Trying to inch my way to the finish line w/ a 16F1829.........

[EarlyBird2]

One difference is that Hardware USART requires an RS-232 driver but software does not. Also with software the pins are not fixed. Just need to take this into account when deciding which to use. Obviously if there is no RS-232 driver available then Hardware USART can not be used. I wonder if this is why he could not get HSERIN to work, could explain the gibberish he got.

[Demon]

Might be on to something. I forgot I use a MAX232 in my setup.

PC side uses more than 5V (12V I think), good thing a PIC can take a beating.

Robert

[thasatelliteguy]

Might be on to something. I forgot I use a MAX232 in my setup.

PC side uses more than 5V (12V I think), good thing a PIC can take a beating.

Robert

Jury's still out on the beating... I toast them at regular intervals doing far less nefarious acts to them.... However, they are, on whole, much cheaper to replace than arduino boards.

As far as the 12v tho, this 16f1829 chip I'm using now has been a hoss so far. And it started life as a PICAXE20M2. So when I first flashed it, it was with a home-made serial cable with no MAX232 or anything. Just straight out the serial port to the chip, so I think some chips will handle it better than most think...

[EarlyBird2]

Jury's still out on the beating... I toast them at regular intervals doing far less nefarious acts to them.... However, they are, on whole, much cheaper to replace than arduino boards.

As far as the 12v tho, this 16f1829 chip I'm using now has been a hoss so far. And it started life as a PICAXE20M2. So when I first flashed it, it was with a home-made serial cable with no MAX232 or anything. Just straight out the serial port to the chip, so I think some chips will handle it better than most think...

Have you a MAX232 connected to the Hardware USART pins?

[HenrikOlsson]

Hi,

Can I use EUSART over BT HC-05? I would assume not since one is UART and one is EUSART...

If SEROUT works with the HC-05 then HSEROUT will - as long as you get the polarity and baudrate correct. USART vs EUSART is just a matter of the features available they both do asyncronous serial and they both work with HSERIN/HSEROUT.

1. I cant use DT's interrupts without corrupting my serin/serout. And I have to assume it'll corrupt hserin/hserout as well.

That's correct and it's just the nature of the beast basically. It's not a problem, issue or bug, it's just the way the microcontroller works. If it's sitting in a tight software timed loop (which SERIN is) and an interrupt forces it to go and do something else the timing of that tight software loop is thrown off - nothing you can do about that.

2. I can't use ON INTERRUPT cuz it'll miss pulses during even the shortest waits. This is even worse than #1 since the machine will be lost.

That's also correct due to the reasons described earlier.

One difference is that Hardware USART requires an RS-232 driver...

Well, that depends..... For cabled connection to a PC it's a good idea to use a RS232 tranceiver for several reasons. Normally, the polarity of the USART output on the PIC is inverted in respect to what the PC expects. A typical RS232 tranceivers does two things. It "boosts" the signal voltage leverl so it falls within the specs for a proper RS232 connection and it inverts the signal so the PC can read it correctly.

Now, since we're talking about a Bluetooth connection here and it does work with SEROUT I probably wouldn't want to put a MAX232 between the PIC and the bluetooth module since it's most likely designed to operate at TTL levels. However, and as has been pointed out before, you need to watch the polarity and make it match whatever you're using with SEROUT. Either invert in in the PIC (if it's got that option) or use an external inverter between the PIC and the Bluetooth module.

Take a step back, write a small test program just for the HSEROUT/HSERIN part and get that working.

/Henrik.

[Demon]

One difference is that Hardware USART requires an RS-232 driver...

Look what I found.

http://www.picbasic.co.uk/forum/show...2591#post82591

Robert