//*****************************************************************************
// Turns on the alternate function for the given pins
//*****************************************************************************
bool gpio_config_alternate_function(uint32_t baseAddr, uint8_t pins) {
GPIOA_Type *gpioPort;
// Verify the address
if(!verifyBaseAddr(baseAddr)) {
return false;
}
// Set the alternate function on selected pins
gpioPort = (GPIOA_Type *) baseAddr;
gpioPort->AFSEL |=pins;
return true;
}
//*****************************************************************************
// Enables a pin as an analog input for the provided pins
//*****************************************************************************
bool gpio_config_analog_enable(uint32_t baseAddr, uint8_t pins) {
GPIOA_Type *gpioPort;
// Verify the address
if(!verifyBaseAddr(baseAddr)) {
return false;
}
// Set the AMSEL on selected pins
gpioPort = (GPIOA_Type *) baseAddr;
gpioPort->AMSEL |= pins;
return true;
}
//*****************************************************************************
// Opens the drain for specified pins
//*****************************************************************************
bool gpio_config_open_drain(uint32_t baseAddr, uint32_t pins) {
GPIOA_Type *gpioPort;
// Verify that the base address is a valid GPIO base address
// using the verifyBaseAddr function provided above
if(!verifyBaseAddr(baseAddr))
return false;
// Type Cast the base address to a GPIOA_Type pointer
gpioPort = (GPIOA_Type *)baseAddr;
// Set the pins as outputs
gpioPort->ODR |= pins;
return true;
}
//*****************************************************************************
// Setting a pins as a digital enable requires writing to DEN register
//
// Paramters
// pins - A bit mask indicating which pins should be configured as digital
// pins. Modify only the bits where the bitmask is equal to 1.
//
// Use section 10.5 of the TM4C123 data sheet to determine the bits to set in
// the DEN register.
//
//*****************************************************************************
bool gpio_config_digital_enable(uint32_t baseAddr, uint8_t pins)
{
GPIOA_Type *gpioPort;
// Verify that the base address is a valid GPIO base address
// using the verifyBaseAddr function provided above
if(!verifyBaseAddr(baseAddr))
return false;
// Type Cast the base address to a GPIOA_Type pointer
gpioPort = (GPIOA_Type *) baseAddr;
// Turn on the digital enable
gpioPort->DEN |=pins;
return true;
}
//*****************************************************************************
// Enabling a pull-up resistor requires setting the PDR regsiter
//
// Paramters
// baseAddr - Base address of GPIO port that is being enabled.
// pins - A bit mask indicating which pins should be configured with a
// pull-down resistor
//*****************************************************************************
bool gpio_config_enable_pulldown(uint32_t baseAddr, uint8_t pins)
{
GPIOA_Type *gpioPort;
// Verify that the base address is a valid GPIO base address
// using the verifyBaseAddr function provided above
if(!verifyBaseAddr(baseAddr)) {
return false;
}
// Type Cast the base address to a GPIOA_Type pointer
gpioPort = (GPIOA_Type *) baseAddr;
// Enable the pull-down resistors
gpioPort->PDR |=pins;
return true;
}
//*****************************************************************************
// Setting a GPIO pin as an output requires setting the DIR register
//
// Paramters
// pins - A bit mask indicating which pins should be configured as output
// pins. Modify only the bits where the bitmask is equal to 1.
//
// Use section 10.5 of the TM4C123 data sheet to determine the bits to set in
// the DIR register.
//
//*****************************************************************************
bool gpio_config_enable_input(uint32_t baseAddr, uint8_t pins)
{
GPIOA_Type *gpioPort;
// Verify that the base address is a valid GPIO base address
// using the verifyBaseAddr function provided above
if(!verifyBaseAddr(baseAddr)) {
return false;
}
// Type Cast the base address to a GPIOA_Type pointer
gpioPort = (GPIOA_Type *) baseAddr;
// Set the pins as inputs
gpioPort->DIR &=~pins;
return true;
}
bool gpio_config_open_drain(uint32_t gpioBase, uint8_t pins)
{
GPIOA_Type *gpioPort;
// Verify that the base address is a valid GPIO base address
// using the verifyBaseAddr function provided above
if( verifyBaseAddr(gpioBase) == false)
{
return false;
}
// Type Cast the base address to a GPIOA_Type pointer
gpioPort = (GPIOA_Type *)gpioBase;
// Configure pins as open-drain
gpioPort->ODR |= pins;
return true;
}
//*****************************************************************************
bool gpio_config_analog_enable(uint32_t baseAddr, uint8_t pins)
{
GPIOA_Type *gpioPort;
// ADD CODE
// Verify that the base address is a valid GPIO base address
// using the verifyBaseAddr function provided above
if( verifyBaseAddr(baseAddr) == false)
{
return false;
}
// ADD CODE
// Type Cast the base address to a GPIOA_Type pointer
gpioPort = (GPIOA_Type *)baseAddr;
// ADD CODE
// Enable analog pins
gpioPort->AMSEL |= pins;
return true;
}
//*****************************************************************************
bool gpio_config_port_control(uint32_t baseAddr, uint32_t pins)
{
GPIOA_Type *gpioPort;
// ADD CODE
// Verify that the base address is a valid GPIO base address
// using the verifyBaseAddr function provided above
if( verifyBaseAddr(baseAddr) == false)
{
return false;
}
// ADD CODE
// Type Cast the base address to a GPIOA_Type pointer
gpioPort = (GPIOA_Type *)baseAddr;
// ADD CODE
// Set the port control register
gpioPort->PCTL |= pins;
return true;
}
