Diff: main.cpp

Revision:

0:ad1dcc41c893

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Mar 07 18:37:37 2013 +0000
@@ -0,0 +1,114 @@
+// My AM/FM Radio, Lab 3 Main
+// Jammie Proctor
+// 03/02/2013
+
+#include "mbed.h"
+#include "TextLCD.h"
+
+I2C radio(p28, p27);                        // sda, scl
+TextLCD lcd(p15, p16, p17, p18, p19, p20);  // rs, e, d4-d7
+DigitalIn AM_FM(p22);                       // Radio mode AM/FM
+DigitalIn station(p23);                     // Station seek/scan
+DigitalOut reset(p21);                      // Radio reset
+DigitalOut lock(LED1);                      // Station active
+PwmOut rclock(p24);                         // Rclock generation
+
+//====================================== Global Variables =============================================
+const int write_addr=0x22;                          
+int fm_pwr_up[3]={0x01, 0x00, 0x05};                    // FM power-up command
+int am_pwr_up[3]={0x01, 0x01, 0x05};                    // AM power-up command
+int fm_station[4]={0x20, 0x00, 0x22, 0x60};             // Set FM station
+int am_station[6]={0x40, 0x00, 0x02, 0x17, 0x00, 0x00}; // Set AM station
+float lcd_station=88.0;
+int reg_station=8800, reg_am_station=535, i=0, Response, ack=0, pwr_down=0x11, tune=0x31;
+int* p_pwr_down = &pwr_down;
+int* p_tune = &tune;
+bool last_mode=0;
+
+//===================================== Support Functions =============================================
+void SendCommand(int* array, int length) {  /* Send Command to Si4735 */
+    radio.start();
+    ack=radio.write(write_addr);
+    for(i=0; i<length; i++) ack=radio.write(array[i]);
+    Response=radio.read(ack);
+    radio.stop();
+    wait(.2);
+}
+    
+void Reset(void) {                          /* Reset AM/FM Radio */
+    reset=0;
+    wait(.2);
+    reset=1;
+    wait(.2);
+}
+
+void AM_Restart(void) {                     /* Reinitialize AM receiver */                 
+    SendCommand(p_tune, 1);                         // Disable carrier
+    wait(.2);
+    SendCommand(p_pwr_down, 1);                     // Power down sequence
+    wait(.2); 
+    Reset();
+    SendCommand(am_pwr_up, 3);                      // Launch AM 
+    SendCommand(am_station, 6);                     // Play current AM station
+}
+
+void FM_Restart(void) {                     /* Reinitialize FM receiver */                          
+    SendCommand(p_tune, 1);                         // Disable carrier
+    wait(.2);
+    SendCommand(p_pwr_down, 1);                     // Power down sequence
+    wait(.2); 
+    Reset();
+    SendCommand(fm_pwr_up, 3);                      // Launch FM
+    SendCommand(fm_station, 4);                     // Play current FM station
+}
+//================================================ Main Code =======================================================
+int main() {
+    AM_FM.mode(PullUp);
+    station.mode(PullUp);
+    lock=0;
+    rclock.period(.000030518);                  // Set rclock oscillator to 32.768kHz
+    rclock=0.5;                                 // 50% Duty Cycle for rclock
+    radio.frequency(100000);                    // I^2C frequency setting 100kHz
+    Reset();                                   
+    SendCommand(fm_pwr_up, 3);                  // Initialize FM
+    SendCommand(fm_station, 4);                 // Play default fm station
+    last_mode=AM_FM;
+        
+    while(1) {
+        if(AM_FM) {                                 // FM selected (SW1 in the off position)
+            if(AM_FM!=last_mode) FM_Restart();      
+            last_mode=AM_FM;
+            if(!station) {                          // SW2 pressed? Go to next station
+                lock=0;
+                while(!station);
+                if(reg_station<10800) reg_station+=10;
+                else reg_station=8800;
+                lcd_station=reg_station/100.0;
+                fm_station[3]=reg_station&0x00FF;
+                fm_station[2]=reg_station>>8;
+                SendCommand(fm_station, 4);          
+                lock=1;       
+            }
+            lcd.printf("Station:\n %3.1fMHz FM", lcd_station);
+            wait(.1);
+            lcd.cls();
+        }
+        else {                                              // AM selected (SW1 in the on position)
+            if(AM_FM!=last_mode) AM_Restart();
+            last_mode=AM_FM;
+            if(!station) {                                  // SW2 pressed? Go to next station
+                lock=0;
+                while(!station);
+                if(reg_am_station<1700) reg_am_station+=5;
+                else reg_am_station=530;
+                am_station[3]=reg_am_station&0x00FF;
+                am_station[2]=reg_am_station>>8;
+                SendCommand(am_station, 6);                 
+                lock=1;       
+            }
+            lcd.printf("Station:\n %ukHz AM", reg_am_station);
+            wait(.1);
+            lcd.cls();
+        }
+    }
+}