STM32F7xx —— ADC
基礎知識參考: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 溫度傳感器
*****************************************************************************/
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; //右對齊
adc_handle.Init.ScanConvMode = DISABLE; //非掃描模式
adc_handle.Init.EOCSelection = DISABLE; //關閉 EOC 中斷
adc_handle.Init.ContinuousConvMode = DISABLE; //關閉連續轉換
adc_handle.Init.NbrOfConversion = 1;
adc_handle.Init.DiscontinuousConvMode = DISABLE; //禁止不連續采樣模式
adc_handle.Init.NbrOfDiscConversion = 0; //不連續采樣通道數為 0
adc_handle.Init.ExternalTrigConv = ADC_SOFTWARE_START; //軟體觸發
adc_handle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE; //使用軟體觸發
adc_handle.Init.DMAContinuousRequests = DISABLE; //關閉 DMA 請求
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); //輪詢轉換
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°時的數值(0.76)
// avg_slope:溫度與Vsense曲線的平均斜率(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;
}