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stm32/sdram: Allow additional config by a board, and tune MPU settings.

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- Allow configuration by a board of autorefresh number and burst length.
- Increase MPU region size to 8MiB.
- Make SDRAM region cacheable and executable.
This commit is contained in:
forester3 2018-08-06 10:12:43 +09:00 committed by Damien George
parent b18fa1e606
commit e562f99263
1 changed files with 7 additions and 8 deletions
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15
ports/stm32/sdram.c
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@ -180,14 +180,14 @@ static void sdram_init_seq(SDRAM_HandleTypeDef
/* Step 6 : Configure a Auto-Refresh command */
command->CommandMode = FMC_SDRAM_CMD_AUTOREFRESH_MODE;
command->CommandTarget = FMC_SDRAM_CMD_TARGET_BANK;
command->AutoRefreshNumber = 4;
command->AutoRefreshNumber = MICROPY_HW_SDRAM_AUTOREFRESH_NUM;
command->ModeRegisterDefinition = 0;
/* Send the command */
HAL_SDRAM_SendCommand(hsdram, command, 0x1000);
/* Step 7: Program the external memory mode register */
tmpmrd = (uint32_t)SDRAM_MODEREG_BURST_LENGTH_2 |
tmpmrd = (uint32_t)FMC_INIT(SDRAM_MODEREG_BURST_LENGTH, MICROPY_HW_SDRAM_BURST_LENGTH) |
SDRAM_MODEREG_BURST_TYPE_SEQUENTIAL |
FMC_INIT(SDRAM_MODEREG_CAS_LATENCY, MICROPY_HW_SDRAM_CAS_LATENCY) |
SDRAM_MODEREG_OPERATING_MODE_STANDARD |
@ -222,19 +222,18 @@ static void sdram_init_seq(SDRAM_HandleTypeDef
/* Disable the MPU */
HAL_MPU_Disable();
/* Configure the MPU attributes for SDRAM */
/* Configure the MPU attributes as Write-Through for External SDRAM */
MPU_InitStruct.Enable = MPU_REGION_ENABLE;
MPU_InitStruct.BaseAddress = SDRAM_START_ADDRESS;
MPU_InitStruct.Size = MPU_REGION_SIZE_4MB;
MPU_InitStruct.Size = MPU_REGION_SIZE_8MB;
MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS;
MPU_InitStruct.IsBufferable = MPU_ACCESS_NOT_BUFFERABLE;
MPU_InitStruct.IsCacheable = MPU_ACCESS_NOT_CACHEABLE;
MPU_InitStruct.IsCacheable = MPU_ACCESS_CACHEABLE;
MPU_InitStruct.IsShareable = MPU_ACCESS_NOT_SHAREABLE;
MPU_InitStruct.Number = MPU_REGION_NUMBER0;
MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL1;
MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0;
MPU_InitStruct.SubRegionDisable = 0x00;
MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_DISABLE;
MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_ENABLE;
HAL_MPU_ConfigRegion(&MPU_InitStruct);
/* Enable the MPU */