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nuttx/arch/arm/src/lpc54xx/lpc54_gpio.c

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/****************************************************************************
* arch/arm/src/lpc54xx/lpc54_gpio.c
*
* Copyright (C) 2017 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/lpc54_iocon.h"
#include "chip/lpc54_gpio.h"
#include "lpc54_gpio.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Default input pin configuration */
#define PORTPIN_MASK (GPIO_PORT_MASK|GPIO_PIN_MASK)
/* Pin types */
#define PIN_TYPE_UNKNOWN 0
#define PIN_TYPED (1 << 0)
#define PIN_TYPEI (1 << 1)
#define PIN_TYPEA (1 << 2)
/* Helpers */
#define GPIO_PORTPIN_MASKGPIO_PORTPIN_MASK (GPIO_PORT_MASK | GPIO_PIN_MASK)
/****************************************************************************
* Private Data
****************************************************************************/
static const uint32_t g_typed_mask[LPC54_GPIO_NPORTS] =
{
IOCON_PIO0_TYPED_MASK,
IOCON_PIO1_TYPED_MASK,
IOCON_PIO2_TYPED_MASK,
IOCON_PIO3_TYPED_MASK,
IOCON_PIO4_TYPED_MASK,
IOCON_PIO5_TYPED_MASK,
};
static const uint32_t g_typei_mask[LPC54_GPIO_NPORTS] =
{
IOCON_PIO0_TYPEI_MASK,
IOCON_PIO1_TYPEI_MASK,
IOCON_PIO2_TYPEI_MASK,
IOCON_PIO3_TYPEI_MASK,
IOCON_PIO4_TYPEI_MASK,
IOCON_PIO5_TYPEI_MASK,
};
static const uint32_t g_typea_mask[LPC54_GPIO_NPORTS] =
{
IOCON_PIO0_TYPEA_MASK,
IOCON_PIO1_TYPEA_MASK,
IOCON_PIO2_TYPEA_MASK,
IOCON_PIO3_TYPEA_MASK,
IOCON_PIO4_TYPEA_MASK,
IOCON_PIO5_TYPEA_MASK,
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: lpc54_pintype
*
* Description:
* Get the LPC548x IOCON register mask.
*
* Type D: FUNC MODE INVERT DIGIMODE FILTEROFF SLEW OD
* Type I: FUNC I2CSLEW INVERT DIGIMODE FILTEROFF I2CDRIVE I2CFILTEROFF
* Type A: FUNC MODE INVERT DIGIMODE FILTEROFF OD
*
****************************************************************************/
static uint8_t lpc54_pintype(unsigned int port, unsigned int pin)
{
uint8_t pintype = 0;
if ((g_typed_mask[port] & (1 << pin)) != 0)
{
pintype |= PIN_TYPED;
}
if ((g_typei_mask[port] & (1 << pin)) != 0)
{
pintype |= PIN_TYPEI;
}
if ((g_typea_mask[port] & (1 << pin)) != 0)
{
pintype |= PIN_TYPEA;
}
return pintype;
}
/****************************************************************************
* Name: lpc54_setpinfunction
*
* Description:
* Select pin function.
*
****************************************************************************/
static void lpc54_setpinfunction(unsigned int port, unsigned int pin,
unsigned int value)
{
uintptr_t regaddr;
uint32_t regval;
regaddr = LPC54_IOCON_PIO(port, pin);
regval = getreg32(regaddr);
regval &= ~IOCON_FUNC_MASK;
regval |= (value << IOCON_FUNC_SHIFT);
putreg32(regval, regaddr);
}
/****************************************************************************
* Name: lpc54_gpio_input
*
* Description:
* Configure a GPIO input pin based on bit-encoded description of the pin.
