I am using 12.1" TFT Display of 800x600 resolution and interfacing it with STM32F429BI Micro-controller and IS42S16400J SDRAM .I am getting the flickering issue in my display. When i bypass the SDRAM it working ok , there is no flickering, but on connecting through SDRAM it starts giving flickering issue.
#define REFRESH_COUNT ((uint32_t)(1386)) /* SDRAM refresh counter at 90Mhz*/
#define SDRAM_TIMEOUT ((uint32_t)0xFFFF)
#define SDRAM_DEVICE_ADDR ((unsigned int)0xD0000000)
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct;
RCC_ClkInitTypeDef RCC_ClkInitStruct;
RCC_PeriphCLKInitTypeDef PeriphClkInitStruct;
__PWR_CLK_ENABLE();
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE|RCC_OSCILLATORTYPE_LSE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
RCC_OscInitStruct.LSEState = RCC_LSE_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLM =4;
RCC_OscInitStruct.PLL.PLLN =180;
RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
RCC_OscInitStruct.PLL.PLLQ = 4;
HAL_RCC_OscConfig(&RCC_OscInitStruct);
HAL_PWREx_ActivateOverDrive();
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_SYSCLK|RCC_CLOCKTYPE_PCLK1
|RCC_CLOCKTYPE_PCLK2;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV4;
HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5);
PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_LTDC|RCC_PERIPHCLK_RTC;
PeriphClkInitStruct.PLLSAI.PLLSAIN =144;//18MHz
PeriphClkInitStruct.PLLSAI.PLLSAIR = 4;
PeriphClkInitStruct.PLLSAIDivR = RCC_PLLSAIDIVR_4;
PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_LSE;
HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct);
HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000);
HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);
HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);
}
void MX_LTDC_Init(void)
{
LTDC_LayerCfgTypeDef pLayerCfg;
hltdc.Instance = LTDC;
hltdc.Init.HSPolarity =LTDC_HSPOLARITY_AH;
hltdc.Init.VSPolarity = LTDC_VSPOLARITY_AL;
hltdc.Init.DEPolarity =LTDC_DEPOLARITY_AL;
hltdc.Init.PCPolarity = LTDC_PCPOLARITY_IPC;
hltdc.Init.HorizontalSync = 40;
hltdc.Init.VerticalSync = 9;
hltdc.Init.AccumulatedHBP = 42;
hltdc.Init.AccumulatedVBP = 11;
hltdc.Init.AccumulatedActiveW = 1054;
hltdc.Init.AccumulatedActiveH = 664;
hltdc.Init.TotalWidth = 1056;
hltdc.Init.TotalHeigh = 666;
hltdc.Init.Backcolor.Blue = 0;
hltdc.Init.Backcolor.Green = 0;
hltdc.Init.Backcolor.Red = 0;
HAL_LTDC_Init(&hltdc);
pLayerCfg.WindowX0 = 0;
pLayerCfg.WindowX1 = 800;
pLayerCfg.WindowY0 = 0;
pLayerCfg.WindowY1 = 600;
pLayerCfg.PixelFormat = LTDC_PIXEL_FORMAT_RGB565;
pLayerCfg.Alpha = 255;
pLayerCfg.Alpha0 = 0;
