Search found 87 matches

by markwj
Wed Jan 31, 2018 2:52 am
Forum: Showcase
Topic: ESP32 with GSM modem - PPP over Serial (PPPoS) client example
Replies: 32
Views: 41527

Re: ESP32 with GSM modem - PPP over Serial (PPPoS) client example

I'm using your code as a base for my application. My project contains a ESP32 together with GPS and a SIM800L board. The target is to do GPS tracking through Wi-Fi and 3G. Is there some library that does the connection management, switching between GPRS and Wi-Fi (when the configured network is ava...
by markwj
Tue Jan 30, 2018 3:29 am
Forum: Hardware
Topic: ESP WROVER Flash Size
Replies: 6
Views: 2139

Re: ESP WROVER Flash Size

Note: Raised the hard-coded GPIOs issue as a bug:

https://github.com/espressif/esp-idf/issues/1563
by markwj
Tue Jan 30, 2018 2:06 am
Forum: Hardware
Topic: ESP WROVER Flash Size
Replies: 6
Views: 2139

Re: ESP WROVER Flash Size

By fixing FLASH_CS_IO in components/esp32/spiram_psram.c, I get further: I (685) boot: Loaded app from partition at offset 0x10000 I (686) boot: Disabling RNG early entropy source... Guru Meditation Error: Core 0 panic'ed (LoadProhibited) . Exception was unhandled. Register dump: PC : 0x400da37f PS ...
by markwj
Tue Jan 30, 2018 1:08 am
Forum: Hardware
Topic: ESP WROVER Flash Size
Replies: 6
Views: 2139

Re: ESP WROVER Flash Size

A review of the code brings up these gems: /components/esp32/spiram_psram.c // IO-pins for PSRAM. These need to be in the VDD_SIO power domain because all chips we // currently support are 1.8V parts. // WARNING: PSRAM shares all but the CS and CLK pins with the flash, so these defines // hardcode t...
by markwj
Mon Jan 29, 2018 8:46 am
Forum: Hardware
Topic: Need help to connect external 16 MB SPI Flash Memory on ESP32-WROVER Kit
Replies: 34
Views: 19775

Re: Need help to connect external 16 MB SPI Flash Memory on ESP32-WROVER Kit

I am a software engineer but as we discussed with our hardware engineer regarding this issue and they had used 1.8 V supported external flash. But as per discussion with them they had also used voltage regulator as well to operate it. So, Definitely, External Flash and PSRAM both will be working on...
by markwj
Mon Jan 29, 2018 8:17 am
Forum: Hardware
Topic: ESP WROVER Flash Size
Replies: 6
Views: 2139

Re: ESP WROVER Flash Size

Not related to the issue, but I just don't understand why ESP32-WROVER is not available in 8/16 MB Flash version. The price impact should be minimal. Kind of related; I too can't understand why they don't make the option available. Without VDD_SDIO exposed, and without any 1.8v domain GPIOs availab...
by markwj
Mon Jan 29, 2018 5:34 am
Forum: Hardware
Topic: ESP WROVER Flash Size
Replies: 6
Views: 2139

Re: ESP WROVER Flash Size

P.S. Reading the source code, it seems that PSRAM CLK is also delayed wrt SPI CLK, which could mess things up further: esp-idf/components/esp32/./spiram_psram.c esp_err_t IRAM_ATTR psram_enable(psram_cache_mode_t mode, psram_vaddr_mode_t vaddrmode) //psram init ... /* We need to delay CLK to the PSR...
by markwj
Mon Jan 29, 2018 5:28 am
Forum: Hardware
Topic: ESP WROVER Flash Size
Replies: 6
Views: 2139

ESP WROVER Flash Size

Similar to the topic for WROOM-32, but for WROVER. We can add an external 1.8v flash, external 1.8v regulator (as VDD_SDIO is not exposed), but the issue is the CS line for external flash. Given that GPIO16 and GPIO17 (the last two remaining GPIOs in VDD_SDIO domain) are used for PSRAM inside the mo...
by markwj
Sat Jan 20, 2018 6:05 am
Forum: General Discussion
Topic: What would you like to see in The Next Chip?
Replies: 343
Views: 114094

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

Short list of top 5: More GPIO (in both 3.3v and VDD_SDIO domains). More internal RAM, or a way to move more to external PSRAM. A chip with 520KB RAM, bluetooth, and wifi is great; but how much of that RAM is available once Wifi and Bluetooth plus a reasonable set of functions are enabled? 20%? Modu...
by markwj
Sat Jan 20, 2018 5:35 am
Forum: Hardware
Topic: Need help to connect external 16 MB SPI Flash Memory on ESP32-WROVER Kit
Replies: 34
Views: 19775

Re: Need help to connect external 16 MB SPI Flash Memory on ESP32-WROVER Kit

We had finalized to use 1.8 v supported external memory and also finalized to change default memory as external memory instead of internal memory. So, with that we can use external memory as well as 4 MB PSRAM for more memory allocation purpose. Let me know if need any help regarding this as e had ...

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