inglewoodpete
Senior Member
Yes, my project successfully uses HSerial and Hi2c (as an i2c master) on a 28x1/40x1.
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YEY! 18M2 comming soon.
- Thread starter boriz
- Start date
Thanks for the encouragement.
I was trying to communicate between 40x2's using i2c and for debugging purposes was using hserial out to report status in the i2c slave. The I2c input messages were often blocked (timed out??) until I stopped the hserial out and then they worked fine.
I ASS-U-MEd that it would also be a problem in the master as well and stopped further development efforts. I would have had no trouble if the master could control communication in both directions.
Can you confirm that the i2c master can be in the middle of an i2c communication and receive an unsolicited hserial input without corrupting either one?
I was trying to communicate between 40x2's using i2c and for debugging purposes was using hserial out to report status in the i2c slave. The I2c input messages were often blocked (timed out??) until I stopped the hserial out and then they worked fine.
I ASS-U-MEd that it would also be a problem in the master as well and stopped further development efforts. I would have had no trouble if the master could control communication in both directions.
Can you confirm that the i2c master can be in the middle of an i2c communication and receive an unsolicited hserial input without corrupting either one?
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I've just revamped my infamous "gang of 16" PICAXE table (below) to include the new 18M2, & have attached a updated draft below. This is intended not so much a last word statement but as just a handy brag/comparison table to show PICAXE family features. Heaps of folks think there are only just a couple of variants of course.
Can anyone spot blunders & tweaks that need to be made? In particular I've had to read between the lines & "guess" 18M2 features & Aust$ price. TIA - Stan
Can anyone spot blunders & tweaks that need to be made? In particular I've had to read between the lines & "guess" 18M2 features & Aust$ price. TIA - Stan
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hippy
Ex-Staff (retired)
Not off-hand though I would have expected it to work, though I could be wrong.
inglewoodpete
Senior Member
This really should be in a separate thread, since it has nothing to do with the 18M2.
I'm using a 28x1 F/W A.6 as an i2c master, so no scratchpad used there. The master reads the scratchpad of its slaves (all 28x1 A.6 if it matters). The hSerial uses the scratchpad, since the protocol does not have a native master/slave arrangement: incoming serial can potentially arrive at any time.
Peter
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slimplynth
Senior Member
was putting together an IR transmitter (using a 14M) for my bot at the weekend. just using numbers 1 to 7 on the laptop to control direction.. sertxd, inputting in the terminal, the terminal also reporting back with Serrxd the command issued.
Was genuinely stumped for a few minutes when the PE refused to accept my program due to size..thought i'd killed another picaxe but the penny dropped and realised I'd become acustomed to the the extra breathing space the X2 allows for programs
lookin foward to the 18M2 any chance of an 08M2 too.. awww pretty please. Bigger program size, Touch function... should be reading up on capacitive sensing...
Was genuinely stumped for a few minutes when the PE refused to accept my program due to size..thought i'd killed another picaxe but the penny dropped and realised I'd become acustomed to the the extra breathing space the X2 allows for programs
lookin foward to the 18M2 any chance of an 08M2 too.. awww pretty please. Bigger program size, Touch function... should be reading up on capacitive sensing...
Andrew Cowan
Senior Member
I feel happy - it shows Microchip are releasing more and more powerful chips - meaning projects can get better and more sophisticated. Can't wait for the 08X2!
A
A
Chavaquiah
Senior Member
The last batch of MCUs I bought are more powerful than my first computer and cost 50 times less (200x with inflation). I did never regret getting that ZX Spectrum...
...yes this is long overdue. Even if it doesn't have many more features, more program memory would revitalise this product, but it is in the hands of Microchip.
Texy
hippy
Ex-Staff (retired)
For me that falls into the same category as buying a 20MHz 80286 PC with 8MB Ram and a 10MB hard disk for around £1K and now having a 2GHz multi-core with 4GB Ram and 320GB disk on my desk which cost a tenth of that.
It's natural evolution of product that things usually get better and cheaper. You either buy and accept that, or wait until something with the right spec and right price comes along. Perhaps the best way to judge things is; was it a fair price at the time ?
I'm having a clear-out at home and will probably have land-filled tens of thousands of pounds worth of kit in old money which has absolutely zero value today.
slimplynth
Senior Member
As hippy said plus; surely it's simple supply an demand.. at the time (the now lower spec chips) would have been greatly welcomed as a new/exciting products. If these weren't bought with hard cash then money would not have been directed towards making better X2 chips to replace them.
