Merge pull request 'uart' (#5) from uart into hdlc-interface

Reviewed-on: #5

main.c

@@ -0,0 +1,25 @@
+#include <stdint.h>
+#include "config.h"
+#include <avr/io.h>
+#include <util/delay.h>
+#include <avr/interrupt.h>
+#include "uart_hal.h"
+
+
+int main(void)
+{
+	//example
+	uint8_t data = 'A';
+
+	uart_init(9600,0);
+    uart_send_byte(data);
+	sei();
+    while (1) 
+    {
+		if(uart_read_count() > 0){
+			data = uart_read();
+			uart_send_byte(data);
+		}
+
+    }
+}

uart_module.c

@@ -0,0 +1,82 @@
+#include "uart_hal.h"
+
+volatile static uint8_t rx_buffer[RX_BUFFER_SIZE] = {0};
+volatile static uint16_t rx_count = 0;
+volatile static uint8_t uart_tx_busy = 1;
+// кольцевой буффер
+ISR(USART_RX_vect){
+	
+	volatile static uint16_t rx_write_pos = 0;
+	
+	rx_buffer[rx_write_pos] = UDR0;
+	rx_count++;
+	rx_write_pos++;
+	if(rx_write_pos >= RX_BUFFER_SIZE){
+		rx_write_pos = 0;
+	}
+	
+}
+
+
+ISR(USART_TX_vect){
+	uart_tx_busy = 1;
+}
+
+
+void uart_init(uint32_t baud,uint8_t high_speed){
+	
+	uint8_t speed = 16;
+	
+	if(high_speed != 0){
+		speed = 8;
+		UCSR0A |= 1 << U2X0;
+	}
+	
+	baud = (F_CPU/(speed*baud)) - 1;
+	
+	UBRR0H = (baud & 0x0F00) >> 8;
+	UBRR0L = (baud & 0x00FF);
+	
+	UCSR0B |= (1 << TXEN0) | (1 << RXEN0) | (1 << TXCIE0) | (1 << RXCIE0);
+	
+}
+
+
+void uart_send_byte(uint8_t c){
+	while(uart_tx_busy == 0);
+	uart_tx_busy = 0;
+	UDR0 = c;
+}
+
+void uart_send_array(uint8_t *c,uint16_t len){
+	for(uint16_t i = 0; i < len;i++){
+		uart_send_byte(c[i]);
+	}
+}
+
+void uart_send_string(uint8_t *c){
+	uint16_t i = 0;
+	do{
+		uart_send_byte(c[i]);
+		i++;
+		
+	}while(c[i] != '\0');
+	uart_send_byte(c[i]);
+}
+
+uint16_t uart_read_count(void){
+	return rx_count;
+}
+
+uint8_t uart_read(void){
+	static uint16_t rx_read_pos = 0;
+	uint8_t data = 0;
+	
+	data = rx_buffer[rx_read_pos];
+	rx_read_pos++;
+	rx_count--;
+	if(rx_read_pos >= RX_BUFFER_SIZE){
+		rx_read_pos = 0;
+	}
+	return data;
+}

uart_module.h

@@ -0,0 +1,20 @@
+#ifndef UART_HAL_H_
+#define UART_HAL_H_
+
+
+#include <stdint.h>
+#include "config.h"
+#include <avr/io.h>
+#include <util/delay.h>
+#include <avr/interrupt.h>
+
+#define RX_BUFFER_SIZE 128
+
+void uart_init(uint32_t baud,uint8_t high_speed);
+void uart_send_byte(uint8_t c);
+void uart_send_array(uint8_t *c,uint16_t len);
+void uart_send_string(uint8_t *c);
+uint16_t uart_read_count(void);
+uint8_t uart_read(void);
+
+#endif /* UART_HAL_H_ */