Hi, I would like to connect several interfaces directly to the ESP32-Pico-D4 chip (I2C, UART, I2S, SPI). The documentation in one place indicates that the chip lead can be connected to any peripheral: . and in another it shows what peripherals are available at a given pinout: . Could someone...

. This is almost the case It is important to note that some of these have limited use e.g. they can only operate in INPUT mode. . It is always better to check for a specific interface how it should be configured. For an example of I2C: . This is about the default pins for a given interface.

To complement my colleague's statement, I throw up a link: Section 4.2 clearly defines which peripheral can be connected to which pin of the circuit.

. The problem is that the terms Any GPIO Pins used there are a kind of mental shortcut and are not true for e.g. UART, SPI or I2C. Better verify this with the information I provided in the previous post though. In the document referred to by a colleague in the last post, it is worth reading the appendix A.1. Notes on ESP32 Pin Lists.

Thank you for your help. Let me pull the topic further to understand the manufacturer's documentation. Assuming I want to configure the UART interface, I check the Manual attached by a colleague. . It is stated that I can designate any GPIO pins to the interface, provided (according to the documentation) that I do not attach the TX (output) line to Input Only. If I stay with the default settings, the interface will be attached to the default leads according to the table in appendix A.4 IO_MUX.

. If the Input Only pin is specified as TX, the uart_set_pin() function will return the value ESP_FAIL. . Yes, for the given UART interface and according to the defaults in the uart_channel.h file:

Gentlemen the link given above - LINE OF THE MONTH for me. Google-translator-pages and sensational to read. Super descriptions for anyone starting with ESP32/ESP8266!!!

ESP32-PICO-D4 - how to assign I2C, UART, I2S, SPI to pins?

padre_joseph 1179 6

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#1 18468508 13 Feb 2020 12:44

padre_joseph padre_joseph

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Post #1
18468508 13 Feb 2020 12:44

Hi,
I would like to connect several interfaces directly to the ESP32-Pico-D4 chip (I2C, UART, I2S, SPI). The documentation in one place indicates that the chip lead can be connected to any peripheral:
.
and in another it shows what peripherals are available at a given pinout:
.
Could someone more experienced share their experience and tell me how it is with this in the end? Can I connect any interface to any lead?
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#2 18468552 13 Feb 2020 13:10

khoam khoam

Level 42

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Post #2
18468552 13 Feb 2020 13:10

padre_joseph wrote:
Documentation in one place indicates that the chip lead can be connected to any peripheral
.
This is almost the case It is important to note that some of these have limited use e.g. they can only operate in INPUT mode.
https://randomnerdtutorials.com/esp32-pinout-reference-gpios/

padre_joseph wrote:
Can I connect any interface to any lead-in?
.
It is always better to check for a specific interface how it should be configured. For an example of I2C:
https://docs.espressif.com/projects/esp-idf/e...peripherals/i2c.html#i2c-api-configure-driver

padre_joseph wrote:
and in another it shows what peripherals are available under a given pinout:
.
This is about the default pins for a given interface.
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#3 18480099 19 Feb 2020 09:45

padre_joseph padre_joseph

Level 9

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Post #3
18480099 19 Feb 2020 09:45

To complement my colleague's statement, I throw up a link: https://www.espressif.com/sites/default/files/documentation/esp32_datasheet_en.pdf
Section 4.2 clearly defines which peripheral can be connected to which pin of the circuit.
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#4 18480853 19 Feb 2020 16:42

khoam khoam

Level 42

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Post #4
18480853 19 Feb 2020 16:42

padre_joseph wrote:
Section 4.2 clearly defines which peripheral can be connected to which chip pin.
.
The problem is that the terms "Any GPIO Pins" used there are a kind of mental shortcut and are not true for e.g. UART, SPI or I2C. Better verify this with the information I provided in the previous post though.

In the document referred to by a colleague in the last post, it is worth reading the appendix "A.1. Notes on ESP32 Pin Lists".
#5 18482230 20 Feb 2020 11:21

padre_joseph padre_joseph

Level 9

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Post #5
18482230 20 Feb 2020 11:21

Thank you for your help. Let me pull the topic further to understand the manufacturer's documentation.
Assuming I want to configure the UART interface, I check the Manual attached by a colleague.

.

It is stated that I can designate any GPIO pins to the interface, provided (according to the documentation) that I do not attach the TX (output) line to "Input Only". If I stay with the default settings, the interface will be attached to the default leads according to the table in appendix A.4 IO_MUX.
#6 18482268 20 Feb 2020 11:44

khoam khoam

Level 42

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Post #6
18482268 20 Feb 2020 11:44

padre_joseph wrote:
It is stated that I can indicate any GPIO pins to the interface, provided (according to the documentation) that I do not include the TX (output) line as "Input Only".
.
If the "Input Only" pin is specified as TX, the uart_set_pin() function will return the value ESP_FAIL.

padre_joseph wrote:
If I stay with the default settings, the interface will be attached to the default pins as shown in the table in Appendix A.4. IO_MUX.
.
Yes, for the given UART interface and according to the defaults in the uart_channel.h file:
https://github.com/espressif/esp-idf/blob/rel...mponents/soc/esp32/include/soc/uart_channel.h
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#7 18496649 27 Feb 2020 10:58

JanuszKornas JanuszKornas

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Post #7
18496649 27 Feb 2020 10:58

khoam wrote:
Right this is It is important to note that some of these have limited use e.g. they can only operate in INPUT mode.
https://randomnerdtutorials.com/esp32-pinout-reference-gpios/

Gentlemen the link given above - LINE OF THE MONTH for me. Google-translator-pages and sensational to read. Super descriptions for anyone starting with ESP32/ESP8266!!!
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Topic summary

The discussion revolves around the configuration of I2C, UART, I2S, and SPI interfaces on the ESP32-PICO-D4 chip. Users clarify that while the chip allows for flexible pin assignments, certain limitations exist, particularly with "Input Only" pins that cannot be used for output functions like TX in UART. Documentation from Espressif provides detailed guidance on which GPIO pins can be assigned to specific peripherals, emphasizing the importance of adhering to default settings unless explicitly configured otherwise. Users share links to relevant resources, including the ESP32 datasheet and API documentation, to aid in understanding the pin configuration process.
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ESP32-PICO-D4 - how to assign I2C, UART, I2S, SPI to pins?

ESP32-PICO-D4 - how to assign I2C, UART, I2S, SPI to pins?

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