TMS320F28035: Reading SCL and SDA pin

Part Number: TMS320F28035

My question is related to the I2C peripheral. If I assign GPIO32 and GPIO33 as SDA and SCL respectively… Can I still read the digital state of the pin using Gpio Data Register?

Example:

SDA_Pin = GpioDataRegs.GPADAT.bit.GPIO32

SCL_Pin = GpioDataRegs.GPADAT.bit.GPIO33

Basically I want to implement a reset-routine for the I2C. This routine will continuously check if SDA or SCL is stuck-low (more than 50-100ms). If this happens, I will assume that the I2C is stuck for whatever reason and then I will force a reset of the I2C peripheral and also my SW state-machines.

Regards, Bernd

over 7 years ago

0 David M. Alter over 7 years ago

TI__Guru 61235 points

Bernd,

Yes, you can still read the pin status using GPxDAT when the pin is configured as a peripheral function. This is depicted in the TRM sprufb0d, Figure 40, where you can see that the GPxDAT register for read is tapped off the signal BEFORE the peripheral choice mux.

Bests Regards,

David

0 BO over 7 years ago in reply to David M. Alter

TI__Genius 12760 points

Hi David,

thank you for the fast reply.

Correction for others looking at this post : "This is depicted in the TRM sprugl8c www.ti.com/lit/SPRUGL8 , Figure 45, where .... "

Best regards,

Bernd

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F28035: Reading SCL and SDA pin