Raspberry Pi drive PCD8544 course:

1. How to connect hardware:

2. The connection mode of B version



The insertion mode of B+ version: Please bear in mind that among 2*20P pin header of B+, the 2*13P pin header in the front are fully compatible with B version, namely their signal definition is exactly the same. So module program for B+ and B are totally compatible with each other!



Software:



1. Install wiring pi. First



   cd ~

git clone git://git.drogon.net/wiringPi

cd wiringPi

./build



2. Establish working directory



   cd ~

mkdir cpu_show



3. Download source code to  /home/pi/cpu_show through SFTP



4. Compile source code



   cd ~/cpu_show



cc -o cpushow pcd8544_rpi.c PCD8544.c  -L/usr/local/lib –lwiringPi



//Final execution and result-check

sudo ./cpushow



//////////////////////Knowledge on Contrast Modification//////////////////////////

// There are differences in contrast between each LCD, so if your found

//content displayed is too dark or too light,

//you’ll need to modify contrast variables of source code pcd8544_rpi.c, then recompile the source code and check the final result as well as corresponding changes!  

nano pcd8544_rpi.c



// lcd contrast 

//may be need modify to fit your screen!  normal: 30- 90 ,default is:45 !!!maybe modify this value!

int contrast = 45; 



//change this part. The default setting is 45. If it’s too dark, decrease a little bit, If it’s too light, increase a little bit. We recommend you decrease/increase by 5 points at a time.



//After modification, source code should be recompiled before running

cc -o cpushow pcd8544_rpi.c PCD8544.c  -L/usr/local/lib -lwiringPi

sudo ./cpushow



//////////////////////The End ///////////////////////