The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.
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mbed 2
This is the mbed 2 library. If you'd like to learn about Mbed OS please see the mbed-os docs.
drivers/PwmOut.h@140:97feb9bacc10, 2017-04-12 (annotated)
- Committer:
- <>
- Date:
- Wed Apr 12 16:07:08 2017 +0100
- Revision:
- 140:97feb9bacc10
- Parent:
- 138:093f2bd7b9eb
- Child:
- 145:64910690c574
Release 140 of the mbed library
Ports for Upcoming Targets
3841: Add nRf52840 target https://github.com/ARMmbed/mbed-os/pull/3841
3992: Introducing UBLOX_C030 platform. https://github.com/ARMmbed/mbed-os/pull/3992
Fixes and Changes
3951: [NUCLEO_F303ZE] Correct ARDUINO pin https://github.com/ARMmbed/mbed-os/pull/3951
4021: Fixing a macro to detect when RTOS was in use for the NRF52840_DK https://github.com/ARMmbed/mbed-os/pull/4021
3979: KW24D: Add missing SPI defines and Arduino connector definitions https://github.com/ARMmbed/mbed-os/pull/3979
3990: UBLOX_C027: construct a ticker-based wait, rather than calling wait_ms(), in the https://github.com/ARMmbed/mbed-os/pull/3990
4003: Fixed OBOE in async serial tx for NRF52 target, fixes #4002 https://github.com/ARMmbed/mbed-os/pull/4003
4012: STM32: Correct I2C master error handling https://github.com/ARMmbed/mbed-os/pull/4012
4020: NUCLEO_L011K4 remove unsupported tool chain files https://github.com/ARMmbed/mbed-os/pull/4020
4065: K66F: Move bss section to m_data_2 Section https://github.com/ARMmbed/mbed-os/pull/4065
4014: Issue 3763: Reduce heap allocation in the GCC linker file https://github.com/ARMmbed/mbed-os/pull/4014
4030: [STM32L0] reduce IAR heap and stack size for small targets https://github.com/ARMmbed/mbed-os/pull/4030
4109: NUCLEO_L476RG : minor serial pin update https://github.com/ARMmbed/mbed-os/pull/4109
3982: Ticker - kl25z bugfix for handling events in the past https://github.com/ARMmbed/mbed-os/pull/3982
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
<> | 128:9bcdf88f62b0 | 1 | /* mbed Microcontroller Library |
<> | 128:9bcdf88f62b0 | 2 | * Copyright (c) 2006-2013 ARM Limited |
<> | 128:9bcdf88f62b0 | 3 | * |
<> | 128:9bcdf88f62b0 | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
<> | 128:9bcdf88f62b0 | 5 | * you may not use this file except in compliance with the License. |
<> | 128:9bcdf88f62b0 | 6 | * You may obtain a copy of the License at |
<> | 128:9bcdf88f62b0 | 7 | * |
<> | 128:9bcdf88f62b0 | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
<> | 128:9bcdf88f62b0 | 9 | * |
<> | 128:9bcdf88f62b0 | 10 | * Unless required by applicable law or agreed to in writing, software |
<> | 128:9bcdf88f62b0 | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
<> | 128:9bcdf88f62b0 | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
<> | 128:9bcdf88f62b0 | 13 | * See the License for the specific language governing permissions and |
<> | 128:9bcdf88f62b0 | 14 | * limitations under the License. |
<> | 128:9bcdf88f62b0 | 15 | */ |
<> | 128:9bcdf88f62b0 | 16 | #ifndef MBED_PWMOUT_H |
<> | 128:9bcdf88f62b0 | 17 | #define MBED_PWMOUT_H |
