/**************************************************************************** * boards/arm/kinetis/freedom-k66f/src/k66_buttons.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 "chip.h" #include "kinetis.h" #include "freedom-k66f.h" #ifdef CONFIG_ARCH_BUTTONS /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /* Two push buttons, SW2 and SW3, are available on FRDM-K66F board, where SW2 * is connected to PTC6 and SW3 is connected to PTA4. * Besides the general purpose input/output functions, SW2 and SW3 can be * low-power wake up signal. * Also, only SW3 can be a non-maskable interrupt. * * Switch GPIO Function * -------- --------------------------------------------------------------- * SW2 PTD11/LLWU_P25/SPI2_PCS0/SDHC0_CLKIN/LPUART0_CTS/FB_A19 * SW3 PTA10/LLWU_P22/FTM2_CH0/MII0_RXD2/FTM2_QD_PHA/TPM2_CH0/TRACE_D0 */ /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: board_button_initialize * * Description: * board_button_initialize() must be called to initialize button resources. * After that, board_buttons() may be called to collect the current state * of all buttons or board_button_irq() may be called to register button * interrupt handlers. * ****************************************************************************/ uint32_t board_button_initialize(void) { /* Configure the two buttons as inputs */ kinetis_pinconfig(GPIO_SW2); kinetis_pinconfig(GPIO_SW3); return NUM_BUTTONS; } /**************************************************************************** * Name: board_buttons ****************************************************************************/ uint32_t board_buttons(void) { uint32_t ret = 0; if (kinetis_gpioread(GPIO_SW2)) { ret |= BUTTON_SW2_BIT; } if (kinetis_gpioread(GPIO_SW3)) { ret |= BUTTON_SW3_BIT; } return ret; } /**************************************************************************** * Button support. * * Description: * board_button_initialize() must be called to initialize button * resources. After that, board_buttons() may be called to collect the * current state of all buttons or board_button_irq() may be called to * register button interrupt handlers. * * After board_button_initialize() has been called, board_buttons() may * be called to collect the state of all buttons. board_buttons() returns * an 32-bit bit set with each bit associated with a button. See the * BUTTON_*_BIT and JOYSTICK_*_BIT definitions in board.h for the meaning * of each bit. * * board_button_irq() may be called to register an interrupt handler that * will be called when a button is depressed or released. The ID value is * a button enumeration value that uniquely identifies a button resource. * See the BUTTON_* and JOYSTICK_* definitions in board.h for the meaning * of enumeration value. * ****************************************************************************/ #ifdef CONFIG_ARCH_IRQBUTTONS int board_button_irq(int id, xcpt_t irqhandler, void *arg) { uint32_t pinset; int ret; /* Map the button id to the GPIO bit set. */ if (id == BUTTON_SW2) { pinset = GPIO_SW2; } else if (id == BUTTON_SW3) { pinset = GPIO_SW3; } else { return -EINVAL; } /* The button has already been configured as an interrupting input (by * board_button_initialize() above). * * Attach the new button handler. */ ret = kinetis_pinirqattach(pinset, irqhandler, NULL); if (ret >= 0) { /* Then make sure that interrupts are enabled on the pin */ kinetis_pinirqenable(pinset); } return ret; } #endif #endif /* CONFIG_ARCH_BUTTONS */