi works in non brust event mode | | K_NON_BURST_MODE_WITH_PULSES | dsi works in non brust pulses mode | Notes None Related Data Types and Interfaces None #### k_vo_dsi_cmd_mode Description dsi mode for sending commands. definition typedef enum {  K_VO_LP_MODE,  K_VO_HS_MODE, } k_vo_dsi_cmd_mode; member | member name | Description | |----------|-------------| | K_VO_LP_MODE | Send command in lp mode | | K_VO_HS_MODE | Send command in hs mode | Notes None Related Data Types and Interfaces None #### k_connectori_phy_attr Description connector connector configures phy information. definition typedef struct {  k_u32 n;  k_u32 m;  k_u32 voc;  k_u32 hs_freq; } k_connectori_phy_attr; member | member name | Description | |----------|-------------| | n | Pll coefficient | | m | Pll coefficient | | voc | Pll coefficient | | hs_freq | Frequency range of Phy | Notes None Related Data Types and Interfaces None #### k_connector_info Description Connector information. definition typedef struct {  const char *connector_name;  k_u32 screen_test_mode;  k_u32 dsi_test_mode;  k_u32 bg_color;  k_u32 intr_line;  k_u32 pixclk_div;  [k_dsi_lan_num](#k_dsi_lan_num) lan_num;  [k_dsi_work_mode](#k_dsi_work_mode) work_mode;  [k_vo_dsi_cmd_mode](#k_vo_dsi_cmd_mode) cmd_mode;  [k_connectori_phy_attr](#k_connectori_phy_attr) phy_attr;  [k_vo_display_resolution](#k_vo_display_resolution) resolution;  [k_connector_type](#k_connector_type) type; } k_connector_info; member | member name | Description | |----------|-------------| | connector_name | Device node for the connector | | screen_test_mode | screen test mode | | dsi_test_mode | DSI test mode | | bg_color | background color | | intr_line | Screen line count | | pixclk_div | Clock divider | | lan_num | Lan mode settings: 1LAN, 2LAN, 4LAN | | work_mode | working mode | | cmd_mode | command mode | | phy_attr | Displayed physical address | | resolution | resolution | | k_connector_info | Current connector information | Notes None Related Data Types and Interfaces None #### k_connector_negotiated_data Description Data negotiated between Display driver and HDMI display definition typedef struct {  k_u32 connection_status;  k_u32 negotiated_count;  k_connector_type negotiated_types[256]; } k_connector_negotiated_data; member | member name | Description | | --- | --- | | connection_status | HDMI interface connection status | | negotiated_count | After negotiation between the Display driver and the HDMI display, the number of resolutions supported by the Display driver | | negotiated_types[256] | After negotiation between the Display driver and the HDMI display, the list of resolutions supported by the Display driver, negotiated_types[0] indicates the best resolution | Notes None Related Data Types and Interfaces None #### k_connector_mirror Description Mirror function of Display driver definition typedef enum {  K_CONNECTOR_MIRROR_HOR = 1,  K_CONNECTOR_MIRROR_VER,  K_CONNECTOR_MIRROR_BOTH, }k_connector_mirror; member | member name | Description | | --- | --- | | K_CONNECTOR_MIRROR_HOR | horizontal mirror | | K_CONNECTOR_MIRROR_VER | vertical mirror | | K_CONNECTOR_MIRROR_BOTH | Mirror both horizontally and vertically | Notes None Related Data Types and Interfaces None ## error code Table 41 VO API error codes | error code | Macro definition | Description | |------------|------------------------|----------------| | 0xa00b8006 | K_ERR_VO_NULL_PTR | Parameter null pointer error | | 0xa00b8001 | K_ERR_VO_INVALID_DEVID | Invalid dev id | | 0xa00b8002 | K_ERR_VO_INVALID_CHNID | Invalid chn id | | 0xa00b8005 | K_ERR_VO_UNEXIST | Video cache does not exist | | 0xa00b8004 | K_ERR_VO_EXIST | Video cache exists | | 0xa00b8003 | K_ERR_VO_ILLEGAL_PARAM | Parameter setting is invalid | | 0xa00b8010 | K_ERR_VO_NOTREADY | vo is not ready yet | | 0xa00b8012 | K_ERR_VO_BUSY | System is busy | | 0xa00b8007 | K_ERR_VO_NOT_CONFIG | Configuration not allowed | | 0xa00b8008 | K_ERR_VO_NOT_SUPPORT | Unsupported operation | | 0xa00b8009 | K_ERR_VO_NOT_PERM | Operation not allowed | | 0xa00b800c | K_ERR_VO_NOMEM | Failed to allocate memory | | 0xa00b800d | K_ERR_VO_NOBUF | no buff | | 0xa00b800e | K_ERR_VO_BUF_EMPTY | Buf is empty | | 0xa00b800f | K_ERR_VO_BUF_FULL | Buf is full | | 0xa00b8011 | K_ERR_VO_BADADDR | wrong address | | 0xa00b8012 | K_ERR_VO_BUSY | System is busy |