main.cpp

00001 #include "mbed.h"
00002 #include "SAA1064.h"
00003 #include "PCF8591.h"
00004 
00005 #define lpc812  1
00006 #define lpc1768 0
00007 
00008 //DigitalOut myled1(LED1);
00009 DigitalOut heartbeatLED(LED1);
00010 
00011 //Pin Defines for I2C Bus
00012 
00013 #if (lpc1768)
00014 // SDA, SCL for LPC1768
00015 #define D_SDA                  p28
00016 #define D_SCL                  p27
00017 #endif
00018 
00019 #if (lpc812)
00020 // SDA, SCL for LPC812
00021 #define D_SDA                  P0_10
00022 #define D_SCL                  P0_11
00023 #endif
00024 
00025 //I2C Bus
00026 I2C i2c_bus(D_SDA, D_SCL);
00027 
00028 
00029 //SAA1064 LED(&i2c_bus, SAA1064_SA0);
00030 SAA1064 LED(&i2c_bus);
00031 
00032 //PCF8591 adc_dac(&i2c_bus, PCF8591_SA0);
00033 PCF8591 adc_dac(&i2c_bus);
00034 
00035 PCF8591_AnalogOut anaOut(&i2c_bus);
00036 
00037 PCF8591_AnalogIn anaIn(&i2c_bus, PCF8591_ADC1);
00038 
00039 
00040 //Host PC Baudrate (Virtual Com Port on USB)
00041 #define D_BAUDRATE            9600
00042 //#define D_BAUDRATE            57600
00043 
00044 // Host PC Communication channels
00045 #if (lpc1768)
00046 Serial pc(USBTX, USBRX); // tx, rx for mbed LPC800 MAX
00047 #endif
00048 
00049 #if (lpc812)
00050 Serial pc(P0_4, P0_0); // tx, rx for LPC812 LPCXpresso
00051 #endif
00052 
00053 // Variables for Heartbeat and Status monitoring
00054 Ticker heartbeat;
00055 bool heartbeatflag=false;
00056 
00057 // Cycle Timer
00058 //const int maxcount = 1000;
00059 
00060 // Local functions
00061 void clear_screen() {
00062 //ANSI Terminal Commands
00063  //   pc.printf("\x1B[2J");
00064   //  pc.printf("\x1B[H");
00065 }
00066 
00067 
00068 void init_interfaces() {
00069     // Init Host PC communication, default is 9600
00070     //pc.baud(D_BAUDRATE);
00071       
00072     // Init I/F hardware
00073     i2c_bus.frequency(100000);  
00074 
00075     // Init LEDs off
00076     heartbeatLED = 1; 
00077 }
00078 
00079 // Heartbeat monitor
00080 void pulse() {
00081   heartbeatLED = !heartbeatLED;
00082 }
00083 
00084 void heartbeat_start() {
00085   heartbeat.attach(&pulse, 0.5);
00086 }
00087 
00088 void heartbeat_stop() {
00089   heartbeat.detach();
00090 }
00091 
00092 
00093 int main() {
00094   uint8_t slave_address = 0x40; //PCF8574
00095   char buf[128];  
00096   uint8_t count = 0;
00097   uint8_t analog;    
00098 
00099   init_interfaces();
00100     
00101   heartbeat_start();
00102           
00103   clear_screen(); 
00104     
00105   pc.printf("\r\nHello World from LPC812\r\n");
00106 
00107   LED.write(SAA1064_SEGM[0], SAA1064_SEGM[1], SAA1064_SEGM[2], SAA1064_SEGM[3]);
00108 //  LED.write(SAA1064_SEGM[4], SAA1064_SEGM[5], SAA1064_SEGM[6], SAA1064_SEGM[7]);
00109 //  LED.write(SAA1064_SEGM[8], SAA1064_SEGM[9], SAA1064_SEGM[0x0A], SAA1064_SEGM[0x0B]);
00110 //  LED.write(SAA1064_SEGM[0x0C], SAA1064_SEGM[0x0D], SAA1064_SEGM[0x0E], SAA1064_SEGM[0x0F]);
00111 
00112    wait(1.0);    
00113 
00114    LED.snake(1); 
00115    wait(1.0);    
00116        
00117    LED.snake(4);
00118    wait(1.0);    
00119 
00120    LED.splash(6);
00121    wait(1.0);    
00122 
00123 
00124 //LPC812 I2C BLOCKWRITE BUG: ADC results are unstable, DAC values leaking through...    
00125 //The Heartbeat Interrupt also seems to make the problem worse
00126 
00127 // Test for PCF8591          
00128   while(1) {
00129     float ana;  
00130     //pc.putc('*');            
00131   
00132     wait_ms(20);        
00133 
00134 //    analog = adc_dac.read(PCF8591_ADC0);  // read A/D value for Channel 0 (LDR)
00135 //    analog = adc_dac.read(PCF8591_ADC1);  // read A/D value for Channel 1 (potmeter)   
00136 //    pc.printf("%d ", analog);      
00137    
00138     ana=anaIn;     
00139     pc.printf("%2.2f ", ana);           
00140     
00141 //    pc.printf("%2.2f ", anaIn);                   
00142 
00143     anaOut = ana;    
00144   }
00145   
00146 
00147 // Test for SAA1064 and PCF8591          
00148   while(0) {
00149               
00150     //pc.printf("*");        
00151     pc.putc('*');            
00152     wait_ms(200);    
00153 
00154     buf[0] = count;
00155     i2c_bus.write(slave_address, buf, 1);
00156     count++;       
00157     
00158 //    LED.writeInt(-150 + count, 3, false);    
00159     LED.writeInt(-150 + count, 3);    //suppress leading zero
00160     
00161     adc_dac.write(count);                 // write D/A value
00162 
00163 //    analog = adc_dac.read(PCF8591_ADC0);  // read A/D value for Channel 0 (LDR)
00164     analog = adc_dac.read(PCF8591_ADC1);  // read A/D value for Channel 1 (potmeter)   
00165     pc.printf("%d ", analog);        
00166    
00167   }
00168   
00169 //  pc.printf("Bye World!\n\r");   
00170 }