Open Kurs270 opened 1 year ago
Icarus113
commented
1 year ago @Kurs270 Hi, thanks for your report, I can reproduce the scenario. From my immediate idea, this might because the pattern table of the ESP32 is different with other chips.
We'll check this and let you know the updates.
Icarus113
commented
1 year ago @Kurs270 I'm very sorry that the ESP32 ADC DMA mode isn't easy to use.
The ESP32 ADC uses I2S0 DMA to finish its data tranaction (from ADC -> DMA -> memory). However, the ESP32 I2S is not easy to use..
See this picture, as ESP32 ADC result is 16bit, so even:
I (590) TASK: ret is 0, ret_num is 256
I (600) EXAMPLE: Unit: ADC_UNIT_1, Channel: 1, Value: 70
I (600) EXAMPLE: Unit: ADC_UNIT_1, Channel: 2, Value: 190
I (610) EXAMPLE: Unit: ADC_UNIT_1, Channel: 2, Value: 190
I (610) EXAMPLE: Unit: ADC_UNIT_1, Channel: 3, Value: f8d
I (620) EXAMPLE: Unit: ADC_UNIT_1, Channel: 3, Value: f8d
I (630) EXAMPLE: Unit: ADC_UNIT_1, Channel: 4, Value: fff
I (630) EXAMPLE: Unit: ADC_UNIT_1, Channel: 4, Value: fff
I (640) EXAMPLE: Unit: ADC_UNIT_1, Channel: 5, Value: fff
I (640) EXAMPLE: Unit: ADC_UNIT_1, Channel: 5, Value: fff
I (650) EXAMPLE: Unit: ADC_UNIT_1, Channel: 6, Value: fff
I (660) EXAMPLE: Unit: ADC_UNIT_1, Channel: 6, Value: fff
I (660) EXAMPLE: Unit: ADC_UNIT_1, Channel: 7, Value: fff
I (670) EXAMPLE: Unit: ADC_UNIT_1, Channel: 7, Value: fff
I (680) EXAMPLE: Unit: ADC_UNIT_1, Channel: 0, Value: fff
I (680) EXAMPLE: Unit: ADC_UNIT_1, Channel: 0, Value: fff
I (690) EXAMPLE: Unit: ADC_UNIT_1, Channel: 1, Value: 505
I (690) EXAMPLE: Unit: ADC_UNIT_1, Channel: 1, Value: 505
I (700) EXAMPLE: Unit: ADC_UNIT_1, Channel: 2, Value: 250
I (710) EXAMPLE: Unit: ADC_UNIT_1, Channel: 4, Value: fff
I (710) EXAMPLE: Unit: ADC_UNIT_1, Channel: 5, Value: fff
I (720) EXAMPLE: Unit: ADC_UNIT_1, Channel: 5, Value: fff
I (720) EXAMPLE: Unit: ADC_UNIT_1, Channel: 6, Value: fff
I (730) EXAMPLE: Unit: ADC_UNIT_1, Channel: 6, Value: fff
I (740) EXAMPLE: Unit: ADC_UNIT_1, Channel: 7, Value: fff
I (740) EXAMPLE: Unit: ADC_UNIT_1, Channel: 7, Value: fff
I (750) EXAMPLE: Unit: ADC_UNIT_1, Channel: 0, Value: fff
I (750) EXAMPLE: Unit: ADC_UNIT_1, Channel: 0, Value: fff(ignore the data, those pins just floating, see the Channel)
I'm very sorry as I can't make it out, the ESP32 is been a long time... I've recorded this and will try the best to push this process.
What I can suggest now is:
I will also update the programming guide for this issue, at least you guys should have a known issue note.
hephaisto
commented
1 year ago I have the same problem. Did I understand correctly that there will be no fix for this?
baechipower
commented
3 months ago I just noticed a similar problem on the ESP32S3 with 8 channels used as in Espressif's Arduino example. It seems that the sampling frequency plays a role. However the channel order stays the same with a given configuration and seems not to change non-deterministically.
Answers checklist.
IDF version.
v5.1-dev-3035-gd825753387
Operating System used.
Windows
How did you build your project?
VS Code IDE
If you are using Windows, please specify command line type.
CMD
Development Kit.
Esp32-wrover
Power Supply used.
USB
What is the expected behavior?
I changed examples/peripherals/adc/continuous_read/main/continuous_read_main.c to use 4 instead of only 2 adc channels.
