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i2c slave on pic18f2420

 
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jenipapo



Joined: 27 Jan 2008
Posts: 4
Location: France

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i2c slave on pic18f2420
PostPosted: Thu Jan 06, 2011 9:39 am     Reply with quote
Dear all,
I use a pic18f2420 as an i2c counter. The pic is i2cslave and time to time another microprocessor (arm9) read pic contents values using i2c bus.
Time to time, the arm9 reset the whole system using watchdog, EXCEPTING pic device. If, at this moment, the bus i2c were busy, specially on a reading sequence, specially reading 0 (SDA low), the pic continue, after this reset, to held SDA line low, therefore the whole i2c bus is weak. How could I do to avoid this situation without resetting the pic by arm reset.
Thank you for your help.
--
Christian
Ttelmah



Joined: 11 Mar 2010
Posts: 19553

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PostPosted: Thu Jan 06, 2011 11:12 am     Reply with quote
Reset the PIC, with it's watchdog. Have I2C 'complete' transactions, reset it's watchdog, choose a time that suits the transactions from the ARM, and it'll reset if the I2C bus hangs for any reason.

Best Wishes
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