/**
* \brief This function writes a logic 1 or a logic 0 to the specified pin.
*
* \param baseAdd The memory address of the GPIO instance being used.
* \param pinNumber The serial number of the GPIO pin.
* The 144 GPIO pins have serial numbers from 1 to 144.
*
* \param bitValue This signifies whether to write a logic 0 or logic 1
* to the specified pin.This variable can take any of the
* following two values:
* 1> GPIO_PIN_LOW, which indicates to clear(logic 0) the bit.
* 2> GPIO_PIN_HIGH, which indicates to set(logic 1) the bit.
*
* \return None.
*
* \note The pre-requisite to write to any pin is that the pin has to
* be configured as an output pin.
*/
void GPIOPinWrite(unsigned int baseAdd, unsigned int pinNumber,
unsigned int bitValue)
{
unsigned int regNumber = 0;
unsigned int pinOffset = 0;
/*
** Each register contains settings for each pin of two banks. The 32 bits
** represent 16 pins each from the banks. Thus the register number must be
** calculated based on 32 pins boundary.
*/
regNumber = (pinNumber - 1)/32;
/*
** In every register the least significant bits starts with a GPIO number on
** a boundary of 32. Thus the pin offset must be calculated based on 32
** pins boundary. Ex: 'pinNumber' of 1 corresponds to bit 0 in
** 'register_name01'.
*/
pinOffset = (pinNumber - 1) % 32;
if(GPIO_PIN_LOW == bitValue)
{
HWREG(baseAdd + GPIO_CLR_DATA(regNumber)) = (1 << pinOffset);
}
else if(GPIO_PIN_HIGH == bitValue)
{
HWREG(baseAdd + GPIO_SET_DATA(regNumber)) = (1 << pinOffset);
}
}
void GPIOBankPinsWrite(unsigned int baseAdd, unsigned int bankNumber,
unsigned int setPins, unsigned int clrPins)
{
unsigned int regNumber;
regNumber = bankNumber/2;
if (1 == (bankNumber % 2))
{
HWREG(baseAdd + GPIO_SET_DATA(regNumber)) = ((setPins & 0xFFFF) << 16);
HWREG(baseAdd + GPIO_CLR_DATA(regNumber)) = ((clrPins & 0xFFFF) << 16);
}
else
{
HWREG(baseAdd + GPIO_SET_DATA(regNumber)) = (setPins & 0xFFFF);
HWREG(baseAdd + GPIO_CLR_DATA(regNumber)) = (clrPins & 0xFFFF);
}
}
/**
* \brief This function writes a logic 1 or a logic 0 to the specified pin.
*
* \param baseAdd The memory address of the GPIO instance being used.
* \param pinNumber The serial number of the GPIO pin.
* The 144 GPIO pins have serial numbers from 1 to 144.
*
* \param bitValue This signifies whether to write a logic 0 or logic 1
* to the specified pin.This variable can take any of the
* following two values:
* 1> GPIO_PIN_LOW, which indicates to clear(logic 0) the bit.
* 2> GPIO_PIN_HIGH, which indicates to set(logic 1) the bit.
*
* \return None.
*
* \note The pre-requisite to write to any pin is that the pin has to
* be configured as an output pin.
*/
void GPIOPinWrite(unsigned int baseAdd, unsigned int pinNumber,
unsigned int bitValue)
{
unsigned int regNumber = 0;
unsigned int pinOffset = 0;
/*
** Each register contains settings for each pin of two banks. The 32 bits
** represent 16 pins each from the banks. Thus the register number must be
** calculated based on 32 pins boundary.
*/
regNumber = (pinNumber - 1)/32;
/*
-> 108 / 32 = 3.375 = 3
*/
/*
** In every register the least significant bits starts with a GPIO number on
** a boundary of 32. Thus the pin offset must be calculated based on 32
** pins boundary. Ex: 'pinNumber' of 1 corresponds to bit 0 in
** 'register_name01'.
*/
pinOffset = (pinNumber - 1) % 32;
/*
108 % 32 = 12
*/
if(GPIO_PIN_LOW == bitValue)
{
HWREG(baseAdd + GPIO_CLR_DATA(regNumber)) = (1 << pinOffset);
/*
baseAdd = 0x01E26000
GPIO_CLR_DATA(n) -> (0x1C + (0x28 * n)) -> 0x94
0x01E26000 + 0x94 -> 0x01E2 6094 -> CLR_DATA67
->GPIO Banks 6 and 7 Clear Data Register
CLR_DATA67 = (1<<12)
-> GP6P12 is set to output logic low
*/
}
else if(GPIO_PIN_HIGH == bitValue)
{
HWREG(baseAdd + GPIO_SET_DATA(regNumber)) = (1 << pinOffset);
}
}
