Revision 0:9db2667ac0d3, committed 2010-12-01

Comitter:

the729

Date:

Wed Dec 01 02:53:33 2010 +0000

Commit message:

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Dec 01 02:53:33 2010 +0000
@@ -0,0 +1,103 @@
+#include "mbed.h"
+
+//DigitalOut led1(LED1);
+//DigitalOut led2(LED2);
+
+Serial pc(USBTX, USBRX);
+
+#define BTN0 p15
+#define BTN1 p20
+#define MAX_LENGTH 32
+
+typedef unsigned int uint32_t;
+typedef unsigned char uint8_t;
+
+void precharge(PinName p) 
+{
+    DigitalIn prec(p);
+    prec.mode(PullUp);
+    prec.mode(PullNone);
+}
+
+uint8_t read_cap() 
+{
+    precharge(BTN0);
+    precharge(BTN1);
+    wait_ms(5);
+    float s0 = AnalogIn(BTN0);
+    float s1 = AnalogIn(BTN1);
+    //pc.printf("%f \r", s0);
+    return ((s0>0.5)?0:1) + ((s1>0.5)?0:2);
+}
+
+int main() 
+{
+    enum {
+        IDLE=0, 
+        HOST_INPUT,
+        USER_INPUT
+    } state;
+    uint8_t c = 0;
+    uint32_t data = 0;
+    uint8_t datalength = 0;
+    
+    state = IDLE;
+    while (1) {
+        switch(state) {
+            case IDLE:
+                pc.putc(c = pc.getc());
+                if (c == 'S') {
+                    datalength = 0;
+                    state = HOST_INPUT;
+                } else {
+                    pc.printf("HOST ERROR. You are supposed to input S. Try again. \r\n");
+                }
+                break;
+            case HOST_INPUT:
+                pc.putc(c = pc.getc());
+                if (c == '0' || c == '1') {
+                    datalength ++;
+                    if (datalength > MAX_LENGTH) {
+                        pc.printf("\r\nLength execeeds maximum. \r\n");
+                    } else {
+                        data = (data << 1) | (c-'0');
+                    }
+                } else if (c == 'E') {
+                    pc.printf("\r\nInput End. Tap the caps now. \r\n");
+                    if (!datalength) {
+                        pc.printf("Zero length. Try again. \r\n");
+                        state = IDLE;
+                        break;
+                    }
+                    data <<= (32-datalength);
+                    state = USER_INPUT;
+                } else {
+                    pc.printf("\r\nHOST ERROR. \r\n");
+                }
+                break;
+            case USER_INPUT:
+                c = read_cap();
+                if (!c) break;
+                wait_ms(10);
+                if (c != read_cap()) break;
+                while(read_cap()); 
+                if (c == 3) {
+                    pc.printf("\r\nTOUCH ERROR. Touch only one. \r\n");
+                    break;
+                }
+                c -= 1;
+                pc.putc(c + '0');
+                if (c == (data >> 31)) {
+                    datalength--;
+                    if (!datalength) {
+                        pc.printf("\r\nMATCH! \r\n");
+                        state = IDLE;
+                    }
+                    data <<= 1;
+                } else {
+                    pc.printf("\r\nTOUCH ERROR. \r\n");
+                }
+                break;
+        }
+    }
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Wed Dec 01 02:53:33 2010 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/e2ac27c8e93e