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Merge pull request #21223 from crasbe/pr/adc_test

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tests/adc: always test all resolutions
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mguetschow 2025-02-20 10:08:28 +00:00 committed by GitHub
commit 88f2e451ca
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2 changed files with 19 additions and 12 deletions
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8
tests/periph/adc/README.md
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@ -6,8 +6,12 @@ continuously streamed to std-out.
Background Background
========== ==========
This test application will initialize each configured ADC lines to sample with This test application will initialize each configured ADC lines to sample with
10-bit accuracy. Once configured the application will continuously convert each 6 to 16-bit accuracy. Once configured the application will continuously convert
available channel and print the conversion results to std-out. each available channel with each available resolution and print the conversion
results to std-out.
Not all MCUs support all resolutions and unsupported resolutions should be
printed as -1.
For verification of the output connect the ADC pins to known voltage levels For verification of the output connect the ADC pins to known voltage levels
and compare the output. and compare the output.

23
tests/periph/adc/main.c
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@ -23,16 +23,15 @@
#include "ztimer.h" #include "ztimer.h"
#include "periph/adc.h" #include "periph/adc.h"
#define RES ADC_RES_10BIT
#define DELAY_MS 100U #define DELAY_MS 100U
int main(void) int main(void)
{ {
int sample = 0;
puts("\nRIOT ADC peripheral driver test\n"); puts("\nRIOT ADC peripheral driver test\n");
puts("This test will sample all available ADC lines once every 100ms with\n" puts("This test will sample all available ADC lines once every 100ms with\n"
"a 10-bit resolution and print the sampled results to STDIO\n\n"); "6 to 16-bit resolution and print the sampled results to STDOUT.\n"
"Not all MCUs support all resolutions, unsupported resolutions\n"
"are printed as -1.\n");
/* initialize all available ADC lines */ /* initialize all available ADC lines */
for (unsigned i = 0; i < ADC_NUMOF; i++) { for (unsigned i = 0; i < ADC_NUMOF; i++) {
@ -46,13 +45,17 @@ int main(void)
while (1) { while (1) {
for (unsigned i = 0; i < ADC_NUMOF; i++) { for (unsigned i = 0; i < ADC_NUMOF; i++) {
sample = adc_sample(ADC_LINE(i), RES); int sample6 = adc_sample(ADC_LINE(i), ADC_RES_6BIT);
if (sample < 0) { int sample8 = adc_sample(ADC_LINE(i), ADC_RES_8BIT);
printf("ADC_LINE(%u): selected resolution not applicable\n", i); int sample10 = adc_sample(ADC_LINE(i), ADC_RES_10BIT);
} else { int sample12 = adc_sample(ADC_LINE(i), ADC_RES_12BIT);
printf("ADC_LINE(%u): %i\n", i, sample); int sample14 = adc_sample(ADC_LINE(i), ADC_RES_14BIT);
} int sample16 = adc_sample(ADC_LINE(i), ADC_RES_16BIT);
printf("ADC_LINE(%u): %2i %3i %4i %4i %5i %5i\n", i, sample6, sample8, sample10,
sample12, sample14, sample16);
} }
putchar('\n');
ztimer_sleep(ZTIMER_MSEC, DELAY_MS); ztimer_sleep(ZTIMER_MSEC, DELAY_MS);
} }