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micropython/ports/stm32/sdram.c

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/*
* This file is part of the OpenMV project.
* Copyright (c) 2013/2014 Ibrahim Abdelkader <i.abdalkader@gmail.com>
* This work is licensed under the MIT license, see the file LICENSE for details.
*
* SDRAM Driver.
*
*/
#include <stdio.h>
#include <stdbool.h>
#include <string.h>
#include "py/runtime.h"
#include "py/mphal.h"
#include "boardctrl.h"
#include "pin.h"
#include "pin_static_af.h"
#include "mpu.h"
#include "systick.h"
#include "sdram.h"
#define SDRAM_TIMEOUT ((uint32_t)0xFFFF)
#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)
#if defined(MICROPY_HW_FMC_SDCKE0) && defined(MICROPY_HW_FMC_SDNE0)
#define FMC_SDRAM_BANK FMC_SDRAM_BANK1
#define FMC_SDRAM_CMD_TARGET_BANK FMC_SDRAM_CMD_TARGET_BANK1
#define SDRAM_START_ADDRESS 0xC0000000
#elif defined(MICROPY_HW_FMC_SDCKE1) && defined(MICROPY_HW_FMC_SDNE1)
#define FMC_SDRAM_BANK FMC_SDRAM_BANK2
#define FMC_SDRAM_CMD_TARGET_BANK FMC_SDRAM_CMD_TARGET_BANK2
#define SDRAM_START_ADDRESS 0xD0000000
#endif
// Provides the MPU_REGION_SIZE_X value when passed the size of region in bytes
// "m" must be a power of 2 between 32 and 4G (2**5 and 2**32) and this formula
// computes the log2 of "m", minus 1
#define MPU_REGION_SIZE(m) (((m) - 1) / (((m) - 1) % 255 + 1) / 255 % 255 * 8 + 7 - 86 / (((m) - 1) % 255 + 12) - 1)
#define SDRAM_MPU_REGION_SIZE (MPU_REGION_SIZE(MICROPY_HW_SDRAM_SIZE))
#ifdef FMC_SDRAM_BANK
static void sdram_init_seq(SDRAM_HandleTypeDef *hsdram, FMC_SDRAM_CommandTypeDef *command);
bool sdram_init(void) {
SDRAM_HandleTypeDef hsdram;
FMC_SDRAM_TimingTypeDef SDRAM_Timing;
FMC_SDRAM_CommandTypeDef command;
__HAL_RCC_FMC_CLK_ENABLE();
#if defined(MICROPY_HW_FMC_SDCKE0)
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_SDCKE0, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_SDCKE0);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_SDNE0, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_SDNE0);
#elif defined(MICROPY_HW_FMC_SDCKE1)
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_SDCKE1, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_SDCKE1);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_SDNE1, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_SDNE1);
#endif
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_SDCLK, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_SDCLK);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_SDNCAS, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_SDNCAS);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_SDNRAS, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_SDNRAS);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_SDNWE, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_SDNWE);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_BA0, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_BA0);
#ifdef MICROPY_HW_FMC_BA1
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_BA1, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_BA1);
#endif
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_NBL0, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_NBL0);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_NBL1, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_NBL1);
#ifdef MICROPY_HW_FMC_NBL2
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_NBL2, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_NBL2);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_NBL3, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_NBL3);
#endif
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_A0, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_A0);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_A1, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_A1);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_A2, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_A2);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_A3, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_A3);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_A4, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_A4);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_A5, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_A5);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_A6, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_A6);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_A7, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_A7);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_A8, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_A8);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_A9, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_A9);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_A10, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_A10);
