topic Re: i2c bus busy problem in PowerQUICC Processors

i2c bus busy problem

love_hate_and_repeat — Tue, 17 Dec 2019 17:03:21 GMT

i'm working on t1042 cpu and i didnt solve some problems i encountered.

i firstly send start condition to bus and after that, i dont send anything except stop condition to free bus but

after start condition, if i send stop condition to bus, it doesnt work and bus is always remaining as busy.

code is like follow;

send start condition

send stop condition

exit

Re: i2c bus busy problem

Pavel — Wed, 18 Dec 2019 02:17:46 GMT

See the Section 23.5.3.1 of the T1042 Reference Manual:

The bus is detected to be busy upon the detection of a START condition, and idle upon the detection of a STOP condition.

It looks like that a STOP condition is not detected.

Send STOP condition again.

Try to use command sequence from the Section 23.6.2.3.

Have a great day,
Pavel Chubakov

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Re: i2c bus busy problem

love_hate_and_repeat — Wed, 18 Dec 2019 07:40:53 GMT

thanks.

Re: i2c bus busy problem

jeffthompson — Thu, 19 Dec 2019 20:47:27 GMT

Try reconfiguring the clock as a GPIO pin, toggle it 16 times, then configure it back to an I2C clock and try again.

See Common Problems In Systems - I2C Bus. Got to Analyzing Obscure Problems/Blocked I2C Bus.