From 5b265a5258059dc8aa1199cc102d162cc7a0f721 Mon Sep 17 00:00:00 2001
From: jakegoodwin <jakegoodwin@tutanota.com>
Date: Mon, 16 Jan 2023 20:30:36 -0800
Subject: [PATCH] Added prototypes to header and function defs for runtime
 functions to change parity and stop bits.

---
 avr_usart.c | 67 +++++++++++++++++++++++++++++++++++++++++++++++++----
 avr_usart.h |  9 +++++--
 2 files changed, 70 insertions(+), 6 deletions(-)

diff --git a/avr_usart.c b/avr_usart.c
index 9314d74..23574f0 100644
--- a/avr_usart.c
+++ b/avr_usart.c
@@ -15,6 +15,7 @@
 //Globals
 //#############################
 
+
 int main() {
  
     led_blink();
@@ -53,7 +54,8 @@ int main() {
 /*
  * Input: None
  * Output: None
- * Description: init usart0 hardware in async mode
+ * Description: init usart0 hardware in async mode,
+ * This sets up the connection with default params 8-n-1
  */
 void init_usart0(void) {
     //setup stuff for usart communications.
@@ -70,10 +72,7 @@ void init_usart0(void) {
     #else
             UCSR0A &= ~(1<<U2X0);
     #endif
-   
 
-    
-    
     //setting the data frame format
     UCSR0C = (0<<UMSEL01)|(0<<UMSEL00)|    //Async
             (0<<UPM01)|(0<<UPM00)|      //Parity bits
@@ -155,6 +154,66 @@ void serial0_write(unsigned char* buffer, uint8_t write_length) {
 
 }
 
+/*
+ * Input: none
+ * Output: none
+ * Description:
+ */
+void serial0_enable_line_feeds(void) {
+   ; 
+}
+
+/*
+ * Input: none
+ * Output: none
+ * Description:
+ */
+void serial0_enable_carriage_returns(void) {
+    ;
+}
+
+/*
+ * Input: A parity setting as a 8bit uint
+ * Output: none
+ * Description: 0val clears for no parity
+ * 1val sets positive parity
+ * 2val sets negative parity 
+ */
+void serial0_enable_parity_bit(uint8_t pos) {
+    switch(pos) {
+        case 0:
+            UCSR0C &= ~((1<<UPM01)|(1<<UPM00)); //Clear all.
+        case 1:
+            UCSR0C &= ~(1<<UPM00);  //Make sure that the negative parity if off.
+            UCSR0C |= (1<<UPM01);   //Set the positive parity
+        case 2:
+            UCSR0C |= (1<<UPM01)|(1<<UPM00);    //Set both bits for neg parity
+        default:
+            ;//Do nothing, just put here because
+    }
+}
+
+/*
+ * Input: number of stop bits
+ * Output: none
+ * Description:
+ */
+void serial0_set_stop_bits(uint8_t number) {
+    //clear all the set bits to start off.
+    UCSR0C &= ~(1<<USBS0);
+    switch(number) {
+        case 0:
+            ;
+        case 1:
+            ;
+        case 2:
+            UCSR0C |= (1<<USBS0);
+        default:
+            ;
+}
+
+
+
 /*
  * Inupt: A serialbuffer and length
  * Output: None
diff --git a/avr_usart.h b/avr_usart.h
index aed3439..5d64eb0 100644
--- a/avr_usart.h
+++ b/avr_usart.h
@@ -39,6 +39,9 @@
 //#############################
 
 #define USE_U2X 0
+#define CARRIAGE_RETURN 1
+#define LINE_FEED 1
+
 
 
 //#############################
@@ -56,8 +59,10 @@ void serial0_read_with_err_checking(unsigned char* buffer, uint8_t buf_length);
 void serial0_set_baud(uint8_t baud);
 void seiral0_enable_timeouts(uint8_t ms);
 void serial0_flush_rxbuf(void);
-
-
+void serial0_enable_line_feeds(void);
+void serial0_enable_carriage_returns(void);
+void serial0_enable_parity_bit(uint8_t pos);
+void serial0_set_stop_bits(uint8_t number);