/**
* @brief Programs the SDRAM device.
* @param RefreshCount: SDRAM refresh counter value
* @retval None
*/
static void SDRAM_InitializationSequence(uint32_t RefreshCount)
{
__IO uint32_t tmpmrd = 0;
/* Step 1: Configure a clock configuration enable command */
Command.CommandMode = FMC_SDRAM_CMD_CLK_ENABLE;
Command.CommandTarget = FMC_SDRAM_CMD_TARGET_BANK1;
Command.AutoRefreshNumber = 1;
Command.ModeRegisterDefinition = 0;
/* Send the command */
HAL_SDRAM_SendCommand(&sdramHandle, &Command, SDRAM_TIMEOUT);
/* Step 2: Insert 100 us minimum delay */
/* Inserted delay is equal to 1 ms due to systick time base unit (ms) */
// HAL_Delay(1);
/* interrupt is not enable, just to delay some time. */
for (tmpmrd = 0; tmpmrd < 0xfffff; tmpmrd ++)
;
/* Step 3: Configure a PALL (precharge all) command */
Command.CommandMode = FMC_SDRAM_CMD_PALL;
Command.CommandTarget = FMC_SDRAM_CMD_TARGET_BANK1;
Command.AutoRefreshNumber = 1;
Command.ModeRegisterDefinition = 0;
/* Send the command */
HAL_SDRAM_SendCommand(&sdramHandle, &Command, SDRAM_TIMEOUT);
/* Step 4: Configure an Auto Refresh command */
Command.CommandMode = FMC_SDRAM_CMD_AUTOREFRESH_MODE;
Command.CommandTarget = FMC_SDRAM_CMD_TARGET_BANK1;
Command.AutoRefreshNumber = 8;
Command.ModeRegisterDefinition = 0;
/* Send the command */
HAL_SDRAM_SendCommand(&sdramHandle, &Command, SDRAM_TIMEOUT);
/* Step 5: Program the external memory mode register */
tmpmrd = (uint32_t)SDRAM_MODEREG_BURST_LENGTH_1 |\
SDRAM_MODEREG_BURST_TYPE_SEQUENTIAL |\
SDRAM_MODEREG_CAS_LATENCY_2 |\
SDRAM_MODEREG_OPERATING_MODE_STANDARD |\
SDRAM_MODEREG_WRITEBURST_MODE_SINGLE;
Command.CommandMode = FMC_SDRAM_CMD_LOAD_MODE;
Command.CommandTarget = FMC_SDRAM_CMD_TARGET_BANK1;
Command.AutoRefreshNumber = 1;
Command.ModeRegisterDefinition = tmpmrd;
/* Send the command */
HAL_SDRAM_SendCommand(&sdramHandle, &Command, SDRAM_TIMEOUT);
/* Step 6: Set the refresh rate counter */
/* Set the device refresh rate */
HAL_SDRAM_ProgramRefreshRate(&sdramHandle, RefreshCount);
}
/**
* @brief Programs the SDRAM device.
* @param RefreshCount: SDRAM refresh counter value
* @retval None
*/
static void BSP_SDRAM_Initialization_sequence(uint32_t RefreshCount,
uint32_t CasLatency)
{
__IO uint32_t tmpmrd = 0;
FMC_SDRAM_CommandTypeDef Command;
/* Step 1: Configure a clock configuration enable command */
Command.CommandMode = FMC_SDRAM_CMD_CLK_ENABLE;
Command.CommandTarget = FMC_SDRAM_CMD_TARGET_BANK1;
Command.AutoRefreshNumber = 1;
Command.ModeRegisterDefinition = 0;
/* Send the command */
HAL_SDRAM_SendCommand(&sdramHandle, &Command, SDRAM_TIMEOUT);
/* Step 2: Insert 100 us minimum delay */
spin(1000);
/* Step 3: Configure a PALL (precharge all) command */
Command.CommandMode = FMC_SDRAM_CMD_PALL;
Command.CommandTarget = FMC_SDRAM_CMD_TARGET_BANK1;
Command.AutoRefreshNumber = 1;
Command.ModeRegisterDefinition = 0;
/* Send the command */
HAL_SDRAM_SendCommand(&sdramHandle, &Command, SDRAM_TIMEOUT);
/* Step 4: Configure an Auto Refresh command */
Command.CommandMode = FMC_SDRAM_CMD_AUTOREFRESH_MODE;
Command.CommandTarget = FMC_SDRAM_CMD_TARGET_BANK1;
Command.AutoRefreshNumber = 8;
Command.ModeRegisterDefinition = 0;
/* Send the command */
HAL_SDRAM_SendCommand(&sdramHandle, &Command, SDRAM_TIMEOUT);
/* Step 5: Program the external memory mode register */
tmpmrd = (uint32_t)SDRAM_MODEREG_BURST_LENGTH_1 |\
SDRAM_MODEREG_BURST_TYPE_SEQUENTIAL |\
SDRAM_MODEREG_OPERATING_MODE_STANDARD |\
SDRAM_MODEREG_WRITEBURST_MODE_SINGLE;
tmpmrd |= CasLatency;
Command.CommandMode = FMC_SDRAM_CMD_LOAD_MODE;
