Search found 54 matches

by KanyeKanye
Sun Dec 23, 2018 6:29 pm
Forum: General Discussion
Topic: SPI DMA Read/Write example
Replies: 1
Views: 1637

SPI DMA Read/Write example

Hi, I just read SPI api-reference and looking for an example snippet of reading SPI data in DMA mode. There is spi_master but it doesnt use DMA (doesnt it?) and just send, do not read any data. Things that are important for me: - declaring memory for buffers (how, should I declare new buffer for eac...
by KanyeKanye
Sun Oct 21, 2018 2:36 pm
Forum: Hardware
Topic: PWM LED resistors on WROVERKIT
Replies: 0
Views: 968

PWM LED resistors on WROVERKIT

What value are R149, R150 and R151 resistors used on WROVERKIT (these are resistors in series with rgb led)?
There are some enormous values showed on a schematic
by KanyeKanye
Wed Aug 01, 2018 4:29 pm
Forum: General Discussion
Topic: 4-line SD CARD and SPI using some pins
Replies: 0
Views: 689

4-line SD CARD and SPI using some pins

Hi. I would use SD Card in 4-line mode, connecting it to: GPIO14 (MTMS), GPIO15 (MTDO), GPIO2, GPIO4, GPIO12 (MTDI), GPIO13 (MTCK). Am I able to split GPIO14 (CLK), GPIO15 (MOSI) and GPIO2 (MISO) with another SPI device (flash memory)? Current version of sd_card drive allow for it in terms of time g...
by KanyeKanye
Mon Jun 04, 2018 2:53 pm
Forum: General Discussion
Topic: Memory chip in WROOM module?
Replies: 0
Views: 687

Memory chip in WROOM module?

Where MTDI pin (that selects voltage for VDD_SDIO) should be connected for modern WROOM32 module?
What flash chip is now used?

I see that for WROVER module, there is used another CLK pin for SRAM. Why?
by KanyeKanye
Sun Jun 03, 2018 10:25 pm
Forum: General Discussion
Topic: Using flash pins (SD_xxx) for external memory
Replies: 0
Views: 670

Using flash pins (SD_xxx) for external memory

Am I able to use pins SD_CLK, SD_DATA_0, SD_DATA_1 of WROOM module, where flash memory is connected, for additional external memory eg. fram? How to control SD_CMD, that is used as chip select pin? What voltages are on these pins: normal, as any other pin, or 1.7V? Is it a good practice to connect m...
by KanyeKanye
Sat Oct 14, 2017 10:35 pm
Forum: General Discussion
Topic: ESP32 - LiPo 3.7V with diode forward voltage as power source?
Replies: 8
Views: 5045

Re: ESP32 - LiPo 3.7V with diode forward voltage as power source?

Simple diode is okey solution keeping in mind its price.
Ldo is better because it do stabilization but caps are needed, more pins for soldering, current mustn't be too low and price is bigger
by KanyeKanye
Fri Jul 14, 2017 2:01 pm
Forum: General Discussion
Topic: Doubled TDI pin on WROVER KIT schematic, why?
Replies: 2
Views: 1629

Doubled TDI pin on WROVER KIT schematic, why?

On ESP-WROVER-KIT_SCH, JTAG section, TDI pin is doubled: one connected to MTDI (IO12/SD_DATA2), one by transistor Q3 made to heel down on a start off. Is it designed to work like that? What if I wont apply Q3 transistor and TDI will be just connected to IO12. As far I understand, JTAG conflicts with...
by KanyeKanye
Thu Jul 13, 2017 10:06 pm
Forum: General Discussion
Topic: WROVER KIT PCB doc
Replies: 0
Views: 1204

WROVER KIT PCB doc

I'm looking for WROVER KIT's PCB documentation - gerber, pdf of traces
by KanyeKanye
Thu Mar 23, 2017 8:42 pm
Forum: General Discussion
Topic: I2C: protection against connection (lines) problems
Replies: 9
Views: 5416

Re: I2C: protection against connection (lines) problems

Exactly. Dynamic replugging is not a point, but any EM deviation on a line mustn't cause a core panic