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AVR_ATMEGA_USART
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set 9600 baud rate, tested and working

This commit is contained in:
Jake Goodwin 2023-01-13 22:47:43 -08:00
parent 290629670d
commit ae1a5d5947
1 changed files with 20 additions and 9 deletions
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29
avr_usart.c
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@ -8,7 +8,7 @@
#include <avr/interrupt.h> #include <avr/interrupt.h>
#include <avr/sleep.h> #include <avr/sleep.h>
#include <util/delay.h> #include <util/delay.h>
#include "avr_at-09.h" #include "avr_usart.h"
//############################# //#############################
@ -23,14 +23,22 @@ int main() {
led_blink(); led_blink();
led_blink(); led_blink();
_delay_ms(1000); _delay_ms(1000);
_delay_ms(1000);
init_usart0(); init_usart0();
//enable interrupts //enable interrupts
sei(); sei();
unsigned char data[] = "AT+WAKE";
while(1) { while(1) {
led_blink(); _delay_ms(1000);
//led_blink();
for(uint8_t i = 0; i < 7; i++) {
tx_usart0(data[i]);
}
} }
return 0; return 0;
@ -48,16 +56,19 @@ int main() {
* Description: init usart0 hardware in async mode * Description: init usart0 hardware in async mode
*/ */
void init_usart0(void) { void init_usart0(void) {
DDRB |= (1<<TX_DDR)|(0<<RX_DDR); //DDRB |= (1<<TX_DDR)|(0<<RX_DDR);
PORTD |= (0<<TX_PIN)|(0<<RX_PIN); //PORTD |= (0<<TX_PIN)|(0<<RX_PIN);
//setup stuff for usart communications. //setup stuff for usart communications.
//set baud rate, this is 9600Baud with a 1Mhz clock //set baud rate, this is 9600Baud with a 8Mhz clock
//so it should be equal to 6 or 0x006 //UBRR0H |= (uint8_t) (BT_UBRR>>8);
UBRR0H |= (uint8_t) (BT_UBRR>>8); //UBRR0L |= (uint8_t) BT_UBRR;
UBRR0L |= (uint8_t) BT_UBRR; UBRR0H |= (uint8_t) (0x33>>8);
UBRR0L |= (uint8_t) 0x33;
//Enable recv and Transmit pins, overrides other uses. //Enable recv and Transmit pins, overrides other uses.
//IN the usart control and status register 0B //IN the usart control and status register 0B
UCSR0B = (1<<RXEN0) | (1<<TXEN0); UCSR0B = (1<<RXEN0) | (1<<TXEN0);