AVR_ATMEGA_USART/avr_usart.h

/*
 * Author: Jake Goodwin
 * Date: 2023
 * Description: AT-09 Bluetooth module library for AVR micro crontrollers.
 * Filename: avr_at-09.h
 */
#define __AVR_ATmega328P__
#include <inttypes.h>
#include <stdint.h>

//#############################
//PIN DEFINES AND CONSTS
//#############################

/*
 * AVR D0 --> AT-09 TX
 * AVR D1 --> AT-09 RX
 * AVR D2 --> AT-09 State
 */
#define FOSC        1000000UL
#define BLE_BAUD    4800 
#define BT_UBRR     ((FOSC)/(BLE_BAUD*16UL)-1)

#define TX_PIN      PIND1
#define TX_DDR      DDD1

#define RX_PIN      PIND0
#define RX_DDR      DDD0

#define AT_PORT     PORTD

//LED PIN for indicator and debug.
#define LED_PIN     PINC0
#define LED_DDR     DDC0


//#############################
//MACROS
//#############################

#define USE_U2X 0


//#############################
//FUNCTION PROTOTYPES
//#############################
static void led_blink(void);

void init_usart0(void);
void tx_usart0(unsigned char data);
unsigned char rx_usart0(void);

void serial0_write(unsigned char* buffer, uint8_t write_length);
void serial0_read(unsigned char* buffer, uint8_t buf_length);
void serial0_read_with_err_checking(unsigned char* buffer, uint8_t buf_length);
void serial0_set_baud(uint8_t baud);
void seiral0_enable_timeouts(uint8_t ms);
void serial0_flush_rxbuf(void);