mbed library sources
Dependents: frdm_kl05z_gpio_test
Fork of mbed-src by
targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/gpio_irq_api.c
- Committer:
- mbed_official
- Date:
- 2013-12-17
- Revision:
- 60:142c6c6f5949
- Child:
- 70:c1fbde68b492
File content as of revision 60:142c6c6f5949:
/* mbed Microcontroller Library * Copyright (c) 2006-2013 ARM Limited * * Licensed 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. */ #include <stddef.h> #include "cmsis.h" #include "gpio_irq_api.h" #include "error.h" #define EDGE_NONE (0) #define EDGE_RISE (1) #define EDGE_FALL (2) #define EDGE_BOTH (3) #define CHANNEL_NUM (16) static uint32_t channel_ids[CHANNEL_NUM] = {0}; static gpio_irq_handler irq_handler; static void handle_interrupt_in(uint32_t channel) { if (channel_ids[channel] == 0) return; uint32_t exti_line = (uint32_t)(1 << channel); if (EXTI_GetITStatus(exti_line) != RESET) { EXTI_ClearITPendingBit(exti_line); } // Warning: // On this device we don't know if a rising or falling event occured. // In case both rise and fall events are set, only the FALL event will be reported. if (EXTI->FTSR & (uint32_t)(1 << channel)) { irq_handler(channel_ids[channel], IRQ_FALL); } else { irq_handler(channel_ids[channel], IRQ_RISE); } } static void gpio_irq0(void) {handle_interrupt_in(0);} static void gpio_irq1(void) {handle_interrupt_in(1);} static void gpio_irq2(void) {handle_interrupt_in(2);} static void gpio_irq3(void) {handle_interrupt_in(3);} static void gpio_irq4(void) {handle_interrupt_in(4);} static void gpio_irq5(void) {handle_interrupt_in(5);} static void gpio_irq6(void) {handle_interrupt_in(6);} static void gpio_irq7(void) {handle_interrupt_in(7);} static void gpio_irq8(void) {handle_interrupt_in(8);} static void gpio_irq9(void) {handle_interrupt_in(9);} static void gpio_irq10(void) {handle_interrupt_in(10);} static void gpio_irq11(void) {handle_interrupt_in(11);} static void gpio_irq12(void) {handle_interrupt_in(12);} static void gpio_irq13(void) {handle_interrupt_in(13);} static void gpio_irq14(void) {handle_interrupt_in(14);} static void gpio_irq15(void) {handle_interrupt_in(15);} 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; if (pin == NC) return -1; uint32_t pin_number = (uint32_t)pin; uint32_t pin_index = (pin_number & 0xF); uint32_t port_index = (pin_number >> 4); // Select irq number and vector switch (pin_index) { case 0: irq_n = EXTI0_IRQn; vector = (uint32_t)&gpio_irq0; break; case 1: irq_n = EXTI1_IRQn; vector = (uint32_t)&gpio_irq1; break; case 2: irq_n = EXTI2_IRQn; vector = (uint32_t)&gpio_irq2; break; case 3: irq_n = EXTI3_IRQn; vector = (uint32_t)&gpio_irq3; break; case 4: irq_n = EXTI4_IRQn; vector = (uint32_t)&gpio_irq4; break; case 5: irq_n = EXTI9_5_IRQn; vector = (uint32_t)&gpio_irq5; break; case 6: irq_n = EXTI9_5_IRQn; vector = (uint32_t)&gpio_irq6; break; case 7: irq_n = EXTI9_5_IRQn; vector = (uint32_t)&gpio_irq7; break; case 8: irq_n = EXTI9_5_IRQn; vector = (uint32_t)&gpio_irq8; break; case 9: irq_n = EXTI9_5_IRQn; vector = (uint32_t)&gpio_irq9; break; case 10: irq_n = EXTI15_10_IRQn; vector = (uint32_t)&gpio_irq10; break; case 11: irq_n = EXTI15_10_IRQn; vector = (uint32_t)&gpio_irq11; break; case 12: irq_n = EXTI15_10_IRQn; vector = (uint32_t)&gpio_irq12; break; case 13: irq_n = EXTI15_10_IRQn; vector = (uint32_t)&gpio_irq13; break; case 14: irq_n = EXTI15_10_IRQn; vector = (uint32_t)&gpio_irq14; break; case 15: irq_n = EXTI15_10_IRQn; vector = (uint32_t)&gpio_irq15; break; default: return -1; } // Enable GPIO and AFIO clocks RCC_APB2PeriphClockCmd((uint32_t)(RCC_APB2Periph_GPIOA << port_index), ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE); // Connect EXTI line to pin GPIO_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 for future use obj->ch = pin_index; obj->irq_n = irq_n; obj->event = EDGE_NONE; channel_ids[obj->ch] = id; irq_handler = handler; return 0; } void gpio_irq_free(gpio_irq_t *obj) { channel_ids[obj->ch] = 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; EXTI_InitStructure.EXTI_Line = (uint32_t)(1 << obj->ch); 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; }