Revision 0:54509830df20, committed 2016-08-28

Comitter:

mintisan

Date:

Sun Aug 28 12:50:45 2016 +0000

Commit message:

implement button press/release with double check using coroutine

Changed in this revision

diff -r 000000000000 -r 54509830df20 coroutine.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/coroutine.h	Sun Aug 28 12:50:45 2016 +0000
@@ -0,0 +1,34 @@
+#ifndef COROUTINE_H_
+#define COROUTINE_H_
+
+#ifdef __cplushplus
+extern "C"{
+#endif
+
+/**
+ * C coroutine 
+ * https://github.com/mintisan/mintisan.github.io/wiki/C#coroutine
+ */
+
+#define cr_start()              \
+        static int __s = 0;     \
+        switch(__s){            \
+            case 0:
+
+// '\' doesn't count for one line in C
+#define cr_yield(condition) do{      \
+            __s = __LINE__ ;     \
+                case __LINE__:      \
+                    if(condition)   \
+                    return;         \
+                }while(0)
+
+#define cr_end()                \
+        } __s = 0;            
+
+
+#ifdef __cplushplus
+}
+#endif
+
+#endif

diff -r 000000000000 -r 54509830df20 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sun Aug 28 12:50:45 2016 +0000
@@ -0,0 +1,111 @@
+#include "mbed.h"
+#include "coroutine.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;
+
+#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;
+
+volatile uint16_t cr_time_down;
+volatile uint16_t cr_time_up;
+
+void isr_ticker() {
+    cr_time_down++;
+    cr_time_up++;
+}
+
+
+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");
+           }
+        }
+    }
+}
+
+void user_thread_down(void)
+{
+    cr_start();
+    
+    // inital once each loop
+    cr_time_down = 0;
+    // waiting for condition is satisfied, or will be yield
+    cr_yield(cr_time_down != 1);
+    key_down_status();
+    
+    cr_end();    
+}
+
+void user_thread_up(void)
+{
+    cr_start();
+    
+    // inital once each loop
+    cr_time_up = 0;
+    // waiting for condition is satisfied, or will be yield
+    cr_yield(cr_time_up != 2);
+    key_up_status();
+
+    cr_end();   
+}
+
+/* 
+ *  one coroutine for down check;
+ *  another coroutine for up check.
+ */
+int main(void)
+{
+    myled = OFF;
+    jitter.attach(&isr_ticker, PRESS_JITTER_TIME);
+    while(1) {
+        user_thread_down();
+        user_thread_up();
+        // extend more task here
+    }
+}
\ No newline at end of file

diff -r 000000000000 -r 54509830df20 mbed-dev.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-dev.lib	Sun Aug 28 12:50:45 2016 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed-dev/#423e1876dc07