PIC12F1822 and ST7735 SPI TFT Example

Interfacing PIC12F1822 with ST7735 SPI TFT display

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.

/* PIC12F1822 with ST7735R TFT display example CCS PIC C code
   ST7735 TFT display driver for CCS PIC C compiler is required
   coordinates are (x, y) starting from upper left corner (0, 0)
   http://ccspicc.blogspot.com/
   electronnote@gmail.com
*/

// TFT module connections
#define TFT_CS   PIN_A5
#define TFT_DC   PIN_A4
#define TFT_SPI_HARDWARE
// End TFT module connections

#include <12F1822.h>
#fuses NOMCLR INTRC_IO PLL_SW
#use delay(clock = 32000000)
#include <ST7735_TFT.c>
#use fast_io(A)

unsigned int8 k = 0;
char *text = "Hello World!";
void main() {
  setup_oscillator(OSC_8MHZ | OSC_PLL_ON);                      // Set internal oscillator to 8MHz with PLL enabled (32MHz)
  setup_adc_ports(NO_ANALOGS);                                  // Configure all pins as digital
  TFT_BlackTab_Initialize();
  fillScreen(ST7735_BLACK);
  drawtext(28, 10, text, ST7735_YELLOW, ST7735_BLACK, 1);       // Draw text at coordinates (28, 10) with yellow color and black background. Size = 1
  strcpy(text, "Hello");
  drawtext(19, 30, text, ST7735_RED, ST7735_BLACK, 3);          // Draw text at coordinates (19, 30) with red color and black background. Size = 3
  strcpy(text, "World!");
  drawtext(10, 70, text, ST7735_CYAN, ST7735_BLACK, 3);         // Draw text at coordinates (10, 70) with cyan color, black background. Size = 3
  while(TRUE){
    sprintf(text,"%03u",k);                                     // Place k into text with 3 numbers max and zeroes
    drawtext(37, 120, text,  ST7735_GREEN, ST7735_BLACK, 3);    // Draw text at coordinates (37, 120) with green color and black background. Size = 3
    delay_ms(500);
    k++;
  }
}

Example Video: