配置SMC驱动SDRAM

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[]()首先创建一个工程文件 参考官方原理图配置系统时钟和FMC接口

时钟配置

时钟树如下显示

在RCC选项中启用外部高速晶振

配置总线时钟速度位180Mhz

配置FMC接口 并添加SDRAM驱动文件

SDRAM通过FMC接口访问SDRAM FMC配置如下

完成上图配置 生成代码文件

在keil中添加SDRAM驱动文件，

#define BUFFER_SIZE         ((uint32_t)0x1000)
#define WRITE_READ_ADDR     ((uint32_t)0x0800)
#define SDRAM_BANK_ADDR                 ((uint32_t)0xC0000000)

/* #define SDRAM_MEMORY_WIDTH            FMC_SDRAM_MEM_BUS_WIDTH_8  */
#define SDRAM_MEMORY_WIDTH               FMC_SDRAM_MEM_BUS_WIDTH_16

#define SDCLOCK_PERIOD                   FMC_SDRAM_CLOCK_PERIOD_2
/* #define SDCLOCK_PERIOD                FMC_SDRAM_CLOCK_PERIOD_3 */

#define SDRAM_TIMEOUT     ((uint32_t)0xFFFF)

#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)

  hsdram.Instance = FMC_SDRAM_DEVICE;

  SDRAM_Timing.LoadToActiveDelay    = 2;
  SDRAM_Timing.ExitSelfRefreshDelay = 6;
  SDRAM_Timing.SelfRefreshTime      = 4;
  SDRAM_Timing.RowCycleDelay        = 6;
  SDRAM_Timing.WriteRecoveryTime    = 2;
  SDRAM_Timing.RPDelay              = 2;
  SDRAM_Timing.RCDDelay             = 2;

  hsdram.Init.SDBank             = FMC_SDRAM_BANK1;
  hsdram.Init.ColumnBitsNumber   = FMC_SDRAM_COLUMN_BITS_NUM_8;
  hsdram.Init.RowBitsNumber      = FMC_SDRAM_ROW_BITS_NUM_12;
  hsdram.Init.MemoryDataWidth    = SDRAM_MEMORY_WIDTH;
  hsdram.Init.InternalBankNumber = FMC_SDRAM_INTERN_BANKS_NUM_4;
  hsdram.Init.CASLatency         = FMC_SDRAM_CAS_LATENCY_2;
  hsdram.Init.WriteProtection    = FMC_SDRAM_WRITE_PROTECTION_DISABLE;
  hsdram.Init.SDClockPeriod      = SDCLOCK_PERIOD;
  hsdram.Init.ReadBurst          = FMC_SDRAM_RBURST_ENABLE;
  hsdram.Init.ReadPipeDelay      = FMC_SDRAM_RPIPE_DELAY_0;

  /* Initialize the SDRAM controller */
  if(HAL_SDRAM_Init(&hsdram, &SDRAM_Timing) != HAL_OK)
  {
    /* Initialization Error */
    Error_Handler();
  }

  /* Program the SDRAM external device */
  BSP_SDRAM_Initialization_Sequence(&hsdram, &command);

  /*##-2- SDRAM memory read/write access #####################################*/

  /* Fill the buffer to write */
  Fill_Buffer(aTxBuffer, BUFFER_SIZE, 0xA244250F);

  /* Write data to the SDRAM memory */
  for (uwIndex = 0; uwIndex < BUFFER_SIZE; uwIndex++)
  {
    *(__IO uint32_t*) (SDRAM_BANK_ADDR + WRITE_READ_ADDR + 4*uwIndex) = aTxBuffer[uwIndex];
  }

  /* Read back data from the SDRAM memory */
  for (uwIndex = 0; uwIndex < BUFFER_SIZE; uwIndex++)
  {
    aRxBuffer[uwIndex] = *(__IO uint32_t*) (SDRAM_BANK_ADDR + WRITE_READ_ADDR + 4*uwIndex);
  }

  /*##-3- Checking data integrity ############################################*/

  for (uwIndex = 0; (uwIndex < BUFFER_SIZE) && (uwWriteReadStatus == 0); uwIndex++)
  {
    if (aRxBuffer[uwIndex] != aTxBuffer[uwIndex])
    {
      uwWriteReadStatus++;
    }
  }

在初始化完FMC接口之后 初始化SDRAM芯片 这里我们在SDRAM测试函数中打断点 如果数据写入成功并校验成功 断点会停在对应位置

如图这个时候SDRAM就已经成功驱动了

[]()在keil的memory界面中输入SDRAM的基地址

可以看到数据已经存到SDRAM中

配置LTDC屏幕接口

首先启用DM2D加速模块

LDTC接口配置

将显存地址配置到SDRAM的地址当中

之后直接生成工程

TouchGFX工程编辑

打开touchgfx工程

添加控件 并生成代码

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[]()在Keil工程目录下找到TouchGFXApp这个文件 将头文件复制到Freertos文件中

#include "app_touchgfx.h"

返回freertos.c

void StartTouchGFXTask(void const * argument)
{
  /* USER CODE BEGIN StartTouchGFXTask */
  /* Infinite loop */
  for(;;)
  {
MX_TouchGFX_Process();
    osDelay(1);
  }
  /* USER CODE END StartTouchGFXTask */
}

在TouchGFX任务中添加函数

[]()编译并且运行

成功显示