*
****************************************************************************/
static inline void lpc54_gpio_input(unsigned int port, unsigned int pin)
{
uintptr_t regaddr;
uint32_t regval;
uint32_t pinmask = (1 << pin);
/* Set as input */
regaddr = LPC54_GPIO_DIR(port);
regval = getreg32(regaddr);
regval &= ~pinmask;
putreg32(regval, regaddr);
/* Configure as GPIO */
lpc54_setpinfunction(port, pin, IOCON_FUNC_GPIO);
}
/****************************************************************************
* Name: lpc54_gpio_output
*
* Description:
* Configure a GPIO output pin based on bit-encoded description of the pin.
*
****************************************************************************/
static inline void lpc54_gpio_output(lpc54_pinset_t cfgset,
unsigned int port, unsigned int pin)
{
uintptr_t regaddr;
uint32_t regval;
/* Configure the pin as an output */
regaddr = LPC54_GPIO_DIR(port);
regval = getreg32(regaddr);
regval |= (1 << pin);
putreg32(regval, regaddr);
/* Set the initial value of the output. Apparently this cannot be done
* before cofiguring the pin as an output. I don't see anyway to avoid
* glitch.
*/
lpc54_gpio_write(cfgset, ((cfgset & GPIO_VALUE) != GPIO_VALUE_ZERO));
}
/****************************************************************************
* Name: lpc54_gpio_alternate
*
* Description:
* Configure a GPIO alternate function pin based on bit-encoded description
* of the pin.
*
****************************************************************************/
static inline void lpc54_gpio_alternate(lpc54_pinset_t cfgset,
unsigned int port, unsigned int pin,
uint32_t alt)
{
/* Select the alternate pin function */
lpc54_setpinfunction(port, pin, alt);
}
/****************************************************************************
* Name: lpc54_gpio_iocon
*
* Description:
* Configure the pin IOCON register.
*
****************************************************************************/
static void lpc54_gpio_iocon(lpc54_pinset_t cfgset, unsigned int port,
unsigned int pin)
{
uintptr_t regaddr;
uint32_t iocon;
uint8_t pintype;
/* Configure pins for supported pin type(s):
*
* Type D: FUNC MODE INVERT DIGIMODE FILTEROFF SLEW OD
* Type I: FUNC I2CSLEW INVERT DIGIMODE FILTEROFF I2CDRIVE I2CFILTEROFF
* Type A: FUNC MODE INVERT DIGIMODE FILTEROFF OD
*/
pintype = lpc54_pintype(port, pin);
iocon = IOCON_FUNC(IOCON_FUNC_GPIO);
/* MODE: Type D and A only */
if ((pintype & (PIN_TYPED | PIN_TYPEA)) != 0)
{
uint32_t mode = (cfgset & GPIO_MODE_MASK) >> GPIO_MODE_SHIFT;
iocon |= mode << IOCON_MODE_SHIFT;
}
/* I2CSLEW: Type I only */
if ((pintype & PIN_TYPEI) != 0 && (cfgset & GPIO_I2CSLEW_MASK) != 0)
{
iocon |= IOCON_I2CSLEW_GPIO;
}
/* INVERT: All types */
if ((cfgset & GPIO_INVERT_MASK) != 0)
{
iocon |= IOCON_INVERT;
}
/* DIGIMODE: All types */
if ((cfgset & GPIO_DIGIMODE_MASK) != 0)
{
iocon |= IOCON_DIGIMODE_DIGITAL;
}
/* FILTEROFF: All types */
if ((cfgset & GPIO_FILTEROFF_MASK) != 0)
{
iocon |= IOCON_FILTEROFF_OFF;
}
/* SLEW: Type D only */
if ((pintype & PIN_TYPED) != 0 && (cfgset & GPIO_SLEW_MASK) != 0)
{
iocon |= IOCON_SLEW_FAST;
}
/* I2CDRIVE: Type I only */
if ((pintype & PIN_TYPEI) != 0 && (cfgset & GPIO_I2CDRIVE_MASK) != 0)
{
iocon |= IOCON_I2CDRIVE_HIGH;
}
/* OD: Type D and A only */
if ((pintype & (PIN_TYPED | PIN_TYPEA)) != 0 &&
(cfgset & GPIO_OD_MASK) != 0)
{
iocon |= IOCON_OD_OPENDRAIN;
}
/* I2CFILTEROFF: Type I only */
if ((pintype & PIN_TYPEI) != 0 && (cfgset & GPIO_I2CFILTEROFF_MASK) != 0)
{
iocon |= IOCON_I2CFILTEROFF_OFF;
}
/* Now write the IOCON settings */
regaddr = LPC54_IOCON_PIO(port, pin);
putreg32(iocon, regaddr);
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: lpc54_gpio_config
*
* Description:
* Configure a GPIO pin based on bit-encoded description of the pin.
