@tank
While the last alpha version of RISC OS could talk to the I2C lines, do you know if there is any way of switching it over to the second I2C bus that appears in the revision 2 boards?
Search found 936 matches
- Mon Oct 29, 2012 10:20 pm
- Forum: RISCOS
- Topic: RISC OS released on Raspberry Pi
- Replies: 133
- Views: 31942
- Mon Oct 29, 2012 10:09 pm
- Forum: Interfacing (DSI, CSI, I2C, etc.)
- Topic: Drive MAX7219 with I2C with shell script
- Replies: 31
- Views: 11144
Re: Drive MAX7219 with I2C with shell script
It seems to be that only the MAX7221 uses the SPI protocol, and the MAX7219 uses an altered version, or something like that The front page of the data sheet says:- SPI, QSPI, MICROWIRE Serial Interface (MAX7221) QSPI and MICROWIRE are all variations of SPI. From the data sheet:- The MAX7219 and MAX...
- Sun Oct 28, 2012 10:24 pm
- Forum: RISCOS
- Topic: RISC OS released on Raspberry Pi
- Replies: 133
- Views: 31942
Re: RISC OS released on Raspberry Pi
Hopefully I will be showing this off at the Wakefield RISCOC computer club on Wednesday 7th November as I am giving them a talk that night.
Visitors welcome:-
http://www.wrocc.org.uk/
Visitors welcome:-
http://www.wrocc.org.uk/
- Sat Oct 27, 2012 8:25 pm
- Forum: Interfacing (DSI, CSI, I2C, etc.)
- Topic: I2C ADC
- Replies: 99
- Views: 32810
Re: I2C ADC
There are lots but they are in surface mount packages, can you cope with that?danielfilipe.mo wrote:Hi, I would like to known if anyone can tell me if there are any other A/D chip with I2C interface and at least 10-bit of resolution.
- Sat Oct 27, 2012 8:21 pm
- Forum: Interfacing (DSI, CSI, I2C, etc.)
- Topic: How to initilize the i2c and GPIO
- Replies: 4
- Views: 2507
Re: How to initilize the i2c and GPIO
I want to do the same I definitely do not mind to use any library. I assume English is not your first language. This line means that you would want to use a library if it is available, is that right? Have you got this document? http://www.raspberrypi.org/wp-content/uploads/2012/02/BCM2835-ARM-Perip...
- Fri Oct 26, 2012 8:44 pm
- Forum: Python
- Topic: When to declare variables as global
- Replies: 27
- Views: 8125
Re: When to declare variables as global
So where are these rules then?croston wrote:You should learn the rules first so you know how/where/why/when to break them.
Buried In the 10M worth of files files.
- Fri Oct 26, 2012 8:39 pm
- Forum: Interfacing (DSI, CSI, I2C, etc.)
- Topic: Drive MAX7219 with I2C with shell script
- Replies: 31
- Views: 11144
Re: Drive MAX7219 with I2C with shell script
Well if you don't know I am sure I can't guess.
- Fri Oct 26, 2012 8:36 pm
- Forum: Interfacing (DSI, CSI, I2C, etc.)
- Topic: How to initilize the i2c and GPIO
- Replies: 4
- Views: 2507
Re: How to initilize the i2c and GPIO
1. I want to use the GPIO pin 15 What for? You can't use it for I2C. I want to use equivalent function for "omap_register_i2c_bus" in pi's processor [BCM2708 ] Why do you want to do this when there are so many librarys that make using the I2C easy. What language do you want to use. To use the raw I...
- Thu Oct 25, 2012 9:14 pm
- Forum: HATs and other add-ons
- Topic: Gert Board Discontinued?
- Replies: 73
- Views: 19649
Re: Gert Board Discontinued?
Gert owns the name Gertboard and I think the copyright of the board design. As Gert is a name then it can not be registered as a trade mark. The Arduino people found that out. Anyway they would not be stupid enough to call it a Gertboard would they. As they said it will be new and exciting and just...
- Thu Oct 25, 2012 5:26 pm
- Forum: HATs and other add-ons
- Topic: Gert Board Discontinued?
- Replies: 73
- Views: 19649
Re: Gert Board Discontinued?
Given that Gert did not know anything about them stopping supplying the board it sounds unlikely he is involved in any modification.
I know that and you know that but I suspect that they do not.but any move by them to make a clone board without Gert would be suicide.
- Thu Oct 25, 2012 4:56 pm
- Forum: HATs and other add-ons
- Topic: Gert Board Discontinued?
- Replies: 73
- Views: 19649
Re: Gert Board Discontinued?
No but he is being paid a premium on each PCB they make is he not? With another board they would not have to pay him.Gert is not assembling or packaging the boards now, they are.
- Thu Oct 25, 2012 4:51 pm
- Forum: HATs and other add-ons
- Topic: No more Gert... kits
- Replies: 98
- Views: 20735
Re: No more Gert... kits
I have been using Farnell for over 35 years and have always had excellent service until the last 9 months or so. In that time there have been more errors in my orders than there has been in the last 34 years. Orders being lost, wrong parts, missing parts and so on. Something is going on, I feel all ...
- Thu Oct 25, 2012 4:35 pm
- Forum: HATs and other add-ons
- Topic: Gert Board Discontinued?
