Question
STM32H747XI MIPI-DSI on M4 core
Hi,
I am migrating my software from STM32F778AI to STM32H747XI due to performance issues..
I decided to handle basic operations and display on M4 core (include TouchGFX) and heavy calculations on M7 core.
I use external SDRAM and enabled FMC and initialized and it is working.
My MIPI-DSI commands working because I able to initialize my display (and tearing effect pin) but when I try to refresh the display the display don't change but I get HAL_DSI_EndOfRefreshCallback interrupt.
This exactly code working on my STM32F778AI so I don't think it is initialization issue but I think it is LTDC/DSI not working on M4 core.
Is there any special settings that I need to add to make DSI+LTDC with External RAM on M4 Core?
DSI:
static 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_LPCmdTypeDef LPCmd = {0};
DSI_CmdCfgTypeDef CmdCfg = {0};
/* USER CODE BEGIN DSIHOST_Init 1 */
/* USER CODE END DSIHOST_Init 1 */
hdsi.Instance = DSI;
hdsi.Init.AutomaticClockLaneControl = DSI_AUTO_CLK_LANE_CTRL_DISABLE;
hdsi.Init.TXEscapeCkdiv = 2;
hdsi.Init.NumberOfLanes = DSI_ONE_DATA_LANE;
PLLInit.PLLNDIV = 10;
PLLInit.PLLIDF = DSI_PLL_IN_DIV1;
PLLInit.PLLODF = DSI_PLL_OUT_DIV1;
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 = 20;
PhyTimings.ClockLaneLP2HSTime = 18;
PhyTimings.DataLaneHS2LPTime = 10;
PhyTimings.DataLaneLP2HSTime = 13;
PhyTimings.DataLaneMaxReadTime = 0;
PhyTimings.StopWaitTime = 7;
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();
}
LPCmd.LPGenShortWriteNoP = DSI_LP_GSW0P_DISABLE;
LPCmd.LPGenShortWriteOneP = DSI_LP_GSW1P_DISABLE;
LPCmd.LPGenShortWriteTwoP = DSI_LP_GSW2P_DISABLE;
LPCmd.LPGenShortReadNoP = DSI_LP_GSR0P_DISABLE;
LPCmd.LPGenShortReadOneP = DSI_LP_GSR1P_DISABLE;
LPCmd.LPGenShortReadTwoP = DSI_LP_GSR2P_DISABLE;
LPCmd.LPGenLongWrite = DSI_LP_GLW_DISABLE;
LPCmd.LPDcsShortWriteNoP = DSI_LP_DSW0P_DISABLE;
LPCmd.LPDcsShortWriteOneP = DSI_LP_DSW1P_DISABLE;
LPCmd.LPDcsShortReadNoP = DSI_LP_DSR0P_DISABLE;
LPCmd.LPDcsLongWrite = DSI_LP_DLW_DISABLE;
LPCmd.LPMaxReadPacket = DSI_LP_MRDP_DISABLE;
LPCmd.AcknowledgeRequest = DSI_ACKNOWLEDGE_DISABLE;
if (HAL_DSI_ConfigCommand(&hdsi, &LPCmd) != HAL_OK)
{
Error_Handler();
}
CmdCfg.VirtualChannelID = 0;
CmdCfg.ColorCoding = DSI_RGB888;
CmdCfg.CommandSize = 320;
CmdCfg.TearingEffectSource = DSI_TE_EXTERNAL;
CmdCfg.TearingEffectPolarity = DSI_TE_FALLING_EDGE;
CmdCfg.HSPolarity = DSI_HSYNC_ACTIVE_LOW;
CmdCfg.VSPolarity = DSI_VSYNC_ACTIVE_LOW;
CmdCfg.DEPolarity = DSI_DATA_ENABLE_ACTIVE_HIGH;
CmdCfg.VSyncPol = DSI_VSYNC_FALLING;
CmdCfg.AutomaticRefresh = DSI_AR_ENABLE;
CmdCfg.TEAcknowledgeRequest = DSI_TE_ACKNOWLEDGE_DISABLE;
if (HAL_DSI_ConfigAdaptedCommandMode(&hdsi, &CmdCfg) != 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 */
}LTDC :
static void MX_LTDC_Init(void)
{
/* USER CODE BEGIN LTDC_Init 0 */
/* USER CODE END LTDC_Init 0 */
LTDC_LayerCfgTypeDef pLayerCfg = {0};
/* USER CODE BEGIN LTDC_Init 1 */
/* USER CODE END LTDC_Init 1 */
hltdc.Instance = LTDC;
hltdc.Init.HSPolarity = LTDC_HSPOLARITY_AL;
hltdc.Init.VSPolarity = LTDC_VSPOLARITY_AL;
hltdc.Init.DEPolarity = LTDC_DEPOLARITY_AL;
hltdc.Init.PCPolarity = LTDC_PCPOLARITY_IPC;
hltdc.Init.HorizontalSync = 0;
hltdc.Init.VerticalSync = 0;
hltdc.Init.AccumulatedHBP = 0;
hltdc.Init.AccumulatedVBP = 0;
hltdc.Init.AccumulatedActiveW = 320;
hltdc.Init.AccumulatedActiveH = 360;
hltdc.Init.TotalWidth = 320;
hltdc.Init.TotalHeigh = 360;
hltdc.Init.Backcolor.Blue = 0;
hltdc.Init.Backcolor.Green = 0;
hltdc.Init.Backcolor.Red = 0;
if (HAL_LTDC_Init(&hltdc) != HAL_OK)
{
Error_Handler();
}
pLayerCfg.WindowX0 = 0;
pLayerCfg.WindowX1 = 320;
pLayerCfg.WindowY0 = 0;
pLayerCfg.WindowY1 = 360;
pLayerCfg.PixelFormat = LTDC_PIXEL_FORMAT_RGB888;
pLayerCfg.Alpha = 0;
pLayerCfg.Alpha0 = 0;
pLayerCfg.BlendingFactor1 = LTDC_BLENDING_FACTOR1_CA;
pLayerCfg.BlendingFactor2 = LTDC_BLENDING_FACTOR2_CA;
pLayerCfg.FBStartAdress = 0xC0000000;
pLayerCfg.ImageWidth = 320;
pLayerCfg.ImageHeight = 360;
pLayerCfg.Backcolor.Blue = 0;
pLayerCfg.Backcolor.Green = 0;
pLayerCfg.Backcolor.Red = 0;
if (HAL_LTDC_ConfigLayer(&hltdc, &pLayerCfg, 0) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN LTDC_Init 2 */
/* USER CODE END LTDC_Init 2 */
}additional comments:
- I use HAL_DSI_Start(&hdsi); when I initialize display.
- I tried to initialize SDRAM in M7 and M4 without any change.
- I checked my SDRAM and it seems to work.
- On my STM32F778AI I also use external ram for display
Is there anything that I forget?
I need to use MDMA?
Thanks,
David
