Extconfig question

[nikhil]

Hello,
I am trying to read two different pwm using STM32F4 mcu. I have successfully read pwm on pin PA7 using extconfig by refering to testhal example. Code looks like snippet below.

Code: Select all

static const EXTConfig extcfg = {
  {
    {EXT_CH_MODE_DISABLED, NULL},
    {EXT_CH_MODE_DISABLED, NULL},
    {EXT_CH_MODE_DISABLED, NULL},
    {EXT_CH_MODE_DISABLED, NULL},
    {EXT_CH_MODE_DISABLED, NULL},
    {EXT_CH_MODE_DISABLED, NULL},
    {EXT_CH_MODE_DISABLED, NULL } ,  
    {EXT_CH_MODE_BOTH_EDGES | EXT_CH_MODE_AUTOSTART, extcb1 },  
    {EXT_CH_MODE_DISABLED, NULL},
    {EXT_CH_MODE_DISABLED, NULL},
    {EXT_CH_MODE_DISABLED, NULL},
    {EXT_CH_MODE_DISABLED, NULL},
    {EXT_CH_MODE_DISABLED, NULL},
    {EXT_CH_MODE_DISABLED, NULL},
    {EXT_CH_MODE_DISABLED, NULL}, 
    {EXT_CH_MODE_DISABLED, NULL}  
  },
  EXT_MODE_EXTI(
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        EXT_MODE_GPIOA,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0
        )

};

Now I wnt to configure pin PC7 in order to read another pwm with extcb2 function. However I am not able to define extconfig as both pins PA7 anf PC7 share same pin number. Can you help me out to define extconfig in order to use both PA7 and PC7 pins ?

--
nikhil

[Giovanni]

You can't. The STM32 does not allow the same bit on different ports, see the RM in the EXTI section.

Giovanni