Search found 20 matches
- Thu Nov 16, 2023 6:16 pm
- Forum: ESP32 Arduino
- Topic: Unwanted delay before and after SPI transaction
- Replies: 5
- Views: 6914
Re: Unwanted delay before and after SPI transaction
This worked for toggling the CS automatically SPI.begin(SPI_SCK, SPI_MISO, SPI_MOSI, SPI_SS); // SCK, MISO, MOSI, SS SPI.setHwCs(true); However, it didn't result in a speedup of the overall SPI process. I measured 3uS before the SPI transfer and 6uS after the SPI transfer worth of delay when the SPI...
- Thu Nov 16, 2023 4:44 am
- Forum: ESP32 Arduino
- Topic: Unwanted delay before and after SPI transaction
- Replies: 5
- Views: 6914
Re: Unwanted delay before and after SPI transaction
I’ll test it out and see if that speeds anything up. I found some docs that discussed a 1us delay acquiring a bus but I’m seeing a much larger delay.
- Thu Nov 16, 2023 3:30 am
- Forum: ESP32 Arduino
- Topic: Unwanted delay before and after SPI transaction
- Replies: 5
- Views: 6914
Re: Unwanted delay before and after SPI transaction
That’s what the example code did. Is there a faster way?
- Wed Nov 15, 2023 6:04 pm
- Forum: ESP32 Arduino
- Topic: Unwanted delay before and after SPI transaction
- Replies: 5
- Views: 6914
Unwanted delay before and after SPI transaction
https://previews.dropbox.com/p/thumb/ACHqZ7Fbn9pHOj3AmNwI3_XGYisd-u_ivTBdktcYmZhL-cviEUketfyo7R-2xnnpjcMFnt-Rq6m6aWcK539zdjBGE0Q4SbV_gsj9J6oiCRfczgKYPPHfJodeVG3mG7vEPfZdeu5oNV6hO5Tgj2vMUGngE6dEV_v00B5uX3PP-mJButK4BGYibBJHBWWXeUJKBF2Ix9MhPYuPQZ8rVzxyxf5NXrt5rpQwF9A91fDs7BUVZxWBGjU0RyCCJ8B0aVjsNTY_OV...
- Mon Nov 27, 2017 10:22 pm
- Forum: Hardware
- Topic: What matching components should be used for the 5x5 QFN package?
- Replies: 9
- Views: 15316
Re: What matching components should be used for the 5x5 QFN package?
Although the sparkfun schematic might have those components in it, they only populate a small cap on the PCB, which is strange. Also, the sparkfun uses the 6x6 package and we use the 5x5 which has a different rated output impedance. There are references for the components used to match the 6x6 but n...
- Thu Nov 02, 2017 5:01 pm
- Forum: Hardware
- Topic: What matching components should be used for the 5x5 QFN package?
- Replies: 9
- Views: 15316
What matching components should be used for the 5x5 QFN package?
According to the datasheet, the smaller 5x5 QFN (ESP32-D2WD) part the output impedance is 35+j10 which is different than the larger 6x6 package. What matching components would be recommended that part vs the old part (which has a different output impedance)? Also, I noticed that there are no matchin...
- Wed Sep 13, 2017 3:43 am
- Forum: ESP-IDF
- Topic: C version of esptool?
- Replies: 3
- Views: 6734
C version of esptool?
I will have an ESP32 and an STM32 on my PCB. I need to be able to perform OTA upgrades to both. Wondering if there is a C port of the esptool that will allow me to reflash the ESP32 from the STM32? The ESP32 that I'm using only has 16mbit of flash (internal) but the STM32 has 64mbit. Planning on hav...
- Thu Aug 24, 2017 2:59 am
- Forum: Hardware
- Topic: JTAG Daisy-Chaining
- Replies: 1
- Views: 4610
JTAG Daisy-Chaining
I'm planning on using the ESP32 along with an STM32. Is it possible to do JTAG daisy-chaining? And would both ICs need to be powered up for JTAG to work for either IC?
Thnx,
Reza
Thnx,
Reza
- Thu Aug 24, 2017 1:50 am
- Forum: Hardware
- Topic: Crystal Capacitance Tuning
- Replies: 1
- Views: 5837
Crystal Capacitance Tuning
I've been able to use a 26Mhz and 40Mhz xtal in testing, but for production if 40Mhz is more supported, that's what I would like to design in. I'm considering this XTAL: http://datasheet.octopart.com/FA-128-40.0000MF10Z-K3-Epson-datasheet-86700903.pdf For other designs, I typically double the capaci...
- Wed Aug 23, 2017 5:58 am
- Forum: ESP-IDF
- Topic: JTAG (OpenOCD) with WinBond Flash Works, Fails with Macronix Flash
- Replies: 3
- Views: 6590
Re: JTAG (OpenOCD) with WinBond Flash Works, Fails with Macronix Flash
I'm asking everyone - spent 3 days on this so far so I'm looking for all the help I can get. :) I just got a reply from visualGDB saying that they were previously using their own version of openOCD with their own flashing stubs in it. The latest beta version supports the esp32 version of openOCD and...