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https://github.com/Telecominfraproject/OpenCellular.git
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e99512a456
We are running a minimal runtime with less overhead. This allows us to run UART at 38400 bps. Let's update the config for easier debugging. Also fix a potential underflow bug. BUG=None TEST=See debug output at 38400 bps BRANCH=None Change-Id: Ic9e4f9d545f5dbc4a0816a843b0f01a4cf219666 Signed-off-by: Vic (Chun-Ju) Yang <victoryang@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/196190 Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
51 lines
940 B
C
51 lines
940 B
C
/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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/* GPIO UART debug printf */
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#include "board.h"
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#include "common.h"
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#include "printf.h"
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#include "registers.h"
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#include "timer.h"
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#include "util.h"
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#define BAUD 38400
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#define BIT_PERIOD (1000000 / BAUD)
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int debug_txchar(void *context, int c)
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{
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int i;
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timestamp_t st;
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int32_t d;
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if (c == '\n')
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debug_txchar(context, '\r');
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c = (c << 1) | (1 << 9);
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st = get_time();
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for (i = 0; i < 10; ++i) {
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STM32_GPIO_BSRR(GPIO_A) = 1 << ((c & 1) ? 15 : 31);
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d = (int32_t)st.le.lo + BIT_PERIOD * (i + 1) - get_time().le.lo;
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if (d > 0)
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udelay(d);
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c >>= 1;
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}
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return 0;
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}
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void debug_printf(const char *format, ...)
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{
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va_list args;
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va_start(args, format);
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vfnprintf(debug_txchar, NULL, format, args);
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va_end(args);
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}
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void panic(const char *msg)
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{
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}
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