STM32U5A9NJH6Q使用160Mhz HSPI读取外部PSRAM失败

1万 · 2024-3-8 13:12

使用STM32U5A9NJH6Q操作外部PSRAM APS512XXN-OBR-BG，HSPI时钟源为主时钟160Mhz，当分频值设置为1也就是160/（1+1 ）= 80Mhz时能正常通信，但是分频值设置为0也就是160/（0+1 ）= 160Mhz时就没反应了。

```
hhspi->Instance = HSPI1;

  hhspi->Init.FifoThresholdByte    = 2U;
  hhspi->Init.MemoryMode             = HAL_XSPI_SINGLE_MEM;
  hhspi->Init.MemoryType             = HAL_XSPI_MEMTYPE_APMEM_16BITS;
  hhspi->Init.MemorySize             = (uint32_t)POSITION_VAL(APS512XX_RAM_SIZE);
  hhspi->Init.ChipSelectHighTimeCycle = 1U;//1U;
  hhspi->Init.FreeRunningClock       = HAL_XSPI_FREERUNCLK_DISABLE;
  hhspi->Init.ClockMode             = HAL_XSPI_CLOCK_MODE_0;
  hhspi->Init.WrapSize             = HAL_XSPI_WRAP_32_BYTES;
  hhspi->Init.ClockPrescaler       = 0;//1
  hhspi->Init.SampleShifting       = HAL_XSPI_SAMPLE_SHIFT_NONE;
  hhspi->Init.DelayHoldQuarterCycle = HAL_XSPI_DHQC_DISABLE;
  hhspi->Init.ChipSelectBoundary    = 11U;//11U;
  hhspi->Init.DelayBlockBypass       = HAL_XSPI_DELAY_BLOCK_ON;
  /* tCEM = 2 us max => REFRESH+4 clock cycles for read */
  hhspi->Init.Refresh                = ((2U * (hspi_clk / (Init->ClockPrescaler + 1U))) / 1000000U) - 4U;
  hhspi->Init.MaxTran                = 0U;
```