Search found 41 matches

by pataga
Sat Jun 06, 2020 11:13 am
Forum: General Discussion
Topic: What would you like to see in The Next Chip?
Replies: 379
Views: 170839

Re: What would you like to see in The Next Chip?

Big thumbs up for : 1. RISC V cores - simply because you will have more software engineers willing to invest the effort if the knowledge is transferable, and so, a bigger pool of software engineers who can contribute to developing drivers, toolchain improvements, applications. 2. DMA to/from PSRAM t...
by pataga
Sat Dec 28, 2019 3:47 am
Forum: General Discussion
Topic: What would you like to see in The Next Chip?
Replies: 379
Views: 170839

Re: What would you like to see in The Next Chip?

I think also more details into the functioning of the peripherals would be a good investment as it should carry forward to new processor designs, e.g. an ADC that delivers accurate results. Absolutely ! Unfortunately not paying enough attention to the peripherals and peripheral control, i.e. gettin...
by pataga
Fri Nov 15, 2019 7:25 am
Forum: ESP-IDF
Topic: I2S microphone (RX)
Replies: 55
Views: 49239

Re: I2S microphone (RX)

Hi, Just in case you guys didn't see this already https://hackaday.io/project/162059-street-sense/log/160705-new-i2s-microphone It seems the SPH0645 timing is incompatible with the ESP32 i2s peripheral. The data transitions on the rising edge of BCK, just when the ESP32 is sampling the data. They en...
by pataga
Mon Sep 16, 2019 3:05 pm
Forum: Hardware
Topic: Recommend some H Bridge chip with low voltage drop please
Replies: 3
Views: 1210

Re: Recommend some H Bridge chip with low voltage drop please

If bjt voltage drop is the problem, why not use a mosfet h bridge (with p and n low threshold mosfets , e.g. BSS84 and BSS138 ) ? See https://circuitdigest.com/electronic-ci ... ing-mosfet for the schematic.
by pataga
Wed Aug 28, 2019 6:04 am
Forum: General Discussion
Topic: What would you like to see in The Next Chip?
Replies: 379
Views: 170839

Re: What would you like to see in The Next Chip?

I hope you're giving some attention to the micro-controller and hard real-time aspect as well. For me a really drool-worthy module would have the architecture features of the Teensy 4 along with communications hardware. Scalable instruction clock with fine resolution, independent of peripheral clock...
by pataga
Fri Jul 19, 2019 3:17 am
Forum: Hardware
Topic: Brownout prevention circuit
Replies: 11
Views: 4301

Re: Brownout prevention circuit

I had restart problems when using a large capacitor e.g. 330uF on the 3V3 line. Power supply was 4.2V lipoly battery + 3V3 LDO regulator - would not reboot if I switched off and switched on again within a few seconds. Suspected the large capacitor was discharging slowly and maintaining enough residu...
by pataga
Tue Jul 16, 2019 3:54 am
Forum: Hardware
Topic: Power consumption - especially if not everything is working smooth
Replies: 7
Views: 2398

Re: Power consumption - especially if not everything is working smooth

I've used a TPS3839 voltage supervisor on a WROVER breakout board. My main concern is when I have a large capacitor on the 3.3V supply line. Switching off the power supply to the voltage regulator results in a flaky restart when the regulator output capacitors do not discharge fully on shutdown - no...
by pataga
Sun Jul 07, 2019 10:33 am
Forum: Report Bugs
Topic: spi peripheral doesn't work if MISO pin set to -1
Replies: 2
Views: 1122

spi peripheral doesn't work if MISO pin set to -1

Hi, I'm using the hspi peripheral to write to an LCD - so I only need the SCK and MOSI pins on the spi peripheral (am using software SS). I'm using the esp32-hal api : when I set the MISO pin set to -1, there is no compilation error, and no run-time error, but the spi transfers do not work. If I set...
by pataga
Fri Feb 09, 2018 5:09 am
Forum: General Discussion
Topic: need to understand source of crash : "Cache disabled but cached memory region accessed"
Replies: 2
Views: 2306

need to understand source of crash : "Cache disabled but cached memory region accessed"

Hi, I seem to have introduced a problem in my code recently and can't figure out why. As per the trace, the panic is from the external gpio interrupt handler, but I have no idea how to resolve it ... so if anyone can explain what i'm doing wrong here, would appreciate it ! --- idf_monitor on /dev/tt...

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