ESP32 Forum

hello,

I would like to use the fastest SPI interface possible, so I am using these pins to take advantage of the IO_MUX

[Codebox]#define PIN_NUM_MISO 12
#define PIN_NUM_MOSI 13
#define PIN_NUM_CLK 14
#define PIN_NUM_CS 15[/Codebox]

But am I really forced to use the CS pin or can I use everything? In other architecture I am free to use any pin for the CS

If you are working with Arduino I cannot say, but if ESP-IDF you can.

I think you are correct, i read again the docs (https://docs.espressif.com/projects/esp ... aster.html) and:

Only the first Device attached to the bus can use the CS0 pin

So looks like that other CS pin can be used without affecting the speed

If you want to disable all CS pins you would set sclk_io_num to -1
Take a look here: https://espressif-docs.readthedocs-host ... lk_io_numE

Then you can control your own CS using something like this.
#define CS GPIO_NUM_16

gpio_set_level(CS, 0);
send you data
gpio_set_level(CS, 1);