/**
  **************************************************************************
  * @file     main.c
  * @version  v2.0.0
  * @date     2021-11-26
  * @brief    main program
  **************************************************************************
  *                       Copyright notice & Disclaimer
  *
  * The software Board Support Package (BSP) that is made available to 
  * download from Artery official website is the copyrighted work of Artery. 
  * Artery authorizes customers to use, copy, and distribute the BSP 
  * software and its related documentation for the purpose of design and 
  * development in conjunction with Artery microcontrollers. Use of the 
  * software is governed by this copyright notice and the following disclaimer.
  *
  * THIS SOFTWARE IS PROVIDED ON "AS IS" BASIS WITHOUT WARRANTIES,
  * GUARANTEES OR REPRESENTATIONS OF ANY KIND. ARTERY EXPRESSLY DISCLAIMS,
  * TO THE FULLEST EXTENT PERMITTED BY LAW, ALL EXPRESS, IMPLIED OR
  * STATUTORY OR OTHER WARRANTIES, GUARANTEES OR REPRESENTATIONS,
  * INCLUDING BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
  *
  **************************************************************************
  */

#include "at32f413_board.h"
#include "at32f413_clock.h"
#include <stdio.h>


/** @addtogroup AT32F413_periph_examples
  * @{
  */
  
/** @addtogroup 413_PWC_sleep_usart1 PWC_sleep_usart1
  * @{
  */
  
  
/* suport printf function, usemicrolib is unnecessary */

#if (__ARMCC_VERSION > 6000000)
  __asm (".global __use_no_semihosting\n\t");
  void _sys_exit(int x)
  {
    x = x;
  }
  /* __use_no_semihosting was requested, but _ttywrch was */
  void _ttywrch(int ch)
  {
    ch = ch;
  }
  FILE __stdout;
#else
 #ifdef __CC_ARM
  #pragma import(__use_no_semihosting)
  struct __FILE
  {
    int handle;
  };
  FILE __stdout;
  void _sys_exit(int x)
  {
    x = x;
  }
 #endif
#endif

#if defined ( __GNUC__ ) && !defined (__clang__)
  /* with gcc/raisonance, small printf (option ld linker->libraries->small printf set to 'yes') calls

__io_putchar() */
  #define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#else
  #define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
#endif /* __gnuc__ */

/**
  * @brief  retargets the c library printf function to the usart.
  * @param  none
  * @retval none
  */
PUTCHAR_PROTOTYPE
{
  while(usart_flag_get(USART1, USART_TDBE_FLAG) == RESET);
  usart_data_transmit(USART1, ch);
  return ch;
}

/**
  * @brief  usart1 configuration.
  * @param  none
  * @retval none
  */
void usart1_config(uint32_t baudrate)
{
  gpio_init_type gpio_init_struct;

  /* enable the uart1 and gpio clock */
  crm_periph_clock_enable(CRM_USART1_PERIPH_CLOCK, TRUE);
  crm_periph_clock_enable(CRM_GPIOA_PERIPH_CLOCK, TRUE);

  gpio_default_para_init(&gpio_init_struct);

  /* configure the uart1 tx pin */
  gpio_init_struct.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;
  gpio_init_struct.gpio_out_type       = GPIO_OUTPUT_PUSH_PULL;
  gpio_init_struct.gpio_mode           = GPIO_MODE_MUX;
  gpio_init_struct.gpio_pull           = GPIO_PULL_NONE;
  gpio_init_struct.gpio_pins           = GPIO_PINS_9;  
  gpio_init(GPIOA, &gpio_init_struct);

  gpio_init_struct.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;  
  gpio_init_struct.gpio_out_type       = GPIO_OUTPUT_PUSH_PULL;  
  gpio_init_struct.gpio_mode           = GPIO_MODE_INPUT;    
  gpio_init_struct.gpio_pull           = GPIO_PULL_UP;
  gpio_init_struct.gpio_pins           = GPIO_PINS_10;
  gpio_init(GPIOA, &gpio_init_struct);
  
  /* configure uart param */
  nvic_irq_enable(USART1_IRQn, 0, 0);
  
  usart_init(USART1, baudrate, USART_DATA_8BITS, USART_STOP_1_BIT);
  usart_parity_selection_config(USART1, USART_PARITY_NONE);
  usart_transmitter_enable(USART1, TRUE);
  usart_receiver_enable(USART1, TRUE);
  usart_hardware_flow_control_set(USART1,USART_HARDWARE_FLOW_NONE);
  usart_interrupt_enable(USART1, USART_RDBF_INT, TRUE);
  usart_enable(USART1, TRUE);
}

/**
  * @brief  main function.
  * @param  none
  * @retval none
  */
int main(void)
{
  __IO uint32_t index = 0;
  __IO uint32_t systick_index = 0;

  /* congfig the system clock */
  system_clock_config();

  /* init at start board */
  at32_board_init();

  /* config priority group */
  nvic_priority_group_config(NVIC_PRIORITY_GROUP_4);

  /* turn on the led light */
  at32_led_on(LED2);
  at32_led_on(LED3);
  at32_led_on(LED4);

  /* enable pwc clock */
  crm_periph_clock_enable(CRM_PWC_PERIPH_CLOCK, TRUE);

  /* config usart1 */
  usart1_config(115200);

  printf("exit sleep mode by usart1 rdbf interrupt \r\n");

  while(1)
  {
    at32_led_off(LED2);
    at32_led_off(LED3);
    printf("now enter sleep mode \r\n");

    /* save systick register configuration */
    systick_index = SysTick->CTRL;
    systick_index &= ~((uint32_t)0xFFFFFFFE);

    /* disable systick */
    SysTick->CTRL &= (uint32_t)0xFFFFFFFE;

    /* enter sleep mode */
    pwc_sleep_mode_enter(PWC_SLEEP_ENTER_WFI);

    /* restore systick register configuration */
    SysTick->CTRL |= systick_index;

    /* wake up from sleep mode */
    printf("now exit sleep mode by usart1 rdbf interrupt \r\n");

    at32_led_on(LED2);
    for(index = 0; index < 500000; index++);
  }
}

/**
  * @}
  */ 

/**
  * @}
  */ 
