Ted Lin
/
Nucleo_key_led_with_mbed_os
implement button press/release with double check using mbed OS
main.cpp@0:4ff16441b862, 2016-08-28 (annotated)
- Committer:
- mintisan
- Date:
- Sun Aug 28 12:29:03 2016 +0000
- Revision:
- 0:4ff16441b862
setup two thread to double check down/up status
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
mintisan | 0:4ff16441b862 | 1 | #include "mbed.h" |
mintisan | 0:4ff16441b862 | 2 | |
mintisan | 0:4ff16441b862 | 3 | //------------------------------------ |
mintisan | 0:4ff16441b862 | 4 | // USER_KEY-PB_3 / USER_BUTTON-PC_13 |
mintisan | 0:4ff16441b862 | 5 | //------------------------------------ |
mintisan | 0:4ff16441b862 | 6 | InterruptIn mybutton(PB_3); |
mintisan | 0:4ff16441b862 | 7 | //------------------------------------ |
mintisan | 0:4ff16441b862 | 8 | // LED1-PA5 |
mintisan | 0:4ff16441b862 | 9 | //------------------------------------ |
mintisan | 0:4ff16441b862 | 10 | DigitalOut myled(PA_5); |
mintisan | 0:4ff16441b862 | 11 | //------------------------------------ |
mintisan | 0:4ff16441b862 | 12 | // Hyperterminal configuration |
mintisan | 0:4ff16441b862 | 13 | // 9600 bauds, 8-bit data, no parity |
mintisan | 0:4ff16441b862 | 14 | // SERIAL_TX-PA2, SERIAL_RX-PA3 |
mintisan | 0:4ff16441b862 | 15 | //------------------------------------ |
mintisan | 0:4ff16441b862 | 16 | Serial pc(PA_2, PA_3); |
mintisan | 0:4ff16441b862 | 17 | |
mintisan | 0:4ff16441b862 | 18 | #define entry() pc.printf("func:%s\n", __FUNCTION__) |
mintisan | 0:4ff16441b862 | 19 | |
mintisan | 0:4ff16441b862 | 20 | #define error() pc.printf("Error! func:%s, line: %d\n", __FUNCTION__, __LINE__) |
mintisan | 0:4ff16441b862 | 21 | |
mintisan | 0:4ff16441b862 | 22 | enum{OFF=0,ON=1}; |
mintisan | 0:4ff16441b862 | 23 | enum{PRESS= 0, RELEASE = 1, UNKNOWN}; |
mintisan | 0:4ff16441b862 | 24 | #define PRESS_JITTER_TIME 10 // 10ms |
mintisan | 0:4ff16441b862 | 25 | #define RELEASE_JITTER_TIME 20 // 20ms |
mintisan | 0:4ff16441b862 | 26 | uint8_t cur_flag_status = UNKNOWN; |
mintisan | 0:4ff16441b862 | 27 | uint8_t pre_flag_status = UNKNOWN; |
mintisan | 0:4ff16441b862 | 28 | |
mintisan | 0:4ff16441b862 | 29 | void update_key_status(void) |
mintisan | 0:4ff16441b862 | 30 | { |
mintisan | 0:4ff16441b862 | 31 | pre_flag_status = cur_flag_status; |
mintisan | 0:4ff16441b862 | 32 | cur_flag_status = mybutton.read(); |
mintisan | 0:4ff16441b862 | 33 | } |
mintisan | 0:4ff16441b862 | 34 | |
mintisan | 0:4ff16441b862 | 35 | void key_down_status(void) |
mintisan | 0:4ff16441b862 | 36 | { |
mintisan | 0:4ff16441b862 | 37 | update_key_status(); |
mintisan | 0:4ff16441b862 | 38 | if(cur_flag_status == PRESS){ |
mintisan | 0:4ff16441b862 | 39 | if(myled.read()!=ON){ |
mintisan | 0:4ff16441b862 | 40 | if(pre_flag_status == PRESS){ |
mintisan | 0:4ff16441b862 | 41 | myled = ON; |
mintisan | 0:4ff16441b862 | 42 | pc.printf("Pressed\n"); |
mintisan | 0:4ff16441b862 | 43 | } |
mintisan | 0:4ff16441b862 | 44 | } |
mintisan | 0:4ff16441b862 | 45 | } |
mintisan | 0:4ff16441b862 | 46 | } |
mintisan | 0:4ff16441b862 | 47 | |
mintisan | 0:4ff16441b862 | 48 | void key_up_status(void) |
mintisan | 0:4ff16441b862 | 49 | { |
mintisan | 0:4ff16441b862 | 50 | update_key_status(); |
mintisan | 0:4ff16441b862 | 51 | if(cur_flag_status == RELEASE){ |
mintisan | 0:4ff16441b862 | 52 | if(myled.read()!=OFF){ |
mintisan | 0:4ff16441b862 | 53 | if(pre_flag_status == RELEASE){ |
mintisan | 0:4ff16441b862 | 54 | myled = OFF; |
mintisan | 0:4ff16441b862 | 55 | pc.printf("Released\n"); |
mintisan | 0:4ff16441b862 | 56 | } |
mintisan | 0:4ff16441b862 | 57 | } |
mintisan | 0:4ff16441b862 | 58 | } |
mintisan | 0:4ff16441b862 | 59 | } |
mintisan | 0:4ff16441b862 | 60 | |
mintisan | 0:4ff16441b862 | 61 | //https://developer.mbed.org/handbook/RTOS |
mintisan | 0:4ff16441b862 | 62 | void user_thread_down(const void* args) |
mintisan | 0:4ff16441b862 | 63 | { |
mintisan | 0:4ff16441b862 | 64 | while(true){ |
mintisan | 0:4ff16441b862 | 65 | key_down_status(); |
mintisan | 0:4ff16441b862 | 66 | Thread::wait(PRESS_JITTER_TIME); |
mintisan | 0:4ff16441b862 | 67 | } |
mintisan | 0:4ff16441b862 | 68 | } |
mintisan | 0:4ff16441b862 | 69 | |
mintisan | 0:4ff16441b862 | 70 | void user_thread_up(const void* args) |
mintisan | 0:4ff16441b862 | 71 | { |
mintisan | 0:4ff16441b862 | 72 | while(true){ |
mintisan | 0:4ff16441b862 | 73 | key_up_status(); |
mintisan | 0:4ff16441b862 | 74 | Thread::wait(RELEASE_JITTER_TIME); |
mintisan | 0:4ff16441b862 | 75 | } |
mintisan | 0:4ff16441b862 | 76 | } |
mintisan | 0:4ff16441b862 | 77 | |
mintisan | 0:4ff16441b862 | 78 | /* |
mintisan | 0:4ff16441b862 | 79 | * one thread for down check; |
mintisan | 0:4ff16441b862 | 80 | * another thread for up check. |
mintisan | 0:4ff16441b862 | 81 | */ |
mintisan | 0:4ff16441b862 | 82 | int main(void) |
mintisan | 0:4ff16441b862 | 83 | { |
mintisan | 0:4ff16441b862 | 84 | myled = OFF; |
mintisan | 0:4ff16441b862 | 85 | Thread thread_down(user_thread_down); |
mintisan | 0:4ff16441b862 | 86 | Thread thread_up(user_thread_up); |
mintisan | 0:4ff16441b862 | 87 | while(true){ |
mintisan | 0:4ff16441b862 | 88 | } |
mintisan | 0:4ff16441b862 | 89 | } |