Hi, I'm using a custom board based on STM32U5G9J-DK1.I am using DSI Video mode with double buffering, but i had some issues in the DSI video mode.
I am using CO5300 driver-based 466 X 466 Display which supports DSI video mode
I successfully got a display displaying the actual GUI but it is slightly shifted from the left and from upper and bottom side as well
I am attaching images here; the first image is the simulator, and the second is the actual display.
Simulator Image:
Actual Hardware:
My configuration for clocks are as given below
My MX_DSIHOST_DSI_Init() function looks like below
static void MX_DSIHOST_DSI_Init(void)
{
/* USER CODE BEGIN DSIHOST_Init 0 */
// Power up sequence
HAL_GPIO_WritePin(PWR_EN_GPIO_Port, PWR_EN_Pin, GPIO_PIN_RESET);
HAL_GPIO_WritePin(BACKLIGHT_EN_GPIO_Port, BACKLIGHT_EN_Pin, GPIO_PIN_RESET);
HAL_Delay(10);
HAL_GPIO_WritePin(PANEL_RESET_GPIO_Port, PANEL_RESET_Pin, GPIO_PIN_RESET);
HAL_Delay(10);
HAL_GPIO_WritePin(VCI_EN_GPIO_Port, VCI_EN_Pin, GPIO_PIN_SET);
HAL_Delay(10);
HAL_GPIO_WritePin(BACKLIGHT_EN_GPIO_Port, BACKLIGHT_EN_Pin, GPIO_PIN_SET);
HAL_Delay(100);
HAL_GPIO_WritePin(PWR_EN_GPIO_Port, PWR_EN_Pin, GPIO_PIN_SET);
/* 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_ONE_DATA_LANE;
hdsi.Init.PHYFrequencyRange = DSI_DPHY_FRANGE_450MHZ_510MHZ;
hdsi.Init.PHYLowPowerOffset = PHY_LP_OFFSSET_0_CLKP;
PLLInit.PLLNDIV = 125;
PLLInit.PLLIDF = DSI_PLL_IN_DIV4;
PLLInit.PLLODF = DSI_PLL_OUT_DIV2;
PLLInit.PLLVCORange = DSI_DPHY_VCO_FRANGE_800MHZ_1GHZ;
PLLInit.PLLChargePump = DSI_PLL_CHARGE_PUMP_2000HZ_4400HZ;
PLLInit.PLLTuning = DSI_PLL_LOOP_FILTER_2000HZ_4400HZ;
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 = 40;
PhyTimings.ClockLaneLP2HSTime = 40;
PhyTimings.DataLaneHS2LPTime = 12;
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_SetLanePinsConfiguration(&hdsi, DSI_SWAP_LANE_PINS, DSI_CLOCK_LANE, ENABLE) != HAL_OK)
{
Error_Handler();
}
if (HAL_DSI_ConfigErrorMonitor(&hdsi, HAL_DSI_ERROR_NONE) != HAL_OK)
{
Error_Handler();
}
VidCfg.ColorCoding = DSI_RGB888;
VidCfg.LooselyPacked = DSI_LOOSELY_PACKED_DISABLE;
VidCfg.Mode = DSI_VID_MODE_BURST;
VidCfg.PacketSize = 466;
VidCfg.NumberOfChunks = 0;
VidCfg.NullPacketSize = 0;
VidCfg.HSPolarity = DSI_HSYNC_ACTIVE_HIGH;
VidCfg.VSPolarity = DSI_VSYNC_ACTIVE_HIGH;
VidCfg.DEPolarity = DSI_DATA_ENABLE_ACTIVE_HIGH;
VidCfg.HorizontalSyncActive = 1;
VidCfg.HorizontalBackPorch = 1;
VidCfg.HorizontalLine = 466;
VidCfg.VerticalSyncActive = 2;
VidCfg.VerticalBackPorch = 2;
VidCfg.VerticalFrontPorch = 2;
VidCfg.VerticalActive = 466;
VidCfg.LPCommandEnable = DSI_LP_COMMAND_DISABLE;
VidCfg.LPLargestPacketSize = 0;
VidCfg.LPVACTLargestPacketSize = 0;
VidCfg.LPHorizontalFrontPorchEnable = DSI_LP_HFP_ENABLE;
VidCfg.LPHorizontalBackPorchEnable = DSI_LP_HBP_ENABLE;
VidCfg.LPVerticalActiveEnable = DSI_LP_VACT_ENABLE;
VidCfg.LPVerticalFrontPorchEnable = DSI_LP_VFP_ENABLE;
