The following is the key, the following settings IO can use the hardware IIC normally
GPIO_Init(GPIOB, GPIO_PIN_4, GPIO_MODE_OUT_OD_HIZ_SLOW); //IIC,OD outPut
GPIO_Init(GPIOB, GPIO_PIN_5, GPIO_MODE_OUT_OD_HIZ_SLOW); //IIC,OD outPut
//or
GPIO_Init(GPIOB, GPIO_PIN_4, GPIO_MODE_OUT_OD_HIZ_FAST); //IIC,OD outPut
GPIO_Init(GPIOB, GPIO_PIN_5, GPIO_MODE_OUT_OD_HIZ_FAST); //IIC,OD outPut
The following settings IO cannot use the hardware IIC normally
GPIO_Init(GPIOB, GPIO_PIN_4, GPIO_MODE_OUT_OD_LOW_SLOW); //IIC,OD outPut
GPIO_Init(GPIOB, GPIO_PIN_5, GPIO_MODE_OUT_OD_LOW_SLOW); //IIC,OD outPut
//or
GPIO_Init(GPIOB, GPIO_PIN_4, GPIO_MODE_OUT_OD_LOW_FAST); //IIC,OD outPut
GPIO_Init(GPIOB, GPIO_PIN_5, GPIO_MODE_OUT_OD_LOW_FAST); //IIC,OD outPut
The key is not to set the IIC port to output low level, otherwise it will always be stuck in busy detection. It is not easy to find the problem here because when the IO is initialized first, it is output at a low level, and then when the IIC is initialized, the IIC hardware uses an external pull-up to turn it into a high level. You think the IO port is normal, but it actually fails in the busy detection.
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