diff options
Diffstat (limited to 'stm-sdram.c')
| -rw-r--r-- | stm-sdram.c | 31 |
1 files changed, 25 insertions, 6 deletions
diff --git a/stm-sdram.c b/stm-sdram.c index 22fd8ab..8648d47 100644 --- a/stm-sdram.c +++ b/stm-sdram.c @@ -37,12 +37,29 @@ #include "stm-fmc.h"
#include "stm-led.h"
+/* Mode Register Bits */
+#define SDRAM_MODEREG_BURST_LENGTH_1 ((uint16_t)0x0000)
+#define SDRAM_MODEREG_BURST_LENGTH_2 ((uint16_t)0x0001)
+#define SDRAM_MODEREG_BURST_LENGTH_4 ((uint16_t)0x0002)
+#define SDRAM_MODEREG_BURST_LENGTH_8 ((uint16_t)0x0004)
+
+#define SDRAM_MODEREG_BURST_TYPE_SEQUENTIAL ((uint16_t)0x0000)
+#define SDRAM_MODEREG_BURST_TYPE_INTERLEAVED ((uint16_t)0x0008)
+
+#define SDRAM_MODEREG_CAS_LATENCY_2 ((uint16_t)0x0020)
+#define SDRAM_MODEREG_CAS_LATENCY_3 ((uint16_t)0x0030)
+
+#define SDRAM_MODEREG_OPERATING_MODE_STANDARD ((uint16_t)0x0000)
+
+#define SDRAM_MODEREG_WRITEBURST_MODE_PROGRAMMED ((uint16_t)0x0000)
+#define SDRAM_MODEREG_WRITEBURST_MODE_SINGLE ((uint16_t)0x0200)
+
SDRAM_HandleTypeDef hsdram1;
SDRAM_HandleTypeDef hsdram2;
-void _sdram_init_gpio(void);
-HAL_StatusTypeDef _sdram_init_fmc(void);
-HAL_StatusTypeDef _sdram_init_params(SDRAM_HandleTypeDef *sdram1, SDRAM_HandleTypeDef *sdram2);
+static void _sdram_init_gpio(void);
+static HAL_StatusTypeDef _sdram_init_fmc(void);
+static HAL_StatusTypeDef _sdram_init_params(SDRAM_HandleTypeDef *sdram1, SDRAM_HandleTypeDef *sdram2);
HAL_StatusTypeDef sdram_init(void)
@@ -74,7 +91,7 @@ HAL_StatusTypeDef sdram_init(void) return HAL_OK;
}
-void _sdram_init_gpio(void)
+static void _sdram_init_gpio(void)
{
GPIO_InitTypeDef GPIO_InitStruct;
@@ -90,7 +107,7 @@ void _sdram_init_gpio(void) fmc_af_gpio(GPIOI, GPIO_PIN_4 | GPIO_PIN_5);
}
-HAL_StatusTypeDef _sdram_init_fmc()
+static HAL_StatusTypeDef _sdram_init_fmc()
{
HAL_StatusTypeDef status;
FMC_SDRAM_TimingTypeDef SdramTiming;
@@ -179,11 +196,13 @@ HAL_StatusTypeDef _sdram_init_fmc() return HAL_SDRAM_Init(&hsdram2, &SdramTiming);
}
-HAL_StatusTypeDef _sdram_init_params(SDRAM_HandleTypeDef *sdram1, SDRAM_HandleTypeDef *sdram2)
+static HAL_StatusTypeDef _sdram_init_params(SDRAM_HandleTypeDef *sdram1, SDRAM_HandleTypeDef *sdram2)
{
HAL_StatusTypeDef ok; // status
FMC_SDRAM_CommandTypeDef cmd; // command
+#define HAL_Delay(n) for (int i = 0; i < 1000 * n; ++i)
+
/*
* enable clocking
*/
|