bool Init_SDRAM_Device()
{
SDRAM_GPIO_Init(&hsdram);
/* SDRAM device configuration */
hsdram.Instance = FMC_SDRAM_DEVICE;
/* Timing configuration for 90 MHz of SD clock frequency (180MHz/2) */
/* TMRD: 2 Clock cycles */
SDRAM_Timing.LoadToActiveDelay = 2;
/* TXSR: min=70ns (6x11.90ns) */
SDRAM_Timing.ExitSelfRefreshDelay = 7;
/* TRAS: min=42ns (4x11.90ns) max=120k (ns) */
SDRAM_Timing.SelfRefreshTime = 4;
/* TRC: min=63 (6x11.90ns) */
SDRAM_Timing.RowCycleDelay = 7;
/* TWR: 2 Clock cycles */
SDRAM_Timing.WriteRecoveryTime = 2;
/* TRP: 15ns => 2x11.90ns */
SDRAM_Timing.RPDelay = 2;
/* TRCD: 15ns => 2x11.90ns */
SDRAM_Timing.RCDDelay = 2;
hsdram.Init.SDBank = FMC_SDRAM_BANK2;
hsdram.Init.ColumnBitsNumber = FMC_SDRAM_COLUMN_BITS_NUM_8;
hsdram.Init.RowBitsNumber = FMC_SDRAM_ROW_BITS_NUM_12;
hsdram.Init.MemoryDataWidth = SDRAM_MEMORY_WIDTH;
hsdram.Init.InternalBankNumber = FMC_SDRAM_INTERN_BANKS_NUM_4;
hsdram.Init.CASLatency = FMC_SDRAM_CAS_LATENCY_3;
hsdram.Init.WriteProtection = FMC_SDRAM_WRITE_PROTECTION_DISABLE;
hsdram.Init.SDClockPeriod = SDCLOCK_PERIOD;
hsdram.Init.ReadBurst = FMC_SDRAM_RBURST_DISABLE;
hsdram.Init.ReadPipeDelay = FMC_SDRAM_RPIPE_DELAY_1;
/* Initialize the SDRAM controller */
if(HAL_SDRAM_Init(&hsdram, &SDRAM_Timing) != HAL_OK)
{
/* Initialization Error */
return false;
}
/* Program the SDRAM external device */
SDRAM_Initialization_Sequence(&hsdram, &command);
return true;
}
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
/* STM32F4xx HAL library initialization:
- Configure the Flash prefetch, instruction and Data caches
- Systick timer is configured by default as source of time base, but user
can eventually implement his proper time base source (a general purpose
timer for example or other time source), keeping in mind that Time base
duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and
handled in milliseconds basis.
- Set NVIC Group Priority to 4
- Low Level Initialization: global MSP (MCU Support Package) initialization
*/
HAL_Init();
/* Configure the system clock to 180 MHz */
SystemClock_Config();
/* Configure LED1 and LED3 */
BSP_LED_Init(LED1);
BSP_LED_Init(LED3);
/*##-1- Configure the SDRAM device #########################################*/
/* SDRAM device configuration */
hsdram.Instance = FMC_SDRAM_DEVICE;
SDRAM_Timing.LoadToActiveDelay = 2;
SDRAM_Timing.ExitSelfRefreshDelay = 6;
SDRAM_Timing.SelfRefreshTime = 4;
SDRAM_Timing.RowCycleDelay = 6;
SDRAM_Timing.WriteRecoveryTime = 2;
SDRAM_Timing.RPDelay = 2;
SDRAM_Timing.RCDDelay = 2;
hsdram.Init.SDBank = FMC_SDRAM_BANK1;
hsdram.Init.ColumnBitsNumber = FMC_SDRAM_COLUMN_BITS_NUM_8;
hsdram.Init.RowBitsNumber = FMC_SDRAM_ROW_BITS_NUM_12;
hsdram.Init.MemoryDataWidth = SDRAM_MEMORY_WIDTH;
hsdram.Init.InternalBankNumber = FMC_SDRAM_INTERN_BANKS_NUM_4;
hsdram.Init.CASLatency = FMC_SDRAM_CAS_LATENCY_2;
hsdram.Init.WriteProtection = FMC_SDRAM_WRITE_PROTECTION_DISABLE;
hsdram.Init.SDClockPeriod = SDCLOCK_PERIOD;
hsdram.Init.ReadBurst = FMC_SDRAM_RBURST_ENABLE;
hsdram.Init.ReadPipeDelay = FMC_SDRAM_RPIPE_DELAY_0;
/* Initialize the SDRAM controller */
if(HAL_SDRAM_Init(&hsdram, &SDRAM_Timing) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
/* Program the SDRAM external device */
SDRAM_Initialization_Sequence(&hsdram, &command);
/*##-2- SDRAM memory read/write access #####################################*/
/* Fill the buffer to write */
Fill_Buffer(aTxBuffer, BUFFER_SIZE, 0xA244250F);
/* Write data to the SDRAM memory */
for (uwIndex = 0; uwIndex < BUFFER_SIZE; uwIndex++)
{
*(__IO uint32_t*) (SDRAM_BANK_ADDR + WRITE_READ_ADDR + 4*uwIndex) = aTxBuffer[uwIndex];
}
/* Read back data from the SDRAM memory */
for (uwIndex = 0; uwIndex < BUFFER_SIZE; uwIndex++)
{
aRxBuffer[uwIndex] = *(__IO uint32_t*) (SDRAM_BANK_ADDR + WRITE_READ_ADDR + 4*uwIndex);
}
/*##-3- Checking data integrity ############################################*/
for (uwIndex = 0; (uwIndex < BUFFER_SIZE) && (uwWriteReadStatus == 0); uwIndex++)
{
if (aRxBuffer[uwIndex] != aTxBuffer[uwIndex])
{
uwWriteReadStatus++;
}
}
if (uwWriteReadStatus != PASSED)
{
/* KO, turn on LED3 */
BSP_LED_On(LED3);
}
else
{
/* OK, turn on LED1 */
BSP_LED_On(LED1);
}
/* Infinite loop */
while (1)
{
}
}
/**
* @brief Main program
* @param None
* @retval None
*/
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 LED3 and LED4 */
BSP_LED_Init(LED3);
BSP_LED_Init(LED4);
// Turn LEDs off to indicate start of bootloader
// and to reset previous state.
