Ted Lin
/
Nucleo_key_led_with_ticker
implement button press/release with double check using two tickers
main.cpp
- Committer:
- mintisan
- Date:
- 2016-08-28
- Revision:
- 0:ebf8ee3811c2
File content as of revision 0:ebf8ee3811c2:
#include "mbed.h" //------------------------------------ // USER_KEY-PB_3 / USER_BUTTON-PC_13 //------------------------------------ DigitalIn mybutton(PB_3); //------------------------------------ // LED1-PA5 //------------------------------------ DigitalOut myled(PA_5); //------------------------------------ // Hyperterminal configuration // 9600 bauds, 8-bit data, no parity // SERIAL_TX-PA2, SERIAL_RX-PA3 //------------------------------------ Serial pc(PA_2, PA_3); Ticker jitter_down, jitter_up; #define entry() pc.printf("func:%s\n", __FUNCTION__) #define error() pc.printf("Error! func:%s, line: %d\n", __FUNCTION__, __LINE__) enum{OFF=0,ON=1}; enum{PRESS= 0, RELEASE = 1, UNKNOWN}; #define PRESS_JITTER_TIME 0.01 // 10ms #define RELEASE_JITTER_TIME 0.02 // 20ms uint8_t cur_flag_status = UNKNOWN; uint8_t pre_flag_status = UNKNOWN; void update_key_status(void) { pre_flag_status = cur_flag_status; cur_flag_status = mybutton.read(); } void key_down_status(void) { update_key_status(); if(cur_flag_status == PRESS){ if(myled.read()!=ON){ if(pre_flag_status == PRESS){ myled = ON; pc.printf("Pressed\n"); } } } } void key_up_status(void) { update_key_status(); if(cur_flag_status == RELEASE){ if(myled.read()!=OFF){ if(pre_flag_status == RELEASE){ myled = OFF; pc.printf("Released\n"); } } } } /* * ticker down for down check; * ticker down for up check. */ int main(void) { myled = OFF; jitter_down.attach(&key_down_status, PRESS_JITTER_TIME); jitter_up.attach(&key_up_status, RELEASE_JITTER_TIME); while(1) { // extend more task here } }