add buffered rx uart

2009-09-20 13:03:03 +02:00
parent d86f0ad5a9
commit a86d9d26bd
5 changed files with 94 additions and 5 deletions
--- a/avr/usbload/shell.c
+++ b/avr/usbload/shell.c
@@ -0,0 +1,65 @@
+/*
+ * =====================================================================================
+ *
+ * ________        .__        __    ________               ____  ________
+ * \_____  \  __ __|__| ____ |  | __\______ \   _______  _/_   |/  _____/
+ *  /  / \  \|  |  \  |/ ___\|  |/ / |    |  \_/ __ \  \/ /|   /   __  \
+ * /   \_/.  \  |  /  \  \___|    <  |    `   \  ___/\   / |   \  |__\  \
+ * \_____\ \_/____/|__|\___  >__|_ \/_______  /\___  >\_/  |___|\_____  /
+ *        \__>             \/     \/        \/     \/                 \/
+ *
+ *                                  www.optixx.org
+ *
+ *
+ *        Version:  1.0
+ *        Created:  07/21/2009 03:32:16 PM
+ *         Author:  david@optixx.org
+ *
+ * =====================================================================================
+ */
+ #include <stdint.h>
+ #include <string.h>
+ #include <avr/io.h>
+ #include <avr/interrupt.h>
+
+ #include "pwm.h"
+ #include "debug.h"
+ #include "info.h"
+ #include "sram.h"
+ 
+ #define RECEIVE_BUF_LEN 40
+ 
+ uint8_t			recv_buf[RECEIVE_BUF_LEN];
+ volatile uint8_t	recv_counter = 0;
+ volatile uint8_t	cr = 0;
+ 
+ISR(USART0_RX_vect)		//	Interrupt for UART Byte received
+{
+  UCSR0B &= (255 - (1<<RXCIE0));//	Interrupts disable for RxD
+  sei();
+  if(recv_counter == (sizeof(recv_buf)-1)) {
+    cr=1;
+    recv_buf[recv_counter]='\0';
+    recv_counter=0;
+    uart_putc('\n');
+    uart_putc(':');
+    uart_putc('>');
+  }
+  recv_buf[recv_counter] = UDR0;
+  uart_putc(recv_buf[recv_counter]); /* do a echo, maybe should reside not in interrupt */
+  if (recv_buf[recv_counter] == 0x0d) {
+    /* recv_buf[recv_counter] = 0; */
+    cr = 1;				//	found a CR, so the application should do something
+    recv_buf[++recv_counter]='\0';  // terminate string
+    recv_counter = 0;
+    uart_putc('\n');
+  } else {
+    // we accept backspace or delete
+    if ((recv_buf[recv_counter] == 0x08 || recv_buf[recv_counter] == 0x7f) && recv_counter > 0) {
+      recv_counter--;
+    } else {
+      recv_counter++;
+    }
+  }
+  UCSR0B |= (1<<RXCIE0);//	Interrupts enable for RxD
+}