Diff: main.cpp

Revision:

0:c0f091562db4

Child:

1:ea25641678f7

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Dec 02 19:58:25 2014 +0000
@@ -0,0 +1,97 @@
+/*
+** This software can be freely used, even comercially, as highlighted in the license.
+** 
+** Copyright 2014 GHI Electronics, LLC
+** 
+** Licensed under the Apache License, Version 2.0 (the "License");
+** you may not use this file except in compliance with the License.
+** You may obtain a copy of the License at
+** 
+**     http://www.apache.org/licenses/LICENSE-2.0
+** 
+** Unless required by applicable law or agreed to in writing, software
+** distributed under the License is distributed on an "AS IS" BASIS,
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+** See the License for the specific language governing permissions and
+** limitations under the License.
+**
+**/
+
+#include "mbed.h"
+#include "character_display.h"
+
+// Outrageous Circuits PowerMate
+
+#define TIME_BETWEEN_SAMPLES_ms 300
+
+void led_flash();
+void print_float(float value, char* units, int fraction_digits);
+
+character_display lcd(P0_14, P0_13, P0_12, P0_11, P0_22, P0_10); // RS, E, D4-D7, LCDType=LCD16x2, BL=NC, E2=NC, LCDTCtrl=HD44780
+
+main()
+{
+    Ticker blink;
+    
+    AnalogIn voltage(P0_23);
+    AnalogIn current(P0_15);
+   
+    DigitalIn btn1(P0_1,PullUp);
+    DigitalIn btn2(P1_19,PullUp);
+    
+    const int DISPLAY_VOLTAGE = 1;
+    const int DISPLAY_CURRENT = 2;
+    int display = 0;
+    
+    Timer clock;
+    uint32_t start_time_ms = 0;
+
+    blink.attach(&led_flash, 0.5);                   
+    clock.start();
+    
+    while(1) { 
+        if (btn1 == 0) {
+            display = DISPLAY_VOLTAGE;
+            start_time_ms = clock.read_ms(); 
+            wait_ms(TIME_BETWEEN_SAMPLES_ms + 1);  // force a sample and display
+        } else if (btn2 == 0){
+            display = DISPLAY_CURRENT;
+            start_time_ms = clock.read_ms();
+            wait_ms(TIME_BETWEEN_SAMPLES_ms + 1);
+        }
+
+        if (clock.read_ms() - start_time_ms >= TIME_BETWEEN_SAMPLES_ms) {
+            lcd.clear();
+            switch (display){
+                case DISPLAY_VOLTAGE:
+                    print_float(voltage.read()*3.3*2,"V",3);
+                    break;
+                case DISPLAY_CURRENT:
+                    print_float((current.read()*3.3)/1.1,"A",2);
+                    break;
+                default:
+                    lcd.print("1V 2A");
+                    break;
+            }
+            
+            start_time_ms = clock.read_ms();
+        }
+    }
+}
+
+DigitalOut LED[]={(P0_18),(P0_19)};
+uint8_t whichLED=0;
+
+void led_flash()
+{
+    LED[whichLED]=1;
+    whichLED = whichLED ? 0 : 1 ;
+    LED[whichLED]=0;
+}
+ 
+void print_float(float value,char * suffix, int fractional_digits)
+{
+    char buffer[16];
+    (void) sprintf(buffer,"%7.*f%1.1s", fractional_digits, value, suffix); // 8 total: 6 numeric digits, one for the decimal point, 1 for suffix
+    lcd.print(buffer);
+}