测试平台STM32L496,芯片支持最高主频80MHz,QSPI Flash最高支持104MHz,因此不分频,测试每次搬运1KB,2KB,4KB,8KB,测试内部Flash(双区模式),QSPI单芯片,QSPI双芯片模式,分别对比速度,开启全部Cache,使用FIFO和MemoryMap方式访问,校验数据有效.测试1GB传输.

测试代码:

https://github.com/nickfox-taterli/stm32l4_qspi_benchmark

int main(void)
{
  HAL_Init();

  SystemClock_Config();
  BSP_QSPI_Init();

  // 1KB 数据
  for(uint16_t i = 0;i < 0x400;i++){
    wData[i] = i;
    rData[i] = 0;
  }

  for(uint16_t i = 0;i < 16;i++){
    BSP_QSPI_Erase_Block(i);      
  }
  
  for(uint16_t i = 0;i < 16;i++){
    BSP_QSPI_Write(wData,0x400 * i,0x400);      
  }
  
  BSP_QSPI_MemoryMappedMode();
  
  HAL_Delay(5);
  
  time_start = HAL_GetTick();
  
  // 1GB 数据传输
  for(uint32_t i =0;i < (1024 * 1024) ;i++){
     memcpy(&rData,(void *)0x8000000,0x400);
  }
  
  time_end = HAL_GetTick();
  time_diff = time_end - time_start;
  
  while (time_diff)
  {
      
  }
}

速度测试(单位:秒):

内部Flash(0x8000000)单一QSPI(0x90000000)双区QSPI(0x90000000)1KB18.00327.70115.9172KB17.81327.27515.5514KB17.71827.06115.3088KB17.61726.99515.206

速度测试(单位:MB/s)

内部Flash(0x8000000)单一QSPI(0x90000000)双区QSPI(0x90000000)1KB56.8794089936.9661745164.333731232KB57.4861056537.5435380465.847855444KB57.7943334537.8404345766.893127788KB58.1256740637.9329505567.34183875

奇不奇怪,片外的连续性能居然更快,双区速度大概是1.75倍单一速度.