TS-7250-V3 LCD Header: Difference between revisions

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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 [https://www.embeddedarm.com/parts/LCD-LED 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 LCD header is a 0.1" pitch 2x7 header including GPIO.  This is designed around compatibility with the HD44780 LCD controller which includes our [https://www.embeddedTS.com/parts/LCD-LED 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 [https://github.com/embeddedTS/ts7100-utils/blob/master/src/lcdmesg.c lcdmesg].  This can be used to write to our [https://www.embeddedTS.com/parts/LCD-LED LCD-LED] display. 
 
For example, this would write to the display:
<source lang=bash>
lcdmesg "line 1" "line 2"
# Messages can also be piped to lcdmesg:
echo -e "line 1\nline 2\n" | lcdmesg
</source>
 
For example, running:
<source lang=bash>
lcdmesg Technologic Systems
</source>
will display:
 
[[File:LCD LED example.jpg|500px]]
 
Pin 4, the LCD_BIAS pin, is used to set the contrast on the LCD. 
<source lang=bash>
tshwctl --address 0x1c --poke16 0x0 # Writes minimum
tshwctl --address 0x1c --poke16 0xf # Writes maximum
</source>


{|  
{|  
Line 9: Line 30:
|-
|-
! Pin
! Pin
! IO Type
! Signal
! Signal
|-
|-
| 1
| 1
|
| [[#Board Rails|5V]]
| [[#Board Rails|5V]]
|-
|-
| 2
| 2
|
| GND
| GND
|-
|-
| 3
| 3
| LCD_RS [[#GPIO|GPIO Bank 2 IO 23]]
| [[#IO specifications|CPU 3.3V]]
| LCD_RS [[#GPIO|GPIO Chip 20a4000.gpio IO 21]]
|-
|-
| 4
| 4
| LCD_BIAS [[#PWM|PWM0]] / [[#GPIO|GPIO Bank 2 IO 24]] <ref>This pin is used to dynamically adjust contract on the LCD.  This may need to be tuned depending on the environment or altitude where the display is used.</ref>
| [[#IO specifications|CPU 3.3V]]
| LCD_BIAS <ref>PWM duty cycle controlled by [[#FPGA Syscon|FPGA Syscon reg 0x1c]].  This may need to be tuned depending on the environment or altitude where the display is used.</ref>
|-
|-
| 5
| 5
| LCD_EN [[#GPIO|GPIO Bank 5 IO 20]]
| [[#IO specifications|CPU 3.3V]]
| LCD_EN [[#GPIO|GPIO Chip 50004010.fpga_gpio IO 20]]
|-
|-
| 6
| 6
| LCD_WR [[#GPIO|GPIO Bank 5 IO 19]]
| [[#IO specifications|CPU 3.3V]]
| LCD_WR [[#GPIO|GPIO Chip 50004010.fpga_gpio IO 19]]
|-
|-
| 7
| 7
| LCD D1 [[#GPIO|GPIO Bank 2 IO 9]]
| [[#IO specifications|CPU 3.3V+QS3861]]
| LCD D1 [[#GPIO|GPIO Chip 20a4000.gpio IO 9]]
|-
|-
| 8
| 8
| LCD D0 [[#GPIO|GPIO Bank 5 IO 10]]
| [[#IO specifications|CPU 3.3V+QS3861]]
| LCD D0 [[#GPIO|GPIO Chip 50004010.fpga_gpio IO 10]]
|-
|-
| 9
| 9
| LCD D3 [[#GPIO|GPIO Bank 5 IO 11]]
| [[#IO specifications|CPU 3.3V+QS3861]]
| LCD D3 [[#GPIO|GPIO Chip 50004010.fpga_gpio IO 11]]
|-
|-
| 10
| 10
| LCD D2 [[#GPIO|GPIO Bank 5 IO 12]]
| [[#IO specifications|CPU 3.3V+QS3861]]
| LCD D2 [[#GPIO|GPIO Chip 50004010.fpga_gpio IO 12]]
|-
|-
| 11
| 11
| LCD D5 [[#GPIO|GPIO Bank 5 IO 15]]
| [[#IO specifications|CPU 3.3V+QS3861]]
| LCD D5 [[#GPIO|GPIO Chip 50004010.fpga_gpio IO 15]]
|-
|-
| 12
| 12
| LCD D4 [[#GPIO|GPIO Bank 5 IO 16]]
| [[#IO specifications|CPU 3.3V+QS3861]]
| LCD D4 [[#GPIO|GPIO Chip 50004010.fpga_gpio IO 16]]
|-
|-
| 13
| 13
| LCD_D7 [[#GPIO|GPIO Bank 5 IO 17]]
| [[#IO specifications|CPU 3.3V+QS3861]]
| LCD_D7 [[#GPIO|GPIO Chip 50004010.fpga_gpio IO 17]]
|-
|-
| 14
| 14
| LCD_D6 [[#GPIO|GPIO Bank 5 IO 18]]
| [[#IO specifications|CPU 3.3V+QS3861]]
| LCD_D6 [[#GPIO|GPIO Chip 50004010.fpga_gpio IO 18]]
|}
|}
|  
|  
Line 58: Line 94:


<References />
<References />
The TS-7250-V3 Debian images include a command [https://github.com/embeddedarm/ts7100-utils/blob/master/src/lcdmesg.c lcdmesg].  This can be used to write to our [https://www.embeddedarm.com/parts/LCD-LED LCD-LED] display. 
For example, this would write to the display:
<source lang=bash>
lcdmesg "line 1" "line 2"
# Messages can also be piped to lcdmesg:
echo -e "line 1\nline 2\n" | lcdmesg
</source>
For example, running:
<source lang=bash>
lcdmesg Technologic Systems
</source>
will display:
[[File:LCD LED example.jpg|500px]]

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:

LCD LED example.jpg

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
Pin IO Type Signal
1 5V
2 GND
3 CPU 3.3V LCD_RS GPIO Chip 20a4000.gpio IO 21
4 CPU 3.3V LCD_BIAS [1]
5 CPU 3.3V LCD_EN GPIO Chip 50004010.fpga_gpio IO 20
6 CPU 3.3V LCD_WR GPIO Chip 50004010.fpga_gpio IO 19
7 CPU 3.3V+QS3861 LCD D1 GPIO Chip 20a4000.gpio IO 9
8 CPU 3.3V+QS3861 LCD D0 GPIO Chip 50004010.fpga_gpio IO 10
9 CPU 3.3V+QS3861 LCD D3 GPIO Chip 50004010.fpga_gpio IO 11
10 CPU 3.3V+QS3861 LCD D2 GPIO Chip 50004010.fpga_gpio IO 12
11 CPU 3.3V+QS3861 LCD D5 GPIO Chip 50004010.fpga_gpio IO 15
12 CPU 3.3V+QS3861 LCD D4 GPIO Chip 50004010.fpga_gpio IO 16
13 CPU 3.3V+QS3861 LCD_D7 GPIO Chip 50004010.fpga_gpio IO 17
14 CPU 3.3V+QS3861 LCD_D6 GPIO Chip 50004010.fpga_gpio IO 18

TS-7250-V3-LCD Header.svg

  1. ↑ 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.
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