src/avr_usart.c

@@ -4,6 +4,10 @@
  * Description: Small library to handle Serial communication on AVR micros 
  */
 
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <avr/sleep.h>
+#include <util/delay.h>
 #include "avr_usart.h"
 
 
@@ -21,8 +25,8 @@ int demo() {
 
     //enable interrupts
     sei();
-    char data[8] = "AT+BAUD3";
+    unsigned char data[8] = "AT+BAUD3";
-    char data_cmd[2] = "AT";
+    unsigned char data_cmd[2] = "AT";
     uint8_t data_len = 8;
     uint8_t data_cmd_len = 2;
 
@@ -82,7 +86,7 @@ void init_usart0(void) {
  * Output: None
  * Description: Sends a char over usart0
  */
-void tx_usart0(char data) {
+void tx_usart0(unsigned char data) {
     //first wait for the transmit buffer to be empty
     while(!(UCSR0A & (1<<UDRE0))) {
        ;//Equiv of continue
@@ -99,7 +103,7 @@ void tx_usart0(char data) {
  * Output: a 8bit char
  * Description: Recvs a char over usart0
  */
-char rx_usart0(void) {
+unsigned char rx_usart0(void) {
     //first wait for the data to be received.
     while( !(UCSR0A & (1<<RXC0)) ) {
         ;//Equiv of continue
@@ -132,7 +136,7 @@ void serial0_enable_timeouts(uint8_t ms) {
  * Output: None
  * Description:
  */
-void serial0_write(char* buffer, uint8_t write_length) {
+void serial0_write(unsigned char* buffer, uint8_t write_length) {
     for(uint8_t i = 0; i < write_length; i++) {
         tx_usart0(buffer[i]);
     }
@@ -195,7 +199,7 @@ void serial0_set_stop_bits(uint8_t number) {
  * Output: None
  * Description: Reads the serial data into a buffer of x length.
  */
-void serial0_read(char* buffer, uint8_t buf_length) {
+void serial0_read(unsigned char* buffer, uint8_t buf_length) {
     //clear buffer out?
     //buffer = 0;
     for(uint8_t i = 0; i < buf_length; i++) {

src/avr_usart.h

@@ -7,9 +7,6 @@
 //#define __AVR_ATmega328P__
 #include <inttypes.h>
 #include <stdint.h>
-#include <avr/io.h>
-#include <util/delay.h>
-#include <avr/interrupt.h>
 
 //#############################
 //PIN DEFINES AND CONSTS
@@ -27,6 +24,10 @@
     #define F_CPU   14745600UL
 #endif
 
+#ifndef BUAD
+    #define BAUD    4800 
+#endif
+
 #define F_UBRR     ((F_CPU)/(BAUD*16UL)-1)
 
 #define TX_PIN      PIND1
@@ -47,10 +48,8 @@
 //#############################
 
 #define USE_U2X 0
-//#define CARRIAGE_RETURN 1
+#define CARRIAGE_RETURN 1
-//#define LINE_FEED 1
+#define LINE_FEED 1
-
-#define DEBUG  1
 
 #if DEBUG == 1
 #define debug(data, data_len) serial0_write(data, data_len)
@@ -62,11 +61,11 @@
 //FUNCTION PROTOTYPES
 //#############################
 void init_usart0(void);
-void tx_usart0( char data);
+void tx_usart0(unsigned char data);
-char rx_usart0(void);
+unsigned char rx_usart0(void);
 
-void serial0_write( char* buffer, uint8_t write_length);
+void serial0_write(unsigned char* buffer, uint8_t write_length);
-void serial0_read( char* buffer, uint8_t buf_length);
+void serial0_read(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);