Raspberry Pi Forums

... for pin in [DIN, SCLK, DC, RST, SCE]: wiringpi.pinMode(pin, ON) wiringpi.pinMode(LED,2) wiringpi.pwmWrite(LED,128) def SPI(value): # data = DIN # clock = SCLK # MSB first for i in reversed(xrange(8)): wiringpi.digitalWrite(DIN, (value >> i) & 1) wiringpi.digitalWrite(SCLK, ...

SAA

... python script to create sockets and the RPi.GPIO library to control the pins and interfaces with my iPhone/iPad app. Im hoping to get i2C and SPI working soon and have it send back data to the iDevice.

c g

The SPI controllers support bit lengths up to 32 bit ( http://www.raspberrypi.org/wp-content/u ... herals.pdf ).

I'd assume it's just a limitation of the driver, but you better ask Chris Boot ( http://www.bootc.net ), he's the developer.

devnull

Thanks very much, that's very helpful. But I wonder if the developer has hard-coded the SPI to only run in 8 bit mode because of hardware limitation, or because that's what he felt most systems would use ? How would I found out whether this is a limitation of the hardware ...

c g

BCM2708 is the family, BMC2835 is the specific implementation of the SoC that is used here. Have a look into the sources of the kernel's SPI driver at https://github.com/raspberrypi/linux/blob/rpi-3.2.27/drivers/spi/spi-bcm2708.c#L238 I might be mistaken, but to me this looks like that you ...

c g

According to the sources of the spi_bcm2708 module, 9 bits per word is not supported.

devnull

OK, seems like sending data with bit size other than 8 (the default) results in a kernel panic. Here's the dump: [ 92.076174] Unable to handle kernel NULL pointer dereference at virtual address 00000000 [ 92.183061] pgd = c0004000 [ 92.224491] [00000000] *pgd=00000000 [ 92.276552] Internal error: Oo...

devnull

... I have now reverted to spidev to get better performance rather than bit bashing. But I need to operate in 9 bit mode, and as soon as I change the SPI port to 9 bit using the bpw attribute and then send the writebytes() function, it crashes / hangs the entire system. I am assuming that writebytes() ...

devnull

... an old breakout board I bought from sparkfun several years ago (they have since revised the design). This is a great little display, it uses 9 Bit SPI and is supplied with 2 different chipsets, one from EPSON and the other from Philips, the chipset I have is Epson, but it would not take much to ...

SiriusHardware

... the bus concept - but then I suppose it could be argued that if you want to talk to something else these days you are more likely to do it via SPI or I2C or USB. However, there are still plenty of useful devices around which communicate via a parallel bus, and the lack of a 'clean' 8-bit user ...

timhoffman

There is a python-kmod wrapper for kmod access. You need to get it from here https://github.com/agrover/python-kmod You will need to install libkmod-dev (sudo apt-get install libkmod-dev) (and possibly do a sudo apt-get update, if you haven't updated your raspbian package sources lately). The just f...

Boezelman

... for char in text: if char == '\n': self.cmd(0xC0) # next line else: self.cmd(ord(char),True) GPIO.setmode(GPIO.BCM) DEBUG = 1 LOGGER = 1 # read SPI data from MCP3008 chip, 8 possible adc's (0 thru 7) def readadc(adcnum, clockpin, mosipin, misopin, cspin): if ((adcnum > 7) or (adcnum < 0)): return ...

Grumpy Mike

The purple ones are dedicated to SPI. No they are not. You are free to use them how you want BUT if you choose one of the alternative functions one of these alternative functions are SPI. All pins are GPIO pins first and specialised functions ...

... # extended mode lcd_cmd(0x14) # bias lcd_cmd(contrast) # vop lcd_cmd(0x20) # basic mode lcd_cmd(0xc) # non-inverted display cls() def SPI(c): # data = DIN # clock = SCLK # MSB first # value = c for i in xrange(8): wiringpi.digitalWrite(DIN,((c & (1 << (7-i))) > 0)) wiringpi.digitalWrite(SCLK, ...

