Difference between revisions of "Raspberry Pi LCD program"
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You will need a kernel with spidev enabled and the raspberry pi SPI driver included. See [[Raspberry pi spi kernel]] |
You will need a kernel with spidev enabled and the raspberry pi SPI driver included. See [[Raspberry pi spi kernel]] |
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Currently you also need the http://www.bitwizard.nl/software/gpio_spi_i2c_20120419.tgz programs: You need to set gpio 7 through 11 to "ALT0": |
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gpio_setfunc 7 ALT0 |
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gpio_setfunc 8 ALT0 |
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gpio_setfunc 9 ALT0 |
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gpio_setfunc 10 ALT0 |
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gpio_setfunc 11 ALT0 |
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This won't be neccesary when this code is included in the SPI driver. |
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== Command line arguments == |
== Command line arguments == |
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Revision as of 12:31, 7 June 2012
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
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