Search found 13 matches

by mikronauts
Fri Dec 13, 2019 5:25 pm
Forum: General Discussion
Topic: Run linux on the ESP32?
Replies: 14
Views: 10726

Re: Run linux on the ESP32?

Take a look at Minix it should fit and does not need an mmu.
by mikronauts
Sun Nov 24, 2019 1:54 am
Forum: ESP32 Arduino
Topic: wifi headache issue with const char * (SOLVED)
Replies: 2
Views: 404

Re: wifi headache issue with const char * (SOLVED)

updating to esp32 1.0.4 in board manager fixed that issue
by mikronauts
Sun Nov 24, 2019 12:53 am
Forum: ESP32 Arduino
Topic: wifi headache issue with const char * (SOLVED)
Replies: 2
Views: 404

Re: wifi headache issue with const char *

nvs would be an ideal solution if it would only return a const char * to the value.
by mikronauts
Sun Nov 24, 2019 12:22 am
Forum: ESP32 Arduino
Topic: wifi headache issue with const char * (SOLVED)
Replies: 2
Views: 404

wifi headache issue with const char * (SOLVED)

problem: I need to attach to different AP's so the requirement for const char * for ssid and password is making using the Arduino ide impossible. Later I will move to the IDF but the Arduino IDE is much faster than the IDF. does anyone have any suggestions? I have already tried different ways of cas...
by mikronauts
Sun Sep 29, 2019 12:14 am
Forum: General Discussion
Topic: How to work with 3 SPI slaves in Arduino ESP32 add-on
Replies: 2
Views: 336

Re: How to work with 3 SPI slaves in Arduino ESP32 add-on

see https://www.mikronauts.com/raspberry-pi/raspberry-pi-analog-to-digital-conversion-experiments-and-howto/ I used a 74HC138N to generate eight chip selects from three digital output. use CS0 as /EN, use three gpio's for the channel select inputs. I am trying to control 3 SPI slaves from one SPI co...
by mikronauts
Tue Aug 20, 2019 2:35 pm
Forum: Documentation
Topic: ESP32 ISA reference manual
Replies: 13
Views: 3411

Re: ESP32 ISA reference manual

Very unfortunate. I was thinking of writing an assembly language virtual machine for my compiler... on other 32 bit risc processors an optimized assembly vm ran 4x+ faster than a C version, in anout 1/10 the space. I don't think we have any update to what is shown here: https://www.esp32.com/viewtop...
by mikronauts
Sun Jul 28, 2019 12:41 pm
Forum: Hardware
Topic: 100K spi transactions per second
Replies: 3
Views: 538

Re: 100K spi transactions per second

15us intervals do seem excessive. Perhaps there is a configurable parameter in the spi master library or the rtos for minimum cs enable/disable periods? If not, maybe you could use the ulp to handle the spi transactions? Or use interrupts for spi receive and handle them on the other core? Worst case...
by mikronauts
Sun Jul 28, 2019 1:46 am
Forum: ESP32 Arduino
Topic: ESP32-Cam and SD Card
Replies: 11
Views: 4664

Re: ESP32-Cam and SD Card

Any luck with gpio16?

I just got my modules a few days ago.
by mikronauts
Sat Jul 27, 2019 3:16 pm
Forum: Hardware
Topic: 100K spi transactions per second
Replies: 3
Views: 538

Re: 100K spi transactions per second

That code sets the spi clock to 1.5Mhz, whereas the mcp3002 spec allows for 3.2mhz at 5vdc. Run the adc at 5v, use a voltage divider on miso, and increase the spi clock. Hi. I want to sample from an MCP3002 SPI ADC 100K times per second. I'm currently using the following code and only archiving abou...
by mikronauts
Thu Jul 25, 2019 2:56 pm
Forum: Hardware
Topic: very very slow pwm singal generation
Replies: 4
Views: 657

Re: very very slow pwm singal generation

Just use a timer interrupt Hi WiFive, This was the other option I was thinking of doing. I was hoping that maybe the ledc module could do this. I'd say if the timer has a period of 20 mins with a 10% duty, then a variation of 5% or less would be preferred. I'm not too familiar with the esp32's timer...

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