Command.CommandTarget = FMC_SDRAM_CMD_TARGET_BANK1;
Command.AutoRefreshNumber = 1;
Command.ModeRegisterDefinition = tmpmrd;
/* Send the command */
HAL_SDRAM_SendCommand(&sdramHandle, &Command, SDRAM_TIMEOUT);
/* Step 6: Set the refresh rate counter */
/* Set the device refresh rate */
HAL_SDRAM_ProgramRefreshRate(&sdramHandle, RefreshCount);
}
static void sdram_init_seq(SDRAM_HandleTypeDef
*hsdram, FMC_SDRAM_CommandTypeDef *command)
{
/* Program the SDRAM external device */
__IO uint32_t tmpmrd =0;
/* Step 3: Configure a clock configuration enable command */
command->CommandMode = FMC_SDRAM_CMD_CLK_ENABLE;
command->CommandTarget = FMC_SDRAM_CMD_TARGET_BANK1;
command->AutoRefreshNumber = 1;
command->ModeRegisterDefinition = 0;
/* Send the command */
HAL_SDRAM_SendCommand(hsdram, command, 0x1000);
/* Step 4: Insert 100 ms delay */
HAL_Delay(100);
/* Step 5: Configure a PALL (precharge all) command */
command->CommandMode = FMC_SDRAM_CMD_PALL;
command->CommandTarget = FMC_SDRAM_CMD_TARGET_BANK1;
command->AutoRefreshNumber = 1;
command->ModeRegisterDefinition = 0;
/* Send the command */
HAL_SDRAM_SendCommand(hsdram, command, 0x1000);
/* Step 6 : Configure a Auto-Refresh command */
command->CommandMode = FMC_SDRAM_CMD_AUTOREFRESH_MODE;
command->CommandTarget = FMC_SDRAM_CMD_TARGET_BANK1;
command->AutoRefreshNumber = 4;
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 |
SDRAM_MODEREG_BURST_TYPE_SEQUENTIAL |
SDRAM_MODEREG_CAS_LATENCY_3 |
SDRAM_MODEREG_OPERATING_MODE_STANDARD |
SDRAM_MODEREG_WRITEBURST_MODE_SINGLE;
command->CommandMode = FMC_SDRAM_CMD_LOAD_MODE;
command->CommandTarget = FMC_SDRAM_CMD_TARGET_BANK1;
command->AutoRefreshNumber = 1;
command->ModeRegisterDefinition = tmpmrd;
/* Send the command */
HAL_SDRAM_SendCommand(hsdram, command, 0x1000);
/* Step 8: Set the refresh rate counter */
/* (15.62 us x Freq) - 20 */
/* Set the device refresh counter */
HAL_SDRAM_ProgramRefreshRate(hsdram, REFRESH_COUNT);
}
void BSP_SDRAM_Initialization_sequence(uint32_t RefreshCount)
{
__IO uint32_t tmpmrd =0;
/* Step 1: Configure a clock configuration enable command */
Command.CommandMode = FMC_SDRAM_CMD_CLK_ENABLE;
Command.CommandTarget = FMC_SDRAM_CMD_TARGET_BANK2;
Command.AutoRefreshNumber = 1;
Command.ModeRegisterDefinition = 0;
/* Send the command */
HAL_SDRAM_SendCommand(&hsdram1, &Command, 0xFFFF);
/* Step 2: Insert 100 us minimum delay */
/* Inserted delay is equal to 1 ms due to systick time base unit (ms) */
HAL_Delay(1);
/* Step 3: Configure a PALL (precharge all) command */
Command.CommandMode = FMC_SDRAM_CMD_PALL;
Command.CommandTarget = FMC_SDRAM_CMD_TARGET_BANK2;
Command.AutoRefreshNumber = 1;
Command.ModeRegisterDefinition = 0;
/* Send the command */
HAL_SDRAM_SendCommand(&hsdram1, &Command, 0xFFFF);
/* Step 4: Configure an Auto Refresh command */
Command.CommandMode = FMC_SDRAM_CMD_AUTOREFRESH_MODE;
Command.CommandTarget = FMC_SDRAM_CMD_TARGET_BANK2;
Command.AutoRefreshNumber = 4;
Command.ModeRegisterDefinition = 0;
/* Send the command */
HAL_SDRAM_SendCommand(&hsdram1, &Command, 0xFFFF);
/* Step 5: Program the external memory mode register */
tmpmrd = (uint32_t)0x0002 |
0 |
0x0030 |
0 |
0x0200;
Command.CommandMode = FMC_SDRAM_CMD_LOAD_MODE;
Command.CommandTarget = FMC_SDRAM_CMD_TARGET_BANK2;
Command.AutoRefreshNumber = 1;
Command.ModeRegisterDefinition = tmpmrd;
/* Send the command */
HAL_SDRAM_SendCommand(&hsdram1, &Command, 0xFFFF);
/* Step 6: Set the refresh rate counter */
/* Set the device refresh rate */
