TS-7250-V3 LCD Header
The LCD header is a 0.1" pitch 2x7 header including GPIO. This is designed around compatibility with the HD44780 LCD controller which includes our LCD-LED. The LCD Data pins (7-14) are 5V tolerant. These will output up to 3.3V, and the remaining control IO and PWM are 3.3V tolerant. The TS-7250-V3 Debian images include a command lcdmesg. This can be used to write to our LCD-LED display.
For example, this would write to the display:
lcdmesg "line 1" "line 2" # Messages can also be piped to lcdmesg: echo -e "line 1\nline 2\n" | lcdmesg
For example, running:
lcdmesg Technologic Systems
Pin 4, the LCD_BIAS pin, is used to set the contrast on the LCD.
tshwctl --address 0x1c --poke16 0x0 # Writes minimum tshwctl --address 0x1c --poke16 0xf # Writes maximum
- PWM duty cycle controlled by FPGA Syscon reg 0x1c. This may need to be tuned depending on the environment or altitude where the display is used.