NRF52840 QSPI Driver LCD（LCD Driver IC GC9C01）

[Jgong]

Hi ，Nordic team

     I applied QSPI driver QSPILCD and encountered the following problems:
     question 1, use nrf_drv_qspi_write write data: header and tail will be a few more bytes.(note image)

      

     The green box is the data to be sent, how to remove the head and tail? Using nrfx_qspi_cinstr_quick_send won't solve this problem, but this is only 9 bytes.

     Question 2: QSPI hardware writes RGB565 to the screen, No callback (void qspi_lcd_handler(nrf_drv_qspi_evt_t event, void * p_context) is entered when the written color contains blue, but adding a 10K pull-down resistor to the pin of QSPI_IO1 works

[haakonsh]

Can you share the datasheet of your LCD? 

1. The QSPI interface can be used as a regular flash device interface or as a single line SPI device using custom instructions. 
   
   
2. Can you share a logic scope of the QSPI lines? 

You might find this relevant blog post by a colleague useful.

[Jgong]

Sorry ! So late reply to you , The problem has already been solved. Thanks.

[LPJ]

Hi Haakonsh

Does your colleague have a repo for the blogpost? I'm looking into driving a LCD using QSPI on nRF5340, and a repo would be really helpfull.

Thank!

[Kenneth]

There is nothing but what you can see in the link,

Kenneth

[Wayne_Chang]

hi all,

Is there any solution update here?

I also encountered the same problem. The red area is the data I sent, but the blue area is not what I sent. Is this caused by the hardware design, or can I modify it on the software side?

I already read the post that provided by haakonsh but it didn't say any thing about this.




Wayne