dc32-retro-tech-addon/firmware/retro_tech_fw/debug/debug.c

/********************************** (C) COPYRIGHT  *******************************
 * File Name          : debug.c
 * Author             : WCH
 * Version            : V1.0.0
 * Date               : 2022/08/08
 * Description        : This file contains all the functions prototypes for UART
 *                      Printf , Delay functions.
 *********************************************************************************
 * Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
 * Attention: This software (modified or not) and binary are used for 
 * microcontroller manufactured by Nanjing Qinheng Microelectronics.
 *******************************************************************************/
#include <debug.h>

static uint8_t  p_us = 0;
static uint16_t p_ms = 0;

#define DEBUG_DATA0_ADDRESS  ((volatile uint32_t*)0xE00000F4)
#define DEBUG_DATA1_ADDRESS  ((volatile uint32_t*)0xE00000F8)

/*********************************************************************
 * @fn      Delay_Init
 *
 * @brief   Initializes Delay Funcation.
 *
 * @return  none
 */
void Delay_Init(void)
{
    p_us = SystemCoreClock / 8000000;
    p_ms = (uint16_t)p_us * 1000;
}

/*********************************************************************
 * @fn      Delay_Us
 *
 * @brief   Microsecond Delay Time.
 *
 * @param   n - Microsecond number.
 *
 * @return  None
 */
void Delay_Us(uint32_t n)
{
    uint32_t i;

    SysTick->SR &= ~(1 << 0);
    i = (uint32_t)n * p_us;

    SysTick->CMP = i;
    SysTick->CNT = 0;
    SysTick->CTLR |=(1 << 0);

    while((SysTick->SR & (1 << 0)) != (1 << 0));
    SysTick->CTLR &= ~(1 << 0);
}

/*********************************************************************
 * @fn      Delay_Ms
 *
 * @brief   Millisecond Delay Time.
 *
 * @param   n - Millisecond number.
 *
 * @return  None
 */
void Delay_Ms(uint32_t n)
{
    uint32_t i;

    SysTick->SR &= ~(1 << 0);
    i = (uint32_t)n * p_ms;

    SysTick->CMP = i;
    SysTick->CNT = 0;
    SysTick->CTLR |=(1 << 0);

    while((SysTick->SR & (1 << 0)) != (1 << 0));
    SysTick->CTLR &= ~(1 << 0);
}

/*********************************************************************
 * @fn      USART_Printf_Init
 *
 * @brief   Initializes the USARTx peripheral.
 *
 * @param   baudrate - USART communication baud rate.
 *
 * @return  None
 */
void USART_Printf_Init(uint32_t baudrate)
{
    GPIO_InitTypeDef  GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;

#if (DEBUG == DEBUG_UART1_NoRemap)
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD | RCC_APB2Periph_USART1, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOD, &GPIO_InitStructure);

#elif (DEBUG == DEBUG_UART1_Remap1)
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD | RCC_APB2Periph_USART1 | RCC_APB2Periph_AFIO, ENABLE);
    GPIO_PinRemapConfig(GPIO_PartialRemap1_USART1, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOD, &GPIO_InitStructure);

#elif (DEBUG == DEBUG_UART1_Remap2)
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD | RCC_APB2Periph_USART1 | RCC_APB2Periph_AFIO, ENABLE);
    GPIO_PinRemapConfig(GPIO_PartialRemap2_USART1, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOD, &GPIO_InitStructure);

#elif (DEBUG == DEBUG_UART1_Remap3)
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC | RCC_APB2Periph_USART1 | RCC_APB2Periph_AFIO, ENABLE);
    GPIO_PinRemapConfig(GPIO_FullRemap_USART1, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOC, &GPIO_InitStructure);

#endif

    USART_InitStructure.USART_BaudRate = baudrate;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
    USART_InitStructure.USART_StopBits = USART_StopBits_1;
    USART_InitStructure.USART_Parity = USART_Parity_No;
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStructure.USART_Mode = USART_Mode_Tx;

    USART_Init(USART1, &USART_InitStructure);
    USART_Cmd(USART1, ENABLE);
}

/*********************************************************************
 * @fn      SDI_Printf_Enable
 *
 * @brief   Initializes the SDI printf Function.
 *
 * @param   None
 *
 * @return  None
 */
void SDI_Printf_Enable(void)
{
    *(DEBUG_DATA0_ADDRESS) = 0;
    Delay_Init();
    Delay_Ms(1);
}

/*********************************************************************
 * @fn      _write
 *
 * @brief   Support Printf Function
 *
 * @param   *buf - UART send Data.
 *          size - Data length.
 *
 * @return  size - Data length
 */
__attribute__((used)) 
int _write(int fd, char *buf, int size)
{
    int i = 0;
    int writeSize = size;
#if (SDI_PRINT == SDI_PR_OPEN)
    do
    {

        /**
         * data0  data1 8 bytes
         * data0 The lowest byte storage length, the maximum is 7
         *
         */

        while( (*(DEBUG_DATA0_ADDRESS) != 0u))
        {

        }

        if(writeSize>7)
        {
            *(DEBUG_DATA1_ADDRESS) = (*(buf+i+3)) | (*(buf+i+4)<<8) | (*(buf+i+5)<<16) | (*(buf+i+6)<<24);
            *(DEBUG_DATA0_ADDRESS) = (7u) | (*(buf+i)<<8) | (*(buf+i+1)<<16) | (*(buf+i+2)<<24);

            i += 7;
            writeSize -= 7;
        }
        else
        {
            *(DEBUG_DATA1_ADDRESS) = (*(buf+i+3)) | (*(buf+i+4)<<8) | (*(buf+i+5)<<16) | (*(buf+i+6)<<24);
            *(DEBUG_DATA0_ADDRESS) = (writeSize) | (*(buf+i)<<8) | (*(buf+i+1)<<16) | (*(buf+i+2)<<24);

            writeSize = 0;
        }

    } while (writeSize);

#else

    for(i = 0; i < size; i++){
        while(USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);
        USART_SendData(USART1, *buf++);
    }


#endif
    return writeSize;
}

/*********************************************************************
 * @fn      _sbrk
 *
 * @brief   Change the spatial position of data segment.
 *
 * @return  size: Data length
 */
__attribute__((used)) 
void *_sbrk(ptrdiff_t incr)
{
    extern char _end[];
    extern char _heap_end[];
    static char *curbrk = _end;

    if ((curbrk + incr < _end) || (curbrk + incr > _heap_end))
    return NULL - 1;

    curbrk += incr;
    return curbrk - incr;
}