Posted on May 17, 2011 at 09:54Hi,
I'm after some clarification on the correct configuration of GPIO pins when used for I2C.
I see from the doc'n that each I2C pin (Clock & Data) has both an IN and an OUT (via alternative input/output settings). Does this mean, for example, that for a Master the CLK pin remains as an output, but the Data pin needs to be re-configured to be an input during a read cycle- or will the following work?
// Configure I2C1 as Master on port 2
vl_GPIO_InitStructure.GPIO_Direction = GPIO_PinOutput;
vl_GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
vl_GPIO_InitStructure.GPIO_Type = GPIO_Type_OpenCollector ;
vl_GPIO_InitStructure.GPIO_IPConnected = GPIO_IPConnected_Enable;
vl_GPIO_InitStructure.GPIO_Alternate = GPIO_OutputAlt2;
GPIO_Init (GPIO2, &vl_GPIO_InitStructure);
Presumably, the required GPIO configuration for Master and Slave I2C ports are different...?
Thanks
Dave
