Werner Terreblanche
/
mBuino_low_power_led_flasher
mBuino low current/ deep sleep LED flasher to be used as key finder.
WakeUp.h@1:c0cfd1b0f4ef, 2014-09-17 (annotated)
- Committer:
- wernert
- Date:
- Wed Sep 17 09:29:41 2014 +0000
- Revision:
- 1:c0cfd1b0f4ef
- Parent:
- 0:346c8150ca74
Update to disable pull-up that were causing extra current to be drawn.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
wernert | 0:346c8150ca74 | 1 | #include "mbed.h" |
wernert | 0:346c8150ca74 | 2 | |
wernert | 0:346c8150ca74 | 3 | /** |
wernert | 0:346c8150ca74 | 4 | * Class to make wake up a microcontroller from deepsleep using a low-power timer. |
wernert | 0:346c8150ca74 | 5 | * |
wernert | 0:346c8150ca74 | 6 | * @code |
wernert | 0:346c8150ca74 | 7 | * // Depending on the LED connections either the LED is off the 2 seconds |
wernert | 0:346c8150ca74 | 8 | * // the target spends in deepsleep(), and on for the other second. Or it is inverted |
wernert | 0:346c8150ca74 | 9 | * |
wernert | 0:346c8150ca74 | 10 | * #include "mbed.h" |
wernert | 0:346c8150ca74 | 11 | * #include "WakeUp.h" |
wernert | 0:346c8150ca74 | 12 | * |
wernert | 0:346c8150ca74 | 13 | * DigitalOut myled(LED1); |
wernert | 0:346c8150ca74 | 14 | * |
wernert | 0:346c8150ca74 | 15 | * int main() { |
wernert | 0:346c8150ca74 | 16 | * wait(5); |
wernert | 0:346c8150ca74 | 17 | * |
wernert | 0:346c8150ca74 | 18 | * //The low-power oscillator can be quite inaccurate on some targets |
wernert | 0:346c8150ca74 | 19 | * //this function calibrates it against the main clock |
wernert | 0:346c8150ca74 | 20 | * WakeUp::calibrate(); |
wernert | 0:346c8150ca74 | 21 | * |
wernert | 0:346c8150ca74 | 22 | * while(1) { |
wernert | 0:346c8150ca74 | 23 | * //Set LED to zero |
wernert | 0:346c8150ca74 | 24 | * myled = 0; |
wernert | 0:346c8150ca74 | 25 | * |
wernert | 0:346c8150ca74 | 26 | * //Set wakeup time for 2 seconds |
wernert | 0:346c8150ca74 | 27 | * WakeUp::set_ms(2000); |
wernert | 0:346c8150ca74 | 28 | * |
wernert | 0:346c8150ca74 | 29 | * //Enter deepsleep, the program won't go beyond this point until it is woken up |
wernert | 0:346c8150ca74 | 30 | * deepsleep(); |
wernert | 0:346c8150ca74 | 31 | * |
wernert | 0:346c8150ca74 | 32 | * //Set LED for 1 second to one |
wernert | 0:346c8150ca74 | 33 | * myled = 1; |
wernert | 0:346c8150ca74 | 34 | * wait(1); |
wernert | 0:346c8150ca74 | 35 | * } |
wernert | 0:346c8150ca74 | 36 | * } |
wernert | 0:346c8150ca74 | 37 | * @endcode |
wernert | 0:346c8150ca74 | 38 | */ |
wernert | 0:346c8150ca74 | 39 | class WakeUp |
wernert | 0:346c8150ca74 | 40 | { |
wernert | 0:346c8150ca74 | 41 | public: |
wernert | 0:346c8150ca74 | 42 | /** |
wernert | 0:346c8150ca74 | 43 | * Set the timeout |
wernert | 0:346c8150ca74 | 44 | * |
wernert | 0:346c8150ca74 | 45 | * @param s required time in seconds |
wernert | 0:346c8150ca74 | 46 | */ |
