SPI register and demo

[costaud]

This is a demo of "how to use esp8266 (h)spi port"

Slave mode and master mode .

Raise your question here ,we will update this topic gradually.

SPI_CODE_141204.rar

(22.83 KiB) Downloaded 4661 times

[bjpirt]

@Costaud Many thanks for posting this. Will have a play with it and post back here with any questions

[kajtusize]

I've been struggling with SPI slave, almost same story as here viewtopic.php?f=7&t=1540&p=5113
The functions 0x04 and 0x05 are not working, actually I didn't succeed with any function! Any possible update/help!
Thanks!

[ldcung]

Do you have solved this question? I am having the same trouble now.Any help or suggestion with it would be appreciated!!

[scargill]

Am I missing something - this seems to be about a specific driver and I'm not seeing how the SPI master reads anything??

[xPhyiscs]

Hey !

I have some unanswered questions, which I could not find anything on the internet, about esp8266 , I want to use spi port of esp8266. Before it I check with probe the clock pin, there are huge noisy data or ı do not understand what it is ! I never see such a clock signal before. image is the below from the scope

SCR03.PNG (9.51 KiB) Viewed 13620 times

SCR04.PNG (9.24 KiB) Viewed 13620 times

I do not try the code you give above, If I try it , it will work ?

I work with nodemcu esp8266 , there is no problem like that , when I take the board there is no clock signal so I can simply use the spi port of the board?

I need information about spi port of the esp8266 what you produce. My knowledge just in limitation that it is connected to flash chip to get data !

Thanks for help..

[pratik]

Hello,

If you are using the Espressif nonOS or RTOS SDK to write your application, please use the following to set the GPIO to act as HSPI interface pins:

// Configure MUX to allow HSPI
WRITE_PERI_REG(PERIPHS_IO_MUX, 0x105);

// SCK, MOSI, MISO and CS
PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTDI_U, 2);
PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTCK_U, 2);
PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTMS_U, 2);
PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTDO_U, 2);

Not writing the correct value to the IO_MUX will cause problems like this in most cases.

[xPhyiscs]

Hey thanks for answer.

I am using arduino ide. With arduino ide, there is no possibility to use SPI ?

[pratik]

It is definitely possible, provided you code things right. Be it Arduino or any other interface - in the end it comes down to writing the proper values to the appropriate registers.
I personally am not familiar with the Arduino IDE + ESP8266 so I cannot help with this directly. But there might be libraries that get the job done.

[xPhyiscs]

Actually I am not fan of arduino ide.

To use esp which development environmet should be better ? Can you give me any link to set up ? Ayn tutorial ?

// Configure MUX to allow HSPI
WRITE_PERI_REG(PERIPHS_IO_MUX, 0x105);

// SCK, MOSI, MISO and CS
PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTDI_U, 2);
PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTCK_U, 2);
PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTMS_U, 2);
PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTDO_U, 2);

Also how can you learn this ? Where can I find documantation about these ?