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/*
* Debugging UART interface
*
* Copyright (c) 2015 Michael Buesch <m@bues.ch>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "debug_uart.h"
#include "util.h"
#include "timer.h"
#include "display.h"
#include <avr/io.h>
#include <avr/wdt.h>
static bool debug_enabled;
static void debug_uart_enable(void)
{
/* Enable UART transmitter. */
UCSR0B |= (1 << TXEN0);
}
static void debug_uart_disable(void)
{
/* Disable UART transmitter. */
UCSR0B &= (uint8_t)~(1 << TXEN0);
}
static void debug_uart_tx(uint8_t byte)
{
/* Wait for USART data register empty. */
while (!(UCSR0A & (1 << UDRE0)))
wdt_reset();
/* Transmit the byte. */
UDR0 = byte;
}
static void debug_uart_tx_string(const char __memx *str)
{
char c;
while (1) {
c = *str;
if (c == '\0')
break;
debug_uart_tx((uint8_t)c);
str++;
}
}
static void debug_uart_tx_eol(void)
{
debug_uart_tx((uint8_t)'\r');
debug_uart_tx((uint8_t)'\n');
}
static void debug_uart_print_timestamp(void)
{
char buf[(sizeof(unsigned int) * 2) + 1];
utoa((unsigned int)(uint16_t)timer_now(), buf, 16);
debug_uart_tx_string(buf);
debug_uart_tx((uint8_t)':');
debug_uart_tx((uint8_t)' ');
}
static void debug_print_str2(const char __flash *str0, const char *str1)
{
uint8_t sreg;
if (!debug_enabled)
return;
sreg = irq_disable_save();
debug_uart_print_timestamp();
if (str0)
debug_uart_tx_string(str0);
if (str1) {
debug_uart_tx((uint8_t)' ');
debug_uart_tx_string(str1);
}
debug_uart_tx_eol();
irq_restore(sreg);
}
void debug_print_int32(const char __flash *prefix, int32_t value)
{
char buf[10 + 1 + 1];
build_assert(sizeof(long) == sizeof(value));
ltoa(value, buf, 10);
debug_print_str2(prefix, buf);
}
void debug_print_int24(const char __flash *prefix, int24_t value)
{
debug_print_int32(prefix, value);
}
void debug_print_int16(const char __flash *prefix, int16_t value)
{
debug_print_int32(prefix, value);
}
void debug_report_int32(const char __flash *prefix,
int32_t *old_value,
int32_t new_value)
{
if (*old_value != new_value) {
*old_value = new_value;
debug_print_int32(prefix, new_value);
}
}
void debug_report_int24(const char __flash *prefix,
int24_t *old_value,
int24_t new_value)
{
if (*old_value != new_value) {
*old_value = new_value;
debug_print_int24(prefix, new_value);
}
}
void debug_report_int16(const char __flash *prefix,
int16_t *old_value,
int16_t new_value)
{
if (*old_value != new_value) {
*old_value = new_value;
debug_print_int16(prefix, new_value);
}
}
void debug_enable(bool enable)
{
debug_enabled = enable;
display_enable(!enable);
if (enable) {
debug_uart_enable();
debug_uart_tx_string(PSTR("\r\nst\r\n"));
} else {
debug_uart_disable();
}
}
bool debug_is_enabled(void)
{
return debug_enabled;
}
void debug_uart_init(void)
{
build_assert(F_CPU == 8000000ul);
/* 9600 baud */
UBRR0 = 51;
UCSR0A = (1 << TXC0) | (0 << U2X0) | (0 << MPCM0);
UCSR0B = (0 << RXCIE0) | (0 << TXCIE0) | (0 << UDRIE0) |
(0 << RXEN0) | (0 << TXEN0) |
(0 << UCSZ02);
UCSR0C = (0 << UMSEL01) | (0 << UMSEL00) |
(0 << UPM01) | (0 << UPM00) |
(1 << USBS0) |
(1 << UCSZ01) | (1 << UCSZ00);
debug_enable(false);
}
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