Search found 13 matches

by PaulShaw
Sat Jul 10, 2021 10:25 am
Forum: Hardware
Topic: Can the ESP32 interupt and read port within 1us?
Replies: 6
Views: 6306

Re: Can the ESP32 interupt and read port within 1us?

I think you can use PULSE_CNT to try
by PaulShaw
Fri Oct 23, 2020 3:10 pm
Forum: General Discussion
Topic: ESP32-S2 G-SPI SCLK Frequency
Replies: 1
Views: 2759

ESP32-S2 G-SPI SCLK Frequency

https://docs.espressif.com/projects/esp ... slave.html

In this link,SPI Slave SCLK Frequency limited 11.4MHz or 7.2MHz.

But it's 40MHz in the datasheet.

Which one is right?
by PaulShaw
Mon Jan 20, 2020 11:42 am
Forum: General Discussion
Topic: ESP32 I2S camera slave mode I2Snl_Data_in Can be set to 1-bit/2-bit/4-bit?
Replies: 2
Views: 3660

Re: ESP32 I2S camera slave mode I2Snl_Data_in Can be set to 1-bit/2-bit/4-bit?

Not exactly... if you need 1-bit, you may be able to fake something using the normal (non-camera) I2S mode. If you need 2 or 4-bit modes, perhaps the dual-SPI/QSPI modes of the SPI peripherals can do what you need. Thanks your reply! In SPI Slave mode,the SPI-clk frequency is not higher than CLKapb...
by PaulShaw
Sun Jan 19, 2020 3:11 am
Forum: General Discussion
Topic: ESP32 I2S camera slave mode I2Snl_Data_in Can be set to 1-bit/2-bit/4-bit?
Replies: 2
Views: 3660

ESP32 I2S camera slave mode I2Snl_Data_in Can be set to 1-bit/2-bit/4-bit?

ESP32 I2S camera slave mode I2Snl_Data_in Can be set to 1-bit/2-bit/4-bit?

From https://github.com/espressif/esp32-camera
I found camera interface I2Snl_Data_in is 8-bit data width.

Can I set to 1-bit/2-bit/4-bit? And How to store into DMA buffer ?
by PaulShaw
Wed Nov 07, 2018 10:17 am
Forum: Hardware
Topic: ESP32D0WD RTC 32.768KHz
Replies: 1
Views: 4348

ESP32D0WD RTC 32.768KHz

Hi,there
I use external 32.768KHz crystal as rtc clock.It's Cl is 9pf and Rl is 35Kohm.
Most of ESP32 take 2-3s to work,but some ESP32 32.768Khz don't work.

What's crystal parameters?

Thanks in advance for your help!
by PaulShaw
Wed Nov 07, 2018 9:58 am
Forum: Hardware
Topic: ESP32D0WD deep sleep current
Replies: 0
Views: 2576

ESP32D0WD deep sleep current

hi,there I set ESP32 into deep sleep,it's current is 10uA. But it slowly increases to 50uA or more.It takes several senconds or minutes. After I replaced ESP32,it's deep current is kept at 10uA. When I replaced the old one,the current increased slowly. What‘s the reason? Thanks in advance for your h...
by PaulShaw
Fri Aug 24, 2018 7:28 am
Forum: Hardware
Topic: Pad Hold ---- REG_DG_PAD_FORCE_UNHOLD
Replies: 3
Views: 5638

Re: Pad Hold ---- REG_DG_PAD_FORCE_UNHOLD

Solved it!
It's in RTCIO_DIG_PAD_HOLD_REG,but it's only set to hold 0.
by PaulShaw
Wed Aug 22, 2018 4:55 am
Forum: Hardware
Topic: Pad Hold ---- REG_DG_PAD_FORCE_UNHOLD
Replies: 3
Views: 5638

Re: Pad Hold ---- REG_DG_PAD_FORCE_UNHOLD

I set it to 0,GPIO21 hold it's level,and RTC GPIOs were also holded.
So I can't wakeup ESP32 from deep-sleep.
by PaulShaw
Wed Aug 22, 2018 3:51 am
Forum: Hardware
Topic: Pad Hold ---- REG_DG_PAD_FORCE_UNHOLD
Replies: 3
Views: 5638

Pad Hold ---- REG_DG_PAD_FORCE_UNHOLD

hi.
I want set GPIO21 to low in deep sleep,it's not a RTC-GPIO.
So I want to use Pad Hold,but I don't find REG_DG_PAD_FORCE_UNHOLD in "esp32_technical_reference_manual_cn V3.4".
Where is it?How to use it?

Thanks in advance for your help!
by PaulShaw
Fri May 11, 2018 2:05 am
Forum: ESP-IDF
Topic: ESP32-D2WD set GPIO17-U2TXD output 1
Replies: 3
Views: 5876

Re: ESP32-D2WD set GPIO17-U2TXD output 1

ESP_Sprite wrote:Datasheet of the ESP32, page 9: "ESP32-D2WD’s pins GPIO16, GPIO17, SD_CMD, SD_CLK, SD_DATA_0 and SD_DATA_1 are used for connecting the embedded flash, and are not recommended for other uses."
I think the flash use "SD_CMD, SD_CLK, SD_DATA_0 and SD_DATA_1",why it used GPIO16 and GPIO17?