Ted Lin
/
Nucleo_key_led_with_ticker
implement button press/release with double check using two tickers
main.cpp@0:ebf8ee3811c2, 2016-08-28 (annotated)
- Committer:
- mintisan
- Date:
- Sun Aug 28 12:54:53 2016 +0000
- Revision:
- 0:ebf8ee3811c2
implement button press/release with double check using two tickers; ;
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
mintisan | 0:ebf8ee3811c2 | 1 | #include "mbed.h" |
mintisan | 0:ebf8ee3811c2 | 2 | |
mintisan | 0:ebf8ee3811c2 | 3 | //------------------------------------ |
mintisan | 0:ebf8ee3811c2 | 4 | // USER_KEY-PB_3 / USER_BUTTON-PC_13 |
mintisan | 0:ebf8ee3811c2 | 5 | //------------------------------------ |
mintisan | 0:ebf8ee3811c2 | 6 | DigitalIn mybutton(PB_3); |
mintisan | 0:ebf8ee3811c2 | 7 | //------------------------------------ |
mintisan | 0:ebf8ee3811c2 | 8 | // LED1-PA5 |
mintisan | 0:ebf8ee3811c2 | 9 | //------------------------------------ |
mintisan | 0:ebf8ee3811c2 | 10 | DigitalOut myled(PA_5); |
mintisan | 0:ebf8ee3811c2 | 11 | //------------------------------------ |
mintisan | 0:ebf8ee3811c2 | 12 | // Hyperterminal configuration |
mintisan | 0:ebf8ee3811c2 | 13 | // 9600 bauds, 8-bit data, no parity |
mintisan | 0:ebf8ee3811c2 | 14 | // SERIAL_TX-PA2, SERIAL_RX-PA3 |
mintisan | 0:ebf8ee3811c2 | 15 | //------------------------------------ |
mintisan | 0:ebf8ee3811c2 | 16 | Serial pc(PA_2, PA_3); |
mintisan | 0:ebf8ee3811c2 | 17 | |
mintisan | 0:ebf8ee3811c2 | 18 | Ticker jitter_down, jitter_up; |
mintisan | 0:ebf8ee3811c2 | 19 | |
mintisan | 0:ebf8ee3811c2 | 20 | #define entry() pc.printf("func:%s\n", __FUNCTION__) |
mintisan | 0:ebf8ee3811c2 | 21 | |
mintisan | 0:ebf8ee3811c2 | 22 | #define error() pc.printf("Error! func:%s, line: %d\n", __FUNCTION__, __LINE__) |
mintisan | 0:ebf8ee3811c2 | 23 | |
mintisan | 0:ebf8ee3811c2 | 24 | enum{OFF=0,ON=1}; |
mintisan | 0:ebf8ee3811c2 | 25 | enum{PRESS= 0, RELEASE = 1, UNKNOWN}; |
mintisan | 0:ebf8ee3811c2 | 26 | #define PRESS_JITTER_TIME 0.01 // 10ms |
mintisan | 0:ebf8ee3811c2 | 27 | #define RELEASE_JITTER_TIME 0.02 // 20ms |
mintisan | 0:ebf8ee3811c2 | 28 | uint8_t cur_flag_status = UNKNOWN; |
mintisan | 0:ebf8ee3811c2 | 29 | uint8_t pre_flag_status = UNKNOWN; |
mintisan | 0:ebf8ee3811c2 | 30 | |
mintisan | 0:ebf8ee3811c2 | 31 | void update_key_status(void) |
mintisan | 0:ebf8ee3811c2 | 32 | { |
mintisan | 0:ebf8ee3811c2 | 33 | pre_flag_status = cur_flag_status; |
mintisan | 0:ebf8ee3811c2 | 34 | cur_flag_status = mybutton.read(); |
mintisan | 0:ebf8ee3811c2 | 35 | } |
mintisan | 0:ebf8ee3811c2 | 36 | |
mintisan | 0:ebf8ee3811c2 | 37 | void key_down_status(void) |
mintisan | 0:ebf8ee3811c2 | 38 | { |
mintisan | 0:ebf8ee3811c2 | 39 | update_key_status(); |
mintisan | 0:ebf8ee3811c2 | 40 | if(cur_flag_status == PRESS){ |
mintisan | 0:ebf8ee3811c2 | 41 | if(myled.read()!=ON){ |
mintisan | 0:ebf8ee3811c2 | 42 | if(pre_flag_status == PRESS){ |
mintisan | 0:ebf8ee3811c2 | 43 | myled = ON; |
mintisan | 0:ebf8ee3811c2 | 44 | pc.printf("Pressed\n"); |
mintisan | 0:ebf8ee3811c2 | 45 | } |
mintisan | 0:ebf8ee3811c2 | 46 | } |
mintisan | 0:ebf8ee3811c2 | 47 | } |
mintisan | 0:ebf8ee3811c2 | 48 | } |
mintisan | 0:ebf8ee3811c2 | 49 | |
mintisan | 0:ebf8ee3811c2 | 50 | void key_up_status(void) |
mintisan | 0:ebf8ee3811c2 | 51 | { |
mintisan | 0:ebf8ee3811c2 | 52 | update_key_status(); |
mintisan | 0:ebf8ee3811c2 | 53 | if(cur_flag_status == RELEASE){ |
mintisan | 0:ebf8ee3811c2 | 54 | if(myled.read()!=OFF){ |
mintisan | 0:ebf8ee3811c2 | 55 | if(pre_flag_status == RELEASE){ |
mintisan | 0:ebf8ee3811c2 | 56 | myled = OFF; |
mintisan | 0:ebf8ee3811c2 | 57 | pc.printf("Released\n"); |
mintisan | 0:ebf8ee3811c2 | 58 | } |
mintisan | 0:ebf8ee3811c2 | 59 | } |
mintisan | 0:ebf8ee3811c2 | 60 | } |
mintisan | 0:ebf8ee3811c2 | 61 | } |
mintisan | 0:ebf8ee3811c2 | 62 | |
mintisan | 0:ebf8ee3811c2 | 63 | /* |
mintisan | 0:ebf8ee3811c2 | 64 | * ticker down for down check; |
mintisan | 0:ebf8ee3811c2 | 65 | * ticker down for up check. |
mintisan | 0:ebf8ee3811c2 | 66 | */ |
mintisan | 0:ebf8ee3811c2 | 67 | int main(void) |
mintisan | 0:ebf8ee3811c2 | 68 | { |
mintisan | 0:ebf8ee3811c2 | 69 | myled = OFF; |
mintisan | 0:ebf8ee3811c2 | 70 | jitter_down.attach(&key_down_status, PRESS_JITTER_TIME); |
mintisan | 0:ebf8ee3811c2 | 71 | jitter_up.attach(&key_up_status, RELEASE_JITTER_TIME); |
mintisan | 0:ebf8ee3811c2 | 72 | while(1) { |
mintisan | 0:ebf8ee3811c2 | 73 | // extend more task here |
mintisan | 0:ebf8ee3811c2 | 74 | } |
mintisan | 0:ebf8ee3811c2 | 75 | } |