alex/esp-idf
1
0
Fork 0
mirror of https://github.com/espressif/esp-idf.git synced 2025-11-18 10:31:09 +00:00
Code Issues Packages Projects Releases Wiki Activity

adc: no longer support adc2 oneshot mode on esp32c3

Browse Source 
Due to HW limitation, we don't support this anymore. On c3, ADC2 under oneshot mode is not stable.

However, you can enable CONFIG_ADC_ONESHOT_FORCE_USE_ADC2_ON_C3 to force use
ADC2.

Refer to errata to know more details:
https://www.espressif.com/sites/default/files/documentation/esp32-s3_errata_en.pdf
https://www.espressif.com/sites/default/files/documentation/esp32-c3_errata_en.pdf
This commit is contained in:
Armando
2022-12-12 11:01:22 +08:00
committed by morris
parent b4c90c44d2
commit ded528e188
8 changed files with 66 additions and 26 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
docs/en/api-reference/peripherals/adc_oneshot.rst
View File

@@ -154,10 +154,14 @@ Hardware Limitations
- A specific ADC unit can only work under one operating mode at any one time, either continuous mode or oneshot mode. :cpp:func:`adc_oneshot_read` has provided the protection.
.. only:: esp32 or esp32s2 or esp32c3 or esp32s3
.. only:: esp32 or esp32s2 or esp32s3
- ADC2 is also used by the Wi-Fi. :cpp:func:`adc_oneshot_read` has provided the protection between Wi-Fi driver and ADC oneshot mode driver.
.. only:: esp32c3
- ADC2 oneshot mode is no longer supported, due to hardware limitation. The results are not stable. This issue can be found in `ESP32C3 Errata <https://www.espressif.com/sites/default/files/documentation/esp32-c3_errata_en.pdf>`. For compatibility, you can enable :ref:`CONFIG_ADC_ONESHOT_FORCE_USE_ADC2_ON_C3` to force use ADC2.
.. only:: esp32
- ESP32 DevKitC: GPIO 0 cannot be used due to external auto program circuits.