AN4073 datasheet(27/32 Pages) STMICROELECTRONICS

Part #	AN4073

Description	How to improve ADC accuracy when using STM32F2xx and STM32F4xx microcontrollers

PDF	32 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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27 / 32 page

DocID022945 Rev 5

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AN4073

Averaging of N-X ADC samples: source code

Appendix B

Averaging of N-X ADC samples: source code

/**

* @brief

Get the average of N-X ADC samples

* @param Numbre of ADC samples to be averaged

* @retval The average value

uint16_t ADC_GetSampleAvgNDeleteX(uint8_t N , uint8_t X)

{

uint32_t avg_sample =0x00;

uint16_t adc_sample[8]={0,0,0,0,0,0,0,0};

uint8_t index=0x00;

for (index=0x00; index<N; index++)

{

/* ADC start conv */

ADC_SoftwareStartConv(ADC1);

/* Wait end of conversion */

while(ADC_GetFlagStatus(ADC1,ADC_FLAG_EOC) == RESET);

/* Store ADC samples */

adc_sample[index] = ADC_GetConversionValue(ADC1);

}

/* Sort the N-X ADC samples */

Sort_tab(adc_sample,N);

/* Add the N ADC samples */

for (index=X/2; index<N-X/2; index++)

{

avg_sample += adc_sample[index];

}

/* Compute the average of N-X ADC sample */

avg_sample /= N-X;

/* Return average value */

return avg_sample;

}

/**

AN4073 Datasheet(PDF) 27 Page - STMicroelectronics