mbed library sources
Dependents: frdm_kl05z_gpio_test
Fork of mbed-src by
targets/hal/TARGET_STM/TARGET_NUCLEO_L152RE/gpio_irq_api.c
- Committer:
- mbed_official
- Date:
- 2014-07-08
- Revision:
- 250:a49055e7a707
- Parent:
- 174:8bb9f3a33240
- Child:
- 251:de9a1e4ffd79
File content as of revision 250:a49055e7a707:
/* mbed Microcontroller Library ******************************************************************************* * Copyright (c) 2014, STMicroelectronics * All rights reserved. * * 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 of STMicroelectronics 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 HOLDER 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. ******************************************************************************* */ #include <stddef.h> #include "cmsis.h" #include "gpio_irq_api.h" #include "pinmap.h" #include "mbed_error.h" #define EDGE_NONE (0) #define EDGE_RISE (1) #define EDGE_FALL (2) #define EDGE_BOTH (3) #define CHANNEL_NUM (7) static uint32_t channel_ids[CHANNEL_NUM] = {0, 0, 0, 0, 0, 0, 0}; static uint32_t channel_gpio[CHANNEL_NUM] = {0, 0, 0, 0, 0, 0, 0}; static uint32_t channel_pin[CHANNEL_NUM] = {0, 0, 0, 0, 0, 0, 0}; static gpio_irq_handler irq_handler; static void handle_interrupt_in(uint32_t irq_index) { // Retrieve the gpio and pin that generate the irq GPIO_TypeDef *gpio = (GPIO_TypeDef *)(channel_gpio[irq_index]); uint32_t pin = (uint32_t)(1 << channel_pin[irq_index]); // Clear interrupt flag if (EXTI_GetITStatus(pin) != RESET) { EXTI_ClearITPendingBit(pin); } if (channel_ids[irq_index] == 0) return; // Check which edge has generated the irq if ((gpio->IDR & pin) == 0) { irq_handler(channel_ids[irq_index], IRQ_FALL); } else { irq_handler(channel_ids[irq_index], IRQ_RISE); } } // The irq_index is passed to the function static void gpio_irq0(void) { handle_interrupt_in(0); // EXTI line 0 } static void gpio_irq1(void) { handle_interrupt_in(1); // EXTI line 1 } static void gpio_irq2(void) { handle_interrupt_in(2); // EXTI line 2 } static void gpio_irq3(void) { handle_interrupt_in(3); // EXTI line 3 } static void gpio_irq4(void) { handle_interrupt_in(4); // EXTI line 4 } static void gpio_irq5(void) { handle_interrupt_in(5); // EXTI lines 5 to 9 } static void gpio_irq6(void) { handle_interrupt_in(6); // EXTI lines 10 to 15 } extern uint32_t Set_GPIO_Clock(uint32_t port_idx); int gpio_irq_init(gpio_irq_t *obj, PinName pin, gpio_irq_handler handler, uint32_t id) { IRQn_Type irq_n = (IRQn_Type)0; uint32_t vector = 0; uint32_t irq_index; if (pin == NC) return -1; uint32_t port_index = STM_PORT(pin); uint32_t pin_index = STM_PIN(pin); // Select irq number and interrupt routine switch (pin_index) { case 0: irq_n = EXTI0_IRQn; vector = (uint32_t)&gpio_irq0; irq_index = 0; break; case 1: irq_n = EXTI1_IRQn; vector = (uint32_t)&gpio_irq1; irq_index = 1; break; case 2: irq_n = EXTI2_IRQn; vector = (uint32_t)&gpio_irq2; irq_index = 2; break; case 3: irq_n = EXTI3_IRQn; vector = (uint32_t)&gpio_irq3; irq_index = 3; break; case 4: irq_n = EXTI4_IRQn; vector = (uint32_t)&gpio_irq4; irq_index = 4; break; case 5: case 6: case 7: case 8: case 9: irq_n = EXTI9_5_IRQn; vector = (uint32_t)&gpio_irq5; irq_index = 5; break; case 10: case 11: case 12: case 13: case 14: case 15: irq_n = EXTI15_10_IRQn; vector = (uint32_t)&gpio_irq6; irq_index = 6; break; default: error("InterruptIn error: pin not supported.\n"); return -1; } // Enable GPIO clock uint32_t gpio_add = Set_GPIO_Clock(port_index); // Enable SYSCFG clock RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE); // Connect EXTI line to pin SYSCFG_EXTILineConfig(port_index, pin_index); // Configure EXTI line EXTI_InitTypeDef EXTI_InitStructure; EXTI_InitStructure.EXTI_Line = (uint32_t)(1 << pin_index); EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; EXTI_InitStructure.EXTI_LineCmd = ENABLE; EXTI_Init(&EXTI_InitStructure); // Enable and set EXTI interrupt to the lowest priority NVIC_InitTypeDef NVIC_InitStructure; NVIC_InitStructure.NVIC_IRQChannel = irq_n; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); NVIC_SetVector(irq_n, vector); NVIC_EnableIRQ(irq_n); // Save informations for future use obj->irq_n = irq_n; obj->irq_index = irq_index; obj->event = EDGE_NONE; channel_ids[irq_index] = id; channel_gpio[irq_index] = gpio_add; channel_pin[irq_index] = pin_index; irq_handler = handler; return 0; } void gpio_irq_free(gpio_irq_t *obj) { channel_ids[obj->irq_index] = 0; channel_gpio[obj->irq_index] = 0; channel_pin[obj->irq_index] = 0; // Disable EXTI line EXTI_InitTypeDef EXTI_InitStructure; EXTI_StructInit(&EXTI_InitStructure); EXTI_Init(&EXTI_InitStructure); obj->event = EDGE_NONE; } void gpio_irq_set(gpio_irq_t *obj, gpio_irq_event event, uint32_t enable) { EXTI_InitTypeDef EXTI_InitStructure; uint32_t pin_index = channel_pin[obj->irq_index]; EXTI_InitStructure.EXTI_Line = (uint32_t)(1 << pin_index); EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; if (event == IRQ_RISE) { if ((obj->event == EDGE_FALL) || (obj->event == EDGE_BOTH)) { EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling; obj->event = EDGE_BOTH; } else { // NONE or RISE EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising; obj->event = EDGE_RISE; } } if (event == IRQ_FALL) { if ((obj->event == EDGE_RISE) || (obj->event == EDGE_BOTH)) { EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling; obj->event = EDGE_BOTH; } else { // NONE or FALL EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; obj->event = EDGE_FALL; } } if (enable) { EXTI_InitStructure.EXTI_LineCmd = ENABLE; } else { EXTI_InitStructure.EXTI_LineCmd = DISABLE; } EXTI_Init(&EXTI_InitStructure); } void gpio_irq_enable(gpio_irq_t *obj) { NVIC_EnableIRQ(obj->irq_n); } void gpio_irq_disable(gpio_irq_t *obj) { NVIC_DisableIRQ(obj->irq_n); obj->event = EDGE_NONE; }