Search found 22 matches

by deandob
Thu Nov 25, 2021 7:45 am
Forum: ESP-IDF
Topic: Checking GPIO level in ULP on the ESP32S2
Replies: 2
Views: 4628

Re: Checking GPIO level in ULP on the ESP32S2

Dylan, If I understand you correctly, you are looking for confirmation that with the ESP32-S2: 1) When the ULP wakes up from sleep, it has to re-initialize all the pin settings? 2) Re-initializing the pin settings after ULP wake-up works the first time but not for subsequent wake-ups (the pins are b...
by deandob
Sat Jun 12, 2021 3:38 am
Forum: ESP-IDF
Topic: ESP32-S2 ULP compiling in C
Replies: 2
Views: 2645

Re: ESP32-S2 ULP compiling in C

Hi ESP_Sprite, That documentation was easy to find but wasn't explicit about how to program the ULP in C especially accessing the SDK functions and registers, however from running this sample https://github.com/espressif/esp-idf/tree/master/examples/system/ulp_riscv and updating it was easy to concl...
by deandob
Thu Jun 10, 2021 2:14 am
Forum: ESP-IDF
Topic: ESP32-S2 ULP compiling in C
Replies: 2
Views: 2645

ESP32-S2 ULP compiling in C

All, From the S2 IDF SDK: "The main difference from the FSM ULP is this variant can be programmed in C using standard GNU tools" Can someone explain exactly how to program and compile in C the RISC-V based ULP versus the main Tensilica core. Can all the SDK C commands be treated the same way as we w...
by deandob
Sun May 16, 2021 12:56 am
Forum: ESP-IDF
Topic: usleep as WAIT equivalent on RISC-V ULP
Replies: 2
Views: 3466

Re: usleep as WAIT equivalent on RISC-V ULP

Is there any more information on programming the S2 RISC-V ULP, as Andy mentioned in this thread the IDF documentation isn't helpful to understand how to use the ULP, some examples of common functions would be useful.

Or do we just assume its exactly the same as the non S2 ULP?

Thanks for the help.
by deandob
Sun Mar 15, 2020 9:27 am
Forum: Hardware
Topic: ESP32 Pico D4 Custom PCB not working
Replies: 8
Views: 11400

Re: ESP32 Pico D4 Custom PCB not working

I had a similar problem with the Pico, and solved it by ensuring the decoupling capacitors were placed close to the chip and was very careful with the earth under the chip so that only current destined for the ESP32 was routed via the ground pad, so no other transient current could interfere. My boa...
by deandob
Fri Jan 18, 2019 3:30 am
Forum: Hardware
Topic: Help needed - New ESP32 PICO D4.1 design continously looping with RTCWDT_RTC_RESET
Replies: 22
Views: 24400

Re: Help needed - New ESP32 PICO D4.1 design continously looping with RTCWDT_RTC_RESET

The new board looks to be OK, the problem was the peripheral connection.

Lesson here - even though the PICO is a module on chip it still needs careful attention to PCB layout and decoupling.

Thanks for the help.
by deandob
Sun Jan 13, 2019 4:43 am
Forum: Hardware
Topic: Help needed - New ESP32 PICO D4.1 design continously looping with RTCWDT_RTC_RESET
Replies: 22
Views: 24400

Re: Help needed - New ESP32 PICO D4.1 design continously looping with RTCWDT_RTC_RESET

Hi Alvin, About to head back to work from vacation. I did get this working by doing a different PCB layout and paying a lot of attention to decoupling, ground and layout, and I can get it booting now but not when I attach a peripheral to the GPIOs (won't connect with the programmer). I'll continue d...
by deandob
Fri Dec 21, 2018 8:50 am
Forum: Hardware
Topic: ESP32-PICO-D4 boot loop
Replies: 12
Views: 17262

Re: ESP32-PICO-D4 boot loop

Should be clean due to the RC filter but I will check it (I have another board coming with a better layout, as I suspect the problem is eddie currents in the groundplane).
by deandob
Sun Dec 16, 2018 1:42 am
Forum: Hardware
Topic: ESP32-PICO-D4 boot loop
Replies: 12
Views: 17262

Re: ESP32-PICO-D4 boot loop

I don't understand - if the reset signal is before the resistor then it will be constantly tied to Vcc. The schematic as drawn will have EN/RESET high except for the RC constant during power up, and when the reset button is pressed, will go low to reset the MCU. This is consistent with the PICO D4 d...
by deandob
Mon Dec 10, 2018 8:50 pm
Forum: Hardware
Topic: ESP32-PICO-D4 boot loop
Replies: 12
Views: 17262

Re: ESP32-PICO-D4 boot loop

Good idea, will try that