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Synopsis

int sub_adc_single( sub_handle hndl, int* data, int mux );

int sub_adc_read( sub_handle hndl, int* data, int* mux, int reads );

Read single or multiple ADC conversion result(s)

Parameters

•data - buffer to store conversion result(s)

•mux - ADC input channel multiplexer control code(s). See table below.

•reads - number of results to read

ADC mux code	Single Ended	Differential Positive	Differential Negative	Gain
ADC_S0	ADC0	N.A.
ADC_S1	ADC1
ADC_S2	ADC2
ADC_S3	ADC3
ADC_S4	ADC4
ADC_S5	ADC5
ADC_S6	ADC6
ADC_S7	ADC7
ADC_D10_10X	N.A.	ADC1	ADC0	10
ADC_D10_200X		ADC1	ADC0	200
ADC_D32_10X		ADC3	ADC2	10
ADC_D32_200X		ADC3	ADC2	200
ADC_D01		ADC0	ADC1	N.A.
ADC_D21		ADC2	ADC1
ADC_D31		ADC3	ADC1
ADC_D41		ADC4	ADC1
ADC_D51		ADC5	ADC1
ADC_D61		ADC6	ADC1
ADC_D71		ADC7	ADC1
ADC_D02		ADC0	ADC2
ADC_D12		ADC2	ADC2
ADC_D32		ADC3	ADC2
ADC_D42		ADC4	ADC2
ADC_D52		ADC5	ADC2
ADC_1_1V	Internal 1.1V	N.A.
ADC_GND	Analog GND	N.A.

ADC Result

For single ended conversion:

For differential:

ADC is a result of conversion. Note that the result of differential conversion is signed and can be negative.

Return value

On success function returns 0. Otherwise error code.

Example

int adc, adc_buf[3], adc_mux[3];

sub_adc_single( fd, &adc, ADC_S0 ); /* Read ADC on ADC0 input */

adc_mux[0] = ADC_S0;

adc_mux[1] = ADC_S2;

adc_mux[2] = ADC_S3;

sub_adc_read( fd, adc_buf, adc_mux, 3 ); /* Read ADC on ADC0,2,3 inputs */