#432 Support 10-bit addresses in STM32 I2C driver

[Peter Schuster]

For I2C addresses in the format of "11110XX" (reserved address/header for 10-bit addresses by I2C specification) the STM32 hardware automatically switches to 10-bit addressing mode. The triggered event/interrupt (EV9) is not handled by the driver and is therefore triggered by the hardware in an infinite loop.

The attached patch adds support for 10-bit addresses to the STM32 I2C driver.

[Peter Schuster]

Sorry, there was a small error in the patch. Here comes v2.

[Giovanni Di Sirio]

Fixed in repository, will be fixed in 2.6.2stable, 2.7.0unstable and 3.0.0development.

[Peter Schuster]

Thanks for applying the patch. Unfortunally it was the first version, not the revised one (0001-STM32-I2C-10-bit-addressing-mode2.patch). This included a small error:

dp->DR = 0xF0 | (0x1 & i2cp->addr) | (0x3 & (i2cp->addr >> 9));

must be replaced with

dp->DR = 0xF0 | (0x1 & i2cp->addr) | (0x6 & (i2cp->addr >> 8));

Because the last bit is the R/W bit.

Thinking about this it probably would be better to change the order of the respective assignment to

dp->DR = 0xF0 | (0x6 & (i2cp->addr >> 8)) | (0x1 & i2cp->addr);

[Giovanni Di Sirio]

Hi,

Fix applied, thanks for finding.

Giovanni