/**************************************************************************** * arch/arm/src/lpc17xx/lpc17_gpio.c * * Copyright (C) 2010-2011 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 #include #include #include #include #include #include "up_arch.h" #include "chip.h" #include "lpc17_gpio.h" #include "lpc17_pinconn.h" #include "lpc17_internal.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(uint16_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(uint16_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(uint16_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(uint16_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(uint16_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(uint16_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(uint16_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(uint16_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 0; }