#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include "py32f0xx_bsp_printf.h"

#ifdef HAL_UART_MODULE_ENABLED
/**
  * @brief  DEBUG_USART GPIO Config,Mode Config,115200 8-N-1
  * @param  None
  * @retval None
  */
void BSP_USART_Config(void)
{
  GPIO_InitTypeDef  GPIO_InitStruct;

  DEBUG_USART_CLK_ENABLE();

  DebugUartHandle.Instance          = DEBUG_USART;

  DebugUartHandle.Init.BaudRate     = DEBUG_USART_BAUDRATE;
  DebugUartHandle.Init.WordLength   = UART_WORDLENGTH_8B;
  DebugUartHandle.Init.StopBits     = UART_STOPBITS_1;
  DebugUartHandle.Init.Parity       = UART_PARITY_NONE;
  DebugUartHandle.Init.HwFlowCtl    = UART_HWCONTROL_NONE;
  DebugUartHandle.Init.Mode         = UART_MODE_TX_RX;

  HAL_UART_Init(&DebugUartHandle);

  DEBUG_USART_RX_GPIO_CLK_ENABLE();
  DEBUG_USART_TX_GPIO_CLK_ENABLE();

  /**USART GPIO Configuration
    PA2     ------> USART2_TX
    PA3     ------> USART2_RX
    */
  GPIO_InitStruct.Pin = DEBUG_USART_TX_PIN;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_PULLUP;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
  GPIO_InitStruct.Alternate = DEBUG_USART_TX_AF;
  HAL_GPIO_Init(DEBUG_USART_TX_GPIO_PORT, &GPIO_InitStruct);

  GPIO_InitStruct.Pin = DEBUG_USART_RX_PIN;
  GPIO_InitStruct.Alternate = DEBUG_USART_RX_AF;

  HAL_GPIO_Init(DEBUG_USART_RX_GPIO_PORT, &GPIO_InitStruct);

  /* ENABLE NVIC */
  HAL_NVIC_SetPriority(DEBUG_USART_IRQ,0,1);
  HAL_NVIC_EnableIRQ(DEBUG_USART_IRQ );
}

#endif


#if defined (__GNUC__) && !defined (__clang__)
    #define GETCHAR_PROTOTYPE int __io_getchar (void)
    #define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#else
    #define GETCHAR_PROTOTYPE int fgetc(FILE * f)
    #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
{
    HAL_UART_Transmit(&DebugUartHandle, (uint8_t *)&ch, 1, 1000);
    return (ch);
}

GETCHAR_PROTOTYPE
{
    int ch;
    HAL_UART_Receive(&DebugUartHandle, (uint8_t *)&ch, 1, 1000);
    return (ch);
}

#if defined (__GNUC__) && !defined (__clang__)
__attribute__((weak)) int _write(int file, char *ptr, int len)
{
    (void)file;
    int DataIdx;
    for (DataIdx = 0; DataIdx < len; DataIdx++)
    {
        __io_putchar(*ptr++);
    }
    return len;
}
#endif

__attribute__((weak)) int _read(int file, char *ptr, int len)
{
    (void)file;
    int DataIdx;
    for (DataIdx = 0; DataIdx < len; DataIdx++)
    {
        *ptr++ = __io_getchar();
    }
    return len;
}

__attribute__((weak)) int _isatty(int fd)
{
    if (fd >= STDIN_FILENO && fd <= STDERR_FILENO)
        return 1;

    errno = EBADF;
    return 0;
}

__attribute__((weak)) int _close(int fd)
{
    if (fd >= STDIN_FILENO && fd <= STDERR_FILENO)
        return 0;

    errno = EBADF;
    return -1;
}

__attribute__((weak)) int _lseek(int fd, int ptr, int dir)
{
    (void)fd;
    (void)ptr;
    (void)dir;

    errno = EBADF;
    return -1;
}

__attribute__((weak)) int _fstat(int fd, struct stat *st)
{
    if (fd >= STDIN_FILENO && fd <= STDERR_FILENO)
    {
        st->st_mode = S_IFCHR;
        return 0;
    }

    errno = EBADF;
    return 0;
}

__attribute__((weak)) int _getpid(void)
{
  errno = ENOSYS;
  return -1;
}

__attribute__((weak)) int _kill(pid_t pid, int sig)
{
    (void)pid;
    (void)sig;
    errno = ENOSYS;
    return -1;
}