/****************************************************************************
* arch/arm/src/lpc17xx/lpc17_gpio.c
*
* Copyright (C) 2010-2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdint.h>
#include <stdbool.h>
#include <errno.h>
#include <debug.h>
#include <arch/irq.h>
#include "up_arch.h"
#include "chip.h"
#include "lpc17_gpio.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Default input pin configuration */
#define DEFAULT_INPUT (GPIO_INPUT|GPIO_PULLUP)
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/* These tables have global scope because they are also used in
* lpc17_gpiodbg.c
*/
/* We have to remember the configured interrupt setting.. PINs are not
* actually set up to interrupt until the interrupt is enabled.
*/
#ifdef CONFIG_GPIO_IRQ
uint64_t g_intedge0;
uint64_t g_intedge2;
#endif
/* FIO register base addresses */
const uint32_t g_fiobase[GPIO_NPORTS] =
{
LPC17_FIO0_BASE,
LPC17_FIO1_BASE,
LPC17_FIO2_BASE,
LPC17_FIO3_BASE,
LPC17_FIO4_BASE
};
/* Port 0 and Port 2 can provide a single interrupt for any combination of
* port pins
*/
const uint32_t g_intbase[GPIO_NPORTS] =
{
LPC17_GPIOINT0_BASE,
0,
LPC17_GPIOINT2_BASE,
0,
0
};
const uint32_t g_lopinsel[GPIO_NPORTS] =
{
LPC17_PINCONN_PINSEL0,
LPC17_PINCONN_PINSEL2,
LPC17_PINCONN_PINSEL4,
0,
0
};
const uint32_t g_hipinsel[GPIO_NPORTS] =
{
LPC17_PINCONN_PINSEL1,
LPC17_PINCONN_PINSEL3,
0,
LPC17_PINCONN_PINSEL7,
LPC17_PINCONN_PINSEL9
};
const uint32_t g_lopinmode[GPIO_NPORTS] =
{
LPC17_PINCONN_PINMODE0,
LPC17_PINCONN_PINMODE2,
LPC17_PINCONN_PINMODE4,
0,
0
};
const uint32_t g_hipinmode[GPIO_NPORTS] =
{
LPC17_PINCONN_PINMODE1,
LPC17_PINCONN_PINMODE3,
0,
LPC17_PINCONN_PINMODE7,
LPC17_PINCONN_PINMODE9
};
const uint32_t g_odmode[GPIO_NPORTS] =
{
LPC17_PINCONN_ODMODE0,
LPC17_PINCONN_ODMODE1,
LPC17_PINCONN_ODMODE2,
LPC17_PINCONN_ODMODE3,
LPC17_PINCONN_ODMODE4
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: lpc17_pinsel
*
* Description:
* Get the address of the PINSEL register corresponding to this port and
* pin number.
*
****************************************************************************/
static int lpc17_pinsel(unsigned int port, unsigned int pin, unsigned int value)
{
const uint32_t *table;
uint32_t regaddr;
uint32_t regval;
unsigned int shift;
/* Which table do we use */
if (pin < 16)
{
table = g_lopinsel;
shift = PINCONN_PINSELL_SHIFT(pin);
}
else
{
table = g_hipinsel;
shift = PINCONN_PINSELH_SHIFT(pin);
}
/* Fetch the PINSEL register address for this port/pin combination */
regaddr = table[port];
if (regaddr != 0)
{
/* Set the requested value in the PINSEL register */
regval = getreg32(regaddr);
regval &= ~(PINCONN_PINSEL_MASK << shift);
regval |= (value << shift);
putreg32(regval, regaddr);
return OK;
}
return -EINVAL;
}
/****************************************************************************
* Name: lpc17_pullup
*
* Description:
* Get the address of the PINMODE register corresponding to this port and
* pin number.
*
****************************************************************************/
static int lpc17_pullup(lpc17_pinset_t cfgset, unsigned int port, unsigned int pin)
{
const uint32_t *table;
uint32_t regaddr;
uint32_t regval;
uint32_t value;
unsigned int shift;
switch (cfgset & GPIO_PUMODE_MASK)
{
default:
case GPIO_PULLUP: /* Pull-up resistor enabled */
value = PINCONN_PINMODE_PU;
break;
case GPIO_REPEATER: /* Repeater mode enabled */
value = PINCONN_PINMODE_RM;
break;
case GPIO_FLOAT: /* Neither pull-up nor -down */
value = PINCONN_PINMODE_FLOAT;
break;
case GPIO_PULLDN: /* Pull-down resistor enabled */
value = PINCONN_PINMODE_PD;
break;
}
/* Which table do we use */
if (pin < 16)
{
table = g_lopinmode;
shift = PINCONN_PINMODEL_SHIFT(pin);
}
else
{
table = g_hipinmode;
shift = PINCONN_PINMODEH_SHIFT(pin);
}
/* Fetch the PINSEL register address for this port/pin combination */
regaddr = table[port];
if (regaddr != 0)
{
/* Set the requested value in the PINSEL register */
regval = getreg32(regaddr);
regval &= ~(PINCONN_PINMODE_MASK << shift);
regval |= (value << shift);
putreg32(regval, regaddr);
return OK;
}
return -EINVAL;
}
/****************************************************************************
* Name: lpc17_setintedge
*
* Description:
* Remember the configured interrupt edge. We can't actually enable the
* the edge interrupts until the called calls IRQ enabled function.
