A non-standard Q-SPI communication application

[stanley_atc]

Hello,

    I am developing a product with a non-standard Q-SPI (4 data out, 1 data in) on nRF52832 with s132. The clock of non-standard Q-SPI requested more than 2MHz. I would like to develop the communication protocol by SW, like a SW I2C. Unfortunately, there was just a 1MHz clock output from GPIOs when I tried to toggle a GPIO. Have anyone can let me know that can nRF52832 do this application for the special SPI interface? Is possible to get a clock more than 2MHz on GPIOs? if so, how do I config the clock source to GPIO? 

[Jørgen Holmefjord]

Hi,

It is possible to toggle a GPIO at up to 8 MHz in nRF52832 using a TIMER, PPI and GPIOTE. See for instance this post.

Best regards,
Jørgen

[stanley_atc]

Thanks, I will try.

[stanley_atc]

Hi,

    I checked the post you provided. Is possible I can put the data pins during the toggle edge as data in/out?

[Jørgen Holmefjord]

No, it is not possible to clock out data using this method, only toggle a clock signal. There is no way to get the data directly from RAM to GPIO using this method. An alternative solution could be to use PWM, which support EasyDMA, but we do not have any example code for this.

[stanley_atc]

How can it run with s132? I have tried to implement it in my peripheral initial. Nothing came out.