/**************************************************************************** * arch/arm/src/stm32/stm32_exti_gpio.c * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. The * ASF licenses this file to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance with the * License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations * under the License. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include #include #include "arm_internal.h" #include "chip.h" #include "stm32_gpio.h" #include "stm32_exti.h" /**************************************************************************** * Private Types ****************************************************************************/ struct gpio_callback_s { xcpt_t callback; void *arg; }; /**************************************************************************** * Private Data ****************************************************************************/ /* Interrupt handlers attached to each EXTI */ static struct gpio_callback_s g_gpio_callbacks[16]; /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Interrupt Service Routines - Dispatchers ****************************************************************************/ static int stm32_exti0_isr(int irq, void *context, void *arg) { int ret = OK; /* Clear the pending interrupt */ putreg32(0x0001, STM32_EXTI_PR); /* And dispatch the interrupt to the handler */ if (g_gpio_callbacks[0].callback != NULL) { xcpt_t callback = g_gpio_callbacks[0].callback; void *cbarg = g_gpio_callbacks[0].arg; ret = callback(irq, context, cbarg); } return ret; } static int stm32_exti1_isr(int irq, void *context, void *arg) { int ret = OK; /* Clear the pending interrupt */ putreg32(0x0002, STM32_EXTI_PR); /* And dispatch the interrupt to the handler */ if (g_gpio_callbacks[1].callback != NULL) { xcpt_t callback = g_gpio_callbacks[1].callback; void *cbarg = g_gpio_callbacks[1].arg; ret = callback(irq, context, cbarg); } return ret; } static int stm32_exti2_isr(int irq, void *context, void *arg) { int ret = OK; /* Clear the pending interrupt */ putreg32(0x0004, STM32_EXTI_PR); /* And dispatch the interrupt to the handler */ if (g_gpio_callbacks[2].callback != NULL) { xcpt_t callback = g_gpio_callbacks[2].callback; void *cbarg = g_gpio_callbacks[2].arg; ret = callback(irq, context, cbarg); } return ret; } static int stm32_exti3_isr(int irq, void *context, void * arg) { int ret = OK; /* Clear the pending interrupt */ putreg32(0x0008, STM32_EXTI_PR); /* And dispatch the interrupt to the handler */ if (g_gpio_callbacks[3].callback != NULL) { xcpt_t callback = g_gpio_callbacks[3].callback; void *cbarg = g_gpio_callbacks[3].arg; ret = callback(irq, context, cbarg); } return ret; } static int stm32_exti4_isr(int irq, void *context, void *arg) { int ret = OK; /* Clear the pending interrupt */ putreg32(0x0010, STM32_EXTI_PR); /* And dispatch the interrupt to the handler */ if (g_gpio_callbacks[4].callback != NULL) { xcpt_t callback = g_gpio_callbacks[4].callback; void *cbarg = g_gpio_callbacks[4].arg; ret = callback(irq, context, cbarg); } return ret; } static int stm32_exti_multiisr(int irq, void *context, void *arg, int first, int last) { uint32_t pr; int pin; int ret = OK; /* Examine the state of each pin in the group */ pr = getreg32(STM32_EXTI_PR); /* And dispatch the interrupt to the handler */ for (pin = first; pin <= last; pin++) { /* Is an interrupt pending on this pin? */ uint32_t mask = (1 << pin); if ((pr & mask) != 0) { /* Clear the pending interrupt */ putreg32(mask, STM32_EXTI_PR); /* And dispatch the interrupt to the handler */ if (g_gpio_callbacks[pin].callback != NULL) { xcpt_t callback = g_gpio_callbacks[pin].callback; void *cbarg = g_gpio_callbacks[pin].arg; int tmp; tmp = callback(irq, context, cbarg); if (tmp < 0) { ret = tmp; } } } } return ret; } static int stm32_exti95_isr(int irq, void *context, void *arg) { return stm32_exti_multiisr(irq, context, arg, 5, 9); } static int stm32_exti1510_isr(int irq, void *context, void *arg) { return stm32_exti_multiisr(irq, context, arg, 10, 15); } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: stm32_gpiosetevent * * Description: * Sets/clears GPIO based event and interrupt triggers. * * Input Parameters: * - pinset: GPIO pin configuration * - risingedge: Enables interrupt on rising edges * - fallingedge: Enables interrupt on falling edges * - event: Generate event when set * - func: When non-NULL, generate interrupt * - arg: Argument passed to the interrupt callback * * Returned Value: * Zero (OK) on success; a negated errno value on failure indicating the * nature of the failure. * ****************************************************************************/ int stm32_gpiosetevent(uint32_t pinset, bool risingedge, bool fallingedge, bool event, xcpt_t func, void *arg) { struct gpio_callback_s *shared_cbs; uint32_t pin = pinset & GPIO_PIN_MASK; uint32_t exti = STM32_EXTI_BIT(pin); int irq; xcpt_t handler; int nshared; int i; /* Select the interrupt handler for this EXTI pin */ if (pin < 5) { irq = pin + STM32_IRQ_EXTI0; nshared = 1; shared_cbs = &g_gpio_callbacks[pin]; switch (pin) { case 0: handler = stm32_exti0_isr; break; case 1: handler = stm32_exti1_isr; break; case 2: handler = stm32_exti2_isr; break; case 3: handler = stm32_exti3_isr; break; default: handler = stm32_exti4_isr; break; } } else if (pin < 10) { irq = STM32_IRQ_EXTI95; handler = stm32_exti95_isr; shared_cbs = &g_gpio_callbacks[5]; nshared = 5; } else { irq = STM32_IRQ_EXTI1510; handler = stm32_exti1510_isr; shared_cbs = &g_gpio_callbacks[10]; nshared = 6; } /* Get the previous GPIO IRQ handler; Save the new IRQ handler. */ g_gpio_callbacks[pin].callback = func; g_gpio_callbacks[pin].arg = arg; /* Install external interrupt handlers */ if (func) { irq_attach(irq, handler, NULL); up_enable_irq(irq); } else { /* Only disable IRQ if shared handler does not have any active * callbacks. */ for (i = 0; i < nshared; i++) { if (shared_cbs[i].callback != NULL) { break; } } if (i == nshared) { up_disable_irq(irq); } } /* Configure GPIO, enable EXTI line enabled if event or interrupt is * enabled. */ if (event || func) { pinset |= GPIO_EXTI; } stm32_configgpio(pinset); /* Configure rising/falling edges */ modifyreg32(STM32_EXTI_RTSR, risingedge ? 0 : exti, risingedge ? exti : 0); modifyreg32(STM32_EXTI_FTSR, fallingedge ? 0 : exti, fallingedge ? exti : 0); /* Enable Events and Interrupts */ modifyreg32(STM32_EXTI_EMR, event ? 0 : exti, event ? exti : 0); modifyreg32(STM32_EXTI_IMR, func ? 0 : exti, func ? exti : 0); return OK; }