<> | 128:9bcdf88f62b0 | 18 | |
<> | 128:9bcdf88f62b0 | 19 | #include "platform/platform.h" |
<> | 128:9bcdf88f62b0 | 20 | |
<> | 128:9bcdf88f62b0 | 21 | #if DEVICE_PWMOUT |
<> | 128:9bcdf88f62b0 | 22 | #include "hal/pwmout_api.h" |
<> | 138:093f2bd7b9eb | 23 | #include "platform/mbed_critical.h" |
<> | 128:9bcdf88f62b0 | 24 | |
<> | 128:9bcdf88f62b0 | 25 | namespace mbed { |
<> | 128:9bcdf88f62b0 | 26 | /** \addtogroup drivers */ |
<> | 128:9bcdf88f62b0 | 27 | /** @{*/ |
<> | 128:9bcdf88f62b0 | 28 | |
<> | 128:9bcdf88f62b0 | 29 | /** A pulse-width modulation digital output |
<> | 128:9bcdf88f62b0 | 30 | * |
<> | 128:9bcdf88f62b0 | 31 | * @Note Synchronization level: Interrupt safe |
<> | 128:9bcdf88f62b0 | 32 | * |
<> | 128:9bcdf88f62b0 | 33 | * Example |
<> | 128:9bcdf88f62b0 | 34 | * @code |
<> | 128:9bcdf88f62b0 | 35 | * // Fade a led on. |
<> | 128:9bcdf88f62b0 | 36 | * #include "mbed.h" |
<> | 128:9bcdf88f62b0 | 37 | * |
<> | 128:9bcdf88f62b0 | 38 | * PwmOut led(LED1); |
<> | 128:9bcdf88f62b0 | 39 | * |
<> | 128:9bcdf88f62b0 | 40 | * int main() { |
<> | 128:9bcdf88f62b0 | 41 | * while(1) { |
<> | 128:9bcdf88f62b0 | 42 | * led = led + 0.01; |
<> | 128:9bcdf88f62b0 | 43 | * wait(0.2); |
<> | 128:9bcdf88f62b0 | 44 | * if(led == 1.0) { |
<> | 128:9bcdf88f62b0 | 45 | * led = 0; |
<> | 128:9bcdf88f62b0 | 46 | * } |
<> | 128:9bcdf88f62b0 | 47 | * } |
<> | 128:9bcdf88f62b0 | 48 | * } |
<> | 128:9bcdf88f62b0 | 49 | * @endcode |
<> | 128:9bcdf88f62b0 | 50 | * |
<> | 128:9bcdf88f62b0 | 51 | * @note |
<> | 128:9bcdf88f62b0 | 52 | * On the LPC1768 and LPC2368, the PWMs all share the same |
<> | 128:9bcdf88f62b0 | 53 | * period - if you change the period for one, you change it for all. |
<> | 128:9bcdf88f62b0 | 54 | * Although routines that change the period maintain the duty cycle |
<> | 128:9bcdf88f62b0 | 55 | * for its PWM, all other PWMs will require their duty cycle to be |
<> | 128:9bcdf88f62b0 | 56 | * refreshed. |
<> | 128:9bcdf88f62b0 | 57 | */ |
<> | 128:9bcdf88f62b0 | 58 | class PwmOut { |
<> | 128:9bcdf88f62b0 | 59 | |
<> | 128:9bcdf88f62b0 | 60 | public: |
<> | 128:9bcdf88f62b0 | 61 | |
<> | 128:9bcdf88f62b0 | 62 | /** Create a PwmOut connected to the specified pin |
<> | 128:9bcdf88f62b0 | 63 | * |
<> | 128:9bcdf88f62b0 | 64 | * @param pin PwmOut pin to connect to |
<> | 128:9bcdf88f62b0 | 65 | */ |
<> | 128:9bcdf88f62b0 | 66 | PwmOut(PinName pin) { |
<> | 128:9bcdf88f62b0 | 67 | core_util_critical_section_enter(); |
<> | 128:9bcdf88f62b0 | 68 | pwmout_init(&_pwm, pin); |
<> | 128:9bcdf88f62b0 | 69 | core_util_critical_section_exit(); |
<> | 128:9bcdf88f62b0 | 70 | } |
<> | 128:9bcdf88f62b0 | 71 | |
<> | 128:9bcdf88f62b0 | 72 | /** Set the ouput duty-cycle, specified as a percentage (float) |
<> | 128:9bcdf88f62b0 | 73 | * |
<> | 128:9bcdf88f62b0 | 74 | * @param value A floating-point value representing the output duty-cycle, |
<> | 128:9bcdf88f62b0 | 75 | * specified as a percentage. The value should lie between |
<> | 128:9bcdf88f62b0 | 76 | * 0.0f (representing on 0%) and 1.0f (representing on 100%). |
