Difference between revisions of "Raspberry Pi LCD program"
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| + | == Download == | ||
| + | |||
| + | download the program source from http://www.bitwizard.nl/software/bw_lcd.c | ||
| + | |||
| + | You will need a kernel with spidev enabled and the raspberry pi SPI driver included. See [[Raspberry pi spi kernel]] | ||
| + | |||
| + | This program works well with the rpi_serial board http://www.bitwizard.nl/catalog/product_info.php?cPath=25&products_id=69 and the spi_lcd board: http://www.bitwizard.nl/catalog/product_info.php?products_id=89 . | ||
| + | |||
== Command line arguments == | == Command line arguments == | ||
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-d <delay> delay between bytes. default: 15 us. | -d <delay> delay between bytes. default: 15 us. | ||
| + | LCD options: | ||
-a <addr> address of display, defaults to 0x82 | -a <addr> address of display, defaults to 0x82 | ||
-p <c>,<l> Jump to line <l> and character <c> | -p <c>,<l> Jump to line <l> and character <c> | ||
-t <text> print text | -t <text> print text | ||
-T <c>,<l> <text> Print tekst starting at line <l> character <c>. | -T <c>,<l> <text> Print tekst starting at line <l> character <c>. | ||
| − | -b <b> | + | -b < b > Adjust backlight level |
-c <c> Adjust contrast | -c <c> Adjust contrast | ||
-C clearscreen | -C clearscreen | ||
-f <file> display text from file (not implemented yet). | -f <file> display text from file (not implemented yet). | ||
| + | |||
| + | general bw SPI options: | ||
| + | -r <reg> | ||
| + | -v <val> set register to value. Requires -r. | ||
== Example commands == | == Example commands == | ||
Print current date on line 0: | Print current date on line 0: | ||
| − | + | bw_lcd -p 0,0 -t `date +%m/%d/%Y` | |
Print the text "Hello World" on line 1, character 2: | Print the text "Hello World" on line 1, character 2: | ||
| − | + | bw_lcd -T 2,1 "Hello World" | |
Print the contents of "textfile": | Print the contents of "textfile": | ||
| − | + | bw_lcd -f textfile | |
Write two different strings to two daisy-chained displays: | Write two different strings to two daisy-chained displays: | ||
| − | + | bw_lcd -a 82 -T 0,0 display0 | |
| − | + | bw_lcd -a 84 -T 0,0 display1 | |
| + | |||
| + | My Pi runs the following script every minute: | ||
| + | #! /bin/sh | ||
| + | |||
| + | ./bw_lcd -a 80 -C | ||
| + | ./bw_lcd -a 82 -C | ||
| + | ./bw_lcd -a 80 -T 0,0 'My wlan0 IP is' | ||
| + | ./bw_lcd -a 80 -T 0,1 `/sbin/ifconfig wlan0 | sed '/inet\ /!d;s/.*r://g;s/\ .*//g'` | ||
| + | ./bw_lcd -a 82 -T 0,0 'My eth0 IP is' | ||
| + | ./bw_lcd -a 82 -T 0,1 `/sbin/ifconfig eth0 | sed '/inet\ /!d;s/.*r://g;s/\ .*//g'` | ||
| + | This prints the IP addresses of both network interfaces on my two displays. | ||
Latest revision as of 11:45, 11 November 2015
Download
download the program source from http://www.bitwizard.nl/software/bw_lcd.c
You will need a kernel with spidev enabled and the raspberry pi SPI driver included. See Raspberry pi spi kernel
This program works well with the rpi_serial board http://www.bitwizard.nl/catalog/product_info.php?cPath=25&products_id=69 and the spi_lcd board: http://www.bitwizard.nl/catalog/product_info.php?products_id=89 .
Command line arguments
SPI options: -D <device> SPI device to use. default: /dev/spidev0.0 -s <speed> speed to use on the SPI bus default 0.5MHz. -d <delay> delay between bytes. default: 15 us.
LCD options: -a <addr> address of display, defaults to 0x82 -p <c>,<l> Jump to line <l> and character <c> -t <text> print text -T <c>,<l> <text> Print tekst starting at line <l> character <c>. -b < b > Adjust backlight level -c <c> Adjust contrast -C clearscreen -f <file> display text from file (not implemented yet).
general bw SPI options: -r <reg> -v <val> set register to value. Requires -r.
Example commands
Print current date on line 0:
bw_lcd -p 0,0 -t `date +%m/%d/%Y`
Print the text "Hello World" on line 1, character 2:
bw_lcd -T 2,1 "Hello World"
Print the contents of "textfile":
bw_lcd -f textfile
Write two different strings to two daisy-chained displays:
bw_lcd -a 82 -T 0,0 display0 bw_lcd -a 84 -T 0,0 display1
My Pi runs the following script every minute:
#! /bin/sh ./bw_lcd -a 80 -C ./bw_lcd -a 82 -C ./bw_lcd -a 80 -T 0,0 'My wlan0 IP is' ./bw_lcd -a 80 -T 0,1 `/sbin/ifconfig wlan0 | sed '/inet\ /!d;s/.*r://g;s/\ .*//g'` ./bw_lcd -a 82 -T 0,0 'My eth0 IP is' ./bw_lcd -a 82 -T 0,1 `/sbin/ifconfig eth0 | sed '/inet\ /!d;s/.*r://g;s/\ .*//g'`
This prints the IP addresses of both network interfaces on my two displays.
