F429 I2C bug

[ausera uirwaij]

Hi, i'm using stm32f429 to develop i2c communication, the mcu cannot generate START signal after running a few minutes but the SDA and SCL all high, I add the CR1 register to watch and find the CR1 cannot be modified after calling the bellowing:

breakpoint1: I2C1->CR1 |= (1<<10); // Enable the ACK

I2C1->CR1 |= (1<<8); // Generate START

breakpoint2: while (!(I2C1->SR1 & (1<<0)));

CR1 can be modified to be what I set after reset the mcu, .

[Amel NASRI]

Hi @ausera uirwaij​ ,

Look to the errata sheet of STM32F429 and check first that you are not facing one of the I2C limitations.

-Amel

[ausera uirwaij]

Thank you Amel,

I read this sheet when I encountered this problem. But just software reseting the I2C as the sheet said doesn't solve my problem .