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gpio.c
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gpio.c
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// GPIO Library
// Jason Losh
//-----------------------------------------------------------------------------
// Hardware Target
//-----------------------------------------------------------------------------
// Target Platform: EK-TM4C123GXL with LCD/Keyboard Interface
// Target uC: TM4C123GH6PM
// System Clock: 40 MHz
// Hardware configuration:
// GPIO APB ports A-F
//-----------------------------------------------------------------------------
// Device includes, defines, and assembler directives
//-----------------------------------------------------------------------------
#include <stdint.h>
#include <stdbool.h>
#include "tm4c123gh6pm.h"
#include "gpio.h"
// Bit offset of the registers relative to bit 0 of DATA_R at 3FCh
// reg offset x 4 bytes / reg x 8 bits / byte
#define OFS_DATA_TO_DIR 1*4*8
#define OFS_DATA_TO_IS 2*4*8
#define OFS_DATA_TO_IBE 3*4*8
#define OFS_DATA_TO_IEV 4*4*8
#define OFS_DATA_TO_IM 5*4*8
#define OFS_DATA_TO_IC 8*4*8
#define OFS_DATA_TO_AFSEL 9*4*8
#define OFS_DATA_TO_ODR 68*4*8
#define OFS_DATA_TO_PUR 69*4*8
#define OFS_DATA_TO_PDR 70*4*8
#define OFS_DATA_TO_DEN 72*4*8
#define OFS_DATA_TO_CR 74*4*8
#define OFS_DATA_TO_AMSEL 75*4*8
//-----------------------------------------------------------------------------
// Global variables
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// Subroutines
//-----------------------------------------------------------------------------
void enablePort(PORT port)
{
switch(port)
{
case PORTA:
SYSCTL_RCGCGPIO_R |= SYSCTL_RCGCGPIO_R0;
SYSCTL_GPIOHBCTL_R &= ~1;
break;
case PORTB:
SYSCTL_RCGCGPIO_R |= SYSCTL_RCGCGPIO_R1;
SYSCTL_GPIOHBCTL_R &= ~2;
break;
case PORTC:
SYSCTL_RCGCGPIO_R |= SYSCTL_RCGCGPIO_R2;
SYSCTL_GPIOHBCTL_R &= ~4;
break;
case PORTD:
SYSCTL_RCGCGPIO_R |= SYSCTL_RCGCGPIO_R3;
SYSCTL_GPIOHBCTL_R &= ~8;
break;
case PORTE:
SYSCTL_RCGCGPIO_R |= SYSCTL_RCGCGPIO_R4;
SYSCTL_GPIOHBCTL_R &= ~16;
break;
case PORTF:
SYSCTL_RCGCGPIO_R |= SYSCTL_RCGCGPIO_R5;
SYSCTL_GPIOHBCTL_R &= ~32;
}
_delay_cycles(3);
}
void disablePort(PORT port)
{
switch(port)
{
case PORTA:
SYSCTL_RCGCGPIO_R &= ~SYSCTL_RCGCGPIO_R0;
break;
case PORTB:
SYSCTL_RCGCGPIO_R &= ~SYSCTL_RCGCGPIO_R1;
break;
case PORTC:
SYSCTL_RCGCGPIO_R &= ~SYSCTL_RCGCGPIO_R2;
break;
case PORTD:
SYSCTL_RCGCGPIO_R &= ~SYSCTL_RCGCGPIO_R3;
break;
case PORTE:
SYSCTL_RCGCGPIO_R &= ~SYSCTL_RCGCGPIO_R4;
break;
