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/******************************************************************************
* The MIT License
*
* Copyright (c) 2010 Perry Hung.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*****************************************************************************/
/**
* @file libmaple/util.c
* @brief Utility procedures for debugging
*/
#include <libmaple/libmaple.h>
#include <libmaple/usart.h>
#include <libmaple/gpio.h>
#include <libmaple/nvic.h>
/* (Undocumented) hooks used by Wirish to direct our behavior here */
extern __weak void __lm_error(void);
extern __weak usart_dev* __lm_enable_error_usart(void);
/* If you define ERROR_LED_PORT and ERROR_LED_PIN, then a failed
* ASSERT() will also throb() an LED connected to that port and pin.
*/
#if defined(ERROR_LED_PORT) && defined(ERROR_LED_PIN)
#define HAVE_ERROR_LED
#endif
/* (Called from exc.S with global interrupts disabled.) */
__attribute__((noreturn)) void __error(void) {
if (__lm_error) {
__lm_error();
}
/* Reenable global interrupts */
nvic_globalirq_enable();
throb();
}
/*
* Print an error message on a UART upon a failed assertion (if one is
* available), and punt to __error().
*
* @param file Source file of failed assertion
* @param line Source line of failed assertion
* @param exp String representation of failed assertion
* @sideeffect Turns of all peripheral interrupts except USB.
*/
void _fail(const char* file, int line, const char* exp) {
if (__lm_enable_error_usart) {
/* Initialize the error USART */
usart_dev *err_usart = __lm_enable_error_usart();
/* Print failed assert message */
usart_putstr(err_usart, "ERROR: FAILED ASSERT(");
usart_putstr(err_usart, exp);
usart_putstr(err_usart, "): ");
usart_putstr(err_usart, file);
usart_putstr(err_usart, ": ");
usart_putudec(err_usart, line);
usart_putc(err_usart, '\n');
usart_putc(err_usart, '\r');
}
/* Shutdown and error fade */
__error();
}
/*
* Provide an __assert_func handler to libc so that calls to assert()
* get redirected to _fail.
*/
void __assert_func(const char* file, int line, const char* method,
const char* expression) {
_fail(file, line, expression);
}
/*
* Provide an abort() implementation that aborts execution and punts
* to __error().
*/
void abort() {
if (__lm_enable_error_usart) {
/* Initialize the error USART */
usart_dev *err_usart = __lm_enable_error_usart();
/* Print abort message. */
usart_putstr(err_usart, "ERROR: PROGRAM ABORTED VIA abort()\r\n");
}
/* Shutdown and error fade */
__error();
}
/* This was public as of v0.0.12, so we've got to keep it public. */
/**
* @brief Fades the error LED on and off
* @sideeffect Sets output push-pull on ERROR_LED_PIN.
*/
__attribute__((noreturn)) void throb(void) {
#ifdef HAVE_ERROR_LED
int32 slope = 1;
uint32 CC = 0x0000;
uint32 TOP_CNT = 0x0200;
uint32 i = 0;
gpio_set_mode(ERROR_LED_PORT, ERROR_LED_PIN, GPIO_MODE_OUTPUT);
/* Error fade. */
while (1) {
if (CC == TOP_CNT) {
slope = -1;
} else if (CC == 0) {
slope = 1;
}
if (i == TOP_CNT) {
CC += slope;
i = 0;
}
if (i < CC) {
gpio_write_bit(ERROR_LED_PORT, ERROR_LED_PIN, 1);
} else {
gpio_write_bit(ERROR_LED_PORT, ERROR_LED_PIN, 0);
}
i++;
}
#else
/* No error LED is defined; do nothing. */
while (1)
;
#endif
}
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