[STM32]因为主设备复位而造成的i2c卡死解决方案
很多时候I2C设备会因为32的复位出现问题,本人也在最近遇到这个问题,这里分享一个解决办法
以下摘自stm32f1的勘误手册:
- Disable the I2C peripheral by clearing the PE bit in I2Cx_CR1 register.
- Configure the SCL and SDA I/Os as General Purpose Output Open-Drain, High level
(Write 1 to GPIOx_ODR).- Check SCL and SDA High level in GPIOx_IDR.
- Configure the SDA I/O as General Purpose Output Open-Drain, Low level (Write 0 to
GPIOx_ODR).- Check SDA Low level in GPIOx_IDR.
- Configure the SCL I/O as General Purpose Output Open-Drain, Low level (Write 0 to
GPIOx_ODR).- Check SCL Low level in GPIOx_IDR.
- Configure the SCL I/O as General Purpose Output Open-Drain, High level (Write 1 to
GPIOx_ODR).- Check SCL High level in GPIOx_IDR.
- Configure the SDA I/O as General Purpose Output Open-Drain , High level (Write 1 to
GPIOx_ODR).- Check SDA High level in GPIOx_IDR.
- Configure the SCL and SDA I/Os as Alternate function Open-Drain.
- Set SWRST bit in I2Cx_CR1 register.
- Clear SWRST bit in I2Cx_CR1 register.
- Enable the I2C peripheral by setting the PE bit in I2Cx_CR1 register.
但是实际测试下来还是可能会出问题,最后发现得将两个引脚Deinit才比较稳定,另外如果一次不行的话可能得用多次。