#ifdef MICROPY_HW_FMC_A11
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_A11, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_A11);
#endif
#ifdef MICROPY_HW_FMC_A12
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_A12, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_A12);
#endif
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_D0, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_D0);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_D1, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_D1);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_D2, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_D2);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_D3, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_D3);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_D4, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_D4);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_D5, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_D5);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_D6, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_D6);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_D7, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_D7);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_D8, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_D8);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_D9, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_D9);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_D10, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_D10);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_D11, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_D11);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_D12, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_D12);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_D13, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_D13);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_D14, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_D14);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_D15, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_D15);
#ifdef MICROPY_HW_FMC_D16
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_D16, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_D16);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_D17, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_D17);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_D18, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_D18);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_D19, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_D19);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_D20, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_D20);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_D21, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_D21);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_D22, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_D22);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_D23, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_D23);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_D24, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_D24);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_D25, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_D25);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_D26, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_D26);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_D27, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_D27);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_D28, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_D28);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_D29, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_D29);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_D30, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_D30);
mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_D31, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_D31);
#endif
/* 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 = MICROPY_HW_SDRAM_TIMING_TMRD;
/* TXSR: min=70ns (6x11.90ns) */
SDRAM_Timing.ExitSelfRefreshDelay = MICROPY_HW_SDRAM_TIMING_TXSR;
/* TRAS */
SDRAM_Timing.SelfRefreshTime = MICROPY_HW_SDRAM_TIMING_TRAS;
