本帖最后由 hpdell 于 2019-5-3 17:37 编辑
请教下，关于 H7 LwIP 的 MPU 配置 ？
配置为：
A.
MPU_InitStruct.Number = MPU_REGION_NUMBER4;
MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0;
B.;
MPU_InitStruct.Number = MPU_REGION_NUMBER1;
MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL1;
上述配置，A ，程序工作完全正常，使用 FMC 作为 IO 扩展工作也正常
B ，使用 FMC 作为 IO 扩展工作没有反应，但是其他都工作正常
请教下，这是为何啊 ？？？？？？？
MPU_Region_InitTypeDef MPU_InitStruct;
/* Disable the MPU */
HAL_MPU_Disable();
/* Configure the MPU attributes as Device not cacheable
for ETH DMA descriptors */
MPU_InitStruct.Enable = MPU_REGION_ENABLE;
MPU_InitStruct.BaseAddress = 0x30040000;
MPU_InitStruct.Size = MPU_REGION_SIZE_256B;
MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS;
MPU_InitStruct.IsBufferable = MPU_ACCESS_BUFFERABLE; //MPU_ACCESS_BUFFERABLE
MPU_InitStruct.IsCacheable = MPU_ACCESS_NOT_CACHEABLE;
MPU_InitStruct.IsShareable = MPU_ACCESS_NOT_SHAREABLE;
MPU_InitStruct.Number = MPU_REGION_NUMBER4; //配置为 1 区类型 ，fmc 扩展 io 貌似不工作
MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0; //配置为 1 区类型 ，fmc 扩展 io 貌似不工作，目前只能配置0
MPU_InitStruct.SubRegionDisable = 0x00;
MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_ENABLE;
HAL_MPU_ConfigRegion(&MPU_InitStruct);
/* Configure the MPU attributes as Cacheable write through
for LwIP RAM heap which contains the Tx buffers */
MPU_InitStruct.Enable = MPU_REGION_ENABLE;
MPU_InitStruct.BaseAddress = 0x30044000;
MPU_InitStruct.Size = MPU_REGION_SIZE_16KB;
MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS;
MPU_InitStruct.IsBufferable = MPU_ACCESS_NOT_BUFFERABLE;
MPU_InitStruct.IsCacheable = MPU_ACCESS_CACHEABLE; //MPU_ACCESS_CACHEABLE
MPU_InitStruct.IsShareable = MPU_ACCESS_NOT_SHAREABLE;
MPU_InitStruct.Number = MPU_REGION_NUMBER6;
MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0; //这个必须设置为 0
MPU_InitStruct.SubRegionDisable = 0x00;
MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_ENABLE;
HAL_MPU_ConfigRegion(&MPU_InitStruct);
/* Enable the MPU */
HAL_MPU_Enable(MPU_PRIVILEGED_DEFAULT); |
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