From 830c1028c048cae9ea914d9015c9a08f3ccf3d58 Mon Sep 17 00:00:00 2001
From: jakegoodwin <jakegoodwin@tutanota.com>
Date: Mon, 16 Jan 2023 19:43:28 -0800
Subject: [PATCH] rewrote usart init function with some macro stuff.

---
 avr_usart.c | 63 +++++++++++++++++++++++++++++------------------------
 1 file changed, 34 insertions(+), 29 deletions(-)

diff --git a/avr_usart.c b/avr_usart.c
index 2dbcd84..52706a1 100644
--- a/avr_usart.c
+++ b/avr_usart.c
@@ -7,7 +7,6 @@
 #include <avr/io.h>
 #include <avr/interrupt.h>
 #include <avr/sleep.h>
-#include <stdint.h>
 #include <util/delay.h>
 #include "avr_usart.h"
 
@@ -22,28 +21,30 @@ int main() {
     led_blink(); 
     led_blink(); 
     _delay_ms(1000);
-    _delay_ms(1000);
 
     init_usart0(); 
 
     //enable interrupts
     sei();
-    
-    uint8_t buf_len = 12;
-    //unsigned char data[12] = "snd 12chars\0";
-    //unsigned char data[1] = "A";
-    unsigned char data[1] = "B"; 
+    unsigned char linefeed = 0x0a;
+    unsigned char carrigereturn = 0x0d; 
+    //unsigned char data[11] = "snd 11chars";
+    unsigned char data[8] = "AT+BAUD3";
+    unsigned char data_cmd[2] = "AT";
+    uint8_t data_len = 8;
+    uint8_t data_cmd_len = 2;
 
     while(1) {
-        //serial0_write(data, buf_len);
-        if(data[0] == 0) {
-            data[0] = '!';
-        }
-        tx_usart0(data[0]);
-        //serial0_read(data, buf_len);
-        //data = rx_usart0();
-        serial0_flush_rxbuf();
-        serial0_read_with_err_checking(data, 1);
+        led_blink();
+        
+        serial0_write(data, data_len);
+        tx_usart0(carrigereturn);
+        tx_usart0(linefeed);
+        
+
+        //_delay_ms(1000);
+        _delay_ms(500);
+
     }
     
     return 0;
@@ -61,26 +62,30 @@ int main() {
  * Description: init usart0 hardware in async mode
  */
 void init_usart0(void) {
-    //DDRB |= (1<<TX_DDR)|(0<<RX_DDR);
-    //PORTD |= (0<<TX_PIN)|(0<<RX_PIN); 
-    
     //setup stuff for usart communications.
     
-    //set baud rate, this is 9600Baud with a 8Mhz clock
-    //UBRR0H |= (uint8_t) (BT_UBRR>>8);
-    //UBRR0L |= (uint8_t) BT_UBRR;
-    UBRR0H |= (uint8_t) (0x33>>8);
-    UBRR0L |= (uint8_t) 0x33;
+    UBRR0H |= (uint8_t) (BT_UBRR>>8);
+    UBRR0L |= (uint8_t) BT_UBRR;
 
     //Enable recv and Transmit pins, overrides other uses.
     //IN the usart control and status register 0B
     UCSR0B = (1<<RXEN0) | (1<<TXEN0);
-
+    
+    #if USE_U2X
+            UCSR0A |= (1<<U2X0);
+    #else
+            UCSR0A &= ~(1<<U2X0);
+    #endif
+    
+    
     //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) | (1<<UCSZ00) | (1<<UCSZ01) | (0<<UCSZ02);
+    UCSR0C = (0<<UMSEL01)|(0<<UMSEL00)|    //Async
+            (0<<UPM01)|(0<<UPM00)|      //Parity bits
+            (1<<USBS0)|             //Stop bits
+            (0<<UCSZ02)|(1<<UCSZ01)|(1<<UCSZ00)|    //Set the number of bits.
+            (0<<UCPOL0);    //Clock polarity, 0=falling 1=rising
+
+
 }