Search found 40 matches

by PaulNi
Sun Aug 04, 2019 8:30 pm
Forum: General Discussion
Topic: 2 LEDC channels, 180 deg. apart
Replies: 3
Views: 789

Re: 2 LEDC channels, 180 deg. apart

Take a look at a nand gate. But I bet there will be another twist... LED average current and its observable brightness are not linear.

I think there is no alternative than to just use 2 PWM channels.
by PaulNi
Thu Aug 01, 2019 11:22 pm
Forum: General Discussion
Topic: ESP32 Manufacturing QC issues
Replies: 23
Views: 4351

Re: ESP32 Manufacturing QC issues

Great idea WiFive, sadly no clock issues with good or bad modules, generated a 10 and 100Khz pwm they are all rock solid and spot on frequency wise. My guess will be power, and if it isn't, the only possible source of variability other than from the chip itself will be from in-package components. I...
by PaulNi
Mon Jul 29, 2019 12:08 pm
Forum: General Discussion
Topic: Espressif, Who you are?
Replies: 7
Views: 3346

Re: Espressif, Who you are?

I always wanted to drop by when I was working in Shanghai in 2016. I worked just one metro station away. I think I saw Teo with some engineers once in Starbucks near Lenovo, but thought it would be just too creepy to appear unannounced. Now I work with a engineering company in Shenzhen. Going back a...
by PaulNi
Mon Jul 29, 2019 11:22 am
Forum: General Discussion
Topic: Question to people wanting CanBus in the next chip version
Replies: 13
Views: 2776

Re: Question to people wanting CanBus in the next chip version

I think the number 1 problem with all those busses is that that you are almost always have to reinvent the bicycle whenever you just want a few MCUs to communicate with each other as no existing solution the most typical use cases. i2c multimaster hacks - well, they are hacks, and you are bound by i...
by PaulNi
Sat Jul 27, 2019 8:27 pm
Forum: General Discussion
Topic: What would you like to see in The Next Chip?
Replies: 372
Views: 152389

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

Following on https://esp32.com/viewtopic.php?f=2&t=11593&start=10 I wish for compatibility with new ethernet PHYs t1 and t1s to be considered on the development stages. Technically, t1 and t1s phys are transparent to the MAC layer, but... there are few things here and there which are better to be te...
by PaulNi
Sat Jul 27, 2019 2:47 pm
Forum: General Discussion
Topic: Question to people wanting CanBus in the next chip version
Replies: 13
Views: 2776

Re: Question to people wanting CanBus in the next chip version

Workings of existing T1 PHYs are POOORLY documented, but since a lot of automotive vendors have to submit to Linux upstream whether they want it or not, there is plenty of code for reverse engineering. For example I found a quite good register description of tja1101 in a linux patch here https://pat...
by PaulNi
Sat Jul 27, 2019 1:46 pm
Forum: General Discussion
Topic: Question to people wanting CanBus in the next chip version
Replies: 13
Views: 2776

Re: Question to people wanting CanBus in the next chip version

Are there any cheap broadrreach/100base-t1 phys? No, and that the reason for me delaying committing to it. In quantities financially feasible for out clients, the cheapest PHYs in stock we can buy in China is around $5 after duties and taxes (which is more expensive than the distributor price for E...
by PaulNi
Fri Jul 26, 2019 4:20 pm
Forum: General Discussion
Topic: [NEWS] Espressif initial public offerings of stock IPO 688018
Replies: 11
Views: 5311

Re: [NEWS] Espressif initial public offerings of stock IPO 688018

Any message/speech transcript from Zhang on that?
by PaulNi
Fri Jul 26, 2019 3:57 pm
Forum: General Discussion
Topic: Question to people wanting CanBus in the next chip version
Replies: 13
Views: 2776

Re: Question to people wanting CanBus in the next chip version

Ethernet is not multi drop and costs more to implement. Vehicles still use a combination of can, Lin, broadrreach, Ethernet, MOST ring. There are advantages to a lower speed multi drop bus like rs485 plus Ethernet where needed. Wireless is potentially cheaper if you can make it work with the device...
by PaulNi
Thu Jul 25, 2019 7:56 am
Forum: General Discussion
Topic: Question to people wanting CanBus in the next chip version
Replies: 13
Views: 2776

Re: Question to people wanting CanBus in the next chip version

Not sure I have any suggestions, but: How many drops needed on a single bus, and what's the maximum cable length needed for a single bus? I think less than 30-40 devices per bus in an apartment. There will be 1 isolated bus for each apartment, and 1 for BMS (building management system.) The maximum...