dsplover / TM1637-pico

Some c functions that uses the Raspberry Pi Picos pio functionality to send data to a TM1637 7-segment display.

TM1637-pico

Control TM1637 based 7-segment display from raspberry pi pico.

Features

• Display a positive 4 digit number or a negative 3 digit number.
• Display two positive 2 digit numbers with (or without) a colon in between.
• You can choose if you want leading zeros in both of the above cases.
• Display a 4 letter word.
• Display 4 or 2 digits of raw data.
• Choose the display brightness (on a 8 step scale).

The actual communication with the display is handled by the picos pio functionality. When a display function is called, some data is very quickly put into a buffer that the pio has access to. The pio will then, one bit at a time send the data to the TM1637 display. If you attempt to display too much in a short period of time, the buffer will become full. This will block further execution in the main program if even more data is sent to the display.

This library will only work with the 4 digit version of the display.

To get started have a look at the examples/demo.c file. The full documentation can be found here.

Setup

1. Download the files from this repository and put them in a folder somewhere.
2. In your CMAKE file: include(/path/to/folder/TM1637-pico/PicoTM1637.cmake) and target_link_libraries(your_target PicoTM1637)
3. In your c file: #include <PicoTM1637.h>

Wiring

TM1637	Target
CLK	A GPIO pin on the pico
DIO	A GPIO pin on the pico
VCC	5V
GND	Ground

Try the demo

Make sure CLK_PIN and PIO_PIN in demo.c is the same as what you have connected to your pico. Then build the project:

cd examples
mkdir build
cd build
cmake ..
make -j4

Then exporting to pico can be done

• Using uart:

  openocd -f interface/raspberrypi-swd.cfg -f target/rp2040.cfg -c "program TM1637_demo.elf verify reset exit"
  

• Over USB (Linux):

  Enable extra output (.uf2) in CMakeFiles.txt (and rebuild)

  Find what block device raspberry pi pico is connected to

  sudo fdisk -l
  

  Mount to file system

  mkdir /media/pico    
  sudo mount /dev/sdx1 /media/pico
  

  Where x is a letter from a, b, c, ...

  Copy TM1637_demo.uf2 file to pico, unmount

  cp TM1637_demo.uf2 /media/pico
  umount /dev/sdx1