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ADS1118使用实例
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ADS1118主要应用于对热电偶或者热敏电阻的测量，属于△-∑类型，采样速度为8SPS 至 860SPS，16位，数据通过串行外设接口spi，我应用的ADS1118作为电流电压的采集，mcu用的是stm32f030c8t6。
代码如下： 1、spi的初始化 void SpiInit(void) { RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE); GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStruct.GPIO_Speed = GPIO_Speed_Level_3; GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP; GPIO_InitStruct.GPIO_OType = GPIO_OType_PP; GPIO_InitStruct.GPIO_Pin =GPIO_Pin_3| GPIO_Pin_4 | GPIO_Pin_5; GPIO_Init(ADC_SCK2_BASE, &GPIO_InitStruct); GPIO_InitStruct.GPIO_Mode = GPIO_Mode_OUT; GPIO_InitStruct.GPIO_Pin = ADC_CS2_PIN; GPIO_Init(ADC_CS2_BASE, &GPIO_InitStruct); ADC_CS2_BASE->BSRR = ADC_CS2_PIN; RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE); SPI_Cmd(SPI2, DISABLE); SPI_StructInit(&SPI_InitStruct); SPI_InitStruct.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_32; SPI_InitStruct.SPI_CPHA = SPI_CPHA_2Edge; SPI_InitStruct.SPI_CPOL = SPI_CPOL_Low; SPI_InitStruct.SPI_CRCPolynomial = SPI_CRCLength_16b; SPI_InitStruct.SPI_DataSize = SPI_DataSize_16b; SPI_InitStruct.SPI_Direction = SPI_Direction_2Lines_FullDuplex; SPI_InitStruct.SPI_FirstBit = SPI_FirstBit_MSB; SPI_InitStruct.SPI_Mode = SPI_Mode_Master; SPI_InitStruct.SPI_NSS = SPI_NSS_Soft; SPI_Init(SPI2, &SPI_InitStruct); SPI_RxFIFOThresholdConfig(SPI2, SPI_RxFIFOThreshold_HF); SPI_Cmd(SPI2, ENABLE); }2、定时器的初始化 void Timer1Init(void) { NVIC_InitTypeDef NVIC_InitStructure; TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; // TIM6 clock enable RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM1, ENABLE); // Time base configuration TIM_TimeBaseStructure.TIM_Period = (unsigned int)(TIMER_CLOCK * 0.003); TIM_TimeBaseStructure.TIM_Prescaler = (CORE_CLOCK / TIMER_CLOCK) - 1; TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit(TIM6, &TIM_TimeBaseStructure); TIM6->SR = (uint16_t)~TIM_FLAG_Update; TIM_ITConfig(TIM1, TIM_IT_Update, ENABLE); TIM_Cmd(TIM6, ENABLE); NVIC_InitStructure.NVIC_IRQChannel = TIM1_CC_IRQn; NVIC_InitStructure.NVIC_IRQChannelPriority = 0; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); return; }3、定时器的中断处理函数 在定时器1中断处理函数中根据你的实际应用，通道数量再具体的处理。 |
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