128 lines
2.4 KiB
C

/*
* eeprom.c
*
* Created on: Jun 7, 2017
* Author: wn
*/
#include "eeprom.h"
#include "stm32f1xx_hal.h"
#include <string.h>
#define HIGH GPIO_PIN_SET
#define LOW GPIO_PIN_RESET
extern SPI_HandleTypeDef hspi1;
const uint8_t EEPROM_READ = 0x03;
const uint8_t EEPROM_WRITE = 0x02;
const uint8_t EEPROM_WRDI = 0x04;
const uint8_t EEPROM_WREN = 0x06;
const uint8_t EEPROM_RDSR = 0x05;
const uint8_t EEPROM_WRSR = 0x01;
const uint32_t STORAGE_MAGIC = 0xaffe000b;
tStorage storage;
extern tDisplay display;
static void __EEPROM_CS(GPIO_PinState v) {
HAL_GPIO_WritePin(EEPROM_CS_GPIO_Port, EEPROM_CS_Pin, v);
}
__attribute__((unused)) static uint8_t eepromReadStatus() {
struct {
uint8_t rdsr;
uint8_t data;
} txMsg = {
.rdsr = EEPROM_RDSR
}, rxMsg;
__EEPROM_CS(LOW);
HAL_SPI_TransmitReceive(&eepromSpi, &txMsg, &rxMsg, 2, HAL_MAX_DELAY);
__EEPROM_CS(HIGH);
return rxMsg.data;
}
static void eepromWren() {
struct {
uint8_t wren;
} txMsg = {
.wren = EEPROM_WREN
};
__EEPROM_CS(LOW);
HAL_SPI_Transmit(&eepromSpi, &txMsg, 1, HAL_MAX_DELAY);
__EEPROM_CS(HIGH);
}
__attribute__((unused)) static void eepromWrdi() {
struct {
uint8_t wrdi;
} txMsg = {
.wrdi = EEPROM_WRDI
};
__EEPROM_CS(LOW);
HAL_SPI_Transmit(&eepromSpi, &txMsg, 1, HAL_MAX_DELAY);
__EEPROM_CS(HIGH);
}
void eepromWrite(uint16_t addr, uint8_t *buf, uint8_t len) {
struct {
uint8_t write;
uint16_t addr;
uint8_t data[32];
} msg = {
.write = EEPROM_WRITE,
.addr = addr
};
memcpy(msg.data, buf, len);
eepromWren();
__EEPROM_CS(LOW);
HAL_SPI_Transmit(&eepromSpi, &msg, ((uint16_t)(len+3+1)), HAL_MAX_DELAY);
__EEPROM_CS(HIGH);
}
void eepromRead(uint16_t addr, uint8_t *buf, uint8_t len) {
struct {
uint8_t read;
uint16_t addr;
uint8_t data[32];
} txMsg = {
.read = EEPROM_READ,
.addr = addr
},
rxMsg;
__EEPROM_CS(LOW);
HAL_SPI_TransmitReceive(&eepromSpi, &txMsg, &rxMsg, ((uint16_t)(len+3+1)), HAL_MAX_DELAY);
__EEPROM_CS(HIGH);
memcpy(buf, rxMsg.data, len);
}
int eepromReadStorage() {
eepromRead(STORAGE_ADDRESS, (uint8_t*) &storage, sizeof(storage));
if (storage.magic == STORAGE_MAGIC) {
return 0;
} else {
return -1;
}
}
void eepromWriteStorage() {
storage.magic = STORAGE_MAGIC;
eepromWrite(STORAGE_ADDRESS, (uint8_t*) &storage, sizeof(storage));
}