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/*
* w9825g6kh6.c
*
* Created on: Aug 18, 2026
* Author: ozpv
*/
#include "fmc.h"
#include "w9825g6kh6.h"
void FMC_Init(void) {
/* USER CODE BEGIN FMC_Init 2 */
FMC_SDRAM_CommandTypeDef Command;
/* Step 1 and Step 2 already done in HAL_SDRAM_Init() */
/* Step 3: Configure a clock configuration enable command */
Command.CommandMode = FMC_SDRAM_CMD_CLK_ENABLE; /* Set MODE bits to "001" */
Command.CommandTarget = FMC_SDRAM_CMD_TARGET_BANK1; /* configure the Target Bank bits */
Command.AutoRefreshNumber = 1;
Command.ModeRegisterDefinition = 0;
HAL_SDRAM_SendCommand(&hsdram1, &Command, 0xfff);
/* Step 4: Insert 100 us minimum delay - Min HAL Delay is 1ms */
HAL_Delay(1);
/* Step 5: Configure a PALL (precharge all) command */
Command.CommandMode = FMC_SDRAM_CMD_PALL; /* Set MODE bits to "010" */
HAL_SDRAM_SendCommand(&hsdram1, &Command, 0xfff);
/* Step 6: Configure an Auto Refresh command */
Command.CommandMode = FMC_SDRAM_CMD_AUTOREFRESH_MODE; /* Set MODE bits to "011" */
Command.AutoRefreshNumber = 2;
HAL_SDRAM_SendCommand(&hsdram1, &Command, 0xfff);
/* Step 7: Program the external memory mode register */
Command.CommandMode = FMC_SDRAM_CMD_LOAD_MODE;/*set the MODE bits to "100" */
Command.ModeRegisterDefinition = (uint32_t)0 | 0<<3 | 2<<4 | 0<<7 | 1<<9;
HAL_SDRAM_SendCommand(&hsdram1, &Command, 0xfff);
/* Step 8: Set the refresh rate counter - refer to section SDRAM refresh timer register in RM0455 */
/* Set the device refresh rate
* COUNT = [(SDRAM self refresh time / number of row) x SDRAM CLK] – 20
= [(64ms/8192) * 100MHz] - 20 = floor(1562.5 - 20) = 761 */
HAL_SDRAM_ProgramRefreshRate(&hsdram1, 761);
/* USER CODE END FMC_Init 2 */
}
/* a test using address dependent values */
void SDRAM_Test(void) {
volatile uint32_t *sdram = (volatile uint32_t *)SDRAM_BASE;
for (uint32_t i = 0; i < SDRAM_SIZE / sizeof(uint32_t); ++i) {
sdram[i] = i ^ 0xDEADDEAD;
}
for (uint32_t i = 0; i < SDRAM_SIZE / sizeof(uint32_t); ++i) {
if (sdram[i] != (i ^ 0xDEADDEAD)) {
Error_Handler();
}
}
}
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