<> | 128:9bcdf88f62b0 | 77 | * Values outside this range will be saturated to 0.0f or 1.0f. |
<> | 128:9bcdf88f62b0 | 78 | */ |
<> | 128:9bcdf88f62b0 | 79 | void write(float value) { |
<> | 128:9bcdf88f62b0 | 80 | core_util_critical_section_enter(); |
<> | 128:9bcdf88f62b0 | 81 | pwmout_write(&_pwm, value); |
<> | 128:9bcdf88f62b0 | 82 | core_util_critical_section_exit(); |
<> | 128:9bcdf88f62b0 | 83 | } |
<> | 128:9bcdf88f62b0 | 84 | |
<> | 128:9bcdf88f62b0 | 85 | /** Return the current output duty-cycle setting, measured as a percentage (float) |
<> | 128:9bcdf88f62b0 | 86 | * |
<> | 128:9bcdf88f62b0 | 87 | * @returns |
<> | 128:9bcdf88f62b0 | 88 | * A floating-point value representing the current duty-cycle being output on the pin, |
<> | 128:9bcdf88f62b0 | 89 | * measured as a percentage. The returned value will lie between |
<> | 128:9bcdf88f62b0 | 90 | * 0.0f (representing on 0%) and 1.0f (representing on 100%). |
<> | 128:9bcdf88f62b0 | 91 | * |
<> | 128:9bcdf88f62b0 | 92 | * @note |
<> | 128:9bcdf88f62b0 | 93 | * This value may not match exactly the value set by a previous <write>. |
<> | 128:9bcdf88f62b0 | 94 | */ |
<> | 128:9bcdf88f62b0 | 95 | float read() { |
<> | 128:9bcdf88f62b0 | 96 | core_util_critical_section_enter(); |
<> | 128:9bcdf88f62b0 | 97 | float val = pwmout_read(&_pwm); |
<> | 128:9bcdf88f62b0 | 98 | core_util_critical_section_exit(); |
<> | 128:9bcdf88f62b0 | 99 | return val; |
<> | 128:9bcdf88f62b0 | 100 | } |
<> | 128:9bcdf88f62b0 | 101 | |
<> | 128:9bcdf88f62b0 | 102 | /** Set the PWM period, specified in seconds (float), keeping the duty cycle the same. |
<> | 128:9bcdf88f62b0 | 103 | * |
<> | 128:9bcdf88f62b0 | 104 | * @note |
<> | 128:9bcdf88f62b0 | 105 | * The resolution is currently in microseconds; periods smaller than this |
<> | 128:9bcdf88f62b0 | 106 | * will be set to zero. |
<> | 128:9bcdf88f62b0 | 107 | */ |
<> | 128:9bcdf88f62b0 | 108 | void period(float seconds) { |
<> | 128:9bcdf88f62b0 | 109 | core_util_critical_section_enter(); |
<> | 128:9bcdf88f62b0 | 110 | pwmout_period(&_pwm, seconds); |
<> | 128:9bcdf88f62b0 | 111 | core_util_critical_section_exit(); |
<> | 128:9bcdf88f62b0 | 112 | } |
<> | 128:9bcdf88f62b0 | 113 | |
<> | 128:9bcdf88f62b0 | 114 | /** Set the PWM period, specified in milli-seconds (int), keeping the duty cycle the same. |
<> | 128:9bcdf88f62b0 | 115 | */ |
<> | 128:9bcdf88f62b0 | 116 | void period_ms(int ms) { |
<> | 128:9bcdf88f62b0 | 117 | core_util_critical_section_enter(); |
<> | 128:9bcdf88f62b0 | 118 | pwmout_period_ms(&_pwm, ms); |
<> | 128:9bcdf88f62b0 | 119 | core_util_critical_section_exit(); |
<> | 128:9bcdf88f62b0 | 120 | } |
<> | 128:9bcdf88f62b0 | 121 | |
<> | 128:9bcdf88f62b0 | 122 | /** Set the PWM period, specified in micro-seconds (int), keeping the duty cycle the same. |
<> | 128:9bcdf88f62b0 | 123 | */ |
<> | 128:9bcdf88f62b0 | 124 | void period_us(int us) { |
<> | 128:9bcdf88f62b0 | 125 | core_util_critical_section_enter(); |
<> | 128:9bcdf88f62b0 | 126 | pwmout_period_us(&_pwm, us); |
