Elron_dev/elbear_arduino_bsp
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при измерении ацп накапливает некоторое кол-во измерений и усредняет их

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klassents 2024-09-11 16:49:08 +07:00
parent 8f0a5b0a94
commit b94459ebae
1 changed files with 14 additions and 4 deletions
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18
cores/arduino/wiring_analog.c
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@ -11,6 +11,8 @@ extern "C" {
extern void ErrorMsgHandler(const char * msg); extern void ErrorMsgHandler(const char * msg);
// -------------------------- Analog read -------------------------- // // -------------------------- Analog read -------------------------- //
#define ADC_SAMPLES_QTY 10 // samples quantity for averaging adc results
// structure for ADC channel initialization. Only the channel number // structure for ADC channel initialization. Only the channel number
// changes, everything else is the same // changes, everything else is the same
static ADC_HandleTypeDef hadc = static ADC_HandleTypeDef hadc =
@ -44,11 +46,19 @@ uint32_t analogRead(uint32_t PinNumber)
hadc.Init.Sel = adcChannel; hadc.Init.Sel = adcChannel;
HAL_ADC_Init(&hadc); HAL_ADC_Init(&hadc);
// start the conversion twice in case another channel was polled before // start the dummy conversion in case another channel was polled before
HAL_ADC_SINGLE_AND_SET_CH(hadc.Instance, adcChannel); HAL_ADC_SINGLE_AND_SET_CH(hadc.Instance, adcChannel);
value = HAL_ADC_WaitAndGetValue(&hadc); HAL_ADC_WaitAndGetValue(&hadc);
HAL_ADC_Single(&hadc);
value = HAL_ADC_WaitAndGetValue(&hadc); // accumulate results
uint32_t acc = 0;
for (uint8_t i = 0; i<ADC_SAMPLES_QTY; i++)
{
HAL_ADC_Single(&hadc);
acc += HAL_ADC_WaitAndGetValue(&hadc);
}
// get value by averaging
value = acc/ADC_SAMPLES_QTY;
} }
else else
ErrorMsgHandler("analogRead(): invalid analog pin number"); ErrorMsgHandler("analogRead(): invalid analog pin number");