Search found 1912 matches

by WiFive
Sat Sep 22, 2018 9:11 pm
Forum: ESP32 IDF
Topic: ESP32 32Khz external crystal
Replies: 1
Views: 103

Re: ESP32 32Khz external crystal

No it is not required but it can improve accuracy of timekeeping
by WiFive
Sat Sep 22, 2018 9:09 pm
Forum: Hardware
Topic: How to undo gpio_matrix_out?
Replies: 1
Views: 86

Re: How to undo gpio_matrix_out?

cspwcspw wrote:No underlying silicon, or what gives?

2) What is the correct way to disconnect / undo my GPIOs 14 and 22, if I want to return them to "normal use".


Probably

Just select a different signal or different mux function
by WiFive
Sat Sep 22, 2018 6:01 pm
Forum: General Discussion
Topic: ESP-IDF & ESP-ADF
Replies: 1
Views: 95

Re: ESP-IDF & ESP-ADF

Adf uses a lot of binary codecs and libs that someone not using audio features has no interest in and are also compiled to a specific commit of idf. There are already too many components in idf that may not be used at all in a project.
by WiFive
Sat Sep 15, 2018 10:15 pm
Forum: General Discussion
Topic: IRAM_ATTR and IRQ handlers
Replies: 5
Views: 153

Re: IRAM_ATTR and IRQ handlers

If it is a variable it will be placed in dram but if it is a constant:

https://dl.espressif.com/doc/esp-idf/la ... m-data-ram
by WiFive
Sat Sep 15, 2018 4:12 am
Forum: General Discussion
Topic: IRAM_ATTR and IRQ handlers
Replies: 5
Views: 153

Re: IRAM_ATTR and IRQ handlers

IRAM_ATTR places the code into internal (nonpaged physical) IRAM as opposed to where code is placed by default which is into flash and then executed "in place" from the (paged virtual) cache which is controlled by the MMU.
by WiFive
Sat Sep 15, 2018 1:22 am
Forum: General Discussion
Topic: IRAM_ATTR and IRQ handlers
Replies: 5
Views: 153

Re: IRAM_ATTR and IRQ handlers

Either the interrupt is iram/dram safe meaning it can run when flash/spiram caches are disabled or it isn't. If it isn't then it can use cache memory but will be disabled when cache is unavailable. When you register the interrupt you tell the system what kind it is by specifying flags.
by WiFive
Sat Sep 15, 2018 1:18 am
Forum: General Discussion
Topic: "4 × virtual Wi-Fi interfaces"
Replies: 1
Views: 85

Re: "4 × virtual Wi-Fi interfaces"

Station, softap, espnow, espmesh?