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AVR_ATMEGA_USART
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Added prototypes to header and function defs for runtime functions to change parity and stop bits.

This commit is contained in:
Jake Goodwin 2023-01-16 20:30:36 -08:00
parent f4aef61b0e
commit 5b265a5258
2 changed files with 70 additions and 6 deletions
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67
avr_usart.c
View File

@ -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.
@ -71,9 +73,6 @@ void init_usart0(void) {
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

9
avr_usart.h
View File

@ -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);