Diff: main.cpp

Revision:

0:13c37793b4c6

Child:

1:10aa79121f61

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Jan 03 06:27:05 2017 +0000
@@ -0,0 +1,126 @@
+#include "mbed.h"
+
+
+#define kCommandAddress 0x50
+#define MaxReceiveBufferSize 100
+
+#define kCommandUp      'u'     //  i2c command : up - power on
+#define kCommandDown    'd'     //              : down - power off
+#define kCommandLED     'l'     //              : led - on/off/flash
+
+#define kLED_Off    0   // LED off
+#define kLED_On     1   // LED on
+#define kLED_Flash  2   // LED flash 
+
+
+I2CSlave slave(dp5, dp27);
+
+DigitalOut rpiPower(dp17);
+DigitalOut led(dp14);
+
+int powerMode = kCommandUp;
+int ledMode   = kLED_Flash;
+
+
+static char buf[MaxReceiveBufferSize];
+
+Ticker second;
+long counter = -1;
+
+void powerOff() {
+    rpiPower  = 0;
+    powerMode = kCommandDown;
+}
+
+void powerOn() {
+    rpiPower  = 1;
+    powerMode = kCommandUp;
+}
+
+
+void ledOn() {
+    led     = 1;
+    ledMode = kLED_On;
+}
+
+void ledOff() {
+    led     = 0;
+    ledMode = kLED_Off;
+}
+
+
+void funcSecond() {
+    if (counter > 0) {
+        counter --;
+        if (counter == 0) {
+            if (powerMode == kCommandDown) {
+                powerOn();
+            } else {
+                powerOff();
+            }
+            counter = -1;      
+        }
+    }  
+    
+    if (ledMode == kLED_Flash) {
+        led = 1;
+        wait_ms(10);
+        led = 0;
+    }  
+}
+
+int main()
+{
+    slave.address(kCommandAddress);
+    second.attach(funcSecond, 1);
+    
+    powerOn();
+    
+    while(1) {
+        int status = slave.receive();
+        switch (status) {
+            case I2CSlave::WriteAddressed:
+                if (slave.read(buf, MaxReceiveBufferSize)) {
+                    switch(buf[0]) {
+                    case kCommandUp:
+                        if (powerMode == kCommandUp) {
+                            // error already up   
+                        } else {
+                            long t = atol(buf+1);
+                            if (t > 0) {
+                                counter = t;
+                            } else if (t == 0) {
+                                powerOn();
+                            }
+                        }
+                        break;
+                        
+                    case kCommandDown:
+                        if (powerMode == kCommandDown) {
+                            // error already down   
+                        } else {
+                            long t = atol(buf+1);
+                            if (t > 0) {
+                                counter = t;
+                            } else if (t == 0) {
+                                powerOn();
+                            }
+                        }
+                        break;    
+                    case kCommandLED:
+                        switch (buf[1]) {
+                        case '0': ledOff();             break;
+                        case '1': ledOn();              break;
+                        case 'f': ledMode = kLED_Flash; break;
+                        }
+                    }
+                }
+                break;
+
+            default:
+                wait_ms(1);
+                break;
+        }
+    }
+}
+