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8c574484b8
This flag can be used to enable debugging over uart. Currently only available for boards with the at90usb1287 chip. Signed-off-by: Josef Filzmaier <j.filzmaier@gmx.at>
65 lines
1.2 KiB
C
65 lines
1.2 KiB
C
/*
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* fw/uart.h - Functions needed for debugging over uart
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*
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* Code adapted from http://www.roboternetz.de/wissen/index.php/UART_mit_avr-gcc
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* and http://www.mikrocontroller.net/articles/AVR-GCC-Tutorial
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*
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* Published under the Creative Commons Share-Alike licence
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* https://creativecommons.org/licenses/by-sa/2.0/de/
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*
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* S. Salewski 2007
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*
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* Adapted by
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* Josef Filzmaier 2017
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*/
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#include <avr/io.h>
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#include "uart.h"
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#define USART_BAUD 38400UL
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#define F_CPU 8000000UL
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#define Wait_USART_Ready() while (!(UCSR1A & (1<<UDRE1)))
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#define UART_UBRR (F_CPU/(16L*USART_BAUD)-1)
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// initialize USART, 8N1 mode
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void
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uart_init(void)
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{
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/* TODO: Find a working configuration for uart for the atmega32u2 */
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#if CHIP == at90usb1287
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CLKPR = (1 << CLKPCE);
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CLKPR = 0; // clock prescaler == 0, so we have 16 MHz mpu frequency
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UBRR1 = UART_UBRR;
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UCSR1C = (1 << UCSZ10) | (1 << UCSZ11);
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UCSR1B = (1 << TXEN1);
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do
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{
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UDR1;
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}
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while (UCSR1A & (1 << RXC1));
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#endif
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}
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int uart_write_char(char c, FILE* stream)
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{
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if (c == '\n'){
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uart_new_line();
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}
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else {
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Wait_USART_Ready();
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UDR1 = c;
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}
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return 0;
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}
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void
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uart_new_line(void)
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{
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Wait_USART_Ready();
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UDR1 = '\r';
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Wait_USART_Ready();
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UDR1 = '\n';
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}
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