Search found 519 matches

by ESP_igrr
Tue May 23, 2017 2:50 am
Forum: General Discussion
Topic: question about the oscillators
Replies: 5
Views: 56

Re: question about the oscillators

8MHz is used by default as RTC_FAST_CLK.
by ESP_igrr
Tue May 23, 2017 2:49 am
Forum: General Discussion
Topic: Clarification re. GPIO matrix and IO Mux
Replies: 2
Views: 35

Re: Clarification re. GPIO matrix and IO Mux

For example, JTAG, SD HOST, SDIO SLAVE, EMAC can not be remapped to other pins using the GPIO matrix (except for a few signals in SD HOST and EMAC). SPI, I2S and all the low speed peripherals can be remapped. As WiFive said, check the list of GPIO matrix signals.
by ESP_igrr
Mon May 22, 2017 12:28 pm
Forum: ESP32 SDK
Topic: SD card interface speed issues
Replies: 1
Views: 29

Re: SD card interface speed issues

Here are the few benchmarks we did when writing the SDMMC driver. First are the raw reads and writes — these test the SDMMC peripheral itself by reading/writing certain number of sectors (the number of sectors is given in the "count" column). The tests were run with a no-name SDHC card, wh...
by ESP_igrr
Mon May 22, 2017 9:49 am
Forum: ESP32 HDK
Topic: Does the ESP-32S thermal/ground pad need paste/soldering?
Replies: 11
Views: 332

Re: Does the ESP-32S thermal/ground pad need paste/soldering?

temprature_sens_read (sic.) returns ADC counts. To convert these into degrees C you would need to perform some kind of calibration by measuring the temperature with an external tool.
by ESP_igrr
Mon May 22, 2017 9:36 am
Forum: ESP32 SDK
Topic: Why does get_rtc_time_us() truncate the result to uint32_t?
Replies: 20
Views: 244

Re: Why does get_rtc_time_us() truncate the result to uint32_t?

Also s_microseconds rolls over at 32-bit. Can't reproduce this here, can you hint at how you got these results? Attached are graphs of RTC/FRC timers offset w.r.t. the timer on a PC. RTC time was obtained from system_get_rtc_time , FRC time — from get_time_since_boot timelog_rtc_frc.png timelog_frc...
by ESP_igrr
Mon May 22, 2017 9:31 am
Forum: General Discussion
Topic: SDIO Interface
Replies: 25
Views: 1987

Re: SDIO Interface

In case you are doing this on the breadboard, re-check your connections. The error being reported is 0x109 or ESP_ERR_INVALID_CRC (see esp_err.h), which usually indicates that there is a signal integrity issue. The driver will use 20MHz clock for most of the cards. If you find that this doesn't work...
by ESP_igrr
Mon May 22, 2017 9:17 am
Forum: ESP32 HDK
Topic: Does the 24M or 26M crystal are suit ESP32?
Replies: 13
Views: 159

Re: Does the 24M or 26M crystal are suit ESP32?

Seems like you don't have the partition table uploaded. Have you tried running 'make flash' to upload bootloader, partition table, and the application?
by ESP_igrr
Mon May 22, 2017 9:15 am
Forum: General Discussion
Topic: question about the oscillators
Replies: 5
Views: 56

Re: question about the oscillators

Internal 8 MHz oscillator with calibration Internal RC oscillator with calibration External 32 kHz crystal oscillator for RTC with calibration External 2 MHz to 40 MHz crystal oscillator All of these are indeed supported by the ESP32. Note that while the chip can run from any crystal from 2MHz to 4...
by ESP_igrr
Mon May 22, 2017 7:33 am
Forum: General Discussion
Topic: Clarification on SD_CARD Pins
Replies: 3
Views: 161

Re: Clarification on SD_CARD Pins

do you plan SD CARD SPI Version ?


Yes, the SD SPI driver is almost ready! Hope to release it soon.
by ESP_igrr
Mon May 22, 2017 7:12 am
Forum: ESP32 SDK
Topic: Why does get_rtc_time_us() truncate the result to uint32_t?
Replies: 20
Views: 244

Re: Why does get_rtc_time_us() truncate the result to uint32_t?

I'm not getting the 1sec/min difference here, but will try a bunch of other boards, might be chip dependent?
timelog.png
timelog.png (57.61 KiB) Viewed 24 times

Go to advanced search