/* TRC */
SDRAM_Timing.RowCycleDelay = MICROPY_HW_SDRAM_TIMING_TRC;
/* TWR */
SDRAM_Timing.WriteRecoveryTime = MICROPY_HW_SDRAM_TIMING_TWR;
/* TRP */
SDRAM_Timing.RPDelay = MICROPY_HW_SDRAM_TIMING_TRP;
/* TRCD */
SDRAM_Timing.RCDDelay = MICROPY_HW_SDRAM_TIMING_TRCD;
#define _FMC_INIT(x, n) x##_##n
#define FMC_INIT(x, n) _FMC_INIT(x, n)
hsdram.Init.SDBank = FMC_SDRAM_BANK;
hsdram.Init.ColumnBitsNumber = FMC_INIT(FMC_SDRAM_COLUMN_BITS_NUM, MICROPY_HW_SDRAM_COLUMN_BITS_NUM);
hsdram.Init.RowBitsNumber = FMC_INIT(FMC_SDRAM_ROW_BITS_NUM, MICROPY_HW_SDRAM_ROW_BITS_NUM);
hsdram.Init.MemoryDataWidth = FMC_INIT(FMC_SDRAM_MEM_BUS_WIDTH, MICROPY_HW_SDRAM_MEM_BUS_WIDTH);
hsdram.Init.InternalBankNumber = FMC_INIT(FMC_SDRAM_INTERN_BANKS_NUM, MICROPY_HW_SDRAM_INTERN_BANKS_NUM);
hsdram.Init.CASLatency = FMC_INIT(FMC_SDRAM_CAS_LATENCY, MICROPY_HW_SDRAM_CAS_LATENCY);
hsdram.Init.SDClockPeriod = FMC_INIT(FMC_SDRAM_CLOCK_PERIOD, MICROPY_HW_SDRAM_CLOCK_PERIOD);
hsdram.Init.ReadPipeDelay = FMC_INIT(FMC_SDRAM_RPIPE_DELAY, MICROPY_HW_SDRAM_RPIPE_DELAY);
hsdram.Init.ReadBurst = (MICROPY_HW_SDRAM_RBURST) ? FMC_SDRAM_RBURST_ENABLE : FMC_SDRAM_RBURST_DISABLE;
hsdram.Init.WriteProtection = (MICROPY_HW_SDRAM_WRITE_PROTECTION) ? FMC_SDRAM_WRITE_PROTECTION_ENABLE : FMC_SDRAM_WRITE_PROTECTION_DISABLE;
/* Initialize the SDRAM controller */
if (HAL_SDRAM_Init(&hsdram, &SDRAM_Timing) != HAL_OK) {
return false;
}
sdram_init_seq(&hsdram, &command);
return true;
}
void *sdram_start(void) {
return (void *)SDRAM_START_ADDRESS;
}
void *sdram_end(void) {
return (void *)(SDRAM_START_ADDRESS + MICROPY_HW_SDRAM_SIZE);
}
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_BANK;
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_BANK;
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_BANK;
command->AutoRefreshNumber = MICROPY_HW_SDRAM_AUTOREFRESH_NUM;
command->ModeRegisterDefinition = 0;
/* Send the command */
HAL_SDRAM_SendCommand(hsdram, command, 0x1000);
/* Step 7: Program the external memory mode register */
tmpmrd = (uint32_t)FMC_INIT(SDRAM_MODEREG_BURST_LENGTH, MICROPY_HW_SDRAM_BURST_LENGTH) |
SDRAM_MODEREG_BURST_TYPE_SEQUENTIAL |
FMC_INIT(SDRAM_MODEREG_CAS_LATENCY, MICROPY_HW_SDRAM_CAS_LATENCY) |
SDRAM_MODEREG_OPERATING_MODE_STANDARD |
SDRAM_MODEREG_WRITEBURST_MODE_SINGLE;
command->CommandMode = FMC_SDRAM_CMD_LOAD_MODE;
command->CommandTarget = FMC_SDRAM_CMD_TARGET_BANK;
command->AutoRefreshNumber = 1;
command->ModeRegisterDefinition = tmpmrd;
/* Send the command */
HAL_SDRAM_SendCommand(hsdram, command, 0x1000);
/* Step 8: Set the refresh rate counter
RefreshRate = 64 ms / 8192 cyc = 7.8125 us/cyc
RefreshCycles = 7.8125 us * 90 MHz = 703
According to the formula on p.1665 of the reference manual,
we also need to subtract 20 from the value, so the target
refresh rate is 703 - 20 = 683.
*/
#define REFRESH_COUNT (MICROPY_HW_SDRAM_REFRESH_RATE * 90000 / 8192 - 20)
HAL_SDRAM_ProgramRefreshRate(hsdram, REFRESH_COUNT);
#if defined(STM32F7) || defined(STM32H7)
/* Enable MPU for the SDRAM Memory Region to allow non-aligned
accesses (hard-fault otherwise)
Initially disable all access for the entire SDRAM memory space,
then enable access/caching for the size used
*/
uint32_t irq_state = mpu_config_start();
mpu_config_region(MPU_REGION_SDRAM1, SDRAM_START_ADDRESS, MPU_CONFIG_DISABLE(0x00, MPU_REGION_SIZE_512MB));
mpu_config_region(MPU_REGION_SDRAM2, SDRAM_START_ADDRESS, MPU_CONFIG_SDRAM(SDRAM_MPU_REGION_SIZE));
mpu_config_end(irq_state);
#endif
}
void sdram_enter_low_power(void) {
// Enter self-refresh mode.
// In self-refresh mode the SDRAM retains data without external clocking.
FMC_SDRAM_DEVICE->SDCMR |= (FMC_SDRAM_CMD_SELFREFRESH_MODE | // Command Mode
FMC_SDRAM_CMD_TARGET_BANK | // Command Target
(0 << 5U) | // Auto Refresh Number -1
(0 << 9U)); // Mode Register Definition
}
void sdram_leave_low_power(void) {
// Exit self-refresh mode.
// Self-refresh mode is exited when the device is accessed or the mode bits are
// set to Normal mode, so technically it's not necessary to call this functions.
FMC_SDRAM_DEVICE->SDCMR |= (FMC_SDRAM_CMD_NORMAL_MODE | // Command Mode
FMC_SDRAM_CMD_TARGET_BANK | // Command Target
(0 << 5U) | // Auto Refresh Number - 1
(0 << 9U)); // Mode Register Definition
}
void sdram_enter_power_down(void) {
// Enter power-down mode.
FMC_SDRAM_DEVICE->SDCMR |= (FMC_SDRAM_CMD_POWERDOWN_MODE | // Command Mode
FMC_SDRAM_CMD_TARGET_BANK | // Command Target
(0 << 5U) | // Auto Refresh Number -1
(0 << 9U)); // Mode Register Definition
}
#if __GNUC__ >= 11
// Prevent array bounds warnings when accessing SDRAM_START_ADDRESS as a memory pointer.
