Question
STM32H747XI DSIHost - No output on HAL_DSI_ShortWrite
Hello,
I have a custom pcb with STM32H747XI and a DSI LCD. Everything is on M7 with PWR_DIRECT_SMPS_SUPPLY.
The issue that I am facing is that I can't write any data on lanes. Both Positive and Negative are on 1.44v constantly.
I tried to be as close as possible to LCD_DSI_VideoMode_SingleBuffer example but with using .ioc generated code.
Attached you can find the .ioc and I can upload the whole project if required but probably I miss something in general.
Below are the MX_DSIHOST_DSI_Init & HAL_DSI_MspInit as generated.
(the clock for DSI is around 7Mhz for debug)
void MX_DSIHOST_DSI_Init(void)
{
/* USER CODE BEGIN DSIHOST_Init 0 */
/* USER CODE END DSIHOST_Init 0 */
DSI_PLLInitTypeDef PLLInit = {0};
DSI_HOST_TimeoutTypeDef HostTimeouts = {0};
DSI_PHY_TimerTypeDef PhyTimings = {0};
DSI_VidCfgTypeDef VidCfg = {0};
/* USER CODE BEGIN DSIHOST_Init 1 */
/* USER CODE END DSIHOST_Init 1 */
hdsi.Instance = DSI;
hdsi.Init.AutomaticClockLaneControl = DSI_AUTO_CLK_LANE_CTRL_ENABLE;
hdsi.Init.TXEscapeCkdiv = 4;
hdsi.Init.NumberOfLanes = DSI_TWO_DATA_LANES;
PLLInit.PLLNDIV = 40;
PLLInit.PLLIDF = DSI_PLL_IN_DIV2;
PLLInit.PLLODF = DSI_PLL_OUT_DIV8;
if (HAL_DSI_Init(&hdsi, &PLLInit) != HAL_OK)
{
Error_Handler();
}
HostTimeouts.TimeoutCkdiv = 1;
HostTimeouts.HighSpeedTransmissionTimeout = 0;
HostTimeouts.LowPowerReceptionTimeout = 0;
HostTimeouts.HighSpeedReadTimeout = 0;
HostTimeouts.LowPowerReadTimeout = 0;
HostTimeouts.HighSpeedWriteTimeout = 0;
HostTimeouts.HighSpeedWritePrespMode = DSI_HS_PM_DISABLE;
HostTimeouts.LowPowerWriteTimeout = 0;
HostTimeouts.BTATimeout = 0;
if (HAL_DSI_ConfigHostTimeouts(&hdsi, &HostTimeouts) != HAL_OK)
{
Error_Handler();
}
PhyTimings.ClockLaneHS2LPTime = 14;
PhyTimings.ClockLaneLP2HSTime = 6;
PhyTimings.DataLaneHS2LPTime = 6;
PhyTimings.DataLaneLP2HSTime = 3;
PhyTimings.DataLaneMaxReadTime = 0;
PhyTimings.StopWaitTime = 0;
if (HAL_DSI_ConfigPhyTimer(&hdsi, &PhyTimings) != HAL_OK)
{
Error_Handler();
}
if (HAL_DSI_ConfigFlowControl(&hdsi, DSI_FLOW_CONTROL_BTA) != HAL_OK)
{
Error_Handler();
}
if (HAL_DSI_SetLowPowerRXFilter(&hdsi, 10000) != HAL_OK)
{
Error_Handler();
}
if (HAL_DSI_ConfigErrorMonitor(&hdsi, HAL_DSI_ERROR_NONE) != HAL_OK)
{
Error_Handler();
}
VidCfg.VirtualChannelID = 0;
VidCfg.ColorCoding = DSI_RGB888;
VidCfg.LooselyPacked = DSI_LOOSELY_PACKED_DISABLE;
VidCfg.Mode = DSI_VID_MODE_BURST;
VidCfg.PacketSize = 480;
VidCfg.NumberOfChunks = 0;
VidCfg.NullPacketSize = 0;
VidCfg.HSPolarity = DSI_HSYNC_ACTIVE_LOW;
VidCfg.VSPolarity = DSI_VSYNC_ACTIVE_LOW;
VidCfg.DEPolarity = DSI_DATA_ENABLE_ACTIVE_HIGH;
VidCfg.HorizontalSyncActive = 2;
VidCfg.HorizontalBackPorch = 6;
VidCfg.HorizontalLine = 134;
VidCfg.VerticalSyncActive = 4;
VidCfg.VerticalBackPorch = 58;
VidCfg.VerticalFrontPorch = 63;
VidCfg.VerticalActive = 1120;
VidCfg.LPCommandEnable = DSI_LP_COMMAND_DISABLE;
VidCfg.LPLargestPacketSize = 0;
VidCfg.LPVACTLargestPacketSize = 0;
VidCfg.LPHorizontalFrontPorchEnable = DSI_LP_HFP_DISABLE;
