MSPM0G3519: MSPM03519 I2C Repeated Start (DL_I2C_startControllerTransferAdvanced)

Jishnu P

Part Number: MSPM0G3519

Tool/software:

Hi team,

I am facing an issue while developing code for the I2C repeated start method. I am unable to send and receive data continuously. i am using 2 MSPM0G3519 launchpads and what I observed was the SCL line went low and never returned to high. I took your example code for usage of DL_I2C_startControllerTransferAdvanced and attached the link from where I downloaded the code link.

3 months ago

0 Bruce McKenney 3 months ago

Guru 99225 points

1) If what you're trying to do is Write followed by Read ("register model" Slave), consider using RD_ON_TXEMPTY instead (much simpler). See also:

https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1500216/mspm0g3507-how-to-control-sending-out-the-restart-in-i2c-communication/5763329

2) If not: What code is running on the Slave side?

0 Pengfei Xie 2 months ago

TI__Expert 8485 points

Thanks Bruce.

Hi Jishnu,

Have your problem solved with Bruce's guidance about I2C repeated start?

You could also see 20.2.4.1.3 Read On TX Empty of MSPM0 G-Series 80-MHz Microcontrollers Technical Reference Manual (Rev. B) for more details about "write-repeated start-read" sequence.

Arm-based microcontrollers

Arm-based microcontrollers forum

MSPM0G3519: MSPM03519 I2C Repeated Start (DL_I2C_startControllerTransferAdvanced)