Don't bet on it. The PIC12Fxxx line usually does not have self-write capability for the program flash memory, so bootloaders are restricted to write data into the (small) data EEPROM. If you program the PIC12683 directly (compiled Basic or C, burned with a programmer) it can actually already hold pretty sizable programs - which means Microchip doesn't have a large incentive to put out something bigger in that package. It's a pretty easy-to-use chip (few peripherals or advanced options) so a good device to get started with if you want to go beyond Picaxe.
Some info about the 18M2
--------------
Here is some specs on the 18M2 do out in July 2010
It will also replace ALL of the 18xxx chip's
http://elecurls.tripod.com/picaxe-sum.htm
-teddy
--------------
Here is some specs on the 18M2 do out in July 2010
It will also replace ALL of the 18xxx chip's
http://elecurls.tripod.com/picaxe-sum.htm
-teddy
westaust55
Moderator
@teddy,
Ya gotta keep up man!
Post 5 gave the Rev Ed flyer will lots of information
Post 64 gave the July 2010 date.
The data at the link you gave is missing a lot of data and has some errors.
40X1 is 5V rated not 3V (but can work down to 2V at 4/8MHz).
X1 and X2 parts Absolute Maximum current capabilities are:
Total for chip == 95mA
Total ofr all ports is 90mA
Max for one IO = 25mA
Statement made is:
“* = DO NOT leave Input PINS "floating". Use a 4.7k Resistor to Terminate to Ground, or pull them High with a 4.7k Resistor to VDC+”
It is not mandatory to tie unused inputs to ground or Vcc but there may be circumstances where doing so may help with things such as reduced power consumption, etc.
Statement made is:
“** = If Serin or Serout are NOT being used, Terminate them with a 100k Resistor to Ground”
Yes the SERIN line must be pulled to ground – recommended is 10 kOhm but 100k should do.
Absolutely no need to pull SEROUT line to ground.
But keep up the work and complete/correct your table and it will be useful
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Keeping up.
Thanks, Westaus! I have updated the chart with the info U gave me.
As far as keeping up, I'm do'in my best.
Thanks, Westaus! I have updated the chart with the info U gave me.
As far as keeping up, I'm do'in my best.
No. I mean shorten the package itself. Using a saw or Dremel. The actual integrated circuit die is much smaller than the package. Usually occupying the very centre, most of the package is just lead-out’s to the pins. See: http://en.wikipedia.org/wiki/File:153056995_5ef8b01016_o.jpg
So, in theory, you can modify a standard DIP Picaxe to be much smaller, though it won’t be easy and your soldering skills need to be up to scratch.
Note. I cannot take full credit for this idea. Someone else posted a similar suggestion on this forum some months ago regarding chopping off part of the package carrying unused pins.
So, in theory, you can modify a standard DIP Picaxe to be much smaller, though it won’t be easy and your soldering skills need to be up to scratch.
Note. I cannot take full credit for this idea. Someone else posted a similar suggestion on this forum some months ago regarding chopping off part of the package carrying unused pins.
That's what I've already done, replacing bulky non-microcontroller components that would have been there (doing signal processing which a PICAXE is too slow for) with a PIC12F683. The Programming editor's assembler templates make it quite easy to program these with short programs in fast-repetitive short-arithmetic applications like a square wave shifter for example. The PIC12F683 with a CCP makes it the most versatile 8-pin PIC. I run it at 20MHz in my application.
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18M2
My understanding is that it will do any of the functions of any of the 18/18x/18x1/18x2 will do. Plus some new commands will be added. Which means an update to the PICAXE Manuals, and Program Editor.
-teddy7
PS: If I'm wrong, I'm sure Westy or Hippy will be all over me!
My understanding is that it will do any of the functions of any of the 18/18x/18x1/18x2 will do. Plus some new commands will be added. Which means an update to the PICAXE Manuals, and Program Editor.
-teddy7
PS: If I'm wrong, I'm sure Westy or Hippy will be all over me!
You called??
MPep.
hippy
Ex-Staff (retired)
The 18M2 supersedes the 18/18A/18M/18X so consolidates their functions, gives a bit more ( notably multi-tasking ), and also brings things into line with the principles of the X2's. It's an evolution of the 18-pin parts rather than a porting of X2 to 18-pin so not all commands and capabilities of the X2 are supported.
Yes, manuals and software will be updated to support the 18M2.