wernert | 0:346c8150ca74 | 47 | static void set(uint32_t s) { |
wernert | 0:346c8150ca74 | 48 | set_ms(1000 * s); |
wernert | 0:346c8150ca74 | 49 | } |
wernert | 0:346c8150ca74 | 50 | |
wernert | 0:346c8150ca74 | 51 | /** |
wernert | 0:346c8150ca74 | 52 | * Set the timeout |
wernert | 0:346c8150ca74 | 53 | * |
wernert | 0:346c8150ca74 | 54 | * @param ms required time in milliseconds |
wernert | 0:346c8150ca74 | 55 | */ |
wernert | 0:346c8150ca74 | 56 | static void set_ms(uint32_t ms); |
wernert | 0:346c8150ca74 | 57 | |
wernert | 0:346c8150ca74 | 58 | /** |
wernert | 0:346c8150ca74 | 59 | * Attach a function to be called after timeout |
wernert | 0:346c8150ca74 | 60 | * |
wernert | 0:346c8150ca74 | 61 | * This is optional, if you just want to wake up you |
wernert | 0:346c8150ca74 | 62 | * do not need to attach a function. |
wernert | 0:346c8150ca74 | 63 | * |
wernert | 0:346c8150ca74 | 64 | * Important: Many targets will run the wake-up routine |
wernert | 0:346c8150ca74 | 65 | * at reduced clock speed, afterwards clock speed is restored. |
wernert | 0:346c8150ca74 | 66 | * This means that clock speed dependent functions, such as printf |
wernert | 0:346c8150ca74 | 67 | * might end up distorted. |
wernert | 0:346c8150ca74 | 68 | * |
wernert | 0:346c8150ca74 | 69 | * Also supports normal way to attach member functions |
wernert | 0:346c8150ca74 | 70 | * (not documented for simplicity) |
wernert | 0:346c8150ca74 | 71 | * |
wernert | 0:346c8150ca74 | 72 | * @param *function function to call |
wernert | 0:346c8150ca74 | 73 | */ |
wernert | 0:346c8150ca74 | 74 | static void attach(void (*function)(void)) { |
wernert | 0:346c8150ca74 | 75 | callback.attach(function); |
wernert | 0:346c8150ca74 | 76 | } |
wernert | 0:346c8150ca74 | 77 | |
wernert | 0:346c8150ca74 | 78 | template<typename T> |
wernert | 0:346c8150ca74 | 79 | static void attach(T *object, void (T::*member)(void)) { |
wernert | 0:346c8150ca74 | 80 | callback.attach(object, member); |
wernert | 0:346c8150ca74 | 81 | } |
wernert | 0:346c8150ca74 | 82 | |
wernert | 0:346c8150ca74 | 83 | /** |
wernert | 0:346c8150ca74 | 84 | * Calibrate the timer |
wernert | 0:346c8150ca74 | 85 | * |
wernert | 0:346c8150ca74 | 86 | * Some of the low-power timers have very bad accuracy. |
wernert | 0:346c8150ca74 | 87 | * This function calibrates it against the main timer. |
wernert | 0:346c8150ca74 | 88 | * |
wernert | 0:346c8150ca74 | 89 | * Warning: Blocks for 100ms! |
wernert | 0:346c8150ca74 | 90 | */ |
wernert | 0:346c8150ca74 | 91 | static void calibrate(void); |
wernert | 0:346c8150ca74 | 92 | |
wernert | 0:346c8150ca74 | 93 | |
wernert | 0:346c8150ca74 | 94 | private: |
wernert | 0:346c8150ca74 | 95 | static FunctionPointer callback; |
wernert | 0:346c8150ca74 | 96 | static void irq_handler(void); |
wernert | 0:346c8150ca74 | 97 | static float cycles_per_ms; |
wernert | 0:346c8150ca74 | 98 | }; |