stm32用spi读取dt50，把clk的io配置放在cs信号io配置后就只能读到0xffff，数据后面不变

限量版萝卜

代码如下，只有把pb13放在12前面才对

GPIO_InitTypeDef GPIO_InitStructure;
        SPI_InitTypeDef SPI_InitStructure;
        TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
        NVIC_InitTypeDef NVIC_InitStructure;
       
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
        RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2|RCC_APB1Periph_TIM4,ENABLE);
       
                //ADS8320òy½ÅÅäÖÃ
        /*----SPI_SCLK----PB13----*/         //ê±ÖóDÅoÅ
        /*----SPI_SDO----PB14----*/          //′®DDêä3ö
        /*----CS/SHDN----PB12----*/          //ê1ÄüDÅoÅ
                GPIO_InitStructure.GPIO_Pin = GPIO_Pin_14;//clkDÅoÅio±ØDëÏèóúcsDÅoÅ
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
        GPIO_Init(GPIOB, &GPIO_InitStructure);

       GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
        GPIO_Init(GPIOB, &GPIO_InitStructure);

        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
        GPIO_Init(GPIOB, &GPIO_InitStructure);

        SPI_Cmd(SPI2, DISABLE);
        SPI_InitStructure.SPI_Direction =SPI_Direction_2Lines_FullDuplex;//Ë«ÏßË«Ïòè«Ë«1¤
        SPI_InitStructure.SPI_Mode = SPI_Mode_Master;//éèÎaÖ÷SPI
        SPI_InitStructure.SPI_DataSize = SPI_DataSize_16b;//·￠Ëí½óêÕ16Ö¡½á11
        SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;//ê±ÖóDü¿Õ¸ß
        SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;//êy¾Y2¶»ñóúμúò»¸öê±ÖóÑØ
        SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;//NSSDÅoÅóéèí¼t1üàí
        SPI_InitStructure.SPI_BaudRatePrescaler =SPI_BaudRatePrescaler_32;//2¨ìØÂêÔ¤·ÖÆμÖμÎa32
        SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;//êy¾Y′«êä′óLSB¿aê¼
        SPI_InitStructure.SPI_CRCPolynomial = 7;
        SPI_Init(SPI2, &SPI_InitStructure);
        SPI_Cmd(SPI2, ENABLE);

        NVIC_InitStructure.NVIC_IRQChannel =TIM4_IRQn;
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;
        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
        NVIC_Init(&NVIC_InitStructure);

        TIM_TimeBaseStructure.TIM_Period = 1250-1;
        TIM_TimeBaseStructure.TIM_Prescaler = 144-1;
        TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
        TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
        TIM_TimeBaseInit(TIM4,&TIM_TimeBaseStructure);

        TIM_Cmd(TIM4, ENABLE);
        TIM_ITConfig(TIM4, TIM_IT_Update,ENABLE);            //¿aTIM2ÖD¶Ï  
        TIM_ClearFlag(TIM4, TIM_FLAG_Update);

}
int SPI_Word(u16 word)      
{
    while(SPI_I2S_GetFlagStatus(SPI2,SPI_I2S_FLAG_TXE)==RESET);
    SPI_I2S_SendData(SPI2,word);
    while(SPI_I2S_GetFlagStatus(SPI2,SPI_I2S_FLAG_RXNE)==RESET);
    return SPI_I2S_ReceiveData(SPI2);
}
int ADC_value = 0;
int adc_val = 0;
int Read_ADC_Value(void)
{


   GPIO_ResetBits(GPIOB,GPIO_Pin_12);//ƬѡDÅoÅ,μíμçƽ′￥·￠￡¬ADS8320½øDDò»′Îêy¾Y2é¼ˉ
   ADC_value=SPI_Word(0x0000);   // ¿ÕμÄêy¾Y½»»»Öμ
   GPIO_SetBits(GPIOB,GPIO_Pin_12);//1رÕƬѡ￡¬Æá±Î′óμíμ½¸ßλêy¾Y￡¬Ö»2é¼ˉ′ó¸ßλμ½μíλêy¾Y
        adc_val = ADC_value;
        ADC_value = 0;
   return adc_val;   //·μ»Ø2éÑùÖμ
}
u16 Data[8] = {0};
u8 data = 0;
u16 dis = 0;
void TIM4_IRQHandler(void)
{
        if (TIM_GetITStatus(TIM4,TIM_IT_Update)!= RESET)         
        {
                TIM_ClearFlag(TIM4, TIM_FLAG_Update);   
                Data[data]=Read_ADC_Value();
                data++;
                if(data>9)
                        data=0;
        }
}

限量版萝卜

自顶一波先

592679954zxc

楼主解决没，我也有这个问题

限量版萝卜

592679954zxc 发表于 2019-7-19 17:07
楼主解决没，我也有这个问题

头秃，不知道啊