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feat(ulp): add multi-channel ADC init for ULP

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ulp_adc_init() could only configure a single ADC channel, so monitoring
several channels from the ULP on one ADC unit was not possible. Add
ulp_adc_multi_channel_init() to configure multiple channels with
per-channel attenuation while keeping the existing single-channel API
unchanged.

Closes https://github.com/espressif/esp-idf/issues/11160
This commit is contained in:
Meet Patel
2026-06-16 12:50:58 +05:30
parent 8e8ebae7bd
commit c0601e512b
3 changed files with 76 additions and 2 deletions
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components/ulp/test_apps/ulp_riscv/main/test_ulp_riscv.c
+22
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@@ -471,6 +471,28 @@ TEST_CASE("ULP ADC can init-deinit-init", "[ulp]")
TEST_ASSERT_EQUAL(ESP_OK, ulp_adc_deinit());
}
TEST_CASE("ULP ADC can init multiple channels", "[ulp]")
{
/* Initialize the ADC unit and configure the first channel */
ulp_adc_cfg_t riscv_adc_cfg = {
.adc_n = ADC_UNIT,
.channel = ADC_CHANNEL_5,
.width = WIDTH,
.atten = ADC_ATTEN_DB_2_5,
.ulp_mode = ADC_ULP_MODE_FSM,
};
TEST_ASSERT_EQUAL(ESP_OK, ulp_adc_init(&riscv_adc_cfg));
/* Configure an additional channel on the same ADC unit */
ulp_adc_chan_cfg_t chan_cfg = {
.atten = ADC_ATTEN_DB_12,
.bitwidth = WIDTH,
};
TEST_ASSERT_EQUAL(ESP_OK, ulp_adc_config_channel(ADC_UNIT, ADC_CHANNEL_6, &chan_cfg));
TEST_ASSERT_EQUAL(ESP_OK, ulp_adc_deinit());
}
TEST_CASE("Test ULP RISCV delay", "[ulp]")
{
int64_t start, diff;