/**
  **************************************************************************
  * @file     at32f435_437_board.c
  * @brief    set of firmware functions to manage leds and push-button.
  *           initialize delay function.
  **************************************************************************
  *                       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 "at32f435_437_board.h"

/** @addtogroup AT32F435_437_board
  * @{
  */

/** @defgroup BOARD
  * @brief onboard periph driver
  * @{
  */

/* delay macros */
#define STEP_DELAY_MS                    50

/* at-start led resouce array */
gpio_type *led_gpio_port[LED_NUM]        = {LED2_GPIO, LED3_GPIO, LED4_GPIO};
uint16_t led_gpio_pin[LED_NUM]           = {LED2_PIN, LED3_PIN, LED4_PIN};
crm_periph_clock_type led_gpio_crm_clk[LED_NUM] = {LED2_GPIO_CRM_CLK, LED3_GPIO_CRM_CLK, LED4_GPIO_CRM_CLK};

/* delay variable */
static __IO uint32_t fac_us;
static __IO uint32_t fac_ms;

/* support 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;
  }
  /* __use_no_semihosting was requested, but _ttywrch was */
  void _ttywrch(int ch)
  {
    ch = ch;
  }
 #endif
#endif

#if defined (__GNUC__) && !defined (__clang__)
  #define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#else
  #define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
#endif

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

#if defined (__GNUC__) && !defined (__clang__)
int _write(int fd, char *pbuffer, int size)
{
  for(int i = 0; i < size; i ++)
  {
    __io_putchar(*pbuffer++);
  }

  return size;
}
#endif

/**
  * @brief  initialize uart
  * @param  baudrate: uart baudrate
  * @retval none
  */
void uart_print_init(uint32_t baudrate)
{
  gpio_init_type gpio_init_struct;

#if defined (__GNUC__) && !defined (__clang__)
  setvbuf(stdout, NULL, _IONBF, 0);
#endif

  /* enable the uart and gpio clock */
  crm_periph_clock_enable(PRINT_UART_CRM_CLK, TRUE);
  crm_periph_clock_enable(PRINT_UART_TX_GPIO_CRM_CLK, TRUE);

  gpio_default_para_init(&gpio_init_struct);

  /* configure the uart 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_pins = PRINT_UART_TX_PIN;
  gpio_init_struct.gpio_pull = GPIO_PULL_NONE;
  gpio_init(PRINT_UART_TX_GPIO, &gpio_init_struct);

  gpio_pin_mux_config(PRINT_UART_TX_GPIO, PRINT_UART_TX_PIN_SOURCE, PRINT_UART_TX_PIN_MUX_NUM);

  /* configure uart param */
  usart_init(PRINT_UART, baudrate, USART_DATA_8BITS, USART_STOP_1_BIT);
  usart_transmitter_enable(PRINT_UART, TRUE);
  usart_enable(PRINT_UART, TRUE);
}

/**
  * @brief  board initialize interface init led and button
  * @param  none
  * @retval none
  */
void at32_board_init()
{
  /* initialize delay function */
  delay_init();

  /* configure led in at_start_board */
  at32_led_init(LED2);
  at32_led_init(LED3);
  at32_led_init(LED4);
  at32_led_off(LED2);
  at32_led_off(LED3);
  at32_led_off(LED4);

  /* configure button in at_start board */
  at32_button_init();
}

/**
  * @brief  configure button gpio
  * @param  button: specifies the button to be configured.
  * @retval none
  */
void at32_button_init(void)
{
  gpio_init_type gpio_init_struct;

  /* enable the button clock */
  crm_periph_clock_enable(USER_BUTTON_CRM_CLK, TRUE);

  /* set default parameter */
  gpio_default_para_init(&gpio_init_struct);

  /* configure button pin as input with pull-up/pull-down */
  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_pins = USER_BUTTON_PIN;
  gpio_init_struct.gpio_pull = GPIO_PULL_DOWN;
  gpio_init(USER_BUTTON_PORT, &gpio_init_struct);
}

/**
  * @brief  returns the selected button state
  * @param  none
  * @retval the button gpio pin value
  */
uint8_t at32_button_state(void)
{
  return gpio_input_data_bit_read(USER_BUTTON_PORT, USER_BUTTON_PIN);
}