VidCfg.LPHorizontalBackPorchEnable = DSI_LP_HBP_DISABLE;
VidCfg.LPVerticalActiveEnable = DSI_LP_VACT_DISABLE;
VidCfg.LPVerticalFrontPorchEnable = DSI_LP_VFP_DISABLE;
VidCfg.LPVerticalBackPorchEnable = DSI_LP_VBP_DISABLE;
VidCfg.LPVerticalSyncActiveEnable = DSI_LP_VSYNC_DISABLE;
VidCfg.FrameBTAAcknowledgeEnable = DSI_FBTAA_DISABLE;
if (HAL_DSI_ConfigVideoMode(&hdsi, &VidCfg) != HAL_OK)
{
Error_Handler();
}
if (HAL_DSI_SetGenericVCID(&hdsi, 0) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN DSIHOST_Init 2 */
/* USER CODE END DSIHOST_Init 2 */
}
void HAL_DSI_MspInit(DSI_HandleTypeDef* dsiHandle)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};
if(dsiHandle->Instance==DSI)
{
/* USER CODE BEGIN DSI_MspInit 0 */
/* USER CODE END DSI_MspInit 0 */
/** Initializes the peripherals clock
*/
PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_DSI;
PeriphClkInitStruct.DsiClockSelection = RCC_DSICLKSOURCE_PHY;
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK)
{
Error_Handler();
}
/* DSI clock enable */
__HAL_RCC_DSI_CLK_ENABLE();
__HAL_RCC_GPIOJ_CLK_ENABLE();
/**DSIHOST GPIO Configuration
DSI_D1P ------> DSIHOST_D1P
DSI_D1N ------> DSIHOST_D1N
DSI_CKP ------> DSIHOST_CKP
DSI_CKN ------> DSIHOST_CKN
DSI_D0P ------> DSIHOST_D0P
DSI_D0N ------> DSIHOST_D0N
PJ2 ------> DSIHOST_TE
*/
GPIO_InitStruct.Pin = GPIO_PIN_2;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
GPIO_InitStruct.Alternate = GPIO_AF13_DSI;
HAL_GPIO_Init(GPIOJ, &GPIO_InitStruct);
/* DSI interrupt Init */
HAL_NVIC_SetPriority(DSI_IRQn, 15, 0);
HAL_NVIC_EnableIRQ(DSI_IRQn);
/* USER CODE BEGIN DSI_MspInit 1 */
/* USER CODE END DSI_MspInit 1 */
}
}
I have created a new function for sending commands
HAL_StatusTypeDef DSI_Packet_Write_Short_DCS(uint32_t command, uint32_t parameter, uint8_t has_parameter) {
uint32_t mode;
//- Set mode according to if the command has a parameter or not
if (has_parameter > 0) {
mode = DSI_DCS_SHORT_PKT_WRITE_P0; // Mode DCS, 0 parameter
} else {
mode = DSI_DCS_SHORT_PKT_WRITE_P1; // Mode DCS, 1 parameter
}
HAL_StatusTypeDef result = HAL_DSI_ShortWrite(&hdsi, 0, mode, command, parameter);
return result;
}
And this is the init in my main
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_MDMA_Init();
MX_FMC_Init();
MX_SDMMC1_SD_Init();
MX_FATFS_Init();
MX_QUADSPI_Init();
MX_LTDC_Init();
MX_DSIHOST_DSI_Init();
MX_DMA2D_Init();
/* USER CODE BEGIN 2 */
HAL_LTDC_MspInit(&hltdc);
HAL_DMA2D_MspInit(&hdma2d);
HAL_DSI_MspInit(&hdsi);
// DSI_Reset();
HAL_DSI_Start(&hdsi);
When I call packet write I get HAL_OK but nothing on bus.
I have some doubts if it is possible to send DCS packets while in video mode, in the example it initializes the DSI in video mode and then it reads a register from the LCD (plus there are some other settings about commands in video mode) so I guessed it is possible (correct me if I am wrong)
My first target is to send some config to LCD (power, gamma, etc, as provided by the manufacturer) and then continue with LTDC generated frames but I probably missing something and can't write anything on lanes.