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- 2019-1-14
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10金钱
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,μíμçÆ½′¥·¢£¬ADS8320½øDDò»′Îêy¾Y2é¼ˉ
ADC_value=SPI_Word(0x0000); // ¿ÕμÄêy¾Y½»»»Öμ
GPIO_SetBits(GPIOB,GPIO_Pin_12);//1Ø±ÕÆ¬Ñ¡£¬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;
}
}
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