32F429IDISCOVERY - - LTDC [2] + FMC (SDRAM)

前言

上一篇LTDC的圖形是直接載入存在flash中的ST_LOGO_1[]陣列，

STM32CubeMX在設定LTDC的Layer Buffer Address指定起始位址0xD0000000 (FMC映射外部SDRAM)

接下來的操作將啟動SDRAM，並把ST_LOGO_1[]丟到SDRAM，LCD來顯示

操作環境

• Board：32F429IDISCOVERY
• LCD：2.4" QVGA(240x320) FRD240C48003-B
• IDE：STM32CubeIDE
• Code：STM32CubeMX
• Software Packs：STM32Cube_FW_F4_V1.28.0
• Picture：st_logo1.bmp

操作步驟

0．

把上一篇的程式加入的這一段刪除

main.c

static void MX_LTDC_Init(void)
{
  /* USER CODE BEGIN LTDC_Init 2 */
  //pLayerCfg.FBStartAdress = (uint32_t)&ST_LOGO_1;//戴入圖檔
  //if (HAL_LTDC_ConfigLayer(&hltdc, &pLayerCfg, 0) != HAL_OK)
  //{
  //  Error_Handler();
  //}
  /* USER CODE END LTDC_Init 2 */
}

1．加入SDRAM的初始化程式

這段程式的出處

..\STM32Cube_FW_F4_V1.28.0\Projects\STM32F429I-Discovery\Examples\FMC\FMC_SDRAM\Src\main.c

main.c

FMC_SDRAM_CommandTypeDef command;

#define REFRESH_COUNT       ((uint32_t)0x056A)   /* SDRAM refresh counter (90MHz SDRAM clock) */
#define SDRAM_BANK_ADDR     ((uint32_t)0xD0000000)

#define SDRAM_MODEREG_BURST_LENGTH_1             ((uint16_t)0x0000)
#define SDRAM_MODEREG_BURST_LENGTH_2             ((uint16_t)0x0001)
#define SDRAM_MODEREG_BURST_LENGTH_4             ((uint16_t)0x0002)
#define SDRAM_MODEREG_BURST_LENGTH_8             ((uint16_t)0x0004)
#define SDRAM_MODEREG_BURST_TYPE_SEQUENTIAL      ((uint16_t)0x0000)
#define SDRAM_MODEREG_BURST_TYPE_INTERLEAVED     ((uint16_t)0x0008)
#define SDRAM_MODEREG_CAS_LATENCY_2              ((uint16_t)0x0020)
#define SDRAM_MODEREG_CAS_LATENCY_3              ((uint16_t)0x0030)
#define SDRAM_MODEREG_OPERATING_MODE_STANDARD    ((uint16_t)0x0000)
#define SDRAM_MODEREG_WRITEBURST_MODE_PROGRAMMED ((uint16_t)0x0000)
#define SDRAM_MODEREG_WRITEBURST_MODE_SINGLE     ((uint16_t)0x0200)

static void SDRAM_Initialization_Sequence(SDRAM_HandleTypeDef *hsdram, FMC_SDRAM_CommandTypeDef *Command)
{
  __IO uint32_t tmpmrd =0;
  /* Step 3:  Configure a clock configuration enable command */
  Command->CommandMode 			 = FMC_SDRAM_CMD_CLK_ENABLE;
  Command->CommandTarget 		 = FMC_SDRAM_CMD_TARGET_BANK2;
  Command->AutoRefreshNumber 	 = 1;
  Command->ModeRegisterDefinition = 0;

  /* Send the command */
  HAL_SDRAM_SendCommand(hsdram, Command, 0x1000);

  /* Step 4: Insert 100 ms delay */
  HAL_Delay(100);

  /* Step 5: Configure a PALL (precharge all) command */
  Command->CommandMode 			 = FMC_SDRAM_CMD_PALL;
  Command->CommandTarget 	     = FMC_SDRAM_CMD_TARGET_BANK2;
  Command->AutoRefreshNumber 	 = 1;
  Command->ModeRegisterDefinition = 0;

  /* Send the command */
  HAL_SDRAM_SendCommand(hsdram, Command, 0x1000);

  /* Step 6 : Configure a Auto-Refresh command */
  Command->CommandMode 			 = FMC_SDRAM_CMD_AUTOREFRESH_MODE;
  Command->CommandTarget 		 = FMC_SDRAM_CMD_TARGET_BANK2;
  Command->AutoRefreshNumber 	 = 4;
  Command->ModeRegisterDefinition = 0;

  /* Send the command */
  HAL_SDRAM_SendCommand(hsdram, Command, 0x1000);

  /* Step 7: Program the external memory mode register */
  tmpmrd = (uint32_t)SDRAM_MODEREG_BURST_LENGTH_2          |
                     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;

  /* Send the command */
  HAL_SDRAM_SendCommand(hsdram, Command, 0x1000);

  /* Step 8: Set the refresh rate counter */
  /* (15.62 us x Freq) - 20 */
  /* Set the device refresh counter */
  HAL_SDRAM_ProgramRefreshRate(hsdram, REFRESH_COUNT);
}

main.c

  
int main(void)
{
  SDRAM_Initialization_Sequence(&hsdram1, &command);
  HAL_SDRAM_Write_16b(&hsdram1, (uint32_t*)SDRAM_BANK_ADDR, ST_LOGO_1, (240*320));
}