Insane 80MHz spi speed on TFT with SPI_DEVICE_NO_DUMMY
Posted: Fri Aug 03, 2018 2:45 am
I was trying to improve speed od tft displaying live video stream (from mouse) and got error when set clock_speed_hz>60Mhz
It prompted to ignore the error with SPI_DEVICE_NO_DUMMY and operate at desired frequency at your own risk
So here it is:
I managed to pull insane speed using wrover module and allocating buffer of half the size of the screen (320x240)
However I got ugly tearing effect so maybe someone could help how to wait for wertical sync on ILI9341
I tried to find something in datasheet but haven't figured it out. (I posted video here)
Also to mention I set the psram speed to 80MHz in menuconfig - it does make a huge difference
Has something to do with operation mode command.
Help would be appreciated )
It prompted to ignore the error with SPI_DEVICE_NO_DUMMY and operate at desired frequency at your own risk
So here it is:
Code: Select all
spi_device_interface_config_t devcfg={
.clock_speed_hz=80*1000*1000, //Clock out at 80 MHz
.mode=0, //SPI mode 0
.spics_io_num=PIN_NUM_CS, //CS pin
.queue_size=7, //We want to be able to queue 7 transactions at a time
.pre_cb=lcd_spi_pre_transfer_callback, //Specify pre-transfer callback to handle D/C line
.flags=SPI_DEVICE_NO_DUMMY // ignore errors
};However I got ugly tearing effect so maybe someone could help how to wait for wertical sync on ILI9341
I tried to find something in datasheet but haven't figured it out. (I posted video here)
Also to mention I set the psram speed to 80MHz in menuconfig - it does make a huge difference
Has something to do with operation mode command.
Help would be appreciated )