Revision 0:ebf8ee3811c2, committed 2016-08-28

Comitter:

mintisan

Date:

Sun Aug 28 12:54:53 2016 +0000

Commit message:

implement button press/release with double check using two tickers; ;

Changed in this revision

diff -r 000000000000 -r ebf8ee3811c2 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sun Aug 28 12:54:53 2016 +0000
@@ -0,0 +1,75 @@
+#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
+    }
+}
\ No newline at end of file

diff -r 000000000000 -r ebf8ee3811c2 mbed.bld
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Sun Aug 28 12:54:53 2016 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/2241e3a39974
\ No newline at end of file