/**
  * @brief  returns which button have press down
  * @param  none
  * @retval the button have press down
  */
button_type at32_button_press()
{
  static uint8_t pressed = 1;
  /* get button state in at_start board */
  if((pressed == 1) && (at32_button_state() != RESET))
  {
    /* debounce */
    pressed = 0;
    delay_ms(10);
    if(at32_button_state() != RESET)
      return USER_BUTTON;
  }
  else if(at32_button_state() == RESET)
  {
    pressed = 1;
  }
  return NO_BUTTON;
}

/**
  * @brief  configure led gpio
  * @param  led: specifies the led to be configured.
  * @retval none
  */
void at32_led_init(led_type led)
{
  gpio_init_type gpio_init_struct;

  /* enable the led clock */
  crm_periph_clock_enable(led_gpio_crm_clk[led], TRUE);

  /* set default parameter */
  gpio_default_para_init(&gpio_init_struct);

  /* configure the led gpio */
  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_OUTPUT;
  gpio_init_struct.gpio_pins = led_gpio_pin[led];
  gpio_init_struct.gpio_pull = GPIO_PULL_NONE;
  gpio_init(led_gpio_port[led], &gpio_init_struct);
}

/**
  * @brief  turns selected led on.
  * @param  led: specifies the led to be set on.
  *   this parameter can be one of following parameters:
  *     @arg LED2
  *     @arg LED3
  *     @arg LED4
  * @retval none
  */
void at32_led_on(led_type led)
{
  if(led > (LED_NUM - 1))
    return;
  if(led_gpio_pin[led])
    led_gpio_port[led]->clr = led_gpio_pin[led];
}

/**
  * @brief  turns selected led off.
  * @param  led: specifies the led to be set off.
  *   this parameter can be one of following parameters:
  *     @arg LED2
  *     @arg LED3
  *     @arg LED4
  * @retval none
  */
void at32_led_off(led_type led)
{
  if(led > (LED_NUM - 1))
    return;
  if(led_gpio_pin[led])
    led_gpio_port[led]->scr = led_gpio_pin[led];
}

/**
  * @brief  turns selected led toggle.
  * @param  led: specifies the led to be set off.
  *   this parameter can be one of following parameters:
  *     @arg LED2
  *     @arg LED3
  *     @arg LED4
  * @retval none
  */
void at32_led_toggle(led_type led)
{
  if(led > (LED_NUM - 1))
    return;
  if(led_gpio_pin[led])
    led_gpio_port[led]->odt ^= led_gpio_pin[led];
}

/**
  * @brief  initialize delay function
  * @param  none
  * @retval none
  */
void delay_init()
{
  /* configure systick */
  systick_clock_source_config(SYSTICK_CLOCK_SOURCE_AHBCLK_NODIV);
  fac_us = system_core_clock / (1000000U);
  fac_ms = fac_us * (1000U);
}

/**
  * @brief  inserts a delay time.
  * @param  nus: specifies the delay time length, in microsecond.
  * @retval none
  */
void delay_us(uint32_t nus)
{
  uint32_t temp = 0;
  SysTick->LOAD = (uint32_t)(nus * fac_us);
  SysTick->VAL = 0x00;
  SysTick->CTRL |= SysTick_CTRL_ENABLE_Msk ;
  do
  {
    temp = SysTick->CTRL;
  }while((temp & 0x01) && !(temp & (1 << 16)));

  SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk;
  SysTick->VAL = 0x00;
}

/**
  * @brief  inserts a delay time.
  * @param  nms: specifies the delay time length, in milliseconds.
  * @retval none
  */
void delay_ms(uint16_t nms)
{
  uint32_t temp = 0;
  while(nms)
  {
    if(nms > STEP_DELAY_MS)
    {
      SysTick->LOAD = (uint32_t)(STEP_DELAY_MS * fac_ms);
      nms -= STEP_DELAY_MS;
    }
    else
    {
      SysTick->LOAD = (uint32_t)(nms * fac_ms);
      nms = 0;
    }
    SysTick->VAL = 0x00;
    SysTick->CTRL |= SysTick_CTRL_ENABLE_Msk;
    do
    {
      temp = SysTick->CTRL;
    }while((temp & 0x01) && !(temp & (1 << 16)));

    SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk;
    SysTick->VAL = 0x00;
  }
}

/**
  * @brief  inserts a delay time.
  * @param  sec: specifies the delay time, in seconds.
  * @retval none
  */
void delay_sec(uint16_t sec)
{
  uint16_t index;
  for(index = 0; index < sec; index++)
  {
    delay_ms(500);
    delay_ms(500);
  }
}

/**
  * @}
  */

/**
  * @}
  */