Other NXP ProductsのトピックBASIC SC16IS752 C software needed

BASIC SC16IS752 C software needed

dfansler — Tue, 26 Aug 2025 20:41:17 GMT

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"

Re: BASIC SC16IS752 C software needed

ErikaC — Wed, 27 Aug 2025 15:53:40 GMT

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

Re: BASIC SC16IS752 C software needed

dfansler — Wed, 27 Aug 2025 17:08:12 GMT

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