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Recent Forum Posts

Re: My "Library" for ST7920 Graphical displays, works fine, but...

Well, I don't see anything to be slow at 8mhz, except I2C :D
Had no time today, will measure I2C frequency tomorrow and post back....
CuriousOne Yesterday, 20:22

Re: Adding and reading byte variable from the bit array?

The issue is that these boundaries should be changeable, since different chars will have different pixel width.
There are two ways of doing this - all capitals have same width and all non-capital...
CuriousOne Yesterday, 20:10

Re: Adding and reading byte variable from the bit array?

Have you tried something like this?

Myword2.5 = Mybyte1.2 'move bit 2 of Mybyte1 to bit 5 Myword2
Myword2.6 = Mybyte1.3
Myword2.7 = Mybyte1.4
Myword2.8 = Mybyte1.5
mark_s Yesterday, 19:34

Re: Adding and reading byte variable from the bit array?

The best I can think of is shifting & bit masks. If you want to use bits 2 through 5, create a generic temporary variable to put the interim result. Right shift it to put the 1st needed bit at the...
mpgmike Yesterday, 15:46

Re: My "Library" for ST7920 Graphical displays, works fine, but...

If you're running at 8MHz then no wonder everything is slow.

32MHz (or 64MHz for something like an 18F26K22) would definitely be faster, way faster.
The I2C won't necessarily be a lot faster on...
tumbleweed Yesterday, 11:58

Adding and reading byte variable from the bit array?

Hello.
I'm upgrading my ST7920 "library", so letters can have variable width, for better visual appearance.
For this purpose, I plan to have single, screen-wide bit array, in which I will write the...
CuriousOne Yesterday, 07:26

Re: My "Library" for ST7920 Graphical displays, works fine, but...

Not yet, but will do. Measure what, I2C clock frequency?
Tried modifying code in a way, that only that part of screen is redrawn, which is being updated. For some uses it does helps, but not always.
CuriousOne Yesterday, 05:32

Re: My "Library" for ST7920 Graphical displays, works fine, but...

Have you measure what clock speed you're getting?
Standard "high speed" I2C clock is 400kHz, maximum clock speed of a Microchip 24C256 when run at >2.5V is 1MHz.
SPI-interface flash chips usually...
HenrikOlsson Yesterday, 05:29

Re: My "Library" for ST7920 Graphical displays, works fine, but...

Good.
So I have to "learn" to use SPI eeprom 1st, and then use MSSP :)
By the way, if I leave current setup as is - using I2C, but use PIC running at say 32mhz (instead of current 8mhz), will this...
CuriousOne Yesterday, 04:43

Re: My "Library" for ST7920 Graphical displays, works fine, but...

No.
SSPBUF is the Synchronous Serial Port Receive Buffer/Transmit Register. It's the name of register to/from which you write/read whatever gets shifted out.
HenrikOlsson - 17th May 2022, 21:28

Ethernet
Using the Arduino Ethernet shield with AMICUS18 (Part 1)

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HenrikOlsson

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Published on - 21st May 2011 06:10 Number of Views: 9329

Hi,
With this post I hope to spark the interest in what could develop into a joint forum project. The purpose of the ...

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Re: Using the Arduino Ethernet shield with AMICUS18 (Part 2)

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HenrikOlsson

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Published on - 25th May 2011 02:14

Hi,
I don't know what the "best" way to aproach this actually is. I don't think me posting hundreds or thousands of lines of code is going to actually help others that much and I don't think I'll get much out of it either.

Instead I think I'll post snippets and routines, explaining what they do (or at least intend to do) and why. This way I think it's easier to tag along, one step at the time and, which is important, ...

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Re: Using the Arduino Ethernet shield with AMICUS18 (Part3)

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HenrikOlsson

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Published on - 26th May 2011 02:33

Hi,
In todays post I'll try to cover the basic input and output routines I use to communicate with the W5100.
...

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Re: Using the Arduino Ethernet shield with AMICUS18 (Part 4)

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HenrikOlsson

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Published on - 6th June 2011 03:21 Number of Views: 4029

...continued from Part3 ...

In the W5100 there's a total of 8k of RAM reserved for the sockets receive memory ...

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