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.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 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]]
 
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 21: Line 42:
|-
|-
| 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>
| 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
Line 58: Line 79:


<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]]

Revision as of 11:00, 12 July 2021

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 Signal
1 5V
2 GND
3 LCD_RS GPIO Bank 2 IO 21
4 LCD_BIAS [1]
5 LCD_EN GPIO Bank 5 IO 20
6 LCD_WR GPIO Bank 5 IO 19
7 LCD D1 GPIO Bank 2 IO 9
8 LCD D0 GPIO Bank 5 IO 10
9 LCD D3 GPIO Bank 5 IO 11
10 LCD D2 GPIO Bank 5 IO 12
11 LCD D5 GPIO Bank 5 IO 15
12 LCD D4 GPIO Bank 5 IO 16
13 LCD_D7 GPIO Bank 5 IO 17
14 LCD_D6 GPIO Bank 5 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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