*
****************************************************************************/
#ifdef CONFIG_GPIO_IRQ
static void lpc17_setintedge(unsigned int port, unsigned int pin,
unsigned int value)
{
uint64_t *intedge;
unsigned int shift;
/* Which word to we use? */
if (port == 0)
{
intedge = &g_intedge0;
}
else if (port == 2)
{
intedge = &g_intedge2;
}
else
{
return;
}
/* Set the requested value in the PINSEL register */
shift = pin << 1;
*intedge &= ~((uint64_t)3 << shift);
*intedge |= ((uint64_t)value << shift);
}
#endif
/****************************************************************************
* Name: lpc17_setopendrain
*
* Description:
* Set the ODMODE register for open drain mode
*
****************************************************************************/
static void lpc17_setopendrain(unsigned int port, unsigned int pin)
{
uint32_t regaddr;
uint32_t regval;
regaddr = g_odmode[port];
regval = getreg32(regaddr);
regval |= (1 << pin);
putreg32(regval, regaddr);
}
/****************************************************************************
* Name: lpc17_clropendrain
*
* Description:
* Reset the ODMODE register to disable open drain mode
*
****************************************************************************/
static void lpc17_clropendrain(unsigned int port, unsigned int pin)
{
uint32_t regaddr;
uint32_t regval;
regaddr = g_odmode[port];
regval = getreg32(regaddr);
regval &= ~(1 << pin);
putreg32(regval, regaddr);
}
/****************************************************************************
* Name: lpc17_configinput
*
* Description:
* Configure a GPIO inpue pin based on bit-encoded description of the pin.
*
****************************************************************************/
static inline int lpc17_configinput(lpc17_pinset_t cfgset, unsigned int port, unsigned int pin)
{
uint32_t regval;
uint32_t fiobase;
uint32_t intbase;
uint32_t pinmask = (1 << pin);
/* Set up FIO registers */
fiobase = g_fiobase[port];
/* Set as input */
regval = getreg32(fiobase + LPC17_FIO_DIR_OFFSET);
regval &= ~pinmask;
putreg32(regval, fiobase + LPC17_FIO_DIR_OFFSET);
/* Set up interrupt registers */
intbase = g_intbase[port];
if (intbase != 0)
{
/* Disable any rising edge interrupts */
regval = getreg32(intbase + LPC17_GPIOINT_INTENR_OFFSET);
regval &= ~pinmask;
putreg32(regval, intbase + LPC17_GPIOINT_INTENR_OFFSET);
/* Disable any falling edge interrupts */
regval = getreg32(intbase + LPC17_GPIOINT_INTENF_OFFSET);
regval &= ~pinmask;
putreg32(regval, intbase + LPC17_GPIOINT_INTENF_OFFSET);
/* Forget about any falling/rising edge interrupt enabled */
#ifdef CONFIG_GPIO_IRQ
lpc17_setintedge(port, pin, 0);
#endif
}
/* Set up PINSEL registers */
/* Configure as GPIO */
lpc17_pinsel(port, pin, PINCONN_PINSEL_GPIO);
/* Set pull-up mode */
lpc17_pullup(cfgset, port, pin);
/* Open drain only applies to outputs */
lpc17_clropendrain(port, pin);
return OK;
}
/****************************************************************************
* Name: lpc17_configinterrupt
*
* Description:
* Configure a GPIO interrupt pin based on bit-encoded description of the pin.
*
****************************************************************************/
static inline int lpc17_configinterrupt(lpc17_pinset_t cfgset, unsigned int port,
unsigned int pin)
{
/* First, configure the port as a generic input so that we have a known
* starting point and consistent behavior during the re-configuration.
*/
(void)lpc17_configinput(cfgset, port, pin);
/* Then just remember the rising/falling edge interrupt enabled */
DEBUGASSERT(port == 0 || port == 2);
#ifdef CONFIG_GPIO_IRQ
lpc17_setintedge(port, pin, (cfgset & GPIO_EDGE_MASK) >> GPIO_EDGE_SHIFT);
#endif
return OK;
}
/****************************************************************************
* Name: lpc17_configoutput
*
* Description:
* Configure a GPIO output pin based on bit-encoded description of the pin.
*
****************************************************************************/
static inline int lpc17_configoutput(lpc17_pinset_t cfgset, unsigned int port,
unsigned int pin)
{
uint32_t fiobase;
uint32_t regval;
/* First, configure the port as a generic input so that we have a known
* starting point and consistent behavior during the re-configuration.
