PIC16F18877 RTC-Read from DS1307

[Microwitsch]

Hello everyone,

The DS1307 sends no Ack for writing the Chipadress 0xD0?
What's wrong with this simple project? I'm a beginner, sorry...

build with Mplab XC8 v2.31

[Ettore]

Hi
I found a couple of bugs in that PIC16 family VSM model which we'll fix as soon as possible.

I attach a version of your code that I have modified to work as expected. Substantially I've improved your I2C code to make it more reliable and made a workaround because of simulated PIC16 bugs. I recommend not to use the external interrupt INT on RB0 (or other pins as well) as for some reason it won't work. Please use the IOC interrupt instead. I can PM you with a version that uses IOC interrupts if you don't know how to.

16F18877simpI2Cread_1.pdsprj

(33.26 KiB) Downloaded 8 times

[Microwitsch]

Hello Ettore,

Thanks for the quick answer! I'll take a look at your attachment.
I found a few errors in my program.

I had reached the wrong value for "SSP1ADD", which is now a value of 0x13 at an instruction frequency of 8Mhz. And the oscillator registers also had incorrect values , which I have now adjusted. But no success, I suspected a frequency setting error. In the meantime, I found another, simple example which I am attaching here. What influence does the frequency that you can see for the PIC as shown in the screenshot actually have? independently sets?Which one is validin the simulation?

proteussim.png

I found a simpler example (smaller controller) on the site here and analyzed it as best I could in order to adapt it for the PiC16f18877. The PIC is very extensive with the registers (900pages documentation) but it seemed good to me to respond to a universal one.https://embetronicx.com/tutorials/micro ... -tutorial/

PIC16I2DsimpleLCDeepromDemo.pdsprj

[Microwitsch]

Hi
I found a couple of bugs in that PIC16 family VSM model which we'll fix as soon as possible.

I attach a version of your code that I have modified to work as expected. Substantially I've improved your I2C code to make it more reliable and made a workaround because of simulated PIC16 bugs. I recommend not to use the external interrupt INT on RB0 (or other pins as well) as for some reason it won't work. Please use the IOC interrupt instead. I can PM you with a version that uses IOC interrupts if you don't know how to.

16F18877simpI2Cread_1.pdsprj

Thanks Ettore, that looks much better!...ok, I'll take a look at it then.

[Ettore]

The bugs about the default PPS I2C output pins settings and external interrupt INT to RB0 have been now fixed.
The fix will be in the next service pack.