99-SDRAM

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在 fmc.c 中添加相关定义和函数配置ADRAM

/* USER CODE BEGIN 0 */



static FMC_SDRAM_CommandTypeDef Command;



/**
  * @brief  延迟一段时间
  * @param  延迟的时间长度
  * @retval None
  */
static void SDRAM_delay(__IO uint32_t nCount)
{
  __IO uint32_t index = 0; 
  for(index = (100000 * nCount); index != 0; index--)
  {
  }
}


/**
  * @brief  对SDRAM芯片进行初始化配置
  * @param  None. 
  * @retval None.
  */
void SDRAM_InitSequence(void)
{
  uint32_t tmpr = 0;
  
/* Step 3 --------------------------------------------------------------------*/
  /* 配置命令：开启提供给SDRAM的时钟 */
  Command.CommandMode = FMC_SDRAM_CMD_CLK_ENABLE;
  Command.CommandTarget = FMC_COMMAND_TARGET_BANK;
  Command.AutoRefreshNumber = 1;
  Command.ModeRegisterDefinition = 0;
/* Send the command */
  HAL_SDRAM_SendCommand(&sdramHandle, &Command, SDRAM_TIMEOUT);

  /* Step 2: Insert 100 us minimum delay */ 
  /* Inserted delay is equal to 1 ms due to systick time base unit (ms) */
  SDRAM_delay(1);
    
/* Step 5 --------------------------------------------------------------------*/
  /* 配置命令：对所有的bank预充电 */ 
  Command.CommandMode = FMC_SDRAM_CMD_PALL;
  Command.CommandTarget = FMC_COMMAND_TARGET_BANK;
  Command.AutoRefreshNumber = 1;
  Command.ModeRegisterDefinition = 0;
/* Send the command */
  HAL_SDRAM_SendCommand(&sdramHandle, &Command, SDRAM_TIMEOUT);   
  
/* Step 6 --------------------------------------------------------------------*/
  /* 配置命令：自动刷新 */   
  Command.CommandMode = FMC_SDRAM_CMD_AUTOREFRESH_MODE;
  Command.CommandTarget = FMC_COMMAND_TARGET_BANK;
  Command.AutoRefreshNumber = 4;
  Command.ModeRegisterDefinition = 0;
 /* Send the command */
  HAL_SDRAM_SendCommand(&sdramHandle, &Command, SDRAM_TIMEOUT);
  
/* Step 7 --------------------------------------------------------------------*/
  /* 设置sdram寄存器配置 */
  tmpr = (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;
  
  /* 配置命令：设置SDRAM寄存器 */
  Command.CommandMode = FMC_SDRAM_CMD_LOAD_MODE;
  Command.CommandTarget = FMC_COMMAND_TARGET_BANK;
  Command.AutoRefreshNumber = 1;
  Command.ModeRegisterDefinition = tmpr;
  /* Send the command */
  HAL_SDRAM_SendCommand(&sdramHandle, &Command, SDRAM_TIMEOUT);
  
/* Step 8 --------------------------------------------------------------------*/

  /* 设置刷新计数器 */
  /*刷新速率 = (COUNT + 1) x SDRAM 频率时钟
    COUNT =（ SDRAM 刷新周期/行数) - 20*/
  /* 64ms/8192=7.813us  (7.813 us x FSDCLK) - 20 =683 */
  HAL_SDRAM_ProgramRefreshRate(&sdramHandle, 683); 
//  FMC_SetRefreshCount(1386);
//  /* 发送上述命令*/
//  while(FMC_GetFlagStatus(FMC_BANK_SDRAM, FMC_FLAG_Busy) != RESET)
//  {
//  }
}

在 fmc.h 中添加相关定义

/* USER CODE BEGIN Private defines */

#define IS42S16400J_SIZE     (32 * 1024 * 1024)    //，32M字节

/*SDRAM 的bank选择*/  
#define FMC_BANK_SDRAM              FMC_Bank2_SDRAM  
#define FMC_COMMAND_TARGET_BANK     FMC_SDRAM_CMD_TARGET_BANK2
#define sdramHandle hsdram1
#define SDRAM_TIMEOUT               ((uint32_t)0xFFFF)
#define SDRAM_BANK_ADDR             ((uint32_t)0xD0000000)

/**
  * @brief  FMC SDRAM 模式配置的寄存器相关定义
  */
#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) 

void SDRAM_InitSequence(void);

/* USER CODE END Private defines */

在 main.c 中添加相关定义和函数

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */

#include "stdio.h"

long long count=0,sdram_count=0;
uint32_t RadomBuffer[10000];
uint32_t ReadBuffer[10000];
#define SDRAM_SIZE (IS42S16400J_SIZE/4)
uint32_t *pSDRAM;


void SDRAM_Check(void);

/* USER CODE END Includes */



/* USER CODE BEGIN 4 */



void SDRAM_Check(void)
{
  pSDRAM=(uint32_t*)SDRAM_BANK_ADDR;
    count=0;
    printf("开始写入SDRAM\r\n");
    for(sdram_count=0;sdram_count<SDRAM_SIZE;sdram_count++)
    {
        *pSDRAM=RadomBuffer[count];
        count++;
        pSDRAM++;
        if(count>=10000)

        {
            count=0;
        }
    }
    printf("写入总字节数:%d\r\n",(uint32_t)pSDRAM-SDRAM_BANK_ADDR);

    count=0;
    pSDRAM=(uint32_t*)SDRAM_BANK_ADDR;
    printf("开始读取SDRAM并与原随机数比较\r\n");
    sdram_count=0;
    for(;sdram_count<SDRAM_SIZE;sdram_count++)
    {
        if(*pSDRAM != RadomBuffer[count])
        {
            printf("数据比较错误——退出~\r\n");
            break;
        }
        count++;
        pSDRAM++;
        if(count>=10000)
        {
            count=0;
        }
    }

    printf("比较通过总字节数:%d\r\n",(uint32_t)pSDRAM-SDRAM_BANK_ADDR);

    if(sdram_count == SDRAM_SIZE)
    {
        LED_GREEN;
        printf("SDRAM测试成功\r\n");
    }
    else
    {
        LED_RED;
        printf("SDRAM测试失败\r\n");
    }   
}


/* USER CODE END 4 */

在 void main() 中添加相关函数

 /* USER CODE BEGIN 2 */

    SDRAM_InitSequence();//对SDRAM芯片进行初始化配置
    
    printf("\r\n野火STM32F429 SDRAM 读写测试例程\r\n");
    
    /*初始化RNG模块产生随机数*/
    hrng.Instance = RNG;
    HAL_RNG_Init(&hrng);
    
    printf("开始生成10000个SDRAM测试随机数\r\n");   
    for(count=0;count<10000;count++)

    {
        RadomBuffer[count]=HAL_RNG_GetRandomNumber(&hrng);
        
    }    
    printf("10000个SDRAM测试随机数生成完毕\r\n"); 
    
    
    SDRAM_Check();//测试读写10000个随机数，对比读写的数量

    
    
  /* USER CODE END 2 */