DSI
DSI (MIPI DSI) 模块支持1-lane或者2-lane的DSI屏幕, 目前带宽支持240/288/336/384/480Mbps几种配置, 标准参考MIPI协议版本V1.1(55x不支持Video模式)
支持的颜色输出格式
RGB565 DSI送数时顺序：[G3~G5R0~R4][B0~B4G0~G2]RGB888 DSI送数时顺序：[R0~R7][G0~G7][B0~B7]RGB565_SWAP DSI送数时顺序(55X 不支持)：[B0~B4G0~G2][G3~G5R0~R4]
DSI 模块可以独立工作, 但是通过LCDC封装的接口来操作可以达到最优性能。
备注
在55x上 DSI需要分多次才能完成整个屏幕的刷新动作，每次刷新2N行(视刷新区域大小，N会不同), 直到完成整个屏幕的刷新
使用DSI示例
通过LCDC接口打开DSI屏幕，然后画一个100x100的矩形区域到LCD的操作:
static LCDC_HandleTypeDef hlcdc_rm69090;
/*DSI LCD configuration*/
static const LCDC_InitTypeDef lcdc_int_cfg =
{
.lcd_itf = LCDC_INTF_DSI, //LCDC output interface
.freq = DSI_FREQ_288MHZ, //DSI clk lane freqence(DDR freqence)
.color_mode = LCDC_PIXEL_FORMAT_RGB888, //LCDC DBI output color format, should match with CmdCfg.ColorCoding below
.cfg = {
.dsi = {
.Init = {
.AutomaticClockLaneControl = DSI_AUTO_CLK_LANE_CTRL_DISABLE, //Auto gate clock to save power
.NumberOfLanes = DSI_TWO_DATA_LANES, //Numbers of data-lane
.TXEscapeCkdiv = 0x2, //Escape clk = lcdc_int_cfg_dsi.freq / 2 / 8 / TXEscapeCkdiv
},
.CmdCfg = {
.VirtualChannelID = 0, //Fixed 0, DBI virtual channel id
.CommandSize = 0xFFFF, //Maximum write bytes of every partial write
.TEAcknowledgeRequest = DSI_TE_ACKNOWLEDGE_ENABLE, //Open or Close TE
.ColorCoding = DSI_RGB888, //DSI-DBI input color format and DSI output format
},
.PhyTimings = { /*DSI PHY config */
.ClockLaneHS2LPTime = 35, /* The maximum time that the D-PHY clock lane takes to go from high-speed
to low-power transmission */
.ClockLaneLP2HSTime = 35, /* The maximum time that the D-PHY clock lane takes to go from low-power
to high-speed transmission */
.DataLaneHS2LPTime = 35, /* The maximum time that the D-PHY data lanes takes to go from high-speed
to low-power transmission */
.DataLaneLP2HSTime = 35, /* The maximum time that the D-PHY data lanes takes to go from low-power
to high-speed transmission */
.DataLaneMaxReadTime = 0, /* The maximum time required to perform a read command */
.StopWaitTime = 10, /* The minimum wait period to request a High-Speed transmission after the
Stop state */
},
.HostTimeouts = {
.TimeoutCkdiv = 1, //Timeout clk = lcdc_int_cfg_dsi.freq / 2 / 8 / TimeoutCkdiv
.HighSpeedTransmissionTimeout = 0,
.LowPowerReceptionTimeout = 0,
.HighSpeedReadTimeout = 0,
.LowPowerReadTimeout = 0,
.HighSpeedWriteTimeout = 0,
//.HighSpeedWritePrespMode = DSI_HS_PM_DISABLE,
.LowPowerWriteTimeout = 0,
.BTATimeout = 0,
},
.LPCmd = {
.LPGenShortWriteNoP = DSI_LP_GSW0P_ENABLE, //Generic short write 0 parameter use LP mode
.LPGenShortWriteOneP = DSI_LP_GSW1P_ENABLE, //Generic short write 1 parameter use LP mode
.LPGenShortWriteTwoP = DSI_LP_GSW2P_ENABLE, //Generic short write 2 parameter use LP mode
.LPGenShortReadNoP = DSI_LP_GSR0P_ENABLE, //Generic short read 0 parameter use LP mode
.LPGenShortReadOneP = DSI_LP_GSR1P_ENABLE, //Generic short read 0 parameter use LP mode
.LPGenShortReadTwoP = DSI_LP_GSR2P_ENABLE, //Generic short read 0 parameter use LP mode
.LPGenLongWrite = DSI_LP_GLW_ENABLE, //Generic long write use LP mode
.LPDcsShortWriteNoP = DSI_LP_DSW0P_ENABLE, //Dcs short write 0 parameter use LP mode
.LPDcsShortWriteOneP = DSI_LP_DSW1P_ENABLE, //Dcs short write 1 parameter use LP mode
.LPDcsShortReadNoP = DSI_LP_DSR0P_ENABLE, //Dcs short read 0 parameter use LP mode
.LPDcsLongWrite = DSI_LP_DLW_DISABLE, //Dcs long write use HS mode
.LPMaxReadPacket = DSI_LP_MRDP_ENABLE, //Maximum Read Packet Size
.AcknowledgeRequest = DSI_ACKNOWLEDGE_DISABLE, //Request acknowledge
},
.vsyn_delay_us = 1000, //The delay during receive TE and send framebuffer. If TE was disable ignore it.
