使用STM32H743II FMC访问外部SRAM时序问题

2020-01-07 19:19发布

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8条回答

cht-rtos

1楼-- · 2020-01-08 01:15

配置成了按字节访问了吧，然后指针类型又是4字节的

smaret

2楼-- · 2020-01-08 15:28

搞好了，　需要配置MPU
//MPU related define
#define FPGA_ADDRESS_START (0x60000000UL)
#define FPGA_SIZE MPU_REGION_SIZE_64MB
#define FPGA_REGION_NUMBER MPU_REGION_NUMBER0
#define FPGA_ACCESS_PERMISSION MPU_REGION_FULL_ACCESS
void MPU_Config(void)
{
MPU_Region_InitTypeDef MPU_InitStruct;
/* Disable MPU */
HAL_MPU_Disable();
/* Configure FPGA region as Region N?, 64MB of size and R/W region */
MPU_InitStruct.Enable = MPU_REGION_ENABLE;
MPU_InitStruct.BaseAddress = FPGA_ADDRESS_START;
MPU_InitStruct.Size = FPGA_SIZE;
MPU_InitStruct.AccessPermission = FPGA_ACCESS_PERMISSION;
MPU_InitStruct.IsBufferable = MPU_ACCESS_NOT_BUFFERABLE;
MPU_InitStruct.IsCacheable = MPU_ACCESS_NOT_CACHEABLE;
MPU_InitStruct.IsShareable = MPU_ACCESS_NOT_SHAREABLE;
MPU_InitStruct.Number = FPGA_REGION_NUMBER;
MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0;
MPU_InitStruct.SubRegionDisable = 0x00;
MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_DISABLE;
HAL_MPU_ConfigRegion(&MPU_InitStruct);
/* Enable MPU */
HAL_MPU_Enable(MPU_PRIVILEGED_DEFAULT);
}