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STM32F427 HAL SDRAM Init

Hello Community,

i have the problem, that i have no idea how i could initialize the SDRAM with the HAL-Functions for STM32F42xx.

The correct chip is STM32F427-IGH6. My problem is that i could not initialize the external SDRAM with the HAL Functions. What did i wrong?


int main(void)
{
    /* STM32F4xx HAL library initialization:
         - Configure the Flash prefetch, instruction and Data caches
         - Configure the Systick to generate an interrupt each 1 msec
         - Set NVIC Group Priority to 4
         - Global MSP (MCU Support Package) initialization
     */
    HAL_Init();

    //Configure the System clock to have a frequency of 180 MHz
    SystemClock_Config();

    //Initialize OS
    OS_IncDI();                      // Initially disable interrupts
    OS_InitKern();                   // Initialize OS
    OS_InitHW();                     // Initialize Hardware for OS
    OS_DecRI();                      // Enable interrupts
    Trace_Init();                    // Initialize embOS-Trace

    //initialize peripherals
    InitPeripherals();


                FMC_SDRAM_InitTypeDef ini;
                ini.SDBank = FMC_SDRAM_BANK2;
                ini.ColumnBitsNumber = FMC_SDRAM_COLUMN_BITS_NUM_8;
                ini.RowBitsNumber = FMC_SDRAM_ROW_BITS_NUM_12;
                ini.MemoryDataWidth = FMC_SDRAM_MEM_BUS_WIDTH_16;
                ini.InternalBankNumber = FMC_SDRAM_INTERN_BANKS_NUM_4;
                ini.CASLatency = FMC_SDRAM_CAS_LATENCY_3;
                ini.WriteProtection = FMC_SDRAM_WRITE_PROTECTION_DISABLE;
                ini.SDClockPeriod = FMC_SDRAM_CLOCK_PERIOD_2;
                ini.ReadBurst = FMC_SDRAM_RBURST_DISABLE;
                ini.ReadPipeDelay = FMC_SDRAM_RPIPE_DELAY_1;

                FMC_SDRAM_Init(FMC_Bank5_6,&ini);

I think after the FMC_SDRAM_Init - the SDRAM should work? I did a SDRAM Sample without the HAL-Functions and it worked fine - but now i would use this Functions and i have no idea which kind of functions i should call and use. I also have no idea about the First-Parameter of FMC_SDRAM_Init - There should be FMC_Bank5_6_TypeDef, but with which configuration?

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0 Lukas Adler over 8 years ago

I changed the code. Is this correct now?
I'm not sure about the initialization with the HAL Functions

                  SDRAM_HandleTypeDef hdsram;
                hdsram.Init.SDBank = FMC_SDRAM_BANK2;
                hdsram.Init.ColumnBitsNumber = FMC_SDRAM_COLUMN_BITS_NUM_8;
                hdsram.Init.RowBitsNumber = FMC_SDRAM_ROW_BITS_NUM_12;
                hdsram.Init.MemoryDataWidth = FMC_SDRAM_MEM_BUS_WIDTH_16;
                hdsram.Init.InternalBankNumber = FMC_SDRAM_INTERN_BANKS_NUM_4;
                hdsram.Init.CASLatency = FMC_SDRAM_CAS_LATENCY_3;
                hdsram.Init.WriteProtection = FMC_SDRAM_WRITE_PROTECTION_DISABLE;
                hdsram.Init.SDClockPeriod = FMC_SDRAM_CLOCK_PERIOD_2;
                hdsram.Init.ReadBurst = FMC_SDRAM_RBURST_DISABLE;
                hdsram.Init.ReadPipeDelay = FMC_SDRAM_RPIPE_DELAY_1;
                hdsram.Instance = FMC_SDRAM_DEVICE;

                FMC_SDRAM_TimingTypeDef timing;
                timing.LoadToActiveDelay = 2;
                timing.ExitSelfRefreshDelay = 7;
                timing.SelfRefreshTime = 4;
                timing.RowCycleDelay =7;
                timing.WriteRecoveryTime = 2;
                timing.RPDelay = 2;
                timing.RCDDelay = 2;


                HAL_SDRAM_Init(&hdsram,&timing);

Greetings

Reply

0 Lukas Adler over 8 years ago

I changed the code. Is this correct now?
I'm not sure about the initialization with the HAL Functions

                  SDRAM_HandleTypeDef hdsram;
                hdsram.Init.SDBank = FMC_SDRAM_BANK2;
                hdsram.Init.ColumnBitsNumber = FMC_SDRAM_COLUMN_BITS_NUM_8;
                hdsram.Init.RowBitsNumber = FMC_SDRAM_ROW_BITS_NUM_12;
                hdsram.Init.MemoryDataWidth = FMC_SDRAM_MEM_BUS_WIDTH_16;
                hdsram.Init.InternalBankNumber = FMC_SDRAM_INTERN_BANKS_NUM_4;
                hdsram.Init.CASLatency = FMC_SDRAM_CAS_LATENCY_3;
                hdsram.Init.WriteProtection = FMC_SDRAM_WRITE_PROTECTION_DISABLE;
                hdsram.Init.SDClockPeriod = FMC_SDRAM_CLOCK_PERIOD_2;
                hdsram.Init.ReadBurst = FMC_SDRAM_RBURST_DISABLE;
                hdsram.Init.ReadPipeDelay = FMC_SDRAM_RPIPE_DELAY_1;
                hdsram.Instance = FMC_SDRAM_DEVICE;

                FMC_SDRAM_TimingTypeDef timing;
                timing.LoadToActiveDelay = 2;
                timing.ExitSelfRefreshDelay = 7;
                timing.SelfRefreshTime = 4;
                timing.RowCycleDelay =7;
                timing.WriteRecoveryTime = 2;
                timing.RPDelay = 2;
                timing.RCDDelay = 2;


                HAL_SDRAM_Init(&hdsram,&timing);

Greetings

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