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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

Legal Stuff (in no particular order)
Knowing our Customers

In order for us to keep accurate records of who we have exchanged information with, regardless of whether a supply of goods or services takes place, we require certain information from you, before we enter into discussion or execute a financial transaction. ...

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Quality
Our aim is to deliver the highest possible quality products and services.

It is our intention to meet or exceed our customers' expectations, always.

Our Quality Management System is based upon a policy of continual improvement.

We operate quality processes that meet, as a minimum, the requirements of ISO 9001-2000 and the processes are continually monitored for effectiveness.

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Terms and Conditions of Sale

Our standard terms are conditions are available here in adobe acrobat format. If you do not have acrobat reader, you can ...

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RoHS Statement

Crownhill Associates operates a quality system compliant with ISO9001:2000 covering all aspects of its operations. Crownhill are also able to manufacture products with full component level traceability where required by its clients. Our quality system and documentation are open to review by our clients at our discretion. ...

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Privicay Policy

Data Protection / Privacy Policy
We are committed to protecting your privacy, and we will only use the information that we collect about you lawfully (in accordance with the Data Protection Act 1998). ...

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Environment and WEEE

Our contribution (WEEE)
Through our efforts we are contributing to the re-use, recycling and other forms of recovery of WEEE under thes regulations.

If you have purchased from us, something that could be described as 'E.E.E.'('Electrical and Electronic Equipment') , then when you dispose of it, it becomes 'W.E.E.E.' (the 'W' stands for 'waste') and it therefore needs to be disposed of correctly. You may do this yourself, but if you'd rather not, then contact us, we will dispose of it for you, in the correct way. Which we will do, and we won't charge you for it.
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