Initial commit

libs/uart/uart.c

@@ -0,0 +1,125 @@
+/*
+ * uart.c
+ *
+ */
+
+
+
+#include "uart.h"
+
+char uartReceiveBuffer[UART_RECV_BUFFER_SIZE];
+
+void uart_init() {
+	#if defined (__AVR_ATmega8__)
+		// enable receive and transmit
+		UCSRB |= (1 << RXEN) | (1 << TXEN);
+
+		// set frame format
+		//Set data frame format: asynchronous mode,no parity, 1 stop bit, 8 bit size
+		UCSRC=(1<<URSEL)|(0<<UMSEL)|(0<<UPM1)|(0<<UPM0)|(0<<USBS)|(0<<UCSZ2)|(1<<UCSZ1)|(1<<UCSZ0);
+		//UCSRC |= (1<<URSEL)|(3<<UCSZ0); // async 8n1
+
+		// set baud rate
+		UBRRH = UBRR_VAL >> 8;
+		UBRRL = UBRR_VAL & 0xFF;
+	#elif defined (__AVR_ATmega168P__)
+		// enable receive and transmit
+		UCSR0B = (1<<RXEN0)|(1<<TXEN0);
+
+		// set frame format
+//		UCSR0C = ((1<<UCSZ01)|(1<<UCSZ00))&(0<<USBS0);  // 8n1
+		UCSR0C = (1<<UCSZ01)|(1<<UCSZ00);  // 8n2
+
+		// set baud rate
+		UBRR0H = UBRR_VAL >> 8;
+		UBRR0L = UBRR_VAL;
+	#else
+	#  if !defined(__COMPILING_AVR_LIBC__)
+	#    warning "device type not defined"
+	#  endif
+	#endif
+}
+
+
+// ======================= SEND =======================
+
+
+void uart_sendChar(char c) {
+	#if defined (__AVR_ATmega8__)
+		while (!(UCSRA & (1<<UDRE)));
+		UDR = c;
+	#elif defined (__AVR_ATmega168P__)
+		while (!(UCSR0A & (1<<UDRE0)))  {}
+		UDR0 = c;
+	#else
+	#  if !defined(__COMPILING_AVR_LIBC__)
+	#    warning "device type not defined"
+	#  endif
+	#endif
+}
+
+void uart_sendInt(int c) {
+	char m[7];
+	itoa(c,m,10);
+	uart_sendString(m);
+}
+
+void uart_sendBinary(int c) {
+	char m[7];
+	itoa(c,m,2);
+	uart_sendString(m);
+}
+
+void uart_sendHex(int c) {
+	char m[7];
+	itoa(c,m,16);
+	uart_sendString(m);
+}
+
+
+void uart_sendString(char *s) {
+    while (*s != '\0') {
+    	uart_sendChar(*s);
+        s++;
+    }
+}
+
+void uart_sendLF() {
+   uart_sendChar('\n');
+}
+
+
+// ======================= RECEIVE =======================
+
+char uart_receiveChar() {
+	#if defined (__AVR_ATmega8__)
+		while (!(UCSRA & (1<<RXC)));
+		return UDR;
+	#elif defined (__AVR_ATmega168P__)
+		while ( !(UCSR0A & (1<<RXC0)) );
+		return UDR0;
+	#else
+	#  if !defined(__COMPILING_AVR_LIBC__)
+	#    warning "device type not defined"
+	#  endif
+	#endif
+}
+
+char* uart_receiveString() {
+  char nextChar;
+  char stringLen = 0;
+
+  char *startPtr = uartReceiveBuffer;
+  char *bufferPtr = uartReceiveBuffer;
+
+  nextChar = uart_receiveChar();
+  while( nextChar != '\n' && nextChar != '\0' && stringLen < UART_RECV_BUFFER_SIZE - 1 ) {
+    *(bufferPtr++) = nextChar;
+    stringLen++;
+    nextChar = uart_receiveChar();
+  }
+
+  *bufferPtr = '\0';
+
+  return startPtr;
+}

libs/uart/uart.h

@@ -0,0 +1,41 @@
+/*
+ * uart.h
+ *
+ */
+
+#include <avr/io.h>
+#include <stdlib.h>
+
+#ifndef UART_H_
+#define UART_H_
+
+#define UART_RECV_BUFFER_SIZE 33 // max 32 chars + '\0'
+
+//#define BAUD 19200UL      // Baudrate
+#define BAUD 9600UL      // Baudrate
+
+// Berechnungen
+//#define UBRR_VAL F_CPU/16/BAUD-1
+#define UBRR_VAL ((F_CPU+BAUD*8UL)/(BAUD*16UL)-1UL)   // clever runden
+#define BAUD_REAL (F_CPU/(16UL*(UBRR_VAL+1UL)))     // Reale Baudrate
+#define BAUD_ERROR ((BAUD_REAL*1000)/BAUD) // Fehler in Promille, 1000 = kein Fehler.
+
+#if ((BAUD_ERROR<990) || (BAUD_ERROR>1010))
+  #error Baud rate error greater than 1% - too high!
+#endif
+
+
+void uart_init();
+
+void uart_sendChar(char c);
+void uart_sendString (char *s);
+void uart_sendBinary(int c);
+void uart_sendInt(int c);
+void uart_sendHex(int c);
+void uart_sendLF();
+
+
+char uart_receiveChar();
+char* uart_receiveString();
+
+#endif /* UART_H_ */