STM32H750 QSPI内存映射模式不能随机访问

只看该作者 · 2021-6-27 22:46

我在使用W25Q128FV这个flash，stm32h750， qspi能读能写，数据OK，但是使用HAL_QSPI_MemoryMapped内存映射后，从地址0x9000000直接读取数据也正常，但是我想随意定一个地址开始读取数据，比如从0x90001000开始读取，就发现全是FF。按理说这个地址也在flash范围以内啊？这是个bug么？

只看该作者 · 2021-6-27 22:48

下面是我的内存映射代码：uint32_t QSPI_EnableMemoryMappedMode()
{
QSPI_CommandTypeDef    s_command;
  QSPI_MemoryMappedTypeDef s_mem_mapped_cfg;

  /* Configure the command for the read instruction */
  s_command.InstructionMode = QSPI_INSTRUCTION_1_LINE;
  s_command.Instruction    =  Fast_Read_Quad;
  s_command.AddressMode    = QSPI_ADDRESS_4_LINES;
  s_command.AddressSize    = QSPI_ADDRESS_24_BITS;
  s_command.AlternateByteMode = QSPI_ALTERNATE_BYTES_NONE;
  s_command.DataMode       = QSPI_DATA_4_LINES;
  s_command.DummyCycles    = 26;
  s_command.DdrMode          = QSPI_DDR_MODE_DISABLE;
  s_command.DdrHoldHalfCycle  = QSPI_DDR_HHC_HALF_CLK_DELAY;
  s_command.SIOOMode       = QSPI_SIOO_INST_EVERY_CMD;
s_command.Address = 0;
s_command.NbData          = 2;

  /* Configure the memory mapped mode */
  s_mem_mapped_cfg.TimeOutActivation = QSPI_TIMEOUT_COUNTER_DISABLE;
  s_mem_mapped_cfg.TimeOutPeriod    = 0;

  return HAL_QSPI_MemoryMapped(&hqspi, &s_command, &s_mem_mapped_cfg);
}