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OK. Here is a Python solution without calling external applications to reload the driver. It basically tests that the SPI GPIO pins are configured for the proper operation. If not, it prints a warning and updates the configuration. Nice work Bill. That's a bit advanced :ugeek: for ...

bgreat

OK. Here is a Python solution without calling external applications to reload the driver. It basically tests that the SPI GPIO pins are configured for the proper operation. If not, it prints a warning and updates the configuration. SPI configuration test/update: # For SPI configuration ...

The spidev driver relies on the spi_bcm2708 driver which allocates and configures the SPI pin resources when it first loads. The spi_bcm2708 driver assumes it has complete ownership and no other software will modify the configuration of those resources. When the pin ...

bgreat

One thing I,ve noticed is that my 'old' code, one that uses the right wiring for SPI, but that does not use the spidev routines will upset subsequent use of the the spidev versions of the code. The spidev code will run without errors, but you'll get a blank screen. ...

One thing I,ve noticed is that my 'old' code, one that uses the right wiring for SPI, but that does not use the spidev routines will upset subsequent use of the the spidev versions of the code. The spidev code will run without errors, but you'll get a blank screen. ...

cae2100

yea, I know, when you use other pins, you have to emulate the spi interface through software, this is called bit banging. also, the 74hc595 itself uses an spi interface to control the chip, thats what I meant by it using SPI interface

mignev

This is not true! You can use any digital pin to control the shift register

) As you can see i don't use SPI pins to control the shift register

cae2100

the 74hc595 uses an SPI interface to be controlled from the raspberry pi or any microcontroller.
I used to mess with PIC microcontrollers and have used that chip a few times to add 7 segment displays to my projects.

mignev

Hi,
nice lib but what is common between shift registers and SPI?

cae2100

nice use of bitbanging SPI port, have you seen the SPI-Py library? it's the one I use and it uses the actual SPI interface on the raspberry pi, so it runs faster and hardware based.

https://github.com/lthiery/SPI-Py/wiki/Functions

tzj

Got it working through spi, but just displyed lines when attempting to display a bitmap. (Damn forum wouldn't let me attach it

)

bgreat

... 1 (256MB) board. But this evening after fully updating the Raspbian image it is working flawlessly. I'm not sure what may have changed, but the SPI code works with Rev 1 and Rev 2 boards for me as of today. I am posting my code again, just in case there is some correction I unknowingly introduced. ...

scruss wrote:
bgreat wrote:Anyone else out there successfully using hardware SPI on a Rev 1 Raspberry Pi?
Yup, my clock demo was on an R1. Raspbian, with all latest updates. The firmware may not quite be the latest — couple or three weeks old, maybe.

And now it's on the front page

scruss

bgreat wrote:Anyone else out there successfully using hardware SPI on a Rev 1 Raspberry Pi?

Yup, my clock demo was on an R1. Raspbian, with all latest updates. The firmware may not quite be the latest — couple or three weeks old, maybe.

bgreat wrote: Any one else out there successfully using hardware SPI on a Rev 1 Raspberry Pi?

Enjoy!
Bill

Yes, but using the py-spidev module I linked to earlier in the thread. Works on revs 1 & 2. Not in this context either, but with dacs and adcs.

bgreat

... but this will probably not get any serious attention until the weekend when I have some time. Any one else out there successfully using hardware SPI on a Rev 1 Raspberry Pi? Enjoy! Bill

bgreat

... speed. Ok. I've reproduced your issue on another of my Raspberry Pi's. I am still trying to track the root cause, but on my Rev 2 board, the SPI version works and on my Rev 1 board the SPI version does not work. Enjoy! Bill

williamhbell

Maybe an issue with the SPI driver. What OS image are you using? I have done all of my testing with the Raspbian Wheezy (2012-12-16) image. Hi Bill, I'm using the 2012-12-16 Raspbian Wheezy image after all updates. The spidev interface ...

bgreat

I can see no reason for it to not work.

Maybe an issue with the SPI driver. What OS image are you using? I have done all of my testing with the Raspbian Wheezy (2012-12-16) image.

Enjoy!
Bill

williamhbell

The pin connection from the code is the expected connection. The output indicates the code is successfully using the SPI interface (it's just the time to build an image and send to the display). The display only receives data and can not respond, so there is no simple way from the ...

Many thanks again to bgreat for the hardware SPI functionality.
For those of you purchasing my Nokia Pi LCD add on board from now on, the module will be reworked to make use of these improvements.
http://www.raspberrypi.org/phpBB3/viewt ... 59&t=14913

Cheers,
Texy

bgreat

The pin connection from the code is the expected connection. The output indicates the code is successfully using the SPI interface (it's just the time to build an image and send to the display). The display only receives data and can not respond, so there is no simple way from the ...

williamhbell

CE -- pin 24 (SPI_CE0) or pin 26 (SPI_CE1) DIN -- pin 19 (SPI_MOSI) CLK -- pin 23 (SPI_SCLK) LED -- pin 12 (PWM0) to allow varying the brightness, otherwise any free GPIO RST -- pin 8, otherwise any free GPIO DC -- pin 10, otherwise ...

gastly

... file : http://www.raspberrypi.org/phpBB3/viewtopic.php?f=32&t=9814&start=100#p261609 Wow, thanks you nailed it! That was the problem, the SPI module was blacklisted don't know why it's blacklisted by default though. And the LED's not lighting up at the start was because I hooked the LED's ...

gastly

... 116 Traceback (most recent call last): File "nokiaLCD.py", line 296, in <module> noki = NokiaSPI() File "nokiaLCD.py", line 158, in __init__ self.spi.open(self.dev[0],self.dev[1]) IOError: [Errno 2] No such file or directory Clearly it's not detecting the screen :cry: I've checked the wiring a ...

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