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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.
*****************************************************************************/
/**
* @brief Utility procedures for debugging, mostly an error LED fade
* and messages dumped over a uart for failed asserts.
*/
#include "libmaple.h"
#include "usart.h"
#include "gpio.h"
#include "nvic.h"
#include "adc.h"
#include "timers.h"
/* Failed asserts send out a message on this USART. */
#ifndef ERROR_USART_NUM
#define ERROR_USART_NUM USART2
#define ERROR_USART_BAUD 9600
#define ERROR_TX_PORT GPIOA
#define ERROR_TX_PIN 2
#endif
/* If you define ERROR_LED_PORT and ERROR_LED_PIN, then a failed
assert will also throb an LED connected to that port an pin.
FIXME this should work together with wirish somehow. */
#if defined(ERROR_LED_PORT) && defined(ERROR_LED_PIN)
#define HAVE_ERROR_LED
#endif
/**
* @brief Disables all peripheral interrupts except USB and fades the
* error LED.
*
* Called from exc.S with global interrupts disabled.
*/
void __error(void) {
/* Turn off peripheral interrupts */
nvic_irq_disable_all();
/* Turn off timers */
timer_disable_all();
/* Turn off ADC */
adc_disable_all();
/* Turn off all usarts */
usart_disable_all();
/* Turn the USB interrupt back on so the bootloader keeps on functioning */
nvic_irq_enable(NVIC_INT_USBHP);
nvic_irq_enable(NVIC_INT_USBLP);
/* Reenable global interrupts */
nvic_globalirq_enable();
throb();
}
/**
* @brief Prints an error message on a uart upon a failed assertion
* and error throbs.
* @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) {
/* Initialize the error usart */
gpio_set_mode(ERROR_TX_PORT, ERROR_TX_PIN, GPIO_AF_OUTPUT_PP);
usart_init(ERROR_USART_NUM, ERROR_USART_BAUD);
/* Print failed assert message */
usart_putstr(ERROR_USART_NUM, "ERROR: FAILED ASSERT(");
usart_putstr(ERROR_USART_NUM, exp);
usart_putstr(ERROR_USART_NUM, "): ");
usart_putstr(ERROR_USART_NUM, file);
usart_putstr(ERROR_USART_NUM, ": ");
usart_putudec(ERROR_USART_NUM, line);
usart_putc(ERROR_USART_NUM, '\n');
usart_putc(ERROR_USART_NUM, '\r');
/* Error fade */
__error();
}
/**
* @brief Fades the error LED on and off
* @sideeffect Sets output push-pull on ERROR_LED_PIN.
*/
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_OUTPUT_PP);
/* 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 connected; do nothing. */
while (1)
;
#endif
}
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