RTOS/CC3220SF-LAUNCHXL: How to use the hardware I2C of cc3220 chip to produce SCL continuously

Xiaoqiao Hu

Part Number: CC3220SF-LAUNCHXL
Other Parts Discussed in Thread: CC3220SF, ADS7142

Tool/software: TI-RTOS

I use CC3220SF chip and ADS7142 chip , and connecting 3220's I2C and ADS7142' I2C together. I need to use the continuous sample mode of ADC, but the datasheet of ADS7142 says that it need the MCU to provide continuous SCL to ADS7142 chip; but how can CC3220 chip generate continuous SCL signal? It seems that this function has not been provided. Could you give me some help ? Thank you very much!

over 6 years ago

0 Vincent Rodriguez over 6 years ago

TI__Mastermind 28285 points

Xiaoqiao,

Have you tried to have a loop of constant recieving, and just throw away data you don't want? This should keep the SCL constant for you.

Regards,

Vince

0 Xiaoqiao Hu over 6 years ago in reply to Vincent Rodriguez

Prodigy 160 points

Hi Vincent Rodriguez,
Thank you for answer! I can do this by tring to have a loop of constant recieving, but it will consume more mcu's time, so I need to do this by using hardware's function to produce successive scl clock not using software method , and I don't know whether the chip support this , thank you very much!

0 Vincent Rodriguez over 6 years ago in reply to Xiaoqiao Hu

TI__Mastermind 28285 points

Xiaoqiao,

You would only need to service this after your burst finishes, which shouldn't have a lot of effect on the MCU loading. We don't offer a feature like you are referring to. You could maybe try generating a PWM signal on a pin to satisfy that requirement, but I don't think that is the implementation you are looking for.

Regards,

Vince

0 Vincent Rodriguez over 6 years ago in reply to Vincent Rodriguez

TI__Mastermind 28285 points

Xiaoqiao, Do you still have questions on this issue?

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RTOS/CC3220SF-LAUNCHXL: How to use the hardware I2C of cc3220 chip to produce SCL continuously