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