#include <main.h>
#include <spi.h>
#include <eeprom.h>
// #include <stm32f1xx_hal.h>
#include <string.h>

#define HIGH GPIO_PIN_SET
#define LOW GPIO_PIN_RESET



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;





typedef union {
  struct {
    uint8_t cmd;
    uint16_t addr;
    uint8_t data[32];
  } s;
  uint8_t b[35];
} t_spiMsg;


inline static void __EEPROM_CS(GPIO_PinState v) {
  HAL_GPIO_WritePin(EEPROM_CS_GPIO_Port, EEPROM_CS_Pin, v);
}

void eepromWrite(uint16_t addr, uint8_t *buf, uint8_t len) {
  t_spiMsg msg = {
    .s.cmd = EEPROM_WRITE,
    .s.addr = addr
  };
  memcpy(msg.s.data, buf, len);

  uint8_t writeEnable = EEPROM_WREN;

  __EEPROM_CS(LOW);
  HAL_SPI_Transmit(&eepromSpi, &writeEnable, 1, HAL_MAX_DELAY);
  __EEPROM_CS(HIGH);

  __EEPROM_CS(LOW);
  HAL_SPI_Transmit(&eepromSpi, msg.b, ((uint16_t)(len+3+1)), HAL_MAX_DELAY);
  __EEPROM_CS(HIGH);
}

void eepromRead(uint16_t addr, uint8_t *buf, uint8_t len) {
  t_spiMsg txMsg = {
    .s.cmd = EEPROM_READ,
    .s.addr = addr
  };

  t_spiMsg rxMsg;
  
  __EEPROM_CS(LOW);
  HAL_SPI_TransmitReceive(&eepromSpi, txMsg.b, rxMsg.b, ((uint16_t)(len+3+1)), HAL_MAX_DELAY);
  __EEPROM_CS(HIGH);

  memcpy(buf, rxMsg.s.data, len);
}