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device_config.c
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device_config.c
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/*
* MIT License
*
* Copyright (c) 2020 Kirill Kotyagin
*/
#include <string.h>
#include <stm32f1xx.h>
#include <limits.h>
#include "device_config.h"
#define DEVICE_CONFIG_FLASH_SIZE 0x10000UL
#define DEVICE_CONFIG_NUM_PAGES 2
#define DEVICE_CONFIG_PAGE_SIZE 0x400UL
#define DEVICE_CONFIG_FLASH_END (FLASH_BASE + DEVICE_CONFIG_FLASH_SIZE)
#define DEVICE_CONFIG_BASE_ADDR ((void*)(DEVICE_CONFIG_FLASH_END - DEVICE_CONFIG_NUM_PAGES * DEVICE_CONFIG_PAGE_SIZE))
#define DEVICE_CONFIG_MAGIC 0xDECFDECFUL
static const device_config_t default_device_config = {
.status_led_pin = { .port = GPIOC, .pin = 13, .dir = gpio_dir_output, .speed = gpio_speed_low, .func = gpio_func_general, .output = gpio_output_od, .polarity = gpio_polarity_low },
.config_pin = { .port = GPIOB, .pin = 5, .dir = gpio_dir_input, .pull = gpio_pull_up, .polarity = gpio_polarity_low },
.cdc_config = {
.port_config = {
/* Port 0 */
{
.pins =
{
/* rx */ { .port = GPIOA, .pin = 10, .dir = gpio_dir_input, .pull = gpio_pull_up, .polarity = gpio_polarity_high },
/* tx */ { .port = GPIOA, .pin = 9, .dir = gpio_dir_output, .speed = gpio_speed_medium, .func = gpio_func_alternate, .output = gpio_output_pp, .polarity = gpio_polarity_high },
/* rts */ { .port = GPIOA, .pin = 15, .dir = gpio_dir_output, .speed = gpio_speed_medium, .func = gpio_func_general, .output = gpio_output_pp, .polarity = gpio_polarity_low},
/* cts */ { .port = 0 }, /* CTS pin is occupied by USB */
/* dsr */ { .port = GPIOB, .pin = 7, .dir = gpio_dir_input, .pull = gpio_pull_up, .polarity = gpio_polarity_low },
/* dtr */ { .port = GPIOA, .pin = 4, .dir = gpio_dir_output, .speed = gpio_speed_medium, .func = gpio_func_general, .output = gpio_output_pp, .polarity = gpio_polarity_low },
/* dcd */ { .port = GPIOB, .pin = 15, .dir = gpio_dir_input, .pull = gpio_pull_up, .polarity = gpio_polarity_low },
/* ri */ { .port = GPIOB, .pin = 3, .dir = gpio_dir_input, .pull = gpio_pull_up, .polarity = gpio_polarity_low },
/* txa */ { .port = GPIOB, .pin = 0, .dir = gpio_dir_output, .speed = gpio_speed_medium, .func = gpio_func_general, .output = gpio_output_pp, .polarity = gpio_polarity_high },
}
},
/* Port 1 */
{
.pins =
{
/* rx */ { .port = GPIOA, .pin = 3, .dir = gpio_dir_input, .pull = gpio_pull_up, .polarity = gpio_polarity_high },
/* tx */ { .port = GPIOA, .pin = 2, .dir = gpio_dir_output, .speed = gpio_speed_medium, .func = gpio_func_alternate, .output = gpio_output_pp, .polarity = gpio_polarity_high },
/* rts */ { .port = GPIOA, .pin = 1, .dir = gpio_dir_output, .speed = gpio_speed_medium, .func = gpio_func_general, .output = gpio_output_pp, .polarity = gpio_polarity_low},
/* cts */ { .port = GPIOA, .pin = 0, .dir = gpio_dir_input, .pull = gpio_pull_down, .polarity = gpio_polarity_low },
/* dsr */ { .port = GPIOB, .pin = 4, .dir = gpio_dir_input, .pull = gpio_pull_up, .polarity = gpio_polarity_low },
/* dtr */ { .port = GPIOA, .pin = 5, .dir = gpio_dir_output, .speed = gpio_speed_medium, .func = gpio_func_general, .output = gpio_output_pp, .polarity = gpio_polarity_low },
/* dcd */ { .port = GPIOB, .pin = 8, .dir = gpio_dir_input, .pull = gpio_pull_up, .polarity = gpio_polarity_low },
/* ri */ { .port = GPIOB, .pin = 12, .dir = gpio_dir_input, .pull = gpio_pull_up, .polarity = gpio_polarity_low },
/* txa */ { .port = GPIOB, .pin = 1, .dir = gpio_dir_output, .speed = gpio_speed_medium, .func = gpio_func_general, .output = gpio_output_pp, .polarity = gpio_polarity_high },
}
},
/* Port 2 */
{
.pins =
{
/* rx */ { .port = GPIOB, .pin = 11, .dir = gpio_dir_input, .pull = gpio_pull_up, .polarity = gpio_polarity_high },
/* tx */ { .port = GPIOB, .pin = 10, .dir = gpio_dir_output, .speed = gpio_speed_medium, .func = gpio_func_alternate, .output = gpio_output_pp, .polarity = gpio_polarity_high },
/* rts */ { .port = GPIOB, .pin = 14, .dir = gpio_dir_output, .speed = gpio_speed_medium, .func = gpio_func_general, .output = gpio_output_pp, .polarity = gpio_polarity_low },
