blob: b750683379bf6b9369f01b068db7051d1a45e0ab [file] [log] [blame]
/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* GPIO UART debug printf */
#include "common.h"
#include "printf.h"
#include "registers.h"
#include "timer.h"
#include "util.h"
#define BAUD 38400
#define BIT_PERIOD (1000000 / BAUD)
int debug_txchar(void *context, int c)
{
int i;
timestamp_t st;
int32_t d;
if (c == '\n')
debug_txchar(context, '\r');
c = (c << 1) | (1 << 9);
st = get_time();
for (i = 0; i < 10; ++i) {
STM32_GPIO_BSRR(GPIO_A) = 1 << ((c & 1) ? 15 : 31);
d = (int32_t)st.le.lo + BIT_PERIOD * (i + 1) - get_time().le.lo;
if (d > 0)
udelay(d);
c >>= 1;
}
return 0;
}
void debug_printf(const char *format, ...)
{
va_list args;
va_start(args, format);
vfnprintf(debug_txchar, NULL, format, args);
va_end(args);
}
void panic(const char *msg)
{
}