- 018 How to stack
- 017 Brainf___ machine
- 016 Formal verification
- 015 How to count
- 014 Connecting FPGA to a computer
- 013 Binary numeric screen mode
- 012 VESA output by FPGA
- 011 Programming Xilinx Spartan 6
- 010 Learning basics of Verilog
- 009 Improvements in the blog engine
- 008 Migrating to AWS
- 007 LCD screens
- 006 Joule thief
- 005 Hall effect sensors
- 004 Constant acceleration revisited
- 003 Digital pendulum
- 002 Driving stepper motor
- 001 Play with forth and STM32
- 000 Hello world
LCD Screens
Nothing really interesting here. I just want to document how to connect two
LCD screens to a blue pill.
Actually it's not a blue pill.
It's black.
Some pins are connected differently. E.g. onboard LED is not on PC13,
but on PB12.
ST7735 1.8'' TFT LCD
This one has 128x160 resolution.
Connect as follows.
STM32 3.3 --- VCC LCD
GND --- GND
AO --- CS
A1 --- RESET
C13 --- AO
A7 --- SDA
A5 --- SCK
3.3 --- LED
I used Adafruit_GFX library version ported to STM32. To test it I took example from original Adafruit library and changed pin numbers.
--- libraries/Adafruit_ST7735/examples/graphicstest/graphicstest.ino 2018-03-30 22:13:14.870036019 +0200 +++ st7735-test/st7735-test.ino 2018-03-31 22:51:22.025625036 +0200 @@ -21,17 +21,17 @@ MIT license, all text above must be included in any redistribution ****************************************************/ -#include <Adafruit_GFX.h> // Core graphics library +#include <Adafruit_GFX_AS.h> // Core graphics library #include <Adafruit_ST7735.h> // Hardware-specific library #include <SPI.h> // For the breakout, you can use any 2 or 3 pins // These pins will also work for the 1.8" TFT shield -#define TFT_CS 10 -#define TFT_RST 9 // you can also connect this to the Arduino reset +#define TFT_CS PA0 +#define TFT_RST PA1 // you can also connect this to the Arduino reset // in which case, set this #define pin to 0! -#define TFT_DC 8 +#define TFT_DC PC13 // A0 // Option 1 (recommended): must use the hardware SPI pins // (for UNO thats sclk = 13 and sid = 11) and pin 10 must be
ILI93.. 2.4'' TFT LCD
This one has 320x240 resolution and is touch sensitive. Image can be sent
serially or by 8-bit data bus. I used data bus for the speed sake.
Adafruit library port can be found here. It was modified by an author of this instructable to use different pins. Unfortunately I couldn't find it on Github. There is a zip file to download.
An author of the first library admits that this one is better. I'm thinking about porting oscilloscope code to it.
Some documentation about display and drivers can be found here.