iforce2d Chris / Mbed 2 deprecated nRF24L01SimpleExample

Basic port of the gcopeland nRF24L01 library

Dependencies:   mbed

Clock.cpp@2:75a5b58b2338, 2019-03-25 (annotated)

Committer:
iforce2d
Date:
Mon Mar 25 07:35:02 2019 +0000
Revision:
2:75a5b58b2338
Basic port of gcopeland nRF24L01 library

Who changed what in which revision?

UserRevisionLine numberNew contents of line
iforce2d 2:75a5b58b2338 1 #include <mbed.h>
iforce2d 2:75a5b58b2338 2
iforce2d 2:75a5b58b2338 3 // The us ticker is a wrapping uint32_t. We insert interrupts at
iforce2d 2:75a5b58b2338 4 // 0, 0x40000000, 0x8000000, and 0xC0000000, rather than just 0 or just 0xFFFFFFFF because there is
iforce2d 2:75a5b58b2338 5 // code that calls interrupts that are "very soon" immediately and we don't
iforce2d 2:75a5b58b2338 6 // want that. Also because if we only use 0 and 0x80000000 then there is a chance it would
iforce2d 2:75a5b58b2338 7 // be considered to be in the past and executed immediately.
iforce2d 2:75a5b58b2338 8
iforce2d 2:75a5b58b2338 9 class ExtendedClock : public TimerEvent
iforce2d 2:75a5b58b2338 10 {
iforce2d 2:75a5b58b2338 11 public:
iforce2d 2:75a5b58b2338 12 ExtendedClock()
iforce2d 2:75a5b58b2338 13 {
iforce2d 2:75a5b58b2338 14 // This also starts the us ticker.
iforce2d 2:75a5b58b2338 15 mTriggers = 0;
iforce2d 2:75a5b58b2338 16 insert(0x40000000);
iforce2d 2:75a5b58b2338 17 }
iforce2d 2:75a5b58b2338 18
iforce2d 2:75a5b58b2338 19 float read()
iforce2d 2:75a5b58b2338 20 {
iforce2d 2:75a5b58b2338 21 return read_us() / 1000000.0f;
iforce2d 2:75a5b58b2338 22 }
iforce2d 2:75a5b58b2338 23
iforce2d 2:75a5b58b2338 24 uint64_t read_ms()
iforce2d 2:75a5b58b2338 25 {
iforce2d 2:75a5b58b2338 26 return read_us() / 1000;
iforce2d 2:75a5b58b2338 27 }
iforce2d 2:75a5b58b2338 28
iforce2d 2:75a5b58b2338 29 uint64_t read_us()
iforce2d 2:75a5b58b2338 30 {
iforce2d 2:75a5b58b2338 31 return mTriggers * 0x40000000ull + (ticker_read(_ticker_data) & 0x3FFFFFFF);
iforce2d 2:75a5b58b2338 32 }
iforce2d 2:75a5b58b2338 33
iforce2d 2:75a5b58b2338 34 private:
iforce2d 2:75a5b58b2338 35 void handler()
iforce2d 2:75a5b58b2338 36 {
iforce2d 2:75a5b58b2338 37 ++mTriggers;
iforce2d 2:75a5b58b2338 38 // If this is the first time we've been called (at 0x4...)
iforce2d 2:75a5b58b2338 39 // then mTriggers now equals 1 and we want to insert at 0x80000000.
iforce2d 2:75a5b58b2338 40 insert((mTriggers+1) * 0x40000000);
iforce2d 2:75a5b58b2338 41 }
iforce2d 2:75a5b58b2338 42
iforce2d 2:75a5b58b2338 43 // The number of times the us_ticker has rolled over.
iforce2d 2:75a5b58b2338 44 uint32_t mTriggers;
iforce2d 2:75a5b58b2338 45 };
iforce2d 2:75a5b58b2338 46
iforce2d 2:75a5b58b2338 47 static ExtendedClock _GlobalClock;
iforce2d 2:75a5b58b2338 48
iforce2d 2:75a5b58b2338 49 // Return the number of seconds since boot.
iforce2d 2:75a5b58b2338 50 float clock_s()
iforce2d 2:75a5b58b2338 51 {
iforce2d 2:75a5b58b2338 52 return _GlobalClock.read();
iforce2d 2:75a5b58b2338 53 }
iforce2d 2:75a5b58b2338 54
iforce2d 2:75a5b58b2338 55 // Return the number of milliseconds since boot.
iforce2d 2:75a5b58b2338 56 uint64_t clock_ms()
iforce2d 2:75a5b58b2338 57 {
iforce2d 2:75a5b58b2338 58 return _GlobalClock.read_ms();
iforce2d 2:75a5b58b2338 59 }
iforce2d 2:75a5b58b2338 60
iforce2d 2:75a5b58b2338 61 // Return the number of microseconds since boot.
iforce2d 2:75a5b58b2338 62 uint64_t clock_us()
iforce2d 2:75a5b58b2338 63 {
iforce2d 2:75a5b58b2338 64 return _GlobalClock.read_us();
iforce2d 2:75a5b58b2338 65 }