pLayerCfg.BlendingFactor1 = LTDC_BLENDING_FACTOR1_PAxCA;
pLayerCfg.BlendingFactor2 = LTDC_BLENDING_FACTOR2_PAxCA;
pLayerCfg.FBStartAdress = SDRAM_DEVICE_ADDR;//(uint32_t)&Color;
pLayerCfg.ImageWidth = 800;
pLayerCfg.ImageHeight = 600;
pLayerCfg.Backcolor.Blue = 0;
pLayerCfg.Backcolor.Green = 0;
pLayerCfg.Backcolor.Red = 0;
HAL_LTDC_ConfigLayer(&hltdc, &pLayerCfg, 0);
}
void MX_FMC_Init(void)
{
FMC_SDRAM_TimingTypeDef SdramTiming;
hsdram1.Instance = FMC_SDRAM_DEVICE;
hsdram1.Init.SDBank = FMC_SDRAM_BANK2;
hsdram1.Init.ColumnBitsNumber = FMC_SDRAM_COLUMN_BITS_NUM_8;
hsdram1.Init.RowBitsNumber = FMC_SDRAM_ROW_BITS_NUM_12;
hsdram1.Init.MemoryDataWidth = FMC_SDRAM_MEM_BUS_WIDTH_16;
hsdram1.Init.InternalBankNumber = FMC_SDRAM_INTERN_BANKS_NUM_4;
hsdram1.Init.CASLatency = FMC_SDRAM_CAS_LATENCY_3;
hsdram1.Init.WriteProtection = FMC_SDRAM_WRITE_PROTECTION_DISABLE;
hsdram1.Init.SDClockPeriod = FMC_SDRAM_CLOCK_PERIOD_2;
hsdram1.Init.ReadBurst = FMC_SDRAM_RBURST_DISABLE;
hsdram1.Init.ReadPipeDelay = FMC_SDRAM_RPIPE_DELAY_1;
SdramTiming.LoadToActiveDelay = 2;
SdramTiming.ExitSelfRefreshDelay = 14;
SdramTiming.SelfRefreshTime = 14;
SdramTiming.RowCycleDelay = 14;
SdramTiming.WriteRecoveryTime = 2;
SdramTiming.RPDelay = 4;
SdramTiming.RCDDelay = 4;
HAL_SDRAM_Init(&hsdram1, &SdramTiming);
BSP_SDRAM_Initialization_sequence(REFRESH_COUNT);
}
void BSP_SDRAM_Initialization_sequence(uint32_t RefreshCount)
{
__IO uint32_t tmpmrd =0;
Command.CommandMode = FMC_SDRAM_CMD_CLK_ENABLE;
Command.CommandTarget = FMC_SDRAM_CMD_TARGET_BANK2;
Command.AutoRefreshNumber = 1;
Command.ModeRegisterDefinition = 0;
HAL_SDRAM_SendCommand(&hsdram1, &Command, SDRAM_TIMEOUT);
HAL_Delay(1);
Command.CommandMode = FMC_SDRAM_CMD_PALL;
Command.CommandTarget = FMC_SDRAM_CMD_TARGET_BANK2;
Command.AutoRefreshNumber = 1;
Command.ModeRegisterDefinition = 0;
HAL_SDRAM_SendCommand(&hsdram1, &Command, SDRAM_TIMEOUT);
Command.CommandMode = FMC_SDRAM_CMD_AUTOREFRESH_MODE;
Command.CommandTarget = FMC_SDRAM_CMD_TARGET_BANK2;
Command.AutoRefreshNumber = 4;
Command.ModeRegisterDefinition = 0;
HAL_SDRAM_SendCommand(&hsdram1, &Command, SDRAM_TIMEOUT);
tmpmrd = (uint32_t)SDRAM_MODEREG_BURST_LENGTH_1 |
SDRAM_MODEREG_BURST_TYPE_SEQUENTIAL |
SDRAM_MODEREG_CAS_LATENCY_3 |
SDRAM_MODEREG_OPERATING_MODE_STANDARD |
SDRAM_MODEREG_WRITEBURST_MODE_SINGLE;
Command.CommandMode = FMC_SDRAM_CMD_LOAD_MODE;
Command.CommandTarget = FMC_SDRAM_CMD_TARGET_BANK2;
Command.AutoRefreshNumber = 1;
Command.ModeRegisterDefinition = tmpmrd;
HAL_SDRAM_SendCommand(&hsdram1, &Command, SDRAM_TIMEOUT);
HAL_SDRAM_ProgramRefreshRate(&hsdram1, RefreshCount);
}
