Matrix user forums

Whilst I am obviously not S or B the following should still work

RS232_IN from RS Component

String = String + RS232_IN in string Icon

Seems to work well.

Hi, The I2C BoostC commands appear to be as follows : void i2c_START(void) // Generates the I2C Bus Start Condition void i2c_RESTART(void) // Generates the I2C Bus Restart Condition void i2c_STOP(void) // Generates the I2C Bus Stop Condition unsigned char i2c_WRITE(unsigned char i2c_data) // Generat...

Hi, What is the current timescale on the I2C component? The I2C commands in Boost-C do not seem clearly documented, you almost need to be good at C and know the protocol well to figure out what all the documentation means. If the component is a while off I will post on the C Forum and ask what the c...

Once again thanks Guys.

Both methods work fine. I was looking for the Char$ command but failed to spot it as it is only in a list in the help file rather than as an illustrated example along with the other functions.

best regards,

Mark

I want to send a String variable via the RS232 Component, Sending "Hello" as a predefined string works OK, but trying to send the variable String where string = "Hello" is not accepted by the component. I can hive off individiual characters from the string using characterstring = mid$(string,X,1) an...

This topic has been gone through in detail in the E-Blocks forum, dated 7 January 2007 ('Flying leads').

There are issues that arise from having MCLR pull ups on both the PCB and the programmer board and the technique can give rise to some obscure problems, so proceed with caution.

Mark

Hi, I do not know your board, but since you are using Flowcode and Hyperterminal then you should have a reliable starting point. I suggest 1) set up a loop in Flowcode continously sending an ASCII character every 100ms. 2) Open hyperterminal with the correct board rate, parity etc. Watch for input. ...

Hi Steve,

Count me in.

Mark

Steve,

Yes please do. I was looking at the chip for precisely this reason but decided not to as the I2C component could be an alternative, however, one chip rather than two is my preference.

Mark

Eddie, Sorry it is not clear to me if you are using the LCD E-block. If you are not then a problem can be that the contrast setting for the LCD may need adjusting. It is possible for an LCD to be working perfectly well but you see nothing unless contrast is correct, do this by using a potentiometer ...

Guinea pig at the ready.

Steve, I am keen to get going with the 16F886 and I'm sure others may also be. However, without PPP support it will be hard to tell if any issues arise because of the 3rd party programmer/board or from Flowcode. but we have not fully tested them because we don't have any samples yet. I now have some...

Hi Steve/Benj, I have been having a problem with the EEROM component not writing and when reading echoing back the address as the data read. I have tried a test programme and shown that the component/chip/circuit does work and the programme which has the problem worked fine until recent revisions (n...

Steve, A great selection of boards. My interest is mainly in using a board to prove a concept, so the clearer the documentation can be made the better, as the ideal will simply be to transpose an E-board circuit and component(s) to a prototype board for further development. On this score an I2C boar...

Billm, All seems stange to me. However, self erasure of memory should not normally be possible, particularly if you are not using low voltage programming or any special on chip self programming code. I suggest you check the clock circuit, put an oscilloscope or frequency meter (such as on a multimet...

As Benj says calculating parity needs some though. However, the method is directed to binary math and not decimal math. Hence, when, translated into binary manipulation the whole thing is more simple. Hence, try this link : http://www.piclist.com/techref/microchip/math/bit/parity.htm Hope this helps...

gharryh I would personally consider this as a math problem rather than a Flowcode capability issue. You generate a number *36 and divide it by a number *1000. It makes more sense to combine these constants into a single divide by 28. This should then sit nicely within the +/- 32000 that Flowcode pro...

Hi Pinto, Whilst the PIC chips can be used to generate parity bits Flowcode does not. Flowcode outputs a start bit, an 8 bit value and a stop bit, but for reception purposes one or two stop bits make little difference. If you need parity then you will need to generate a C-code routine to calculate t...

Eddie,

You need two delays.

In your loop you have the LED out for about 10us or 0.00001 seconds, and on for 1 second.

Start
|
While 1
Output Port B 1
delay 1 sec
Output Port B 0
delay 1 sec <---------------
EndWhile
|
End

Go with the Flow, why try and buck the trend of a whole industry and work with a niche processor? Pick a PIC.

Yes, Ben's approach is neater. Another variation would be to count clock inputs on Timer 1 input pin and use Timer 0 to interrupt and read Timer 1 and reset it. That way the programme would get a direct count of clock cycles per time interval, correctly selecting Timer 0 may even give a direct readi...

Pinto, There is not enough information for me to help much. However, bear in mind that RS232 comms are not instantaneous, particularly if they are waiting for a handshake routine (is there hardware handshaking used?). Also 1:128 with a low speed clock could itself give a low send rate (though 1Hz is...

Hi Benj,

I had in the back of my mind that the 'command' option in the LCD macro's list was for doing this sort of thing?

Mark

You may be able to do this by polling a single input pin. Check the pin (while pin is low) and when it changes start a counter, ([while pin is high] holding [count = count + 1]) How far the counter has got for a single high cycle (for a 1:1 duty cycle signal) will be a measure of its frequency. (use...

Another aspect of the point you make is that it would be useful to use port pins for two different electrical functions, initial switch input and then for something else later. One way is to use one port pin as the '5v' or Vcc to the switches (single throw only) by setting as a 'high' output for one...