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demo: SPI Flash interface working

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This commit is contained in:
jaseg 2020-02-26 13:40:37 +01:00
parent 2964bda23c
commit fcbdab4ab2
4 changed files with 95 additions and 60 deletions
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2
controller/fw/Makefile
View file

@ -24,7 +24,7 @@ GDB := $(PREFIX)gdb
CFLAGS += -I$(OPENCM3_DIR)/include -Imspdebug/util -Imspdebug/drivers
CFLAGS += -Os -std=c11 -g -DSTM32F4
CFLAGS += -Os -std=gnu11 -g -DSTM32F4
# Note: libopencm3 requires some standard libc definitions from stdint.h and stdbool.h, so we don't pass -nostdinc here.
CFLAGS += -nostdlib -ffreestanding
CFLAGS += -mthumb -mcpu=cortex-m4 -mfloat-abi=hard -mfpu=fpv4-sp-d16 -g

24
controller/fw/main.c
View file

@ -2,8 +2,11 @@
#include <stdbool.h>
#include <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/spi.h>
#include <libopencm3/stm32/gpio.h>
#include "spi_flash.h"
static struct spi_flash_if spif;
static void clock_setup(void)
@ -33,9 +36,28 @@ static void spi_flash_setup(void)
gpio_set_output_options(GPIOB, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO0 | GPIO3 | GPIO4 | GPIO5);
gpio_set_af(GPIOB, 5, GPIO3 | GPIO4 | GPIO5);
spi_init(&spif, SPI1, &spi_flash_if_set_cs);
spif_init(&spif, 256, SPI1, &spi_flash_if_set_cs);
}
/*
void spi_flash_test(void) {
spif_clear_mem(&spif);
uint32_t buf[1024];
for (size_t addr=0; addr<0x10000; addr += sizeof(buf)) {
for (size_t i=0; i<sizeof(buf); i+= sizeof(buf[0]))
buf[i/sizeof(buf[0])] = addr + i;
spif_write(&spif, addr, sizeof(buf), (char *)buf);
}
for (size_t i=0; i<sizeof(buf)/sizeof(buf[0]); i++)
buf[i] = 0;
spif_read(&spif, 0x1030, sizeof(buf), (char *)buf);
asm volatile ("bkpt");
}
*/
int main(void)
{
clock_setup();

