Search found 15 matches

by mbalci
Sat Oct 13, 2018 4:08 pm
Forum: General Discussion
Topic: ADC speed?
Replies: 25
Views: 22170

Re: ADC speed?

No: - The sample depth is the I2S sample depth you specify when initializing the driver, most likely you use 16bit/sample. - You need to divide, so 6000 samples/s and 16 bit means 6000/16=375. here is a small test code , i think i2s driver is not reliable. Whit this code i can read 5.977 (less than...
by mbalci
Sat Oct 13, 2018 11:20 am
Forum: ESP32 Arduino
Topic: 0dB attenuaton (ADC_ATTEN_DB_0)
Replies: 3
Views: 1708

Re: 0dB attenuaton (ADC_ATTEN_DB_0)

Attenuation refers to the amount an voltage signal is scaled down before being input into the ADC. The ADC's can ideally only measure voltages between 0 to 1100mV. Therefore to measure voltages larger than 1100mV, an input voltage can be scaled down such that it is within the 0 to 1100mV range henc...
by mbalci
Thu Oct 04, 2018 11:06 am
Forum: General Discussion
Topic: ADC speed?
Replies: 25
Views: 22170

Re: ADC speed?

ESP_Sprite wrote:From my notes, the sample rate you have to set for ADC acquisition on the current esp-idf is (actual_sample_rate)/(bits_per_sample).
So you mean to read 6ksps from adc 12bit per sample, should i set i2c sampling frequency to the 12x6 = 72khz ?
by mbalci
Wed Oct 03, 2018 2:58 pm
Forum: General Discussion
Topic: What would you like to see in The Next Chip?
Replies: 332
Views: 105546

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

i think first off all you need better documentation as like stm32 , Documents are really hard to understand even you dont have some basic specs like adc max sampling rate etc etc... My dream features ; - Good and reliable documentation,datasheet,reference etc.. - Boot from sdcard by hardware. - Adc ...
by mbalci
Wed Oct 03, 2018 2:46 pm
Forum: General Discussion
Topic: ADC speed?
Replies: 25
Views: 22170

Re: ADC speed?

How to set adc sampling rate when we get data via I2S ? As we can see I2S uses WS signal to sample adc , so what is the relation with
i2s_config.sample_rate = 120KHz; and ws signal ? is I2S sampling rate frequency of WS signal or frequency of i2s clock signal ?
by mbalci
Tue Oct 02, 2018 2:57 pm
Forum: ESP32 Arduino
Topic: 0dB attenuaton (ADC_ATTEN_DB_0)
Replies: 3
Views: 1708

0dB attenuaton (ADC_ATTEN_DB_0)

Hello, In adc.h file there is such notes ; The default ADC full-scale voltage is 1.1V. To read higher voltages (up to the pin maximum voltage, * usually 3.3V) requires setting >0dB signal attenuation for that ADC channel. * * When VDD_A is 3.3V: * * - 0dB attenuaton (ADC_ATTEN_DB_0) gives full-scale...
by mbalci
Tue Oct 02, 2018 2:47 pm
Forum: ESP32 Arduino
Topic: ??? I2S data from GPIO matrix signal ???
Replies: 0
Views: 502

??? I2S data from GPIO matrix signal ???

Hello ,
enum adc_i2s_source_t

Code: Select all

    Values:

    ADC_I2S_DATA_SRC_IO_SIG = 0

        I2S data from GPIO matrix signal
What is the meaning of I2S data from GPIO matrix signal ? in adc.h file ?
What is it for ? Which register's which bit is it?
by mbalci
Sat Sep 29, 2018 4:31 pm
Forum: Report Bugs
Topic: Unexpectedly low floating-point performance in C
Replies: 20
Views: 20733

Re: Unexpectedly low floating-point performance in C

So what is the result ? Did you tried suggestion ?
by mbalci
Sun Sep 02, 2018 8:40 am
Forum: ESP32 Arduino
Topic: when is going to be implemented for I2S ADC DMA ?
Replies: 4
Views: 1384

Re: when is going to be implemented for I2S ADC DMA ?

ESP_igrr wrote:To install Arduino for ESP32, follow these instructions: https://github.com/espressif/arduino-es ... manager.md
But this version does not allow to use i2s for adc ,doesnt it?
by mbalci
Thu Aug 30, 2018 4:41 pm
Forum: ESP32 Arduino
Topic: when is going to be implemented for I2S ADC DMA ?
Replies: 4
Views: 1384

Re: when is going to be implemented for I2S ADC DMA ?

i just donwloaded arduino 1.8.5 then esp32 from some where .
So where can i get this IDF for arduino ? Is this correct link ?

Code: Select all

https://github.com/platformio/platform-espressif32/releases
And how install this file in to the arduino because platform-espressif32-1.3.0.zip file includes py files.

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