Re: TXCOMP timeout - AT91 TWI | |
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hi, > I recieve a TXCOMP timeout after doing some i2c transactions, it is not consistant (timeout sometimes happen after 50 transactions, sometimes after 2 or 3), and the debug log showed me, that I get a TXCOMP timeout 1st followed by the TXRDY, RXRDY timeout in the subsequent transactions. If you read through the archives of the arm-linux-kernel mailing list you will see that there are a number of hardware issues with Atmel's TWI controller. Basically because it does not have a FIFO or PDC support, any slight delay in writing data to the transmit register causes the controller to automatically send a STOP and complete the transfer. > Also how do I resolve the issue ?> > I use a 2.6.22 kernel with at91sam9261ek_defconfig and a patch for at91 (2.6.22-at91.patch) provided in linux4sam.org. In newer kernel versions we have switched over to using a bit-banging driver for I2C transfers on AT91 platforms. I recommend you upgrade to a newer kernel version and switch over to the I2C_GPIO driver. Regards, Andrew Victor ------------------------------------------------------------------- List admin: http://lists.arm.linux.org.uk/mailman/listinfo/linux-arm FAQ: http://www.arm.linux.org.uk/mailinglists/faq.php Etiquette: http://www.arm.linux.org.uk/mailinglists/etiquette.php
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