BSP_LED_Off(LED3);
BSP_LED_Off(LED4);
/* Configure the system clock to 180 MHz */
SystemClock_Config();
uartInit();
printf( "Initializing SDRAM\r\n" );
/*##-1- Configure the SDRAM device #########################################*/
/* SDRAM device configuration */
hsdram.Instance = FMC_SDRAM_DEVICE;
/* Timing configuration for 90 MHz of SD clock frequency (180MHz/2) */
/* TMRD: 2 Clock cycles */
SDRAM_Timing.LoadToActiveDelay = 2;
/* TXSR: min=70ns (6x11.90ns) */
SDRAM_Timing.ExitSelfRefreshDelay = 7;
/* TRAS: min=42ns (4x11.90ns) max=120k (ns) */
SDRAM_Timing.SelfRefreshTime = 4;
/* TRC: min=63 (6x11.90ns) */
SDRAM_Timing.RowCycleDelay = 7;
/* TWR: 2 Clock cycles */
SDRAM_Timing.WriteRecoveryTime = 2;
/* TRP: 15ns => 2x11.90ns */
SDRAM_Timing.RPDelay = 2;
/* TRCD: 15ns => 2x11.90ns */
SDRAM_Timing.RCDDelay = 2;
hsdram.Init.SDBank = FMC_SDRAM_BANK2;
hsdram.Init.ColumnBitsNumber = FMC_SDRAM_COLUMN_BITS_NUM_8;
hsdram.Init.RowBitsNumber = FMC_SDRAM_ROW_BITS_NUM_12;
hsdram.Init.MemoryDataWidth = SDRAM_MEMORY_WIDTH;
hsdram.Init.InternalBankNumber = FMC_SDRAM_INTERN_BANKS_NUM_4;
hsdram.Init.CASLatency = FMC_SDRAM_CAS_LATENCY_3;
hsdram.Init.WriteProtection = FMC_SDRAM_WRITE_PROTECTION_DISABLE;
hsdram.Init.SDClockPeriod = SDCLOCK_PERIOD;
hsdram.Init.ReadBurst = FMC_SDRAM_RBURST_DISABLE;
hsdram.Init.ReadPipeDelay = FMC_SDRAM_RPIPE_DELAY_1;
/* Initialize the SDRAM controller */
if(HAL_SDRAM_Init(&hsdram, &SDRAM_Timing) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
/* Program the SDRAM external device */
SDRAM_Initialization_Sequence(&hsdram, &command);
/*##-2- SDRAM memory read/write access #####################################*/
printf( "Filling SDRAM\r\n" );
/* Fill the buffer to write */
Fill_Buffer(aTxBuffer, BUFFER_SIZE, 0xA244250F);
/* Write data to the SDRAM memory */
for (uwIndex = 0; uwIndex < BUFFER_SIZE; uwIndex++)
{
*(__IO uint32_t*) (SDRAM_BANK_ADDR + WRITE_READ_ADDR + 4*uwIndex) = aTxBuffer[uwIndex];
}
printf( "Reading back SDRAM data\r\n" );
/* Read back data from the SDRAM memory */
for (uwIndex = 0; uwIndex < BUFFER_SIZE; uwIndex++)
{
aRxBuffer[uwIndex] = *(__IO uint32_t*) (SDRAM_BANK_ADDR + WRITE_READ_ADDR + 4*uwIndex);
}
/*##-3- Checking data integrity ############################################*/
printf( "Checking data integrity\r\n" );
for (uwIndex = 0; (uwIndex < BUFFER_SIZE) && (uwWriteReadStatus == 0); uwIndex++)
{
if (aRxBuffer[uwIndex] != aTxBuffer[uwIndex])
{
uwWriteReadStatus++;
}
}
if (uwWriteReadStatus)
{
/* KO */
/* Turn on LED4 */
BSP_LED_On(LED4);
}
else
{
/* OK */
/* Turn on LED3 */
BSP_LED_On(LED3);
}
start_kernel();
/* Infinite loop */
while (1)
{
}
}
