BASIC SC16IS752 C software needed

[dfansler]

Hello - I am trying to set up a SC16IS752 to received data on channel A in a polled environment using I2C.  I have looked thru many examples posted online, but most all seem to be full blown do everything the chip can do examples.  Far more complicated than I need.  Can anyone point me to a simple how to read data coming in on channel A in a polled I2C environment?

As I have it, the code I have setup does write to the IC without error - but the chip does not do anything.  BTW, using i2cdetect -y 1, the i2c address of the chip is 0x4d.

Many thanks to all who read and especially those who respond . . . 

David

David V. Fansler
Solo sailed Atlantic 2022
YouTube "Sailing Solo at 70"

[dfansler]

Thanks for your response.  The processor is a Raspberry Pi 4, running the Bookworm OS.  The Pi has a UART, but the changes made in Bookworm have killed a lot of the I/O and no one seems to be able to find a complete fix.  I need to read data from a GPS for this project.  With the Pi's UART being difficult to program, I found the SC16IS752 on Amazon,, with a 1.8432MHx Crystaloo a small board.  I used double sided tape to mount the small board on my HAT for the Pi.

SC16IS752             To HAT
SCL                        Pi SCL
SDA                        Pi SDA
Vin                         +5v\
Gnd                      pi Gnd
I2C/nSPI               Pi Gnd
A0                         Pi Gnd
A1                          Pi Gnd
nIRQ                     not connected
RxA                       GPS serial out

I looked at the bare bones code previously, but will look again.

Thanks again

David

[ErikaC]

Hello,

Would it be possible for you to share your schematic and setup details? What is the microcontroller you're using?

For reference, please take a look at this example project:
SC16IS752 Bare-metal Example Project