TS-7250-V3 LCD Header: Difference between revisions
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| 3 | | 3 | ||
| [[#IO specifications|CPU 3.3V]] | | [[#IO specifications|CPU 3.3V]] | ||
| LCD_RS [[#GPIO|GPIO | | LCD_RS [[#GPIO|GPIO Chip 20a4000.gpio IO 21]] | ||
|- | |- | ||
| 4 | | 4 | ||
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| 5 | | 5 | ||
| [[#IO specifications|CPU 3.3V]] | | [[#IO specifications|CPU 3.3V]] | ||
| LCD_EN [[#GPIO|GPIO | | LCD_EN [[#GPIO|GPIO Chip 50004010.fpga_gpio IO 20]] | ||
|- | |- | ||
| 6 | | 6 | ||
| [[#IO specifications|CPU 3.3V]] | | [[#IO specifications|CPU 3.3V]] | ||
| LCD_WR [[#GPIO|GPIO | | LCD_WR [[#GPIO|GPIO Chip 50004010.fpga_gpio IO 19]] | ||
|- | |- | ||
| 7 | | 7 | ||
| [[#IO specifications|CPU 3.3V+QS3861]] | | [[#IO specifications|CPU 3.3V+QS3861]] | ||
| LCD D1 [[#GPIO|GPIO | | LCD D1 [[#GPIO|GPIO Chip 20a4000.gpio IO 9]] | ||
|- | |- | ||
| 8 | | 8 | ||
| [[#IO specifications|CPU 3.3V+QS3861]] | | [[#IO specifications|CPU 3.3V+QS3861]] | ||
| LCD D0 [[#GPIO|GPIO | | LCD D0 [[#GPIO|GPIO Chip 50004010.fpga_gpio IO 10]] | ||
|- | |- | ||
| 9 | | 9 | ||
| [[#IO specifications|CPU 3.3V+QS3861]] | | [[#IO specifications|CPU 3.3V+QS3861]] | ||
| LCD D3 [[#GPIO|GPIO | | LCD D3 [[#GPIO|GPIO Chip 50004010.fpga_gpio IO 11]] | ||
|- | |- | ||
| 10 | | 10 | ||
| [[#IO specifications|CPU 3.3V+QS3861]] | | [[#IO specifications|CPU 3.3V+QS3861]] | ||
| LCD D2 [[#GPIO|GPIO | | LCD D2 [[#GPIO|GPIO Chip 50004010.fpga_gpio IO 12]] | ||
|- | |- | ||
| 11 | | 11 | ||
| [[#IO specifications|CPU 3.3V+QS3861]] | | [[#IO specifications|CPU 3.3V+QS3861]] | ||
| LCD D5 [[#GPIO|GPIO | | LCD D5 [[#GPIO|GPIO Chip 50004010.fpga_gpio IO 15]] | ||
|- | |- | ||
| 12 | | 12 | ||
| [[#IO specifications|CPU 3.3V+QS3861]] | | [[#IO specifications|CPU 3.3V+QS3861]] | ||
| LCD D4 [[#GPIO|GPIO | | LCD D4 [[#GPIO|GPIO Chip 50004010.fpga_gpio IO 16]] | ||
|- | |- | ||
| 13 | | 13 | ||
| [[#IO specifications|CPU 3.3V+QS3861]] | | [[#IO specifications|CPU 3.3V+QS3861]] | ||
| LCD_D7 [[#GPIO|GPIO | | LCD_D7 [[#GPIO|GPIO Chip 50004010.fpga_gpio IO 17]] | ||
|- | |- | ||
| 14 | | 14 | ||
| [[#IO specifications|CPU 3.3V+QS3861]] | | [[#IO specifications|CPU 3.3V+QS3861]] | ||
| LCD_D6 [[#GPIO|GPIO | | LCD_D6 [[#GPIO|GPIO Chip 50004010.fpga_gpio IO 18]] | ||
|} | |} | ||
| | | |
Latest revision as of 10:10, 9 April 2024
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
will display:
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
Signals | Pin Layout | |||||||||||||||||||||||||||||||||||||||||||||
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- ↑ 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.