void SDRAM_Init(void)
{
/* SDRAM device configuration */
sdramHandle.Instance = FMC_SDRAM_DEVICE;
/* Timing configuration for 100Mhz as SD clock frequency (System clock is up to 200Mhz) */
Timing.LoadToActiveDelay = 2;
Timing.ExitSelfRefreshDelay = 7;
Timing.SelfRefreshTime = 4;
Timing.RowCycleDelay = 7;
Timing.WriteRecoveryTime = 2;
Timing.RPDelay = 2;
Timing.RCDDelay = 2;
sdramHandle.Init.SDBank = FMC_SDRAM_BANK1;
sdramHandle.Init.ColumnBitsNumber = FMC_SDRAM_COLUMN_BITS_NUM_8;
sdramHandle.Init.RowBitsNumber = FMC_SDRAM_ROW_BITS_NUM_12;
sdramHandle.Init.MemoryDataWidth = SDRAM_MEMORY_WIDTH;
sdramHandle.Init.InternalBankNumber = FMC_SDRAM_INTERN_BANKS_NUM_4;
sdramHandle.Init.CASLatency = FMC_SDRAM_CAS_LATENCY_2;
sdramHandle.Init.WriteProtection = FMC_SDRAM_WRITE_PROTECTION_DISABLE;
sdramHandle.Init.SDClockPeriod = SDCLOCK_PERIOD;
sdramHandle.Init.ReadBurst = FMC_SDRAM_RBURST_ENABLE;
sdramHandle.Init.ReadPipeDelay = FMC_SDRAM_RPIPE_DELAY_0;
/* SDRAM controller initialization */
SDRAM_MspInit(&sdramHandle, NULL);
HAL_SDRAM_Init(&sdramHandle, &Timing);
SDRAM_Initialization_sequence(REFRESH_COUNT);
}
/**
* @brief Initializes the SDRAM device.
* @retval SDRAM status
*/
rt_err_t sdram_hw_init(void)
{
static uint8_t sdramstatus = RT_ERROR;
/* SDRAM device configuration */
sdramHandle.Instance = FMC_SDRAM_DEVICE;
/* Timing configuration for 100Mhz as SD clock frequency (System clock is up to 200Mhz) */
Timing.LoadToActiveDelay = 2;
Timing.ExitSelfRefreshDelay = 7;
Timing.SelfRefreshTime = 4;
Timing.RowCycleDelay = 7;
Timing.WriteRecoveryTime = 2;
Timing.RPDelay = 2;
Timing.RCDDelay = 2;
sdramHandle.Init.SDBank = FMC_SDRAM_BANK1;
sdramHandle.Init.ColumnBitsNumber = FMC_SDRAM_COLUMN_BITS_NUM_8;
sdramHandle.Init.RowBitsNumber = FMC_SDRAM_ROW_BITS_NUM_12;
sdramHandle.Init.MemoryDataWidth = SDRAM_MEMORY_WIDTH;
sdramHandle.Init.InternalBankNumber = FMC_SDRAM_INTERN_BANKS_NUM_4;
sdramHandle.Init.CASLatency = FMC_SDRAM_CAS_LATENCY_2;
sdramHandle.Init.WriteProtection = FMC_SDRAM_WRITE_PROTECTION_DISABLE;
sdramHandle.Init.SDClockPeriod = SDCLOCK_PERIOD;
sdramHandle.Init.ReadBurst = FMC_SDRAM_RBURST_ENABLE;
sdramHandle.Init.ReadPipeDelay = FMC_SDRAM_RPIPE_DELAY_0;
/* SDRAM controller initialization */
SDRAM_MspInit(&sdramHandle, NULL); /* __weak function can be rewritten by the application */
if(HAL_SDRAM_Init(&sdramHandle, &Timing) != HAL_OK)
{
sdramstatus = RT_ERROR;
}
else
{
sdramstatus = RT_EOK;
}
/* SDRAM initialization sequence */
SDRAM_InitializationSequence(REFRESH_COUNT);
return sdramstatus;
}