117
controller/fw/spi_flash.c
View file

@ -1,5 +1,6 @@
/* Library for SPI flash 25* devices.
* Copyright (c) 2014 Multi-Tech Systems
* Copyright (c) 2020 Jan Goette <ma@jaseg.de>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
@ -20,6 +21,8 @@
* SOFTWARE.
*/
#include "spi_flash.h"
#include <libopencm3/stm32/spi.h>
enum {
WRITE_ENABLE = 0x06,
@ -46,113 +49,115 @@ enum {
};
static void enable_write(struct spi_flash_if *spif);
static void wait_for_write(struct spi_flash_if *spif);
static void spif_write_page(struct spi_flash_if *spif, size_t addr, size_t len, const char* data);
static uint8_t spif_read_status(struct spi_flash_if *spif);
static void spif_enable_write(struct spi_flash_if *spif);
static void spif_wait_for_write(struct spi_flash_if *spif);
#define low_byte(x) (x&0xff)
#define mid_byte(x) ((x>>8)&0xff)
#define high_byte(x) ((x>>16)&0xff)
void spif_init(struct spi_flash_if *spif, uint32_t spi_base, void (*cs)(bool val)) {
void spif_init(struct spi_flash_if *spif, size_t page_size, uint32_t spi_base, void (*cs)(bool val)) {
spif->spi_base = spi_base;
spif->page_size = page_size;
spif->cs = cs;
spif->cs(1);
spi_reset(spif->spi_base);
spi_init_master(spif->spi_base,
SPI_CR1_BAUDRATE_FPCLK_DIV_1,
SPI_CR1_BAUDRATE_FPCLK_DIV_2,
SPI_CR1_CPOL_CLK_TO_1_WHEN_IDLE,
CPI_CR1_CPHA_CLK_TRANSITION_2,
SPI_CR1_CPHA_CLK_TRANSITION_2,
SPI_CR1_DFF_8BIT,
CPI_CR1_MSBFIRST);
SPI_CR1_MSBFIRST);
spi_enable_software_slave_management(spif->spi_base);
spi_set_nss_high(spif->spi_base);
spi_enable(spif->spi_base);
spif->cs(0)
spif->cs(0);
spi_send(spif->spi_base, READ_IDENTIFICATION);
spif->id.mfg_id = spi_read(SPI1);
spif->id.type = spi_read(SPI1);
spif->id.size = 1<<spi_read(SPI1);
spif->cs(1)
spif->id.mfg_id = spi_xfer(spif->spi_base, 0);
spif->id.type = spi_xfer(spif->spi_base, 0);
spif->id.size = 1<<spi_xfer(spif->spi_base, 0);
spif->cs(1);
}
void spif_read(struct spi_flash_if *spif, int addr, int len, char* data) {
void spif_read(struct spi_flash_if *spif, size_t addr, size_t len, char* data) {
spif_enable_write(spif);
spif->cs(0)
spi_write(spif->spi_base, READ_DATA);
spi_write(spif->spi_base, high_byte(addr));
spi_write(spif->spi_base, mid_byte(addr));
spi_write(spif->spi_base, low_byte(addr));
spif->cs(0);
spi_xfer(spif->spi_base, READ_DATA);
spi_xfer(spif->spi_base, high_byte(addr));
spi_xfer(spif->spi_base, mid_byte(addr));
spi_xfer(spif->spi_base, low_byte(addr));
for (size_t i = 0; i < len; i++)
data[i] = spi_read(spif->spi_base);
data[i] = spi_xfer(spif->spi_base, 0);
spif->cs(1);
}
void spif_write(spi_flash_if *spif, size_t addr, size_t len, const char* data) {
size_t written = 0;
size_t write_size = 0;
void spif_write(struct spi_flash_if *spif, size_t addr, size_t len, const char* data) {
size_t written = 0, write_size = 0;
while (written < len) {
write_size = _page_size - ((addr + written) % _page_size);
if (written + write_size > len) {
write_size = spif->page_size - ((addr + written) % spif->page_size);
if (written + write_size > len)
write_size = len - written;
}
write_page(addr + written, write_size, data + written);
spif_write_page(spif, addr + written, write_size, data + written);
written += write_size;
}
}
uint8_t spif_read_status(spi_flash_if *spif) {
static uint8_t spif_read_status(struct spi_flash_if *spif) {
spif->cs(0);
spi_write(spif->spi_base, READ_STATUS);
uint8_t status = spi_read(spif->spi_base);
spi_xfer(spif->spi_base, READ_STATUS);
uint8_t status = spi_xfer(spif->spi_base, 0);
spif->cs(1);
return status;
}
void spif_clear_sector(spi_flash_if *spif, size_t addr) {
void spif_clear_sector(struct spi_flash_if *spif, size_t addr) {
spif_enable_write(spif);
spif->cs(0);
spi_write(spif->spi_abse, SECTOR_ERASE);
spi_write(spif->spi_abse, high_byte(addr));
spi_write(spif->spi_abse, mid_byte(addr));
spi_write(spif->spi_abse, low_byte(addr));
spif->cs(1);
wait_for_write(spif);
}
void spif_clear_mem(spi_flash_if *spif) {
spif_enable_write(spif);
spif->cs(0);
spi_write(spif->spi_base, BULK_ERASE);
spi_xfer(spif->spi_base, SECTOR_ERASE);
spi_xfer(spif->spi_base, high_byte(addr));
spi_xfer(spif->spi_base, mid_byte(addr));
spi_xfer(spif->spi_base, low_byte(addr));
spif->cs(1);
spif_wait_for_write(spif);
}
void spif_write_page(struct spi_flash_if *spif, size_t addr, size_t len, const char* data) {
spif_enable_write();
void spif_clear_mem(struct spi_flash_if *spif) {
spif_enable_write(spif);
spif->cs(0);
spi_write(spif->base, PAGE_PROGRAM);
spi_write(spif->base, high_byte(addr));
spi_write(spif->base, mid_byte(addr));
spi_write(spif->base, low_byte(addr));
spi_xfer(spif->spi_base, BULK_ERASE);
spif->cs(1);
for (int i = 0; i < len; i++) {
spi_write(spif->spi_base, data[i]);
spif_wait_for_write(spif);
}
static void spif_write_page(struct spi_flash_if *spif, size_t addr, size_t len, const char* data) {
spif_enable_write(spif);
spif->cs(0);
spi_xfer(spif->spi_base, PAGE_PROGRAM);
spi_xfer(spif->spi_base, high_byte(addr));
spi_xfer(spif->spi_base, mid_byte(addr));
spi_xfer(spif->spi_base, low_byte(addr));
for (size_t i = 0; i < len; i++) {
spi_xfer(spif->spi_base, data[i]);
}
spif->cs(1);
@ -161,7 +166,7 @@ void spif_write_page(struct spi_flash_if *spif, size_t addr, size_t len, const c
static void spif_enable_write(struct spi_flash_if *spif) {
spif->cs(0);
spi_write(spif->spi_base, WRITE_ENABLE);
spi_xfer(spif->spi_base, WRITE_ENABLE);
spif->cs(1);
}
@ -173,12 +178,12 @@ static void spif_wait_for_write(struct spi_flash_if *spif) {
void spif_deep_power_down(struct spi_flash_if *spif) {
spif->cs(0);
spi_write(spif->spi_base, DEEP_POWER_DOWN);
spif->cs(1)
spi_xfer(spif->spi_base, DEEP_POWER_DOWN);
spif->cs(1);
}
void spif_wakeup(struct spi_flash_if *spif) {
spif->cs(0);
spi_write(spif->spi_base, DEEP_POWER_DOWN_RELEASE);
spif->cs(1)
spi_xfer(spif->spi_base, DEEP_POWER_DOWN_RELEASE);
spif->cs(1);
}

12
controller/fw/spi_flash.h
View file

@ -2,7 +2,7 @@
#define __SPI_FLASH_H__
#include <stdbool.h>
#include <stdint.h>
#include <unistd.h>
struct spi_mem_id {
size_t size;
@ -13,10 +13,18 @@ struct spi_mem_id {
struct spi_flash_if {
struct spi_mem_id id;
uint32_t spi_base;
size_t page_size;
void (*cs)(bool val);
};
int spif_init(struct spi_mem_id *mem_data);
void spif_init(struct spi_flash_if *spif, size_t page_size, uint32_t spi_base, void (*cs)(bool val));
void spif_write(struct spi_flash_if *spif, size_t addr, size_t len, const char* data);
void spif_read(struct spi_flash_if *spif, size_t addr, size_t len, char* data);
void spif_clear_mem(struct spi_flash_if *spif);
void spif_clear_sector(struct spi_flash_if *spif, size_t addr);
void spif_deep_power_down(struct spi_flash_if *spif);
void spif_wakeup(struct spi_flash_if *spif);