- Replies: 73
- Views: 19649
Re: Gert Board Discontinued?
My guess is that they are going to produce a ripoff clone using surface mount parts and nudge Gert out of it.
Mind you there will be hell to pay if they do.
Mind you there will be hell to pay if they do.
- Thu Oct 25, 2012 4:30 pm
- Forum: Interfacing (DSI, CSI, I2C, etc.)
- Topic: Best way to interface an analog input of 0.2v - 4.7v
- Replies: 2
- Views: 1297
Re: Best way to interface an analog input of 0.2v - 4.7v
You need to decide what sort of resolution you need, that is how accurate you want the reading. The simplest sort of A/D chip will split 0 to 5V into 256 levels, is that enough for you? This is know as an 8 bit conversion. As the resolution goes up so does the cost and complexity of the layout. You ...
- Thu Oct 25, 2012 4:26 pm
- Forum: Interfacing (DSI, CSI, I2C, etc.)
- Topic: GPIO & high voltage sensors
- Replies: 5
- Views: 4255
Re: GPIO & high voltage sensors
Try this:-
- Thu Oct 25, 2012 4:07 pm
- Forum: Interfacing (DSI, CSI, I2C, etc.)
- Topic: Drive MAX7219 with I2C with shell script
- Replies: 31
- Views: 11144
Re: Drive MAX7219 with I2C with shell script
Now something happened with my setup. it does't display anything. i2cdetect still sees chips, but display is blind? any ideas what to do? Find out what is working and what is not. You probably need a scope at this junction. Disconnect anything connected to the I2C chip and see if you can set / clea...
- Wed Oct 24, 2012 8:17 pm
- Forum: HATs and other add-ons
- Topic: Silly question
- Replies: 8
- Views: 2036
Re: Silly question
It is a bit of a puzzle because the Broadcom BCM2835 data sheet doesn't match up with the published schematics of the Pi. However unfortunately you are barking up the wrong tree. There are a few SPI buses in the BCM2835 and the one controlling the SD card on the Pi is different to the one that is on...
- Wed Oct 24, 2012 4:23 pm
- Forum: Interfacing (DSI, CSI, I2C, etc.)
- Topic: Drive MAX7219 with I2C with shell script
- Replies: 31
- Views: 11144
Re: Drive MAX7219 with I2C with shell script
Good, glad it worked out for you. 
- Wed Oct 24, 2012 4:20 pm
- Forum: Interfacing (DSI, CSI, I2C, etc.)
- Topic: GPIO & high voltage sensors
- Replies: 5
- Views: 4255
Re: GPIO & high voltage sensors
Your 5V IR sensor has what is known as an open collector output. That means it is just a transistor that pulls down, that is connects to ground. Therefore you can happily apply 5V to this sensor from the Pi, and connect the output to a GPIO input and either have a pull up resistor from the input to ...
- Wed Oct 24, 2012 3:35 pm
- Forum: Python
- Topic: WiringPi PWM in Python
- Replies: 11
- Views: 4768
Re: WiringPi PWM in Python
Is it using the hardware PWM or is it bit banging?I recommend just writing your own PWM code (I did it- how hard can it be!
Care to share Si.
- Wed Oct 24, 2012 1:01 pm
- Forum: HATs and other add-ons
- Topic: Improved parts in RS kit?
- Replies: 13
- Views: 4474
Re: Improved parts in RS kit?
Well nothing QRP from mefos wrote:72 de Jeff WD4ET
73 de G8HBR
- Tue Oct 23, 2012 4:57 pm
- Forum: HATs and other add-ons
- Topic: Improved parts in RS kit?
- Replies: 13
- Views: 4474
Re: Improved parts in RS kit?
The cheap ones that just have friction clips along the sides of the pins are a poor gamble. No they are not. I make a lot of stuff and I always use sockets and I have never had any trouble with reliability of stuff due to the sockets. I made a radio repeater logic box that operated 24 / 7 for 20 ye...
- Tue Oct 23, 2012 11:57 am
- Forum: HATs and other add-ons
- Topic: Gertboard vs. Arduino 32-bit Due
- Replies: 27
- Views: 17250
Re: Gertboard vs. Arduino 32-bit Due
Yes I am supposed to be getting a free one but I don't know when it will arrive.
but I don't know when it will arrive.- Tue Oct 23, 2012 11:18 am
- Forum: HATs and other add-ons
- Topic: Improved parts in RS kit?
- Replies: 13
- Views: 4474
Re: Improved parts in RS kit?
I just don't get the turned pin socket thing, I have avoided them as they mess up the legs on the IC and make them only usable in other turned pin sockets.IC sockets are all higher qulaity turned pin sockets.
I like the ones Farnell supplied and I would use them over turned pin any day.
- Tue Oct 23, 2012 11:14 am
- Forum: HATs and other add-ons
- Topic: Gertboard driving arduino Lol Shield
- Replies: 9
- Views: 3856
Re: Gertboard driving arduino Lol Shield
Yep now the LOL shield can ruin the Gert board instead of ruining your arduino.
Have you seen the schematic? It has no resistors in line with the LEDs so it over loads the output pins of the processor.
Have you seen the schematic? It has no resistors in line with the LEDs so it over loads the output pins of the processor.