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Segment fault!

STM32 HAL 重定向printf函数输出到串口

#ifdef __GNUC__
#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#else
#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
#endif
PUTCHAR_PROTOTYPE
{
    HAL_StatusTypeDef sd = HAL_UART_Transmit(&huart3, (uint8_t *)&ch, 1, 0xFFFF);

    return ch;
}

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