case PORTF:
SYSCTL_RCGCGPIO_R &= ~SYSCTL_RCGCGPIO_R5;
}
_delay_cycles(3);
}
void selectPinPushPullOutput(PORT port, uint8_t pin)
{
uint32_t* p;
p = (uint32_t*)port + pin + OFS_DATA_TO_ODR;
*p = 0;
p = (uint32_t*)port + pin + OFS_DATA_TO_DIR;
*p = 1;
p = (uint32_t*)port + pin + OFS_DATA_TO_DEN;
*p = 1;
}
void selectPinOpenDrainOutput(PORT port, uint8_t pin)
{
uint32_t* p;
p = (uint32_t*)port + pin + OFS_DATA_TO_ODR;
*p = 1;
p = (uint32_t*)port + pin + OFS_DATA_TO_DIR;
*p = 1;
p = (uint32_t*)port + pin + OFS_DATA_TO_DEN;
*p = 1;
}
void selectPinDigitalInput(PORT port, uint8_t pin)
{
uint32_t* p;
p = (uint32_t*)port + pin + OFS_DATA_TO_DIR;
*p = 0;
p = (uint32_t*)port + pin + OFS_DATA_TO_DEN;
*p = 1;
p = (uint32_t*)port + pin + OFS_DATA_TO_AMSEL;
*p = 0;
}
void selectPinAnalogInput(PORT port, uint8_t pin)
{
uint32_t* p;
p = (uint32_t*)port + pin + OFS_DATA_TO_DEN;
*p = 0;
p = (uint32_t*)port + pin + OFS_DATA_TO_AMSEL;
*p = 1;
p = (uint32_t*)port + pin + OFS_DATA_TO_AFSEL;
*p = 1;
}
void setPinCommitControl(PORT port, uint8_t pin)
{
switch(port)
{
case PORTA:
GPIO_PORTA_LOCK_R = GPIO_LOCK_KEY;
break;
case PORTB:
GPIO_PORTB_LOCK_R = GPIO_LOCK_KEY;
break;
case PORTC:
GPIO_PORTC_LOCK_R = GPIO_LOCK_KEY;
break;
case PORTD:
GPIO_PORTD_LOCK_R = GPIO_LOCK_KEY;
break;
case PORTE:
GPIO_PORTE_LOCK_R = GPIO_LOCK_KEY;
break;
case PORTF:
GPIO_PORTF_LOCK_R = GPIO_LOCK_KEY;
}
uint32_t* p;
p = (uint32_t*)port + pin + OFS_DATA_TO_CR;
*p = 1;
}
void enablePinPullup(PORT port, uint8_t pin)
{
uint32_t* p;
p = (uint32_t*)port + pin + OFS_DATA_TO_PUR;
*p = 1;
}
void disablePinPullup(PORT port, uint8_t pin)
{
uint32_t* p;
p = (uint32_t*)port + pin + OFS_DATA_TO_PUR;
*p = 0;
}
void enablePinPulldown(PORT port, uint8_t pin)
{
uint32_t* p;
p = (uint32_t*)port + pin + OFS_DATA_TO_PDR;
*p = 1;
}
void disablePinPulldown(PORT port, uint8_t pin)
{
uint32_t* p;
p = (uint32_t*)port + pin + OFS_DATA_TO_PDR;
*p = 0;
}
void setPinAuxFunction(PORT port, uint8_t pin, uint32_t fn)
{
// call with header file shifted values or 4-bit number
if (fn <= 15)
fn = fn << (pin*4);
else
fn = fn & (0x0000000F << (pin*4));
switch(port)
{
case PORTA:
GPIO_PORTA_PCTL_R = (GPIO_PORTA_PCTL_R & ~(0x0000000F << (pin*4))) | fn;
break;
case PORTB:
GPIO_PORTB_PCTL_R = (GPIO_PORTB_PCTL_R & ~(0x0000000F << (pin*4))) | fn;
break;
case PORTC:
GPIO_PORTC_PCTL_R = (GPIO_PORTC_PCTL_R & ~(0x0000000F << (pin*4))) | fn;
break;
case PORTD:
GPIO_PORTD_PCTL_R = (GPIO_PORTD_PCTL_R & ~(0x0000000F << (pin*4))) | fn;
break;
case PORTE:
GPIO_PORTE_PCTL_R = (GPIO_PORTE_PCTL_R & ~(0x0000000F << (pin*4))) | fn;
break;
case PORTF:
GPIO_PORTF_PCTL_R = (GPIO_PORTF_PCTL_R & ~(0x0000000F << (pin*4))) | fn;
}
// set AFSEL bit only if using aux function, otherwise clear bit
uint32_t* p;
p = (uint32_t*)port + pin + OFS_DATA_TO_AFSEL;
*p = (fn > 0);
}
void selectPinInterruptRisingEdge(PORT port, uint8_t pin)
{
uint32_t* p;
p = (uint32_t*)port + pin + OFS_DATA_TO_IS;
*p = 0;
p = (uint32_t*)port + pin + OFS_DATA_TO_IBE;
*p = 0;
p = (uint32_t*)port + pin + OFS_DATA_TO_IEV;
*p = 1;
}
void selectPinInterruptFallingEdge(PORT port, uint8_t pin)
{
uint32_t* p;
p = (uint32_t*)port + pin + OFS_DATA_TO_IS;
*p = 0;
p = (uint32_t*)port + pin + OFS_DATA_TO_IBE;
*p = 0;
p = (uint32_t*)port + pin + OFS_DATA_TO_IEV;
*p = 0;
}
void selectPinInterruptBothEdges(PORT port, uint8_t pin)
{
uint32_t* p;
p = (uint32_t*)port + pin + OFS_DATA_TO_IS;
*p = 0;
p = (uint32_t*)port + pin + OFS_DATA_TO_IBE;
*p = 1;
}
void selectPinInterruptHighLevel(PORT port, uint8_t pin)
{
uint32_t* p;
p = (uint32_t*)port + pin + OFS_DATA_TO_IS;
*p = 1;
p = (uint32_t*)port + pin + OFS_DATA_TO_IEV;
*p = 1;
}
void selectPinInterruptLowLevel(PORT port, uint8_t pin)
{
uint32_t* p;
p = (uint32_t*)port + pin + OFS_DATA_TO_IS;
*p = 1;
p = (uint32_t*)port + pin + OFS_DATA_TO_IEV;
*p = 0;
}
void enablePinInterrupt(PORT port, uint8_t pin)
{
uint32_t* p;
p = (uint32_t*)port + pin + OFS_DATA_TO_IM;
*p = 1;
}
void disablePinInterrupt(PORT port, uint8_t pin)
{
uint32_t* p;
p = (uint32_t*)port + pin + OFS_DATA_TO_IM;
*p = 0;
}
void clearPinInterrupt(PORT port, uint8_t pin)
{
uint32_t* p;
p = (uint32_t*)port + pin + OFS_DATA_TO_IC;
*p = 1;
}
void setPinValue(PORT port, uint8_t pin, bool value)
{
uint32_t* p;
p = (uint32_t*)port + pin;
*p = value;
}
bool getPinValue(PORT port, uint8_t pin)
{
uint32_t* p;
p = (uint32_t*)port + pin;
return *p;
}
void setPortValue(PORT port, uint8_t value)
{
switch(port)
{
case PORTA:
GPIO_PORTA_DATA_R = value;
break;
case PORTB:
GPIO_PORTB_DATA_R = value;
break;
case PORTC:
GPIO_PORTC_DATA_R = value;
break;
case PORTD:
GPIO_PORTD_DATA_R = value;
break;
case PORTE:
GPIO_PORTE_DATA_R = value;
break;
case PORTF:
GPIO_PORTF_DATA_R = value;
}
}
uint8_t getPortValue(PORT port)
{
uint8_t value;
switch(port)
{
case PORTA:
value = GPIO_PORTA_DATA_R;
break;
case PORTB:
value = GPIO_PORTB_DATA_R;
break;
case PORTC:
value = GPIO_PORTC_DATA_R;
break;
case PORTD:
value = GPIO_PORTD_DATA_R;
break;
case PORTE:
value = GPIO_PORTE_DATA_R;
break;
case PORTF:
value = GPIO_PORTF_DATA_R;
}
return value;
}