Boezelman

... GPIO.output(LCD_E, True) time.sleep(E_PULSE) GPIO.output(LCD_E, False) time.sleep(E_DELAY) GPIO.setmode(GPIO.BCM) DEBUG = 1 LOGGER = 1 # read SPI data from MCP3008 chip, 8 possible adc's (0 thru 7) def readadc(adcnum, clockpin, mosipin, misopin, cspin): if ((adcnum > 7) or (adcnum < 0)): return ...

joan

I think the edit button appears in the same place as "report this post" etc. See the FAQ for details. http://www.raspberrypi.org/phpBB3/faq.php#f2r1

Check here for the pins to use. The green ones are general, undedicated, pins to use as you wish. The purple ones are dedicated to SPI.

joan

... for char in text: if char == '\n': self.cmd(0xC0) # next line else: self.cmd(ord(char),True) GPIO.setmode(GPIO.BCM) DEBUG = 1 LOGGER = 1 # read SPI data from MCP3008 chip, 8 possible adc's (0 thru 7) def readadc(adcnum, clockpin, mosipin, misopin, cspin): if ((adcnum > 7) or (adcnum < 0)): return ...

Boezelman

... a website fot datalogging) #!/usr/bin/env python import time import os import RPi.GPIO as GPIO GPIO.setmode(GPIO.BCM) DEBUG = 1 LOGGER = 1 # read SPI data from MCP3008 chip, 8 possible adc's (0 thru 7) def readadc(adcnum, clockpin, mosipin, misopin, cspin): if ((adcnum > 7) or (adcnum < 0)): return ...

POSitality

... side of the display to get user responses. Bit like the buttons at the side of hole-in-the wall machines. This is why I asked if the RPi's 'real' SPI output is easy to program as they'll be more GPIO lines left. Ofc... I need to sober up a bit first! Maybe tomorrow :) Regards, Andy

BlackJack

... # Set pin directions. wiringpi.wiringPiSetup() wiringpi.wiringPiGpioMode(ON) for pin in [DIN, SCLK, DC, RST, LED]: wiringpi.pinMode(pin, ON) def SPI(value): # data = DIN # clock = SCLK # MSB first for i in reversed(xrange(8)): wiringpi.digitalWrite(DIN, (value >> i) & 1) wiringpi.digitalWrite(SCLK, ...

... set up an extra GPIO line I guess, maybe if you wanted two or three of these running (dunno how many lines we have left!) BTW... we are emulating SPI via the GPIO lines on the RPi. Is this stuff easier or harder using the RPi's own SPI outputs? Onto the fun times! I erm... couldn't be bothered ...

POSitality

... set up an extra GPIO line I guess, maybe if you wanted two or three of these running (dunno how many lines we have left!) BTW... we are emulating SPI via the GPIO lines on the RPi. Is this stuff easier or harder using the RPi's own SPI outputs? Onto the fun times! I erm... couldn't be bothered ...

Rumour has it P1-12 is a PWM pin, but I haven't seen any example code. There are also some chips you can connect to the SPI/I2C buses to generate PWM outputs. On a more general Analogue note, gnibbler has described how to attach a DDS over on Raspberry Pi.SE . As for python "current ...

mobeyduck

Rumour has it P1-12 is a PWM pin, but I haven't seen any example code. There are also some chips you can connect to the SPI/I2C buses to generate PWM outputs. On a more general Analogue note, gnibbler has described how to attach a DDS over on Raspberry Pi.SE . As for python "current ...

alexchamberlain

Rumour has it P1-12 is a PWM pin, but I haven't seen any example code. There are also some chips you can connect to the SPI/I2C buses to generate PWM outputs.

On a more general Analogue note, gnibbler has described how to attach a DDS over on Raspberry Pi.SE.

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