Diff: main.cpp

Revision:

0:f2035b8df504

diff -r 000000000000 -r f2035b8df504 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon May 01 01:43:02 2017 +0000
@@ -0,0 +1,123 @@
+#include "mbed.h"
+#include "USBMouseKeyboard.h"
+
+USBMouseKeyboard key_mouse;
+
+Serial rf_receive(p28, p27);
+
+void processButtons(short b);
+
+/*
+ *  parse incoming message data into X, Y, and buttons
+ *  move cursor by X, Y
+ *  pass buttons along to handler
+ */
+void processMessage(char* msg)
+{
+    short x = msg[1] | (msg[2] << 8);
+    short y = msg[3] | (msg[4] << 8);
+    short button = msg[5] | (msg[6] << 8);
+    processButtons(button);
+    if (button != 0x00) {
+        // pc.printf("rcvd button: %4x \r\n\r\n", button);
+    }
+    key_mouse.move(x, y);
+}
+
+
+/*
+ * process incoming button data, each bit corresponds to a single button
+ * allows for multiple button presses froma  single message
+ */
+void processButtons(short b)
+{
+    // button 1
+    if (((b >> 1) & 0x01) != 0) {
+        // left click
+        key_mouse.click(MOUSE_LEFT);
+    }
+    // button 2
+    if (((b >> 2) & 0x01) != 0) {
+        // Middle click
+        key_mouse.click(MOUSE_MIDDLE);
+    }
+    // button 3
+    if (((b >> 3) & 0x01) != 0) {
+        // right click
+        key_mouse.click(MOUSE_RIGHT);
+    }
+    // button 5
+    if (((b >> 5) & 0x01) != 0) {
+        // volume up
+        key_mouse.mediaControl(KEY_VOLUME_UP);
+    }
+    // button 6
+    if (((b >> 6) & 0x01) != 0) {
+        // scroll up
+        key_mouse.scroll(-1);
+    }
+    // button 7
+    if (((b >> 7) & 0x01) != 0) {
+        // fwd
+        key_mouse.keyCode(RIGHT_ARROW, KEY_ALT);
+    }
+    // button 9
+    if (((b >> 9) & 0x01) != 0) {
+        // volume down
+        key_mouse.mediaControl(KEY_VOLUME_DOWN);
+    }
+    // button 10
+    if (((b >> 10) & 0x01) != 0) {
+        // scroll down
+        key_mouse.scroll(1);
+
+    }
+    // button 11
+    if (((b >> 11) & 0x01) != 0) {
+        // back
+        key_mouse.keyCode(LEFT_ARROW, KEY_ALT);
+    }
+}
+
+
+/*
+ * read in bytes when available from the RF receiver
+ * read in bytes while looking for start character and validating checksum
+ */
+int main()
+{
+
+    rf_receive.baud(4800);
+    int curByte = 0;
+    char received[8];
+    char checksum= 0;
+    while(1) {
+        // check if data available for reading
+        if (rf_receive.readable()) {
+
+            // read in byte into incoming message array
+            received[curByte] = rf_receive.getc();
+            // if this is the first byte in the message
+            if (curByte == 0) {
+                // check if it is the start character, if not, keep overwiting 1st byte
+                if (received[curByte] == 0x55) {
+                    // if so update checksum and increment message data pointer
+                    checksum += received[curByte];
+                    curByte++;
+                }
+                // if received valid start char, read in 6 data bytes, calculating checksum
+            } else if (curByte <= 6) {
+                checksum += received[curByte];
+                curByte++;
+            } else { // else check if calculated checksum matches incoming checksum
+                if (checksum == received[curByte]) {
+                    // if valid message, process data
+                    processMessage(received);
+                }
+                // reset for next message regardless
+                curByte = 0;
+                checksum = 0;
+            }
+        }
+    }
+}