How to read a digital signal from GPIO pins ,trying to interface pir sensor.

Hi Nikesh,

Which pin of CC3200 LP are you using to read the PIR sensor status?

Regards,
Ankur

Thank you Ankur for replying
im using Pin 15 ,which is GPIO 6.if there is a problem with this pin what other pins could i use?
Is the above code right?

Hi Nikesh,

I think you mean to say Pin 6 which is GPIO15.

Please note in 'gpio_if.c' file provided in the SDK there are checks for the LED pin.
You will need to add the pinmux for the pin you are using and you can call following API (available in gpio_if.c) to configure and check the status on GPIO.
GPIO_IF_GetPortNPin(GPIO_USED, &port, &pin);
status = GPIO_IF_Get(GPIO_USED, port, pin);

Please refer to gpio_if.c for details.

If you want to get a trigger from PIR senson why don't you use interrupt.

Regards,
Ankur

thank you ankur,
i thought of using interrupts first but i couldn't figure how to use them ,it would be really helpful if u can show me how to use them
any example or link where i could learn how to use interrupts in cc3200

Nikesh,

You can refer to the 'button_if.c' file available under "<cc3200_sdk>/examples/common" directory. In this file interrupts on two GPIO (connected to button) are configured.

Regards,
Ankur

thank you ankur,
as u said i tried to use the interrupts but they are not working ,
i tried to turn on the red led and orange led when i press the switch buttons but they are not working ,
The code doesn't jump anywhere upon key press. It keep in while(){} loop.
I am expecting it to go to Interrupt handler, but it doesn't.
here is the code snippet:-

void S2InterruptHdl()
{
GPIO_IF_LedOn(MCU_ORANGE_LED_GPIO);
MAP_UtilsDelay(8000000);
}
void S3InterruptHdl()
{
GPIO_IF_LedOn(MCU_RED_LED_GPIO);
MAP_UtilsDelay(8000000);
}
int
main()
{
//
// Initialize Board configurations
//
BoardInit();

//
// Power on the corresponding GPIO port B for 9,10,11.
// Set up the GPIO lines to mode 0 (GPIO)
//
PinMuxConfig();
GPIO_IF_LedConfigure(LED1|LED2|LED3);

GPIO_IF_LedOff(MCU_ALL_LED_IND);
Button_IF_Init(S2InterruptHdl,S3InterruptHdl );//Initialize Push Button GPIO
Button_IF_EnableInterrupt(SW2); Button_IF_EnableInterrupt(SW3);//Enables Push Button GPIO Interrupt


while(1)
{ }
return 0;

}

Hi Nikesh,

Did you add the pinmux for the these two button pins?
You will need to pinmux these pins as GPIO input.

Regards,
Ankur

thanky ou ankur,

no i didnt add the pinmux,could you tell me the pin address of those two buttons .because in the button_if.c file the two pins are named as GPIO 5 and GPIO 6 but in the board its mentioned as GPIO 22 and GPIO13  ,which one is correct. if possible could you post the code snippet for the pinmux with a valid port (ulPort) and pin(ucPin) address.

thank you ankur,
i figured the problem was that i didn't enable the peripheral clock :MAP_PRCMPeripheralClkEnable(PRCM_GPIOA2, PRCM_RUN_MODE_CLK);
pinmux tool helped me to identify and solve the problem.