STM32F7xx —— ADC

 

基础知识参考：ADC   

 

/*****************************************************************************
*          ADC1     ADC2     ADC3
* 通道0    PA0      PA0      PA0
* 通道1    PA1      PA1      PA1
* 通道2    PA2      PA2      PA2
* 通道3    PA3      PA3      PA3
* 通道4    PA4      PA4      PF6
* 通道5    PA5      PA5      PF7
* 通道6    PA6      PA6      PF8
* 通道7    PA7      PA7      PF9
* 通道8    PB0      PB0      PF10
* 通道9    PB1      PB1      PF3
* 通道10   PC0      PC0      PC0
* 通道11   PC1      PC1      PC1
* 通道12   PC2      PC2      PC2
* 通道13   PC3      PC3      PC3
* 通道14   PC4      PC4      PF4
* 通道15   PC5      PC5      PF5
* 通道18   温度传感器
*****************************************************************************/
static ADC_HandleTypeDef adc_handle;static void adc_gpio_init(void)
{}static void adc_mode_init(void)
{__HAL_RCC_ADC1_CLK_ENABLE();adc_handle.Instance = ADC1;adc_handle.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;adc_handle.Init.Resolution = ADC_RESOLUTION_12B; //12 位模式adc_handle.Init.DataAlign = ADC_DATAALIGN_RIGHT; //右对齐adc_handle.Init.ScanConvMode = DISABLE; //非扫描模式adc_handle.Init.EOCSelection = DISABLE; //关闭 EOC 中断adc_handle.Init.ContinuousConvMode = DISABLE; //关闭连续转换adc_handle.Init.NbrOfConversion = 1;adc_handle.Init.DiscontinuousConvMode = DISABLE; //禁止不连续采样模式adc_handle.Init.NbrOfDiscConversion = 0; //不连续采样通道数为 0adc_handle.Init.ExternalTrigConv = ADC_SOFTWARE_START; //软件触发adc_handle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE; //使用软件触发adc_handle.Init.DMAContinuousRequests = DISABLE; //关闭 DMA 请求HAL_ADC_Init(&adc_handle);
}void ADCInit(void)
{adc_gpio_init();adc_mode_init();
}uint16_t ADCGet(uint32_t channel)
{ADC_ChannelConfTypeDef adc_config;adc_config.Channel = channel;adc_config.Rank = 1;adc_config.SamplingTime = ADC_SAMPLETIME_480CYCLES;adc_config.Offset = 0;HAL_ADC_ConfigChannel(&adc_handle, &adc_config);HAL_ADC_Start(&adc_handle);HAL_ADC_PollForConversion(&adc_handle, 10); //轮询转换return (uint16_t)HAL_ADC_GetValue(&adc_handle);
}float ADCAverageGet(uint32_t channel, uint16_t times)
{float temp;uint32_t value = 0, average;uint16_t i;for(i = 0; i < times; ++i){value += ADCGet(channel);}average = value / times;temp = (float)average * (3.3 / 4096);return temp;
}// T = ((Vsense - V25) / avg_slope) + 25;
// V25:Vsense在25°时的数值(0.76)
// avg_slope:温度与Vsense曲线的平均斜率(2.5mV/度)
float ADCSocInnerTemperature(void)
{float temperature;temperature = ADCAverageGet(ADC_CHANNEL_TEMPSENSOR, 10);temperature = (temperature - 0.76f) * 400 + 25;printf("%f\r\n", temperature);return temperature;
}