Diff: main.cpp

Revision:

0:cbacd2d41523

Child:

1:7dd6c7104fef

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon Sep 23 19:24:28 2013 +0000
@@ -0,0 +1,182 @@
+#include "mbed.h"
+#include "SAA1064.h"
+#include "PCF8591.h"
+
+#define lpc812  1
+#define lpc1768 0
+
+//DigitalOut myled1(LED1);
+DigitalOut heartbeatLED(LED1);
+
+//Pin Defines for I2C Bus
+
+#if (lpc1768)
+// SDA, SCL for LPC1768
+#define D_SDA                  p28
+#define D_SCL                  p27
+#endif
+
+#if (lpc812)
+// SDA, SCL for LPC812
+#define D_SDA                  P0_10
+#define D_SCL                  P0_11
+#endif
+
+//I2C Bus
+I2C i2c_bus(D_SDA, D_SCL);
+
+
+//SAA1064 LED(&i2c_bus, SAA1064_SA0);
+SAA1064 LED(&i2c_bus);
+
+//PCF8591 adc_dac(&i2c_bus, PCF8591_SA0);
+PCF8591 adc_dac(&i2c_bus);
+
+PCF8591_AnalogOut anaOut(&i2c_bus);
+
+PCF8591_AnalogIn anaIn(&i2c_bus, PCF8591_ADC1);
+
+
+//Host PC Baudrate (Virtual Com Port on USB)
+#define D_BAUDRATE            9600
+//#define D_BAUDRATE            57600
+
+// Host PC Communication channels
+#if (lpc1768)
+Serial pc(USBTX, USBRX); // tx, rx for mbed LPC800 MAX
+#endif
+
+#if (lpc812)
+Serial pc(P0_4, P0_0); // tx, rx for LPC812 LPCXpresso
+#endif
+
+// Variables for Heartbeat and Status monitoring
+Ticker heartbeat;
+bool heartbeatflag=false;
+
+// Cycle Timer
+//const int maxcount = 1000;
+
+// Local functions
+void clear_screen() {
+//ANSI Terminal Commands
+ //   pc.printf("\x1B[2J");
+  //  pc.printf("\x1B[H");
+}
+
+
+void init_interfaces() {
+    // Init Host PC communication, default is 9600
+    //pc.baud(D_BAUDRATE);
+      
+    // Init I/F hardware
+    i2c_bus.frequency(100000);  
+
+    // Init LEDs off
+    heartbeatLED = 1; 
+}
+
+// Heartbeat monitor
+void pulse() {
+  heartbeatLED = !heartbeatLED;
+}
+
+void heartbeat_start() {
+  heartbeat.attach(&pulse, 0.5);
+}
+
+void heartbeat_stop() {
+  heartbeat.detach();
+}
+
+
+int main() {
+  uint8_t slave_address = 0x40; //PCF8574
+  char buf[128];  
+  uint8_t count = 0;
+  uint8_t analog;    
+
+  init_interfaces();
+    
+  //heartbeat_start();
+          
+  clear_screen(); 
+    
+  pc.printf("\r\nHello World from LPC812\r\n");
+
+  LED.write(SAA1064_SEGM[0], SAA1064_SEGM[1], SAA1064_SEGM[2], SAA1064_SEGM[3]);
+//  LED.write(SAA1064_SEGM[4], SAA1064_SEGM[5], SAA1064_SEGM[6], SAA1064_SEGM[7]);
+//  LED.write(SAA1064_SEGM[8], SAA1064_SEGM[9], SAA1064_SEGM[0x0A], SAA1064_SEGM[0x0B]);
+//  LED.write(SAA1064_SEGM[0x0C], SAA1064_SEGM[0x0D], SAA1064_SEGM[0x0E], SAA1064_SEGM[0x0F]);
+
+   wait(1.0);    
+
+   LED.snake(1); 
+   wait(1.0);    
+       
+   LED.snake(4);
+   wait(1.0);    
+
+   LED.splash(6);
+   wait(1.0);    
+
+//   pc.printf("Ctrl    = 0x%02X ", PCF8591_CTRL_DEF);        //0x40
+//   pc.printf("ADC Adr = 0x%02X ", PCF8591_ADC1);            //0x01
+
+
+//812 BUG: seems a delay is needed between write ADC register and read ADC or ADC results are unstable, DAC values leaking through...    
+//The Heartbeat Interrupt also seems to make the problem worse
+
+  while(1) {
+    float ana;  
+    //pc.putc('*');            
+  
+    wait_ms(20);        
+
+//    analog = adc_dac.read(PCF8591_ADC0);  // read A/D value for Channel 0 (LDR)
+//    analog = adc_dac.read(PCF8591_ADC1);  // read A/D value for Channel 1 (potmeter)   
+//    pc.printf("%d ", analog);      
+   
+    ana=anaIn;     
+    pc.printf("%2.2f ", ana);           
+    
+//    pc.printf("%2.2f ", anaIn);                   
+
+    anaOut = ana;    
+  }
+  
+
+          
+  while(1) {
+//   myled1 = 0;
+//   wait(0.1);      
+//   myled1 = 1;
+//   wait(0.9);
+               
+    //pc.printf("*");        
+    pc.putc('*');            
+    wait(0.2);    
+
+    buf[0] = count;
+    i2c_bus.write(slave_address, buf, 1);
+    count++;       
+    
+//    LED.writeInt(-150 + count, 3, false);    
+    LED.writeInt(-150 + count, 3);    //suppress leading zero
+    
+    adc_dac.write(count);                 // write D/A value
+//    pc.printf("md=0x%02X ", adc_dac._mode);
+
+//812 BUG: seems a delay is needed between write DAC and read ADC or ADC results are unstable, DAC values leaking through...    
+//The Heartbeat Interrupt also seems to make the problem worse
+//    wait_ms(25);        
+
+//    analog = adc_dac.read(PCF8591_ADC0);  // read A/D value for Channel 0 (LDR)
+    analog = adc_dac.read(PCF8591_ADC1);  // read A/D value for Channel 1 (potmeter)   
+//    pc.printf("ma=0x%02X ", adc_dac._mode);    
+    pc.printf("%d ", analog);        
+    
+  }
+  
+  //pc.printf("Bye World!\n\r");   
+}