/* cts */ { .port = GPIOB, .pin = 13, .dir = gpio_dir_input, .pull = gpio_pull_down, .polarity = gpio_polarity_low },
/* dsr */ { .port = GPIOB, .pin = 6, .dir = gpio_dir_input, .pull = gpio_pull_up, .polarity = gpio_polarity_low },
/* dtr */ { .port = GPIOA, .pin = 6, .dir = gpio_dir_output, .speed = gpio_speed_medium, .func = gpio_func_general, .output = gpio_output_pp, .polarity = gpio_polarity_low },
/* dcd */ { .port = GPIOB, .pin = 9, .dir = gpio_dir_input, .pull = gpio_pull_up, .polarity = gpio_polarity_low },
/* ri */ { .port = GPIOA, .pin = 8, .dir = gpio_dir_input, .pull = gpio_pull_up, .polarity = gpio_polarity_low },
/* txa */ { .port = GPIOA, .pin = 7, .dir = gpio_dir_output, .speed = gpio_speed_medium, .func = gpio_func_general, .output = gpio_output_pp, .polarity = gpio_polarity_high },
}
},
}
}
};
static device_config_t current_device_config;
static uint32_t device_config_calc_crc(const device_config_t *device_config) {
uint32_t *word_p = (uint32_t*)device_config;
size_t bytes_left = offsetof(device_config_t, crc);
CRC->CR |= CRC_CR_RESET;
while (bytes_left > sizeof(*word_p)) {
CRC->DR = *word_p++;
bytes_left -= sizeof(*word_p);
}
if (bytes_left) {
uint32_t shift = 0;
uint32_t tail = 0;
uint8_t *byte_p = (uint8_t*)word_p;
for (int i = 0; i < bytes_left; i++) {
tail |= (uint32_t)(*byte_p++) << (shift);
shift += CHAR_BIT;
}
CRC->DR = tail;
}
return CRC->DR;
}
const static device_config_t* device_config_get_stored() {
uint8_t *config_page = (uint8_t*)DEVICE_CONFIG_BASE_ADDR;
size_t config_pages = DEVICE_CONFIG_NUM_PAGES;
while (config_pages--) {
const device_config_t *stored_config = (device_config_t*)config_page;
if ((stored_config->magic == DEVICE_CONFIG_MAGIC) &&
(device_config_calc_crc(stored_config) == stored_config->crc)) {
return stored_config;
}
config_page += DEVICE_CONFIG_PAGE_SIZE;
}
return 0;
}
void device_config_init() {
RCC->AHBENR |= RCC_AHBENR_CRCEN;
const device_config_t *stored_config = device_config_get_stored();
if (stored_config == 0) {
stored_config = &default_device_config;
}
memcpy(¤t_device_config, stored_config, sizeof(*stored_config));
}
device_config_t *device_config_get() {
return ¤t_device_config;
}
void device_config_save() {
uint16_t *last_config_magic = 0;
uint8_t *config_page = (uint8_t*)DEVICE_CONFIG_BASE_ADDR;
size_t config_pages = DEVICE_CONFIG_NUM_PAGES;
uint16_t *src_word_p = (uint16_t*)¤t_device_config;
uint16_t *dst_word_p;
size_t bytes_left = sizeof(current_device_config);
while (config_pages-- && (last_config_magic == 0)) {
const device_config_t *stored_config = (device_config_t*)config_page;
if ((stored_config->magic == DEVICE_CONFIG_MAGIC) &&
(device_config_calc_crc(stored_config) == stored_config->crc)) {
last_config_magic = (uint16_t*)&stored_config->magic;
}
config_page += DEVICE_CONFIG_PAGE_SIZE;
}
if (config_page == ((uint8_t*)DEVICE_CONFIG_BASE_ADDR + (DEVICE_CONFIG_NUM_PAGES * DEVICE_CONFIG_PAGE_SIZE))) {
config_page = (uint8_t*)DEVICE_CONFIG_BASE_ADDR;
}
dst_word_p = (uint16_t*)config_page;
if (FLASH->CR & FLASH_CR_LOCK) {
FLASH->KEYR = 0x45670123;
FLASH->KEYR = 0xCDEF89AB;
}
while (FLASH->SR & FLASH_SR_BSY);
FLASH->SR = FLASH->SR & FLASH_SR_EOP;
FLASH->CR = FLASH_CR_PER;
FLASH->AR = (uint32_t)config_page;
FLASH->CR |= FLASH_CR_STRT;
while (!(FLASH->SR & FLASH_SR_EOP));
FLASH->SR = FLASH_SR_EOP;
FLASH->CR &= ~FLASH_CR_PER;
current_device_config.magic = DEVICE_CONFIG_MAGIC;
current_device_config.crc = device_config_calc_crc(¤t_device_config);
FLASH->CR |= FLASH_CR_PG;
while (bytes_left > 1) {
*dst_word_p++ = *src_word_p++;
while (!(FLASH->SR & FLASH_SR_EOP));
FLASH->SR = FLASH_SR_EOP;
bytes_left -= sizeof(*dst_word_p);
}
if (bytes_left) {
*dst_word_p = (uint16_t)(*(uint8_t*)src_word_p);
while (!(FLASH->SR & FLASH_SR_EOP));
FLASH->SR = FLASH_SR_EOP;
}
if (last_config_magic) {
*last_config_magic = 0x0000;
while (!(FLASH->SR & FLASH_SR_EOP));
FLASH->SR = FLASH_SR_EOP;
}
FLASH->CR &= ~(FLASH_CR_PG);
FLASH->CR |= FLASH_CR_LOCK;
}
void device_config_reset() {
memcpy(¤t_device_config, &default_device_config, sizeof(default_device_config));
device_config_save();
}