HAL_SDRAM_ProgramRefreshRate(&hsdram1, RefreshCount);
}
uint8_t TM_SDRAM_Init(void) {
SDRAM_HandleTypeDef SDRAMHandle;
FMC_SDRAM_TimingTypeDef Timing;
FMC_SDRAM_CommandTypeDef Command;
volatile uint32_t timeout = SDRAM_TIMEOUT;
static uint8_t initialized = 0;
/* Already initialized */
if (initialized) {
return 1;
}
/* Set instance */
SDRAMHandle.Instance = FMC_SDRAM_DEVICE;
/* Initialize FMC pins */
TM_SDRAM_InitPins();
/* Enable FMC clock */
__HAL_RCC_FMC_CLK_ENABLE();
/* FMC SDRAM device initialization sequence --------------------------------*/
/* Step 1 ----------------------------------------------------*/
/* Timing configuration for 90 Mhz of SD clock frequency (180Mhz/2) */
/* TMRD: 2 Clock cycles */
/* 1 clock cycle = 1 / 90MHz = 11.1ns */
Timing.LoadToActiveDelay = 2;
Timing.ExitSelfRefreshDelay = 7;
Timing.SelfRefreshTime = 4;
Timing.RowCycleDelay = 7;
Timing.WriteRecoveryTime = 2;
Timing.RPDelay = 2;
Timing.RCDDelay = 2;
/* FMC SDRAM control configuration */
SDRAMHandle.Init.SDBank = SDRAM_BANK;
SDRAMHandle.Init.ColumnBitsNumber = FMC_SDRAM_COLUMN_BITS_NUM_8;
SDRAMHandle.Init.RowBitsNumber = SDRAM_ROWBITS_NUMBER;
SDRAMHandle.Init.MemoryDataWidth = SDRAM_MEMORY_WIDTH;
SDRAMHandle.Init.InternalBankNumber = FMC_SDRAM_INTERN_BANKS_NUM_4;
SDRAMHandle.Init.CASLatency = SDRAM_CAS_LATENCY;
SDRAMHandle.Init.WriteProtection = FMC_SDRAM_WRITE_PROTECTION_DISABLE;
SDRAMHandle.Init.SDClockPeriod = FMC_SDRAM_CLOCK_PERIOD_2;
SDRAMHandle.Init.ReadBurst = SDRAM_READ_BURST_STATE;
SDRAMHandle.Init.ReadPipeDelay = FMC_SDRAM_RPIPE_DELAY_0;
/* FMC SDRAM bank initialization */
HAL_SDRAM_Init(&SDRAMHandle, &Timing);
/* SDRAM Init sequence */
/* Configure a clock configuration enable command */
Command.CommandMode = FMC_SDRAM_CMD_CLK_ENABLE;
Command.CommandTarget = SDRAM_COMMAND_TARGET_BANK;
Command.AutoRefreshNumber = 1;
Command.ModeRegisterDefinition = 0;
/* Send command */
HAL_SDRAM_SendCommand(&SDRAMHandle, &Command, SDRAM_TIMEOUT);
/* Little delay */
timeout = SDRAM_TIMEOUT * 0xF;
while (timeout--);
/* Configure a PALL (precharge all) command */
Command.CommandMode = FMC_SDRAM_CMD_PALL;
Command.CommandTarget = SDRAM_COMMAND_TARGET_BANK;
Command.AutoRefreshNumber = 1;
Command.ModeRegisterDefinition = 0;
/* Send the command */
HAL_SDRAM_SendCommand(&SDRAMHandle, &Command, SDRAM_TIMEOUT);
/* Configure a Auto-Refresh command */
Command.CommandMode = FMC_SDRAM_CMD_AUTOREFRESH_MODE;
Command.CommandTarget = SDRAM_COMMAND_TARGET_BANK;
Command.AutoRefreshNumber = 8;
Command.ModeRegisterDefinition = 0;
/* Send the command */
HAL_SDRAM_SendCommand(&SDRAMHandle, &Command, SDRAM_TIMEOUT);
/* Configure a load Mode register command */
Command.CommandMode = FMC_SDRAM_CMD_LOAD_MODE;
Command.CommandTarget = SDRAM_COMMAND_TARGET_BANK;
Command.AutoRefreshNumber = 1;
Command.ModeRegisterDefinition = (uint32_t)SDRAM_REG_VALUE;
/* Wait until the SDRAM controller is ready */
/* Send the command */
HAL_SDRAM_SendCommand(&SDRAMHandle, &Command, SDRAM_TIMEOUT);
/* Step 6: Set the refresh rate counter */
/* Set the device refresh rate */
HAL_SDRAM_ProgramRefreshRate(&SDRAMHandle, SDRAM_REFRESH_COUNT);
/* Little delay */
timeout = SDRAM_TIMEOUT * 0xF;
while (timeout--);
/* Check if everything goes right */
/* Write 0x45 at location 0x50 and check if result is the same on read operation */
TM_SDRAM_Write8(0x50, 0x45);
/* Read and check */
if (TM_SDRAM_Read8(0x50) == 0x45) {
/* Initialized OK */
initialized = 1;
/* Initialized OK */
return 1;
}
/* Not initialized OK */
initialized = 0;
/* Not ok */
return 0;
}