setting pins on various ports in gpio LM3SD96

Question

I want to set a few pins in GPIO ports PA, PD, and PF on a Stellaris LM3S9D96.

I know the bit operation procedures needed to that, but I am confused on how to select different pins in ports PA, PD, etc. and AND them with appropriate masks. Could someone explain these operations to me?

Answer 1

The ports on the Stellaris chips are pin addressable. This made really easy if you use the StellarisWare Driver Library .

The User Guide has a pretty good example of how to use the GPIO Library functions. From page 142-143:

9.3 Programming Example

The following example shows how to use the GPIO API to initialize the GPIO, enable interrupts, read data from pins, and write data to pins.

 int iVal; // // Register the port-level interrupt handler. This handler is the first // level interrupt handler for all the pin interrupts. // GPIOPortIntRegister(GPIO_PORTA_BASE, PortAIntHandler); // // Initialize the GPIO pin configuration. // // Set pins 2, 4, and 5 as input, SW controlled. // GPIOPinTypeGPIOInput(GPIO_PORTA_BASE, GPIO_PIN_2 | GPIO_PIN_4 | GPIO_PIN_5); // // Set pins 0 and 3 as output, SW controlled. // GPIOPinTypeGPIOOutput(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_3); // // Make pins 2 and 4 rising edge triggered interrupts. // GPIOIntTypeSet(GPIO_PORTA_BASE, GPIO_PIN_2 | GPIO_PIN_4, GPIO_RISING_EDGE); // // Make pin 5 high level triggered interrupts. // GPIOIntTypeSet(GPIO_PORTA_BASE, GPIO_PIN_5, GPIO_HIGH_LEVEL); // // Read some pins. // iVal = GPIOPinRead(GPIO_PORTA_BASE, (GPIO_PIN_0 | GPIO_PIN_2 | GPIO_PIN_3 | GPIO_PIN_4 | GPIO_PIN_5)); // // Write some pins. Even though pins 2, 4, and 5 are specified, those pins // are unaffected by this write because they are configured as inputs. At // the end of this write, pin 0 will be a 0, and pin 3 will be a 1. // GPIOPinWrite(GPIO_PORTA_BASE, (GPIO_PIN_0 | GPIO_PIN_2 | GPIO_PIN_3 | GPIO_PIN_4 | GPIO_PIN_5), 0xF8); // // Enable the pin interrupts. // GPIOPinIntEnable(GPIO_PORTA_BASE, GPIO_PIN_2 | GPIO_PIN_4 | GPIO_PIN_5);