},
},
};
/**********************
* FUNCTIONS
**********************/
__ROM_USED void LCDC1_IRQHandler(void)
{
/* enter interrupt */
ENTER_INTERRUPT();
HAL_LCDC_IRQHandler(&hlcdc_rm69090);
/* leave interrupt */
LEAVE_INTERRUPT();
}
void HAL_LCDC_SendLayerDataCpltCbk(LCDC_HandleTypeDef *lcdc)
{
LOG_I("Send layer buffer done.");
}
/*
RM69090 initialization sequence
*/
static void RM69090_Init_Seq(LCDC_HandleTypeDef *hlcdc)
{
...
//Sleep out
HAL_LCDC_WriteU8Reg(hlcdc, 0x11, (uint8_t *)NULL, 0);
/* Wait for 150ms */
HAL_Delay(150);
/* Display On */
HAL_LCDC_WriteU8Reg(hlcdc, 0x29, (uint8_t *)NULL, 0);
/* Wait for 150ms */
HAL_Delay(150);
...
}
/*Set LCD receive area*/
void RM69090_SetRegion(LCDC_HandleTypeDef *hlcdc, uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1)
{
uint8_t parameter[4];
parameter[0] = (x0) >> 8;
parameter[1] = (x0) & 0xFF;
parameter[2] = (x1) >> 8;
parameter[3] = (x1) & 0xFF;
HAL_LCDC_WriteU8Reg(hlcdc, 0x2a, parameter, 4);
parameter[0] = (y0) >> 8;
parameter[1] = (y0) & 0xFF;
parameter[2] = (y1) >> 8;
parameter[3] = (y1) & 0xFF;
HAL_LCDC_WriteU8Reg(hlcdc, 0x2b, parameter, 4);
}
static void main(int argc, char **argv)
{
uint8_t *p_framebuffer = (uint8_t *) 0x60020000;
/*Turn on LCD board power supply*/
Poweron_LCD_Board();
memset(&hlcdc_rm69090, 0, sizeof(hlcdc_rm69090));
hlcdc_rm69090.Instance = hwp_lcdc;
/*Set background layer color*/
hlcdc_rm69090.bg.r = 0;
hlcdc_rm69090.bg.g = 0;
hlcdc_rm69090.bg.b = 255;
/*Set default layer configuration*/
hlcdc_rm69090.Layer.layer_alpha_en = 0;
hlcdc_rm69090.Layer.alpha = 255;
hlcdc_rm69090.Layer.chroma_key_en = 0;
memcpy(&hlcdc_rm69090.Init, &lcdc_int_cfg, sizeof(LCDC_InitTypeDef));
/*Open DSI & LCDC */
HAL_LCDC_Init(&hlcdc_rm69090);
/* Reset LCD by RESX pin */
HAL_LCDC_ResetLCD(&hlcdc_rm69090, LCDC_RESX_NEG_PULSE, 20);
/* Wait for 200ms */
HAL_Delay(200);
/*DSI LCD initial */
RM69090_Init_Seq(&hlcdc_rm69090);
{//Read LCD id
uint32_t rd_data = 0;
HAL_LCDC_ReadU8Reg(&hlcdc_rm69090, 0x04, (uint8_t *)&rd_data, 4);
LOG_I("rm69090 id is %d",rd_data);
}
/*Disable layer compress*/
HAL_LCDC_LayerSetCmpr(&hlcdc_rm69090, HAL_LCDC_LAYER_DEFAULT, 0);
/*Set layer format RGB565*/
HAL_LCDC_LayerSetFormat(&hlcdc_rm69090, HAL_LCDC_LAYER_DEFAULT,LCDC_PIXEL_FORMAT_RGB565);
/*Fill frambuffer with single color*/
memset(p_framebuffer, 0xE0, 100*100*2);
/*Assign framebuffer and area to layer*/
HAL_LCDC_LayerSetData(&hlcdc_rm69090, HAL_LCDC_LAYER_DEFAULT, (uint8_t *)p_framebuffer, 100, 100, 199, 199);
/*Set clip area of all LCDC layer*/
HAL_LCDC_SetROIArea(&hlcdc_rm69090, 100, 100, 199, 199);
/*Set LCD receive area */
RM69090_SetRegion(&hlcdc_rm69090, 100, 100, 199, 199);
/*Enable LCDC IRQ*/
HAL_NVIC_SetPriority(LCDC_IRQ_NUM, 3, 0);
HAL_NVIC_EnableIRQ(LCDC_IRQ_NUM);
/*
Start partial writting framebuffer，
RM69090_SetRegion is the function of setting LCD recieve area, and it was called during partial write DSI LCD
*/
HAL_LCDC_DSI_StartPatialWrite(&hlcdc_rm69090, 0x2c, (SetRegion_cb_t)RM69090_SetRegion);
/* Wait for 150ms */
HAL_Delay(150);
/*Writing framebuffer is done while LCDC_IRQHandler come*/
/*Disable LCDC IRQ*/
HAL_NVIC_DisableIRQ(LCDC_IRQ_NUM);
}