*
****************************************************************************/
int lpc54_gpio_config(lpc54_pinset_t cfgset)
{
unsigned int port;
unsigned int pin;
/* Verify that this hardware supports the select GPIO port */
port = (cfgset & GPIO_PORT_MASK) >> GPIO_PORT_SHIFT;
if (port < LPC54_GPIO_NPORTS)
{
/* Get the pin number and select the port configuration register for
* that pin.
*/
pin = (cfgset & GPIO_PIN_MASK) >> GPIO_PIN_SHIFT;
/* First, configure the port as a generic input so that we have a
* known starting point and consistent behavior during the re-
* configuration.
*/
lpc54_gpio_input(port, pin);
/* Set the IOCON bits */
lpc54_gpio_iocon(cfgset, port, pin);
/* Handle according to pin function */
switch (cfgset & GPIO_FUNC_MASK)
{
case GPIO_INPUT: /* GPIO input pin */
break; /* Already configured */
#ifdef CONFIG_LPC54_GPIOIRQ
case GPIO_INTFE: /* GPIO interrupt falling edge */
case GPIO_INTRE: /* GPIO interrupt rising edge */
case GPIO_INTBOTH: /* GPIO interrupt both edges */
case GPIO_INTLOW: /* GPIO interrupt low level */
case GPIO_INTHIGH: /* GPIO interrupt high level */
lpc54_gpio_interrupt(cfgset);
break;
#endif
case GPIO_OUTPUT: /* GPIO outpout pin */
lpc54_gpio_output(cfgset, port, pin);
break;
case GPIO_ALT1: /* Alternate function 1 */
lpc54_gpio_alternate(cfgset, port, pin, IOCON_FUNC_ALT1);
break;
case GPIO_ALT2: /* Alternate function 2 */
lpc54_gpio_alternate(cfgset, port, pin, IOCON_FUNC_ALT2);
break;
case GPIO_ALT3: /* Alternate function 3 */
lpc54_gpio_alternate(cfgset, port, pin, IOCON_FUNC_ALT3);
break;
case GPIO_ALT4: /* Alternate function 4 */
lpc54_gpio_alternate(cfgset, port, pin, IOCON_FUNC_ALT4);
break;
case GPIO_ALT5: /* Alternate function 5 */
lpc54_gpio_alternate(cfgset, port, pin, IOCON_FUNC_ALT5);
break;
case GPIO_ALT6: /* Alternate function 6 */
lpc54_gpio_alternate(cfgset, port, pin, IOCON_FUNC_ALT6);
break;
case GPIO_ALT7: /* Alternate function 7 */
lpc54_gpio_alternate(cfgset, port, pin, IOCON_FUNC_ALT7);
break;
default:
return -EINVAL;
}
}
return OK;
}
/****************************************************************************
* Name: lpc54_gpio_write
*
* Description:
* Write one or zero to the selected GPIO pin
*
****************************************************************************/
void lpc54_gpio_write(lpc54_pinset_t pinset, bool value)
{
unsigned int portpin = pinset & PORTPIN_MASK;
putreg8((uint32_t)value, LPC54_GPIO_B(portpin));
}
/****************************************************************************
* Name: lpc54_gpio_read
*
* Description:
* Read one or zero from the selected GPIO pin
*
****************************************************************************/
bool lpc54_gpio_read(lpc54_pinset_t pinset)
{
unsigned int portpin = pinset & PORTPIN_MASK;
return (bool)getreg8(LPC54_GPIO_B(portpin));
}
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