Unable to read eTPU pin as input mode

[rahulmankumbare]

Hi,

We are using MPC5777C. S32DS v1.2.

We want to make ETPUA4 pin 118 as an input.

We are using etpu GPIO code generated from etpu function selector as a reference.

We have managed to make ETPUA4 in output mode & able to make it high & low.

But when we confugure it in input mode. We are not able to read the pin status.

fs_etpu_init( my_etpu_config, (uint32_t *)etpu_code, sizeof(etpu_code), \
(uint32_t *)etpu_globals, sizeof(etpu_globals));

my_system_etpu_start();

SIU.PCR[118].B.IBE = 1; // ETPUA4 as an input pin
SIU.PCR[118].B.PA = 1; // primary function as ETPUA4

fs_etpu_gpio_init(4,FS_ETPU_PRIORITY_HIGH);

fs_etpu_gpio_input_immed(4);
if(eTPU->CHAN[4].SCR.B.IPS==1) // read status register
{
 SIU.GPDO[154].B.PDOn = 1; // USER LED OFF
}
else
{
 SIU.GPDO[154].B.PDOn = 0; // USER led ON
}

Above is the code that we are using to read the pin status.

Please suggest if anything is missing.

Thanks.

Rahul.

[davidtosenovjan]

Hi, it is needed to add

pinstate = fs_etpu_gpio_pin_history (4);

Function fs_etpu_gpio_input_immed only latches the pin value into variable PINSTATE.

[rahulmankumbare]

 Hi,

Now we have tried with following code but still pinstate variable haviong value 0 only.

I am connecting a switch to GPIO1 & pressing it, so that value on GPIO1 gets changed.

while(1)
{
fs_etpu_gpio_input_immed (GPIO1);
while(eTPU->CHAN[GPIO1].SCR.B.CIS == 0); /* wait for eTPU_A Channel 1 interrupt status bit to be set */
eTPU->CHAN[GPIO1].SCR.B.CIS = 1;
eTPU->CHAN[GPIO1].SCR.B.DTRS =1;

pinstate = fs_etpu_gpio_pin_history (GPIO1);

delay();

}

Please suggest.

Thanks.

Rahul

[davidtosenovjan]

And this way you don't see valid result in LSB bit of pinstate variable? Do you have properly setup SIU_PCR register for this pin?

[rahulmankumbare]

Hi,

SIU.PCR[118].B.IBE = 1; // ETPUA4 as an input pin
SIU.PCR[118].B.PA = 1; // primary function as ETPUA4

Above is the SIU_PCR register setting.

Thanks.

Rahul