Summary of Interfacing PIC12F1822 with ST7735 SPI TFT display
This post demonstrates interfacing a PIC12F1822 microcontroller with an ST7735 SPI 1.8" TFT display using the CCS PIC C compiler. It references a downloadable ST7735 driver, lists required hardware, shows using the PIC12F1822 internal oscillator with PLL to run at 32 MHz, and notes using TFT_BlackTab_Initialize for ST7735R/ ST7735S (Black Tab) modules. The project uses the PIC's single SPI module and was compiled with CCS PIC C compiler v5.051.
Parts used in the PIC12F1822 and ST7735 SPI TFT Example:
- PIC12F1822 Microcontroller
- ST7735R or ST7735S 1.8 inch SPI TFT Display (Black Tab shown)
- 5 x 1K Resistors
- +5V Power Supply Source
- Breadboard
- Jumper Wires
- CCS PIC C compiler (used to compile code, v5.051 mentioned)
- ST7735 SPI TFT display driver C file (downloaded and placed in project folder)
This post shows how to interface PIC12F1822 microcontroller with ST7735 SPI TFT display using CCS PIC C compiler.
For this interfacing we need a driver for the TFT display. Driver topic at the following link:
ST7735 SPI TFT Display Driver for CCS PIC C compiler
Or you can just download it directly from the following link:
ST7735 SPI TFT Display Driver
Put the downloaded C file in your project folder.
Required Components:
- PIC12F1822 Microcontroller
- ST7735R (or ST7735S) 1.8″ SPI TFT Display
- 5 x 1K Resistors
- +5V Power Supply Source
- Breadboard
- Jumper Wires
PIC12F1822 and ST7735 SPI TFT Example Circuit:
In this project PIC12F1822 internal oscillator is used and MCLR pin function is disabled.
PIC12F1822 and ST7735 SPI TFT Example CCS C code:
PIC12F1822 Has 1 SPI module, this module is used in this interfacing.
My TFT display is ST7735R Black Tap (ST7735S) and for initializing this type of TFT display I used the following line:
TFT_BlackTab_Initialize();
If you have a TFT display with green or red tabs or a TFT with ST7735B controller read the driver topic above.
Note that green, red and black tabs have the same controller ST7735R.
The following line enables internal oscillator @ 8MHz and also the PLL which makes the microcontroller runs at 32MHz (8MHz x 4).
setup_oscillator(OSC_8MHZ | OSC_PLL_ON);
This code is compiled with CCS PIC C compiler versions 5.051.
for more detail: PIC12F1822 and ST7735 SPI TFT Example
- What driver is required for the ST7735 SPI TFT display?
The ST7735 SPI TFT display driver for CCS PIC C compiler is required and can be downloaded as a C file for the project. - Which initialization function is used for a Black Tab ST7735 display?
The code uses TFT_BlackTab_Initialize() for ST7735R / ST7735S Black Tab displays. - Can the PIC12F1822 use its internal oscillator for this project?
Yes, the project uses the PIC12F1822 internal oscillator with PLL enabled to run at 32MHz. - What oscillator setup line is used to run the PIC12F1822 at 32MHz?
The line setup_oscillator(OSC_8MHZ | OSC_PLL_ON); enables the internal 8MHz oscillator and PLL to run at 32MHz. - How many SPI modules does PIC12F1822 have for this interfacing?
PIC12F1822 has one SPI module which is used for the TFT interfacing. - Are green, red, and black tab ST7735 displays using the same controller?
Yes, green, red, and black tab displays use the same ST7735R controller, though initialization may differ. - What compiler version was used to compile the example code?
The example was compiled with CCS PIC C compiler version 5.051. - Where should the downloaded ST7735 driver file be placed?
The downloaded C driver file should be placed in the project folder.
