Mercurial > hg-public > freeslot / file diff

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/blackbox/driver/rs232.c	Mon Nov 14 20:31:32 2011 +0100
@@ -0,0 +1,64 @@
+#include <util/setbaud.h>
+#include <util/delay.h>
+#include <avr/interrupt.h>
+#include <avr/pgmspace.h>
+#include <stdlib.h>
+#include "../main.h"
+#include "rs232.h"
+
+void RS232_init(void) {
+    // first init UART
+    // set baud rate
+    UBRRH = UBRRH_VALUE;
+    UBRRL = UBRRL_VALUE;
+    #if USE_2X
+        UCSRA |= (1 << U2X);
+    #else
+        UCSRA &= ~(1 << U2X);
+    #endif
+    // enable receiver and transmitter and Rx interrupts
+    UCSRB = (1<<RXEN) | (1<<TXEN)  | (1 << RXCIE);
+    // framing format 8N1
+    UCSRC = (1<<URSEL) | (1<<UCSZ1) | (1<<UCSZ0);
+    // enable interrupts
+    sei();
+}
+
+static void RS232_txc(void) {
+    while (!(UCSRA & (1<<TXC))); // wait for TXC
+    UCSRA &= ~(1<<TXC); // clear TXC
+}
+
+void RS232_putc(char c) {
+    // send char
+    loop_until_bit_is_set(UCSRA, UDRE);
+    UDR = c;
+    //loop_until_bit_is_set(UCSRA, UDRE);
+    //RS232_txc();
+}
+
+void RS232_puts(char* s) {
+    while (*s != 0) {
+        // send char
+        loop_until_bit_is_set(UCSRA, UDRE);
+        UDR = *s;
+        s++;
+    }
+    //loop_until_bit_is_set(UCSRA, UDRE);
+    //RS232_txc();
+}
+
+void RS232_puts_p(char* s) {
+    char c=pgm_read_byte(s);
+    while (c != 0) {
+        // send char
+        loop_until_bit_is_set(UCSRA, UDRE);
+        UDR = c;
+        c=pgm_read_byte(++s);
+    }
+
+    //loop_until_bit_is_set(UCSRA, UDRE);
+    //RS232_txc();
+}
+
+