How can we easily implement SPI using Microchip PIC16C5X series devices, using some GPIO. If firmware achievable to implement a slave/master interface.
Thanks for everyones input here....!
How to implement SPI using low-cost Microchip PIC16C5X series
Feb 19, 2004
4 Replies
SPI (master) is extremely easy to do in software on any micro - just wiggle the clock line and squirt the bits out.
I've implemented software SPI on the AVR '2313, with several slaved to a mid-range PIC with hardware SPI as the master. It was quite easy. You should be able to do the same with your PIC.
Leon
Leon Heller, G1HSM
Email: aqzf13@dsl.pipex.com
My low-cost Philips LPC210x ARM development system:
http://www.geocities.com/leon_heller/lpc2104.html
Should give you the general idea (untested):
spi_writebyte: movwf tmp movlw 8 movwf cntr $1 btfss tmp,0 bcf spi_out btfsc tmp,0 bsf spi_out
bsf spi_clk bcf spi_clk
rrcf tmp decfsz cntr goto $1
return
;-----------------
spi_readbyte: movlw 8 movwf cnt clrf tmp $1 rrcf tmp
bsf spi_clk btfsc spi_in bsf tmp,7 bcf spi_clk
decfsz cntr goto $1
movfw tmp return
Max
Look at some of the C compilers for the PICs. At least one (CCS,
formatting link
) has built in support for SPI master. If the chip as SPI hardware you can target the function for that or use just about any combination of I/O pins.
Also look at the Microchip application notes for SPI:
formatting link
Rob Young snipped-for-privacy@ieee.org
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