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mbed/drivers/PortIn.h@0:d6c9b09b4042, 2020-12-02 (annotated)

Committer:
annieluo2
Date:
Wed Dec 02 18:02:03 2020 +0000
Revision:
0:d6c9b09b4042
boo

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annieluo2 0:d6c9b09b4042 1 /* mbed Microcontroller Library
annieluo2 0:d6c9b09b4042 2 * Copyright (c) 2006-2013 ARM Limited
annieluo2 0:d6c9b09b4042 3 *
annieluo2 0:d6c9b09b4042 4 * Licensed under the Apache License, Version 2.0 (the "License");
annieluo2 0:d6c9b09b4042 5 * you may not use this file except in compliance with the License.
annieluo2 0:d6c9b09b4042 6 * You may obtain a copy of the License at
annieluo2 0:d6c9b09b4042 7 *
annieluo2 0:d6c9b09b4042 8 * http://www.apache.org/licenses/LICENSE-2.0
annieluo2 0:d6c9b09b4042 9 *
annieluo2 0:d6c9b09b4042 10 * Unless required by applicable law or agreed to in writing, software
annieluo2 0:d6c9b09b4042 11 * distributed under the License is distributed on an "AS IS" BASIS,
annieluo2 0:d6c9b09b4042 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
annieluo2 0:d6c9b09b4042 13 * See the License for the specific language governing permissions and
annieluo2 0:d6c9b09b4042 14 * limitations under the License.
annieluo2 0:d6c9b09b4042 15 */
annieluo2 0:d6c9b09b4042 16 #ifndef MBED_PORTIN_H
annieluo2 0:d6c9b09b4042 17 #define MBED_PORTIN_H
annieluo2 0:d6c9b09b4042 18
annieluo2 0:d6c9b09b4042 19 #include "platform/platform.h"
annieluo2 0:d6c9b09b4042 20
annieluo2 0:d6c9b09b4042 21 #if DEVICE_PORTIN
annieluo2 0:d6c9b09b4042 22
annieluo2 0:d6c9b09b4042 23 #include "hal/port_api.h"
annieluo2 0:d6c9b09b4042 24 #include "platform/critical.h"
annieluo2 0:d6c9b09b4042 25
annieluo2 0:d6c9b09b4042 26 namespace mbed {
annieluo2 0:d6c9b09b4042 27 /** \addtogroup drivers */
annieluo2 0:d6c9b09b4042 28 /** @{*/
annieluo2 0:d6c9b09b4042 29
annieluo2 0:d6c9b09b4042 30 /** A multiple pin digital input
annieluo2 0:d6c9b09b4042 31 *
annieluo2 0:d6c9b09b4042 32 * @Note Synchronization level: Interrupt safe
annieluo2 0:d6c9b09b4042 33 *
annieluo2 0:d6c9b09b4042 34 * Example:
annieluo2 0:d6c9b09b4042 35 * @code
annieluo2 0:d6c9b09b4042 36 * // Switch on an LED if any of mbed pins 21-26 is high
annieluo2 0:d6c9b09b4042 37 *
annieluo2 0:d6c9b09b4042 38 * #include "mbed.h"
annieluo2 0:d6c9b09b4042 39 *
annieluo2 0:d6c9b09b4042 40 * PortIn p(Port2, 0x0000003F); // p21-p26
annieluo2 0:d6c9b09b4042 41 * DigitalOut ind(LED4);
annieluo2 0:d6c9b09b4042 42 *
annieluo2 0:d6c9b09b4042 43 * int main() {
annieluo2 0:d6c9b09b4042 44 * while(1) {
annieluo2 0:d6c9b09b4042 45 * int pins = p.read();
annieluo2 0:d6c9b09b4042 46 * if(pins) {
annieluo2 0:d6c9b09b4042 47 * ind = 1;
annieluo2 0:d6c9b09b4042 48 * } else {
annieluo2 0:d6c9b09b4042 49 * ind = 0;
annieluo2 0:d6c9b09b4042 50 * }
annieluo2 0:d6c9b09b4042 51 * }
annieluo2 0:d6c9b09b4042 52 * }
annieluo2 0:d6c9b09b4042 53 * @endcode
annieluo2 0:d6c9b09b4042 54 */
annieluo2 0:d6c9b09b4042 55 class PortIn {
annieluo2 0:d6c9b09b4042 56 public:
annieluo2 0:d6c9b09b4042 57
annieluo2 0:d6c9b09b4042 58 /** Create an PortIn, connected to the specified port
annieluo2 0:d6c9b09b4042 59 *
annieluo2 0:d6c9b09b4042 60 * @param port Port to connect to (Port0-Port5)
annieluo2 0:d6c9b09b4042 61 * @param mask A bitmask to identify which bits in the port should be included (0 - ignore)
annieluo2 0:d6c9b09b4042 62 */
annieluo2 0:d6c9b09b4042 63 PortIn(PortName port, int mask = 0xFFFFFFFF) {
annieluo2 0:d6c9b09b4042 64 core_util_critical_section_enter();
annieluo2 0:d6c9b09b4042 65 port_init(&_port, port, mask, PIN_INPUT);
annieluo2 0:d6c9b09b4042 66 core_util_critical_section_exit();
annieluo2 0:d6c9b09b4042 67 }
annieluo2 0:d6c9b09b4042 68
annieluo2 0:d6c9b09b4042 69 /** Read the value currently output on the port
annieluo2 0:d6c9b09b4042 70 *
annieluo2 0:d6c9b09b4042 71 * @returns
annieluo2 0:d6c9b09b4042 72 * An integer with each bit corresponding to associated port pin setting
annieluo2 0:d6c9b09b4042 73 */
annieluo2 0:d6c9b09b4042 74 int read() {
annieluo2 0:d6c9b09b4042 75 return port_read(&_port);
annieluo2 0:d6c9b09b4042 76 }
annieluo2 0:d6c9b09b4042 77
annieluo2 0:d6c9b09b4042 78 /** Set the input pin mode
annieluo2 0:d6c9b09b4042 79 *
annieluo2 0:d6c9b09b4042 80 * @param mode PullUp, PullDown, PullNone, OpenDrain
annieluo2 0:d6c9b09b4042 81 */
annieluo2 0:d6c9b09b4042 82 void mode(PinMode mode) {
annieluo2 0:d6c9b09b4042 83 core_util_critical_section_enter();
annieluo2 0:d6c9b09b4042 84 port_mode(&_port, mode);
annieluo2 0:d6c9b09b4042 85 core_util_critical_section_exit();
annieluo2 0:d6c9b09b4042 86 }
annieluo2 0:d6c9b09b4042 87
annieluo2 0:d6c9b09b4042 88 /** A shorthand for read()
annieluo2 0:d6c9b09b4042 89 */
annieluo2 0:d6c9b09b4042 90 operator int() {
annieluo2 0:d6c9b09b4042 91 return read();
annieluo2 0:d6c9b09b4042 92 }
annieluo2 0:d6c9b09b4042 93
annieluo2 0:d6c9b09b4042 94 private:
annieluo2 0:d6c9b09b4042 95 port_t _port;
annieluo2 0:d6c9b09b4042 96 };
annieluo2 0:d6c9b09b4042 97
annieluo2 0:d6c9b09b4042 98 } // namespace mbed
annieluo2 0:d6c9b09b4042 99
annieluo2 0:d6c9b09b4042 100 #endif
annieluo2 0:d6c9b09b4042 101
annieluo2 0:d6c9b09b4042 102 #endif
annieluo2 0:d6c9b09b4042 103
annieluo2 0:d6c9b09b4042 104 /** @}*/