Implement EEPROM bytewise read/write

Core/Inc/EEPROM.h

@@ -0,0 +1,41 @@
+#ifndef INC_EEPROM_H_
+#define INC_EEPROM_H_
+
+#include "stm32f4xx_hal.h"
+#include "stm32f4xx_hal_def.h"
+
+#define EEPROM_BASE_ADDR 0b1010000
+// Device address must be shifted left before being passed to the HAL
+#define EEPROM_DEV_ADDR (EEPROM_BASE_ADDR << 1)
+#define EEPROM_TIMEOUT 200 /* ms */
+#define EEPROM_READ_TRIES 5
+
+#define EEPROM_ADDR_SLAVE_ID 0x000
+
+typedef enum { EEPROM_OFF, EEPROM_READY, EEPROM_ERROR } EEPROM_State;
+extern EEPROM_State eeprom_state;
+
+void eeprom_init(I2C_HandleTypeDef* handle);
+
+/**
+ * @brief Write a byte to the EEPROM.
+ *
+ * @param addr 9-bit address (1 bit page select + 8 bit address)
+ * @param data The byte to write
+ */
+HAL_StatusTypeDef eeprom_write(uint16_t addr, uint8_t data);
+/**
+ * @brief Read a byte from the next address in the EEPROM.
+ *
+ * @param data 1-byte buffer into which the read byte is written.
+ */
+HAL_StatusTypeDef eeprom_read_curr(uint8_t* data);
+/**
+ * @brief Read a byte from the EEPROM (random-access).
+ *
+ * @param addr 9-bit address (1 bit page select + 8 bit address)
+ * @param data 1-byte buffer into which the read byte is written.
+ */
+HAL_StatusTypeDef eeprom_read_random(uint16_t addr, uint8_t* data);
+
+#endif // INC_EEPROM_H_

Core/Inc/stm32f4xx_it.h

@@ -57,6 +57,7 @@ void PendSV_Handler(void);
 void SysTick_Handler(void);
 void CAN1_RX0_IRQHandler(void);
 void CAN1_RX1_IRQHandler(void);
+void I2C1_EV_IRQHandler(void);
 void USART1_IRQHandler(void);
 void USART3_IRQHandler(void);
 void CAN2_RX0_IRQHandler(void);