Display TFT ST7789 (OshonSoft Basic).

Nigel Goodwin said:

They even work using software SPI, but the speed is appalling

It is useful though for testing purposes, or when you inadvertently allocated the PCB SPI pins to non-SPI pins on the PIC, while you can allocate most peripheral pins to various of the physical pins it's not universal, and varies from PIC to PIC.

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DogFlu66 said:

The SPI speed setting is 4Mhz with the system clock working as internal and at 64Mhz.
'Internal clock 64Mhz.
Call _Setup_Oscillator(_OSC_16MHz_HF)
Call _SET_PLL4(_PLL_ON)
Call _Interrupts_Mode(_DISABLE_PRIORITY)
'*********************************************
Call _SPI1_Init(_SPI_MODE2, _SPI_MASTER_SPEED1 | _SPI_ENABLE) 'CLK 4Mhz (64Mhz)

I have also been able to verify a basic error in the configuration of the SPI pins, I have used the following one, which is incorrect:
' Define MSSP module pins in SPI mode
Symbol _SPI_RST = PORTC.0 ' RST RESET pin
Symbol _SPI_DC = PORTC.1 ' DC (SS) Data/Command pin
Symbol _SPI_CS = PORTC.2 ' CS Chip Select pin
Symbol _SPI_SCK = PORTC.3 ' SCK as output
Symbol _SPI_SDI = PORTC .4 ' SDI as input -> SDO
Symbol _SPI_SDO = PORTC.5 ' SDO as output -> SDI

And you have to use the following:
' Define MSSP module pins in SPI mode
Symbol _SPI_RST = LATC.0 ' RST RESET pin
Symbol _SPI_DC = LATC.1 ' DC (SS) Data/Command pin
Symbol _SPI_CS = LATC.2 ' CS Chip Select pin
Symbol _SPI_SCK = LATC.3 ' SCK as output
Symbol _SPI_SDI = PORTC.4 ' SDI as input -> SDO
Symbol _SPI_SDO = LATC.5 ' SDO as output -> SDI

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camerart said:

Hi D,
Here is the SPI set-up on my PCBs:

This works with the Nokia screen and all of the other peripherals.

It may not be conventional, but I've got used to it.
The init_SPI is called for in the program.
C
View attachment 146585

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