VidCfg.LPVerticalBackPorchEnable = DSI_LP_VBP_ENABLE;
VidCfg.LPVerticalSyncActiveEnable = DSI_LP_VSYNC_ENABLE;
VidCfg.FrameBTAAcknowledgeEnable = DSI_FBTAA_ENABLE;
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 */
if (HAL_DSI_Start(&hdsi) != HAL_OK)
{
Error_Handler();
}
RCC_PeriphCLKInitTypeDef PeriphClkInit;
PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_DSI;
PeriphClkInit.DsiClockSelection = RCC_DSICLKSOURCE_DSIPHY;
HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit);
// display reset
HAL_GPIO_WritePin(PANEL_RESET_GPIO_Port, PANEL_RESET_Pin, GPIO_PIN_RESET);
HAL_Delay(20);
HAL_GPIO_WritePin(PANEL_RESET_GPIO_Port, PANEL_RESET_Pin, GPIO_PIN_SET);
HAL_Delay(200);
/* USER CODE END DSIHOST_Init 2 */
}
My MX_LTDS_Init look like below
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_AH;
hltdc.Init.VSPolarity = LTDC_VSPOLARITY_AH;
hltdc.Init.DEPolarity = LTDC_DEPOLARITY_AL;
hltdc.Init.PCPolarity = LTDC_PCPOLARITY_IIPC;
hltdc.Init.HorizontalSync = 1;
hltdc.Init.VerticalSync = 1;
hltdc.Init.AccumulatedHBP = 3;
hltdc.Init.AccumulatedVBP = 3;
hltdc.Init.AccumulatedActiveW = 469;
hltdc.Init.AccumulatedActiveH = 469;
hltdc.Init.TotalWidth = 471;
hltdc.Init.TotalHeigh = 471;
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 = 466;
pLayerCfg.WindowY0 = 0;
pLayerCfg.WindowY1 = 466;
pLayerCfg.PixelFormat = LTDC_PIXEL_FORMAT_ARGB8888;
pLayerCfg.Alpha = 255;
pLayerCfg.Alpha0 = 0;
pLayerCfg.BlendingFactor1 = LTDC_BLENDING_FACTOR1_CA;
pLayerCfg.BlendingFactor2 = LTDC_BLENDING_FACTOR2_CA;
pLayerCfg.FBStartAdress = 0x0;
pLayerCfg.ImageWidth = 466;
pLayerCfg.ImageHeight = 466;
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 */
HAL_Delay(100);
// Page 0
HAL_DSI_ShortWrite(&hdsi, 0, DSI_DCS_SHORT_PKT_WRITE_P1, 0xFE, 0x00);
// TE ON
HAL_DSI_ShortWrite(&hdsi, 0, DSI_DCS_SHORT_PKT_WRITE_P1, 0x35, 0x00);
// Ctrl Display
HAL_DSI_ShortWrite(&hdsi, 0, DSI_DCS_SHORT_PKT_WRITE_P1, 0x53, 0x20);
// Brightness
HAL_DSI_ShortWrite(&hdsi, 0, DSI_DCS_SHORT_PKT_WRITE_P1, 0x51, 0xFF);
HAL_DSI_ShortWrite(&hdsi, 0, DSI_DCS_SHORT_PKT_WRITE_P1, 0x63, 0xFF);
// Set column/row (example payloads)
uint8_t col[] = {0x00,0x06,0x01,0xD7};
uint8_t row[] = {0x00,0x00,0x01,0xD1};
HAL_DSI_LongWrite(&hdsi, 0, DSI_GEN_LONG_PKT_WRITE, 5, 0x2A, col);
HAL_DSI_LongWrite(&hdsi, 0, DSI_GEN_LONG_PKT_WRITE, 5, 0x2B, row);
// Sleep Out, Display ON
HAL_Delay(100);
HAL_DSI_ShortWrite(&hdsi, 0, DSI_DCS_SHORT_PKT_WRITE_P0, 0x11, 0);
HAL_Delay(100);
HAL_DSI_ShortWrite(&hdsi, 0, DSI_DCS_SHORT_PKT_WRITE_P0, 0x29, 0);
HAL_Delay(120);
// pLayerCfg.FBStartAdress = (uint32_t)disp_buffer;
for (int var = 0; var < 478*478; var++) {
disp_buffer[var] = 0xFF00FF00;
}
// while(1);
/* USER CODE END LTDC_Init 2 */
}
I have been debugging for over five days, yet the problem still exists. I am new to touchGFX so i dont have expertise like you guys.
Help will be really appreciated.
