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by markwj
Fri May 26, 2017 12:55 pm
Forum: ESP32 IDF
Topic: 3 device limit on SPI
Replies: 2
Views: 2183

3 device limit on SPI

The documentation talks about a 3 device limit on each SPI bus. I also see in spi_master.c: #define NO_CS 3 //Number of CS pins per SPI host typedef struct { spi_device_t *device[NO_CS]; intr_handle_t intr; spi_dev_t *hw; spi_transaction_t *cur_trans; int cur_cs; lldesc_t dmadesc_tx, dmadesc_rx; boo...
by markwj
Fri Apr 28, 2017 6:09 am
Forum: Hardware
Topic: ESP-WROOM-32 Flash Size
Replies: 15
Views: 21285

Re: ESP-WROOM-32 Flash Size

This approach seems to work (external flash chip on different chip select GPIO).

Are there any 128Mbit flash chips that have been tested workable already with ESP-32?

It seems Winbond W25Q128FV was used with ESP8266 with success, but not recommended for new designs. So W25R128FV, but no stock?
by markwj
Wed Apr 26, 2017 1:23 am
Forum: Hardware
Topic: ESP-WROOM-32 Flash Size
Replies: 15
Views: 21285

Re: ESP-WROOM-32 Flash Size

I'll reply regarding this point, and will ask colleagues to reply about custom module availability ( yes, you can order modules with larger flash size ) I've tried adding an external flash, but that doesn't seem to work - it conflicts with the GD25Q32 which can't seem to be disabled. Putting the ex...
by markwj
Wed Apr 26, 2017 1:14 am
Forum: Hardware
Topic: ESP-WROOM-32 Flash Size
Replies: 15
Views: 21285

Re: ESP-WROOM-32 Flash Size

Hi, our dear customer, Firstly, could you please give us your email address which you send your questions to our "sales@espressif.com". And actually, we still have to ask you to make customized module order via that window. And we hope we can contact you via that window as many business colleagues ...
by markwj
Tue Apr 25, 2017 6:42 am
Forum: Hardware
Topic: ESP-WROOM-32 Flash Size
Replies: 15
Views: 21285

ESP-WROOM-32 Flash Size

The standard ESP-WROOM-32 module has GD25Q32 SPI flash, which is 32Mbits. That is 4MB, but using OTA feature (one factory image, one running OTA image, and one download OTA image), the maximum program size comes down to only about 1MB and that is not sufficient for our application. I've tried adding...
by markwj
Thu Oct 06, 2016 6:07 am
Forum: Hardware
Topic: WROOM-32
Replies: 6
Views: 3455

WROOM-32

It seems that the current WROOM-32 is using a 4MB flash, and 'open top' design.

Are there plans to release a version of WROOM-32 with 16MB flash?

Are there plans to certify WROOM-32 for modular use?

If so, any idea of timeline?
by markwj
Sat Sep 03, 2016 9:56 am
Forum: Hardware
Topic: Is there CAN interface in ESP32?
Replies: 11
Views: 10459

Re: Is there CAN interface in ESP32?

Now this has been released, can we have some details on the CAN? Which pins are used to connect to the external transciever? Presumably just CANTX and CANRX? Any documentation on the software for this (or pointers to CPU documentation)?

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