<> | 128:9bcdf88f62b0 | 127 | core_util_critical_section_exit(); |
<> | 128:9bcdf88f62b0 | 128 | } |
<> | 128:9bcdf88f62b0 | 129 | |
<> | 128:9bcdf88f62b0 | 130 | /** Set the PWM pulsewidth, specified in seconds (float), keeping the period the same. |
<> | 128:9bcdf88f62b0 | 131 | */ |
<> | 128:9bcdf88f62b0 | 132 | void pulsewidth(float seconds) { |
<> | 128:9bcdf88f62b0 | 133 | core_util_critical_section_enter(); |
<> | 128:9bcdf88f62b0 | 134 | pwmout_pulsewidth(&_pwm, seconds); |
<> | 128:9bcdf88f62b0 | 135 | core_util_critical_section_exit(); |
<> | 128:9bcdf88f62b0 | 136 | } |
<> | 128:9bcdf88f62b0 | 137 | |
<> | 128:9bcdf88f62b0 | 138 | /** Set the PWM pulsewidth, specified in milli-seconds (int), keeping the period the same. |
<> | 128:9bcdf88f62b0 | 139 | */ |
<> | 128:9bcdf88f62b0 | 140 | void pulsewidth_ms(int ms) { |
<> | 128:9bcdf88f62b0 | 141 | core_util_critical_section_enter(); |
<> | 128:9bcdf88f62b0 | 142 | pwmout_pulsewidth_ms(&_pwm, ms); |
<> | 128:9bcdf88f62b0 | 143 | core_util_critical_section_exit(); |
<> | 128:9bcdf88f62b0 | 144 | } |
<> | 128:9bcdf88f62b0 | 145 | |
<> | 128:9bcdf88f62b0 | 146 | /** Set the PWM pulsewidth, specified in micro-seconds (int), keeping the period the same. |
<> | 128:9bcdf88f62b0 | 147 | */ |
<> | 128:9bcdf88f62b0 | 148 | void pulsewidth_us(int us) { |
<> | 128:9bcdf88f62b0 | 149 | core_util_critical_section_enter(); |
<> | 128:9bcdf88f62b0 | 150 | pwmout_pulsewidth_us(&_pwm, us); |
<> | 128:9bcdf88f62b0 | 151 | core_util_critical_section_exit(); |
<> | 128:9bcdf88f62b0 | 152 | } |
<> | 128:9bcdf88f62b0 | 153 | |
<> | 128:9bcdf88f62b0 | 154 | /** A operator shorthand for write() |
<> | 128:9bcdf88f62b0 | 155 | */ |
<> | 128:9bcdf88f62b0 | 156 | PwmOut& operator= (float value) { |
<> | 128:9bcdf88f62b0 | 157 | // Underlying call is thread safe |
<> | 128:9bcdf88f62b0 | 158 | write(value); |
<> | 128:9bcdf88f62b0 | 159 | return *this; |
<> | 128:9bcdf88f62b0 | 160 | } |
<> | 128:9bcdf88f62b0 | 161 | |
<> | 128:9bcdf88f62b0 | 162 | PwmOut& operator= (PwmOut& rhs) { |
<> | 128:9bcdf88f62b0 | 163 | // Underlying call is thread safe |
<> | 128:9bcdf88f62b0 | 164 | write(rhs.read()); |
<> | 128:9bcdf88f62b0 | 165 | return *this; |
<> | 128:9bcdf88f62b0 | 166 | } |
<> | 128:9bcdf88f62b0 | 167 | |
<> | 128:9bcdf88f62b0 | 168 | /** An operator shorthand for read() |
<> | 128:9bcdf88f62b0 | 169 | */ |
<> | 128:9bcdf88f62b0 | 170 | operator float() { |
<> | 128:9bcdf88f62b0 | 171 | // Underlying call is thread safe |
<> | 128:9bcdf88f62b0 | 172 | return read(); |
<> | 128:9bcdf88f62b0 | 173 | } |
<> | 128:9bcdf88f62b0 | 174 | |
<> | 128:9bcdf88f62b0 | 175 | protected: |
<> | 128:9bcdf88f62b0 | 176 | pwmout_t _pwm; |
<> | 128:9bcdf88f62b0 | 177 | }; |
<> | 128:9bcdf88f62b0 | 178 | |
<> | 128:9bcdf88f62b0 | 179 | } // namespace mbed |
<> | 128:9bcdf88f62b0 | 180 | |
<> | 128:9bcdf88f62b0 | 181 | #endif |
<> | 128:9bcdf88f62b0 | 182 | |
<> | 128:9bcdf88f62b0 | 183 | #endif |
<> | 128:9bcdf88f62b0 | 184 | |
<> | 128:9bcdf88f62b0 | 185 | /** @}*/ |