*/
(void)lpc17_configinput(DEFAULT_INPUT, port, pin);
/* Now, reconfigure the pin as an output */
fiobase = g_fiobase[port];
regval = getreg32(fiobase + LPC17_FIO_DIR_OFFSET);
regval |= (1 << pin);
putreg32(regval, fiobase + LPC17_FIO_DIR_OFFSET);
/* Check for open drain output */
if ((cfgset & GPIO_OPEN_DRAIN) != 0)
{
/* Set pull-up mode. This normally only applies to input pins, but does have
* meaning if the port is an open drain output.
*/
lpc17_pullup(cfgset, port, pin);
/* Select open drain output */
lpc17_setopendrain(port, pin);
}
/* Set the initial value of the output */
lpc17_gpiowrite(cfgset, ((cfgset & GPIO_VALUE) != GPIO_VALUE_ZERO));
return OK;
}
/****************************************************************************
* Name: lpc17_configalternate
*
* Description:
* Configure a GPIO alternate function pin based on bit-encoded description
* of the pin.
*
****************************************************************************/
static int lpc17_configalternate(lpc17_pinset_t cfgset, unsigned int port,
unsigned int pin, uint32_t alt)
{
/* First, configure the port as an input so that we have a known
* starting point and consistent behavior during the re-configuration.
*/
(void)lpc17_configinput(DEFAULT_INPUT, port, pin);
/* Set up PINSEL registers */
/* Configure as GPIO */
lpc17_pinsel(port, pin, alt);
/* Set pull-up mode */
lpc17_pullup(cfgset, port, pin);
/* Check for open drain output */
if ((cfgset & GPIO_OPEN_DRAIN) != 0)
{
/* Select open drain output */
lpc17_setopendrain(port, pin);
}
return OK;
}
/****************************************************************************
* Global Functions
****************************************************************************/
/****************************************************************************
* Name: lpc17_configgpio
*
* Description:
* Configure a GPIO pin based on bit-encoded description of the pin.
*
****************************************************************************/
int lpc17_configgpio(lpc17_pinset_t cfgset)
{
unsigned int port;
unsigned int pin;
int ret = -EINVAL;
/* Verify that this hardware supports the select GPIO port */
port = (cfgset & GPIO_PORT_MASK) >> GPIO_PORT_SHIFT;
if (port < GPIO_NPORTS)
{
/* Get the pin number and select the port configuration register for that pin */
pin = (cfgset & GPIO_PIN_MASK) >> GPIO_PIN_SHIFT;
/* Handle according to pin function */
switch (cfgset & GPIO_FUNC_MASK)
{
case GPIO_INPUT: /* GPIO input pin */
ret = lpc17_configinput(cfgset, port, pin);
break;
case GPIO_INTFE: /* GPIO interrupt falling edge */
case GPIO_INTRE: /* GPIO interrupt rising edge */
case GPIO_INTBOTH: /* GPIO interrupt both edges */
ret = lpc17_configinterrupt(cfgset, port, pin);
break;
case GPIO_OUTPUT: /* GPIO outpout pin */
ret = lpc17_configoutput(cfgset, port, pin);
break;
case GPIO_ALT1: /* Alternate function 1 */
ret = lpc17_configalternate(cfgset, port, pin, PINCONN_PINSEL_ALT1);
break;
case GPIO_ALT2: /* Alternate function 2 */
ret = lpc17_configalternate(cfgset, port, pin, PINCONN_PINSEL_ALT2);
break;
case GPIO_ALT3: /* Alternate function 3 */
ret = lpc17_configalternate(cfgset, port, pin, PINCONN_PINSEL_ALT3);
break;
default:
break;
}
}
return ret;
}
/****************************************************************************
* Name: lpc17_gpiowrite
*
* Description:
* Write one or zero to the selected GPIO pin
*
****************************************************************************/
void lpc17_gpiowrite(lpc17_pinset_t pinset, bool value)
{
uint32_t fiobase;
uint32_t offset;
unsigned int port;
unsigned int pin;
port = (pinset & GPIO_PORT_MASK) >> GPIO_PORT_SHIFT;
if (port < GPIO_NPORTS)
{
/* Get the port base address */
fiobase = g_fiobase[port];
/* Get the pin number */
pin = (pinset & GPIO_PIN_MASK) >> GPIO_PIN_SHIFT;
/* Set or clear the output on the pin */
if (value)
{
offset = LPC17_FIO_SET_OFFSET;
}
else
{
offset = LPC17_FIO_CLR_OFFSET;
}
putreg32((1 << pin), fiobase + offset);
}
}
/****************************************************************************
* Name: lpc17_gpioread
*
* Description:
* Read one or zero from the selected GPIO pin
*
****************************************************************************/
bool lpc17_gpioread(lpc17_pinset_t pinset)
{
uint32_t fiobase;
unsigned int port;
unsigned int pin;
port = (pinset & GPIO_PORT_MASK) >> GPIO_PORT_SHIFT;
if (port < GPIO_NPORTS)
{
/* Get the port base address */
fiobase = g_fiobase[port];
/* Get the pin number and return the input state of that pin */
pin = (pinset & GPIO_PIN_MASK) >> GPIO_PIN_SHIFT;
return ((getreg32(fiobase + LPC17_FIO_PIN_OFFSET) & (1 << pin)) != 0);
}
return false;
}
