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by blippy
Thu Sep 20, 2018 7:26 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: I2C misreads of ATTiny85 slave
Replies: 1
Views: 95

Re: I2C misreads of ATTiny85 slave

OK. So I did a little tweak to config.txt to set the baudrate to 400000. This seems to fix the problem. The program reports numbers from 0...255, with no strange numbers cropping up. So, what's the conclusion? That the I2C was reading slower than the ATTiny85 was sending out signals, thereby causing...
by blippy
Thu Sep 20, 2018 6:39 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: I2C misreads of ATTiny85 slave
Replies: 1
Views: 95

I2C misreads of ATTiny85 slave

I'm fairly new to all this, so please try to keep things within my realm of understanding. I have set up an ATTiny85 (at 8MHz) as a slave. All it does is increment a counter each time it is called, and writes the counter out again. Here is the code: // Code for the ATtiny85 #define I2C_SLAVE_ADDRESS...
by blippy
Fri Mar 16, 2018 12:32 pm
Forum: Mathematica
Topic: Portfolio
Replies: 2
Views: 3092

Re: Portfolio

Yes I would be interested. What stockmarkets can it download from? I am new to Mathematica, so I can give very little in the way of advice. It uses Mathematica's Financial Entity, so I assume that its coverage is extensive. Yahoo Finance is effectively defunct, but Mathematica still works. It's not...
by blippy
Sat Feb 17, 2018 1:39 pm
Forum: Off topic discussion
Topic: How comes on a PI bluetooth works with my Micosoft Bluetooth Notebook Mouse 3000 but not with a Linux PC?
Replies: 1
Views: 666

How comes on a PI bluetooth works with my Micosoft Bluetooth Notebook Mouse 3000 but not with a Linux PC?

I have a Micosoft Bluetooth Notebook Mouse 3000, which works fine under Raspbian. However, i cannot connect it to my Ubuntu (or even Arch) vivoPC (Intel). Why? I would have thought it would have Just Worked (TM). The PC does have bluetooth, as evidenced by typing "rfkill list": 0: hci0: Bluetooth So...
by blippy
Fri Feb 16, 2018 7:36 pm
Forum: Beginners
Topic: Confused about voltages
Replies: 5
Views: 484

Confused about voltages

Am I right in thinking that all the GPIO pins are 3.3V tolerant, but not 5V tolerant? If so, isn't the 5V GPIO inviting a lot of trouble? For example, the blinkt uses the 5V pin. How comes it doesn't cause damage to the other pins that it uses for SPI communication? Does the blinkt have a built-in v...
by blippy
Tue Jan 16, 2018 7:18 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: ATTiny85 and Arduino IDE
Replies: 1
Views: 573

ATTiny85 and Arduino IDE

I saw a video on YouTube about programming ATTiny85 chips (or, indeed Atmel chips in general, including the Arduino]s chip) using avr-gcc and avrdude on a Pi. Another popular way of programming ATTiny85 chips is to use an Arduino and its IDE as an ISP. The Arduino IDE seems more capable than avr-gcc...
by blippy
Tue Dec 05, 2017 11:29 am
Forum: Bare metal, Assembly language
Topic: Ultibo core a bare metal environment for Raspberry Pi
Replies: 65
Views: 17891

Re: Ultibo core a bare metal environment for Raspberry Pi

While we understand the comparison with the simplicity of the 80's, our real aim is to create a 21st century platform that allows people to get creative without the necessity to start from scratch or to wrestle with the one size fits all approach of modern operating systems. I was reading an articl...
by blippy
Sun Dec 03, 2017 10:33 am
Forum: Bare metal, Assembly language
Topic: Ultibo core a bare metal environment for Raspberry Pi
Replies: 65
Views: 17891

Re: Ultibo core a bare metal environment for Raspberry Pi

Thanks for the heads-up on the Linux install. I wasn't aware of that. I am trying to transition away from Windows, so that's the kind of thing I'm looking for. I have in mind a couple of projects: * an accounts package. I already have written my own for Linux, a very simple affair. It would be inter...
by blippy
Sat Dec 02, 2017 10:21 pm
Forum: Bare metal, Assembly language
Topic: Ultibo core a bare metal environment for Raspberry Pi
Replies: 65
Views: 17891

Re: Ultibo core a bare metal environment for Raspberry Pi

Just came across this project today. Very interesting! This is probably the closest we're going to get to the feel of 80's computing. I managed to get a small program working. The feeling of control and low-level simplicity is appealing. I used the version for Windows, but I would like to get it wor...
by blippy
Sat Nov 18, 2017 3:15 pm
Forum: Other projects
Topic: Project idea for the CamJam EdiKit 1
Replies: 0
Views: 209

Project idea for the CamJam EdiKit 1

I bought a CamJam Edukit 1 recently as an intro to electronics using the RPi. I decided to create my own little project out of it. The idea is that you can toggle through the LEDs, and set a function to each LED. If you hold down a "long press", you activate the functionality that you associated wit...
by blippy
Tue Nov 14, 2017 10:43 am
Forum: General programming discussion
Topic: How do I smaple the volume?
Replies: 2
Views: 527

Re: How do I smaple the volume?

Thanks. Yes, that looks like the kind of thing I'm looking for.
by blippy
Mon Nov 13, 2017 7:08 pm
Forum: General programming discussion
Topic: How do I smaple the volume?
Replies: 2
Views: 527

How do I smaple the volume?

Suppose I want to sample the output volume of HDMI audio, e.g. 10 times a second. How do I do it?
by blippy
Fri Nov 03, 2017 3:14 pm
Forum: Mathematica
Topic: Portfolio
Replies: 2
Views: 3092

Portfolio

Yahoo Finance had a good service that allowed you to download share prices. Unfortunately, it seems to have been acting up lately, and is going the way of all things Yahoo, namely downhill. The good news is that Mathematica can download share prices. If anyone is interested in learning how Mathemati...

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