text: /******************************************************************************
   * The MIT License
   *
   * Copyright (c) 2010 Perry Hung (from libmaple/util.c).
   * Copyright (c) 2012 LeafLabs, LLC.
   *
   * 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.
   *****************************************************************************/
  
  /*
   * STM32F1 implementations for libmaple/util.c hooks
   *
   * These need more love and attention before being made public API
   * (this includes being easily overridable by user code).
   */
  
  #include <libmaple/nvic.h>
  #include <libmaple/gpio.h>
  #include <libmaple/stm32.h>
  #include <libmaple/timer.h>
  #include <libmaple/adc.h>
  #include <libmaple/usart.h>
  
  /* Failed ASSERT()s send out a message using this USART config. */
  #ifndef ERROR_USART
  #define ERROR_USART            USART2
  #define ERROR_USART_BAUD       9600
  #define ERROR_TX_PORT          GPIOA
  #define ERROR_TX_PIN           2
  #endif
  
  /*
   * Disables all peripheral interrupts except USB (when available),
   * turns off commonly-used peripherals. Called by __error() with
   * global interrupts disabled.
   */
  void __lm_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();
  
  #if STM32_HAVE_USB
      /* Turn the USB interrupt back on so the bootloader keeps on functioning */
      nvic_irq_enable(NVIC_USB_HP_CAN_TX);
      nvic_irq_enable(NVIC_USB_LP_CAN_RX0);
  #endif
  }
  
  /*
   * Enable the error USART for writing.
   */
  usart_dev* __lm_enable_error_usart() {
      gpio_set_mode(ERROR_TX_PORT, ERROR_TX_PIN, GPIO_AF_OUTPUT_PP);
      usart_init(ERROR_USART);
      usart_set_baud_rate(ERROR_USART, USART_USE_PCLK, ERROR_USART_BAUD);
      return ERROR_USART;
  }
  