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drivers: adc: iadc_gecko: select proper bits from sample

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Only 12-bit resolution is currently available in the driver,
and each of the 16-bit samples store the actual data
aligned to the left.
A sample should be shifted 4 bits to the right to allow
proper interpretation.

Signed-off-by: Wojciech Sipak <wsipak@antmicro.com>
This commit is contained in:
Wojciech Sipak 2023-07-07 12:50:32 +02:00 • committed by Carles Cufí
commit 48fc80fa79
1 changed files with 2 additions and 1 deletions
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3
drivers/adc/iadc_gecko.c
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@ -20,6 +20,7 @@ LOG_MODULE_REGISTER(iadc_gecko, CONFIG_ADC_LOG_LEVEL);
/* Number of channels available. */
#define GECKO_CHANNEL_COUNT 16
#define GECKO_INTERNAL_REFERENCE_mV 1210
#define GECKO_DATA_RES12BIT(DATA) ((DATA & 0xFFF0) >> 4);
struct adc_gecko_channel_config {
IADC_CfgAnalogGain_t gain;
@ -231,7 +232,7 @@ static void adc_gecko_isr(void *arg)
if (!err) {
sample = IADC_readSingleResult(iadc);
*data->buffer++ = (uint16_t)sample.data;
*data->buffer++ = GECKO_DATA_RES12BIT((uint16_t)sample.data);
data->channels &= ~BIT(data->channel_id);
if (data->channels) {