//static adc_channel_t channel[2] = {ADC_CHANNEL_6, ADC_CHANNEL_7}; static adc_channel_t channel[] = {ADC_CHANNEL_4, ADC_CHANNEL_5, ADC_CHANNEL_6, ADC_CHANNEL_7};
I would expect the program output to be: I (396) TASK: ret is 0, ret_num is 256 I (396) EXAMPLE: Unit: ADC_UNIT_1, Channel: 4, Value: c07 I (396) EXAMPLE: Unit: ADC_UNIT_1, Channel: 5, Value: 8e6 I (416) EXAMPLE: Unit: ADC_UNIT_1, Channel: 6, Value: 28b I (406) EXAMPLE: Unit: ADC_UNIT_1, Channel: 7, Value: fff I (426) EXAMPLE: Unit: ADC_UNIT_1, Channel: 4, Value: ede I (416) EXAMPLE: Unit: ADC_UNIT_1, Channel: 5, Value: 98b I (436) EXAMPLE: Unit: ADC_UNIT_1, Channel: 6, Value: 390 I (436) EXAMPLE: Unit: ADC_UNIT_1, Channel: 7, Value: fff ...and so on.
What is the actual behavior?
However, the samples are delivered in arbitrary, non-constant order like this. (Samples are ordered in a non-reproducible manner, samples are left out/dropped etc..)
I (396) TASK: ret is 0, ret_num is 256 I (396) EXAMPLE: Unit: ADC_UNIT_1, Channel: 5, Value: 8e6 I (396) EXAMPLE: Unit: ADC_UNIT_1, Channel: 4, Value: c07 I (406) EXAMPLE: Unit: ADC_UNIT_1, Channel: 7, Value: fff I (416) EXAMPLE: Unit: ADC_UNIT_1, Channel: 6, Value: 28b I (416) EXAMPLE: Unit: ADC_UNIT_1, Channel: 5, Value: 98b I (426) EXAMPLE: Unit: ADC_UNIT_1, Channel: 4, Value: ede I (436) EXAMPLE: Unit: ADC_UNIT_1, Channel: 7, Value: fff I (436) EXAMPLE: Unit: ADC_UNIT_1, Channel: 6, Value: 390 I (446) EXAMPLE: Unit: ADC_UNIT_1, Channel: 7, Value: fff I (446) EXAMPLE: Unit: ADC_UNIT_1, Channel: 4, Value: fff I (456) EXAMPLE: Unit: ADC_UNIT_1, Channel: 5, Value: b40 I (466) EXAMPLE: Unit: ADC_UNIT_1, Channel: 4, Value: fff I (466) EXAMPLE: Unit: ADC_UNIT_1, Channel: 7, Value: fff I (476) EXAMPLE: Unit: ADC_UNIT_1, Channel: 6, Value: 561 I (476) EXAMPLE: Unit: ADC_UNIT_1, Channel: 5, Value: c3f I (486) EXAMPLE: Unit: ADC_UNIT_1, Channel: 4, Value: fff I (496) EXAMPLE: Unit: ADC_UNIT_1, Channel: 7, Value: fff I (496) EXAMPLE: Unit: ADC_UNIT_1, Channel: 6, Value: 643 I (506) EXAMPLE: Unit: ADC_UNIT_1, Channel: 7, Value: fff I (506) EXAMPLE: Unit: ADC_UNIT_1, Channel: 6, Value: 71b I (516) EXAMPLE: Unit: ADC_UNIT_1, Channel: 5, Value: e2d I (526) EXAMPLE: Unit: ADC_UNIT_1, Channel: 4, Value: fff I (526) EXAMPLE: Unit: ADC_UNIT_1, Channel: 7, Value: fff I (536) EXAMPLE: Unit: ADC_UNIT_1, Channel: 6, Value: 7ef I (536) EXAMPLE: Unit: ADC_UNIT_1, Channel: 5, Value: f11 I (546) EXAMPLE: Unit: ADC_UNIT_1, Channel: 4, Value: fff I
Steps to reproduce.
do the above changes to continuous_read_main.c, i.e. modify line 36 to read like this: static adc_channel_t channel[] = {ADC_CHANNEL_4, ADC_CHANNEL_5, ADC_CHANNEL_6, ADC_CHANNEL_7};
compile, flash and run.
Debug Logs.
More Information.
The program runs on a development board with all the inputs left open, so I don't know if the values displayed are correct. Anyway, the values should appear in exactly the configured order.