How to code sr-04 ultrasonic with ch32v003

[anandr16910]

Is there any start up code on how to interface sr-04 to ch32v003 and send the distance readings via UART to terminal window.

[anandr16910]

how to code ultrasonic sr-o4 sensor to CH32V003 board. is there any C header file.?

[alfersi]

Hi,

That's not an issue with any contents of this repository, but since I wrote the code for a test, there you go:

void GPIO_CFG(void)
{
    GPIO_InitTypeDef GPIO_InitStructure = {0};

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_All;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
    GPIO_Init(GPIOC, &GPIO_InitStructure);
    GPIO_Init(GPIOD, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
    GPIO_Init(GPIOD, &GPIO_InitStructure);
    GPIO_WriteBit(GPIOD, GPIO_Pin_5, Bit_RESET);
}

/*********************************************************************
 * @fn      TIM1_OutCompare_Init
 *
 * @brief   Initializes TIM1 output compare.
 *
 * @param   arr - the period value.
 *          psc - the prescaler value.
 *          ccp - the pulse value.
 *
 * @return  none
 */
void TIM1_PWMOut_Init(u16 arr, u16 psc, u16 ccp)
{
    GPIO_InitTypeDef GPIO_InitStructure={0};
    TIM_OCInitTypeDef TIM_OCInitStructure={0};
    TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure={0};

    RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOD | RCC_APB2Periph_TIM1, ENABLE );

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init( GPIOD, &GPIO_InitStructure );

    TIM_TimeBaseInitStructure.TIM_Period = arr;
    TIM_TimeBaseInitStructure.TIM_Prescaler = psc;
    TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit( TIM1, &TIM_TimeBaseInitStructure);

    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = ccp;
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
    TIM_OC1Init( TIM1, &TIM_OCInitStructure );

    TIM_CtrlPWMOutputs(TIM1, ENABLE );
    TIM_OC1PreloadConfig( TIM1, TIM_OCPreload_Disable );
    TIM_ARRPreloadConfig( TIM1, ENABLE );
    TIM_Cmd( TIM1, ENABLE );
}

/*********************************************************************
 * @fn      Input_Capture_Init
 *
 * @brief   Initializes TIM2 input capture.
 *
 * @param   arr - the period value.
 *          psc - the prescaler value.
 *
 * @return  none
 */
void Input_Capture_Init(u16 arr, u16 psc)
{
    GPIO_InitTypeDef        GPIO_InitStructure = {0};
    TIM_ICInitTypeDef       TIM_ICInitStructure = {0};
    TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure = {0};

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOD, &GPIO_InitStructure);
    GPIO_ResetBits(GPIOD, GPIO_Pin_4);

    TIM_TimeBaseInitStructure.TIM_Period = arr;
    TIM_TimeBaseInitStructure.TIM_Prescaler = psc;
    TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0x00;
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStructure);

    TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;
    TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
    TIM_ICInitStructure.TIM_ICFilter = 0x00;
    TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
    TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;

    TIM_PWMIConfig(TIM2, &TIM_ICInitStructure);

    TIM_SelectInputTrigger(TIM2, TIM_TS_TI1FP1);
    TIM_SelectSlaveMode(TIM2, TIM_SlaveMode_Reset);
    TIM_SelectMasterSlaveMode(TIM2, TIM_MasterSlaveMode_Enable);
    TIM_Cmd(TIM2, ENABLE);
}

/*********************************************************************
 * @fn      main
 *
 * @brief   Main program.
 *
 * @return  none
 */
int main(void)
{
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
    SystemCoreClockUpdate();

    GPIO_CFG();

    Input_Capture_Init(40000, (SystemCoreClock/1000000)-1);

    TIM1_PWMOut_Init(UINT16_MAX, (SystemCoreClock/1000000)-1, 10);

    while(1)
    {
        if(TIM_GetCapture2(TIM2)<1100) GPIO_WriteBit(GPIOD, GPIO_Pin_5, Bit_SET);
        else  GPIO_WriteBit(GPIOD, GPIO_Pin_5, Bit_RESET);
    }
}

[anandr16910]

Thanks for the code header file for ultrasonic sensor. I need the interfacing and sending distance measurements from sr-04 to UART module.

[anandr16910]

I mean I will check the other details.