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Warray-bounds"
#pragma GCC diagnostic ignored "-Wstringop-overflow"
#endif
bool __attribute__((optimize("Os"))) sdram_test(bool exhaustive) {
uint8_t const pattern = 0xaa;
uint8_t const antipattern = 0x55;
volatile uint8_t *const mem_base = (uint8_t *)sdram_start();
#if MICROPY_HW_SDRAM_TEST_FAIL_ON_ERROR
char error_buffer[1024];
#endif
#if (__DCACHE_PRESENT == 1)
bool i_cache_disabled = false;
bool d_cache_disabled = false;
// Disable caches for testing.
if (SCB->CCR & (uint32_t)SCB_CCR_IC_Msk) {
SCB_DisableICache();
i_cache_disabled = true;
}
if (SCB->CCR & (uint32_t)SCB_CCR_DC_Msk) {
SCB_DisableDCache();
d_cache_disabled = true;
}
#endif
// Test data bus
for (uint32_t i = 0; i < MICROPY_HW_SDRAM_MEM_BUS_WIDTH; i++) {
*((volatile uint32_t *)mem_base) = (1 << i);
__DSB();
if (*((volatile uint32_t *)mem_base) != (1 << i)) {
#if MICROPY_HW_SDRAM_TEST_FAIL_ON_ERROR
snprintf(error_buffer, sizeof(error_buffer),
"Data bus test failed at 0x%p expected 0x%x found 0x%lx",
&mem_base[0], (1 << i), ((volatile uint32_t *)mem_base)[0]);
MICROPY_BOARD_FATAL_ERROR(error_buffer);
#endif
return false;
}
}
// Test address bus
for (uint32_t i = 1; i < MICROPY_HW_SDRAM_SIZE; i <<= 1) {
mem_base[i] = pattern;
__DSB();
if (mem_base[i] != pattern) {
#if MICROPY_HW_SDRAM_TEST_FAIL_ON_ERROR
snprintf(error_buffer, sizeof(error_buffer),
"Address bus test failed at 0x%p expected 0x%x found 0x%x",
&mem_base[i], pattern, mem_base[i]);
MICROPY_BOARD_FATAL_ERROR(error_buffer);
#endif
return false;
}
}
// Check for aliasing (overlapping addresses)
mem_base[0] = antipattern;
__DSB();
for (uint32_t i = 1; i < MICROPY_HW_SDRAM_SIZE; i <<= 1) {
if (mem_base[i] != pattern) {
#if MICROPY_HW_SDRAM_TEST_FAIL_ON_ERROR
snprintf(error_buffer, sizeof(error_buffer),
"Address bus overlap at 0x%p expected 0x%x found 0x%x",
&mem_base[i], pattern, mem_base[i]);
MICROPY_BOARD_FATAL_ERROR(error_buffer);
#endif
return false;
}
}
// Test all RAM cells
if (exhaustive) {
// Write all memory first then compare, so even if the cache
// is enabled, it's not just writing and reading from cache.
// Note: This test should also detect refresh rate issues.
for (uint32_t i = 0; i < MICROPY_HW_SDRAM_SIZE; i++) {
mem_base[i] = ((i % 2) ? pattern : antipattern);
}
for (uint32_t i = 0; i < MICROPY_HW_SDRAM_SIZE; i++) {
if (mem_base[i] != ((i % 2) ? pattern : antipattern)) {
#if MICROPY_HW_SDRAM_TEST_FAIL_ON_ERROR
snprintf(error_buffer, sizeof(error_buffer),
"Address bus slow test failed at 0x%p expected 0x%x found 0x%x",
&mem_base[i], ((i % 2) ? pattern : antipattern), mem_base[i]);
MICROPY_BOARD_FATAL_ERROR(error_buffer);
#endif
return false;
}
}
}
#if (__DCACHE_PRESENT == 1)
// Re-enable caches if they were enabled before the test started.
if (i_cache_disabled) {
SCB_EnableICache();
}
if (d_cache_disabled) {
SCB_EnableDCache();
}
#endif
return true;
}
#if __GNUC__ >= 11
#pragma GCC diagnostic pop
#endif
#endif // FMC_SDRAM_BANK
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