大神看看我的这个sdram 读写速度如何啊？？？

hpdell · 发表于 2016-11-1 12:14:51

SDRAM Test 8Bit Data Write Start ...[2016-10-28 07:14:41.350]          // 表示写入开始
SDRAM Test 8Bit Data Begin Check ...[2016-10-28 07:14:47.760]       // 6.41 表示写入完成用时读开始
SDRAM Check Num = 0                [2016-10-28 07:14:53.587]          // 5.827    读取数据完成，以下类同

SDRAM Test 16Bit Data Write Start ...[2016-10-28 07:14:53.587]
SDRAM Test 16Bit Data Begin Check ...[2016-10-28 07:14:57.954]  // 4.367
SDRAM Check Num = 1                [2016-10-28 07:15:02.085]  // 4.131

SDRAM Test 32Bit Data Write Start ...[2016-10-28 07:15:02.085]
SDRAM Test 32Bit Data Begin Check ...[2016-10-28 07:15:04.077]  // 1.992
SDRAM Check Num = 2                [2016-10-28 07:15:05.959]  // 1.882

---------------------------------------------------------------------
SDRAM Test 8Bit Data Write Start ...[2016-10-29 08:00:17.771]
SDRAM Test 8Bit Data Begin Check ...[2016-10-29 08:00:24.179] // 6.408
SDRAM Check Num = 0                [2016-10-29 08:00:30.009] // 5.83

SDRAM Test 16Bit Data Write Start ...[2016-10-29 08:00:30.009]
SDRAM Test 16Bit Data Begin Check ...[2016-10-29 08:00:34.377]  // 4.368
SDRAM Check Num = 1                [2016-10-29 08:00:38.456]  // 4

SDRAM Test 32Bit Data Write Start ...[2016-10-29 08:00:38.456]
SDRAM Test 32Bit Data Begin Check ...[2016-10-29 08:00:40.481]  // 2.025
SDRAM Check Num = 2                [2016-10-29 08:00:42.379]  // 1.898

----------------------------------------------------------------------------------------
SDRAM Test 8Bit Data Write Start ...[2016-10-29 08:01:06.998]
SDRAM Test 8Bit Data Begin Check ...[2016-10-29 08:01:13.421]  // 6.423
SDRAM Check Num = 6                [2016-10-29 08:01:19.247]  // 5.826

SDRAM Test 16Bit Data Write Start ...[2016-10-29 08:01:19.247]
SDRAM Test 16Bit Data Begin Check ...[2016-10-29 08:01:23.615]  // 4.368
SDRAM Check Num = 7                [2016-10-29 08:01:27.698]  // 4.083

SDRAM Test 32Bit Data Write Start ...[2016-10-29 08:01:27.698]
SDRAM Test 32Bit Data Begin Check ...[2016-10-29 08:01:29.737]  // 2.039
SDRAM Check Num = 8                [2016-10-29 08:01:31.618]  // 1.881

上述就是三次的读写测试时间，你看看效果如何啊？？

测试函数如下：

void SDRAM_Test_8bit(void)
{
  uint8_t  *ptrSdramAddr_8Bit = (uint8_t *)SDRAM_BASE_USER_ADDR; // 吧地址转换为指针

  uint32_t ii = 0;
  uint32_t jj=0;
  __IO uint8_t  SdramDataTest = 0 ;


  ptrSdramAddr_8Bit = (uint8_t *)SDRAM_BASE_USER_ADDR; // 吧地址转换为指针
  SdramDataTest = 0;

  printf("SDRAM Test 8Bit Data Write Start ...\r\n");
  for(ii=0;ii<0x7800000;ii++)
  {
*ptrSdramAddr_8Bit  = ( __IO uint8_t )(SdramDataTest);
SdramDataTest++;
ptrSdramAddr_8Bit ++;
  }

  SdramDataTest=0;
  ptrSdramAddr_8Bit = (uint8_t *)SDRAM_BASE_USER_ADDR;

  printf("SDRAM Test 8Bit Data Begin Check ...\r\n");
  for(ii=0;ii< 0x7800000;ii++)
  {
jj  = *ptrSdramAddr_8Bit++;
SdramDataTest++;
  }
  printf("SDRAM Check Num = %d\r\n\r\n", OkErrCnt++);

}

void SDRAM_Test_16bit(void)
{
  uint16_t  *ptrSdramAddr_16Bit = (uint16_t *)SDRAM_BASE_USER_ADDR;
  __IO uint32_t ii = 0;
  uint16_t  jj=0;
  __IO uint16_t  SdramDataTest = 0;

  ptrSdramAddr_16Bit = (uint16_t *)SDRAM_BASE_USER_ADDR; // 吧地址转换为指针
  SdramDataTest = 0;
  printf("SDRAM Test 16Bit Data Write Start ...\r\n");
  for(ii=0;ii<0x3C00000;ii++)  // 128MByte 1024*1024*32*4 = (128MByte - 8MByte) / 2 = 0x3C00000
  {
*ptrSdramAddr_16Bit  = ( __IO uint16_t )(SdramDataTest);
SdramDataTest++;
ptrSdramAddr_16Bit ++;
  }

  SdramDataTest=0;
  ptrSdramAddr_16Bit = (uint16_t *)SDRAM_BASE_USER_ADDR;
  printf("SDRAM Test 16Bit Data Begin Check ...\r\n");

  for(ii=0;ii< 0x3C00000;ii++)
  {
jj  = *ptrSdramAddr_16Bit ++;
SdramDataTest++;
  }

  printf("SDRAM Check Num = %d\r\n\r\n", OkErrCnt++);

}

void SDRAM_Test_32bit(void)
{
  uint32_t  *ptrSdramAddr_32Bit = (uint32_t *)(SDRAM_BASE_USER_ADDR);       // SDRAM_BASE_USER_ADDR;
  uint32_t jj=0;
  __IO uint32_t  ii = 0, SdramDataTest = 0;


  ptrSdramAddr_32Bit = (uint32_t *)(SDRAM_BASE_USER_ADDR); // 吧地址转换为指针
  SdramDataTest = 0;
  printf("SDRAM Test 32Bit Data Write Start ...\r\n");
  for(ii=0;ii<0x1E00000;ii++)  // 128MByte 1024*1024*32*4 = (128MByte - 8MByte) / 4 = 0x1E00000
  {
*ptrSdramAddr_32Bit  = ( __IO uint32_t )(SdramDataTest);
ptrSdramAddr_32Bit ++;
SdramDataTest++;
  }

  SdramDataTest=0;
  ptrSdramAddr_32Bit = (uint32_t *)SDRAM_BASE_USER_ADDR;
  printf("SDRAM Test 32Bit Data Begin Check ...\r\n");
  for(ii=0;ii< 0x1E00000;ii++)
  {
jj  = *ptrSdramAddr_32Bit++;
SdramDataTest++;
  }

  printf("SDRAM Check Num = %d\r\n\r\n", OkErrCnt++);

}