Software I2C

[thomas]

Hi,

I know the PIC only has one hardware I2C port. If I use software I2C, can I have more than one I2C ports on a single micro? Thanks!
Thomas
___________________________
This message was ported from CCS's old forum
Original Post ID: 144516011

[jds-pic]

yes, you can use multiple i2c, one could be hardware and the rest software-synthesized. however, you have to explicitly code your functions using the #use i2c directives. there is no runtime selection of which i2c port to use.

so you MUST code as follows:

#use i2c(config 1)
my_function_1() {
i2c_start();
...
}

#use i2c(config 2)
my_function_2() {
i2c_start();
...
}

you MUST NOT code as follows:

if (someval=TRUE) {
#use i2c(config 1)
i2c_start();
...
}
else {
#use i2c(config 2)
i2c_start();
...
}
}

good luck,
jim aka jds-pic


:=Hi,
:=
:=I know the PIC only has one hardware I2C port. If I use software I2C, can I have more than one I2C ports on a single micro? Thanks!
:=Thomas
___________________________
This message was ported from CCS's old forum
Original Post ID: 144516012

[thomas]

Thank you very much for your help!
Best wishes and regards,
Thomas
:=
:=yes, you can use multiple i2c, one could be hardware and the rest software-synthesized. however, you have to explicitly code your functions using the #use i2c directives. there is no runtime selection of which i2c port to use.
:=
:=so you MUST code as follows:
:=
:=#use i2c(config 1)
:=my_function_1() {
:=i2c_start();
:=...
:=}
:=
:=#use i2c(config 2)
:=my_function_2() {
:=i2c_start();
:=...
:=}
:=
:=you MUST NOT code as follows:
:=
:=if (someval=TRUE) {
:= #use i2c(config 1)
:= i2c_start();
:= ...
:= }
:=else {
:= #use i2c(config 2)
:= i2c_start();
:= ...
:= }
:=}
:=
:=good luck,
:=jim aka jds-pic
:=
:=
:=:=Hi,
:=:=
:=:=I know the PIC only has one hardware I2C port. If I use software I2C, can I have more than one I2C ports on a single micro? Thanks!
:=:=Thomas
___________________________
This message was ported from CCS's old forum
Original Post ID: 144516013

[Mark]

FYI:
In case you didn't know this, multiple i2c devices can be on the same bus.

Regards
Mark

:=Hi,
:=
:=I know the PIC only has one hardware I2C port. If I use software I2C, can I have more than one I2C ports on a single micro? Thanks!
:=Thomas
___________________________
This message was ported from CCS's old forum
Original Post ID: 144516016