/* * eeprom.c * * Created on: Jun 7, 2017 * Author: wn */ #include "eeprom.h" #include "stm32f1xx_hal.h" #include #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)); }