From 49dd5841857ace6d518ae2e047c1a043d3084620 Mon Sep 17 00:00:00 2001
From: jakegoodwin <jakegoodwin@tutanota.com>
Date: Sat, 14 Jan 2023 13:26:11 -0800
Subject: [PATCH] wrote echoing main test

---
 avr_usart.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/avr_usart.c b/avr_usart.c
index a934434..2dbcd84 100644
--- a/avr_usart.c
+++ b/avr_usart.c
@@ -32,16 +32,18 @@ int main() {
     uint8_t buf_len = 12;
     //unsigned char data[12] = "snd 12chars\0";
     //unsigned char data[1] = "A";
-    unsigned char data = '0'; 
+    unsigned char data[1] = "B"; 
 
     while(1) {
         //serial0_write(data, buf_len);
-        tx_usart0(data);
+        if(data[0] == 0) {
+            data[0] = '!';
+        }
+        tx_usart0(data[0]);
         //serial0_read(data, buf_len);
         //data = rx_usart0();
         serial0_flush_rxbuf();
-        serial0_read(data, 1);
-        //led_blink();     
+        serial0_read_with_err_checking(data, 1);
     }
     
     return 0;
@@ -77,7 +79,8 @@ void init_usart0(void) {
     //setting the data frame format
     //We leave the 2MSB zero for async serial. And we also don't enable
     //parity bits for now. We set a 2bit stop bit and 8bit char size.
-    UCSR0C = (1<<USBS0) | (3<<UCSZ00); 
+    //UCSR0C = (1<<USBS0) | (3<<UCSZ00); 
+    UCSR0C = (1<<USBS0) | (1<<UCSZ00) | (1<<UCSZ01) | (0<<UCSZ02);
 }
 
 
@@ -116,7 +119,9 @@ unsigned char rx_usart0(void) {
 
 void serial0_flush_rxbuf(void) {
     uint8_t none;
-    while( UCSR0A & (1<<RXC0)) none = UDR0;
+    while( UCSR0A & (1<<RXC0)) {
+        none = UDR0;
+    }
 }