Comments on: I²C Communication with PIC Microcontroller – MPLAB XC8

By: atul redekar

atul redekar — Mon, 31 Aug 2020 05:51:36 +0000

Thank you so much works perfectly

By: Ligo George

Ligo George — Wed, 05 Aug 2020 05:18:19 +0000

In reply to derlo.

Firstly above example uses PIC 16F877A while 16F877 is a different microcontroller and above code is tested too.
This tutorial is intended for beginners/students who are new to these.

If you want more efficient code for your project you should utilize interrupts for that. That was not in the scope of above tutorial.

By: derlo

derlo — Tue, 04 Aug 2020 10:05:17 +0000

In reply to Ligo George.

Pity that this code is not utilizing the power of a true hardware I2C MASTER mode; when working it is the most efficient way to implement I2C; instead it waits for each state to complete; very inefficient; Also PIC16F877 is obsolete now; would be nice to see a newer PIC micro with full I2C MASTER mode ; I am working on it right now but it does not work properly – that’s the reason I came across this page – searching for hints re what I might be doing wrong

By: Jimmy

Jimmy — Thu, 02 Apr 2020 23:12:29 +0000

In reply to Ligo George. I look at the same. Send more variable to the Slave

By: Ligo George

Ligo George — Thu, 02 Apr 2020 03:57:14 +0000

In reply to Devang Lad. You can understand and make necessary changes to the above program.

By: Devang Lad

Devang Lad — Tue, 31 Mar 2020 11:52:40 +0000

If i want to send more than one variable from master to slave and save them on diffrent variable on slave
how i can do it.

By: Ligo George

Ligo George — Sun, 16 Feb 2020 06:42:33 +0000

In reply to Mazzarolo, Moises Antonio.

? is conditional operator in C
(condition)?true part;false part
same as if(condition) {true part;} else {false part};

By: Hatem

Hatem — Tue, 03 Dec 2019 00:03:53 +0000

Great job !! otherwise i am still surprised that it’s working for you.
+ slave should release SCL stretch by setting CKP flag at data reception in this case => SSPSTAT.D/A = true. //data
+ also in this case if(!SSPSTATbits.D_nA && !SSPSTATbits.R_nW) after address+write byte reception (0x30), if SCL is kept stretched by slave, master won’t be able to set clock again.

NB:
SSPCON.CKP flag In I2C Slave mode:
SCK release control
1 = Enable clock
0 = Holds clock low (clock stretch). (Used to ensure data setup time.)

By: Mazzarolo, Moises Antonio

Mazzarolo, Moises Antonio — Sat, 16 Nov 2019 01:51:24 +0000

Hello, I am studying the RTC code and did not understand what it means (a)? 0: 1;
Can someone explain me?

By: Robert

Robert — Fri, 27 Sep 2019 19:08:50 +0000

Thanks. Work fine!!