Analog data conversion utilities

Utility functions for converting analog data samples.

int32_t adc_util_map(int sample, cc2538/include/periph_cpu.h::adc_res_t res, int32_t min, int32_t max)

Map a sampled ADC value to a given range.

This function is useful for converting sampled ADC values into their physical representation.

Parameters

sample:sampled ADC value res:ADC resolution min:the lower bound of the target interval max:the upper bound of the target interval

Return values

• the mapped value

float adc_util_mapf(int sample, cc2538/include/periph_cpu.h::adc_res_t res, float min, float max)

Map a sampled ADC value to a given range (using floating point arithmetics)

See also

analog_util.h::adc_util_map()

Parameters

sample:sampled ADC value res:ADC resolution min:the lower bound of the target interval max:the upper bound of the target interval

Return values

• the mapped value

uint16_t dac_util_map(int value, int min, int max)

Map a value out of the given range to a 16-bit unsigned int.

The min value is assumed to be smaller than max value and value is assumed to be between min and max.

Parameters

value:value to map to a DAC set value min:the lower bound of the source interval max:the upper bound of the source interval

Return values

• the mapped value

uint16_t dac_util_mapf(float value, float min, float max)

Helper function to map a given float value range to a valid DAC value.

See also

analog_util.h::dac_util_map()

Parameters

value:value to map to a DAC set value min:the lower bound of the source interval max:the upper bound of the source interval

Return values

• the mapped value