main.cpp

00001 #include "mbed.h"
00002 
00003 Serial pc(USBTX,USBRX);
00004 BusOut myled(LED1,LED2,LED3,LED4); // all leds of mbed lsb -> msb
00005 DigitalOut ssel(p24);   // SSEL pio1_11/mbed p24
00006 SPI spi(p5, p6, p7);    // mosi, miso, sclk
00007 
00008 BusOut rgb(p26,p18,p25); // red, blue, green
00009 InterruptIn button(p12); // 0= active/pushed 
00010 
00011 // rgb buss assignments
00012 #define RGB_RED   0x01
00013 #define RGB_BLUE  0x02
00014 #define RGB_GREEN 0x04
00015 
00016 /*  7 Segment Display - this Rev A layout is rotated 180 degrees such that the
00017     decimal point is at the Top/Left
00018 
00019     Rev A schematic defines segent order as: 
00020     
00021     msb 7  6  5  4  3  2  1  0 
00022         F  C  .  B  A  G  E  D
00023         
00024     but setting individual segments shows:
00025     msb 7  6  5  4  3  2  1  0 
00026         F  .  E  D  G  B  A  C
00027   
00028                 
00029              --A--
00030             |     |
00031             F     B
00032             |     |
00033              --G--
00034             |     |
00035             E     C
00036             |     |
00037              --D--
00038  */
00039 
00040 // actual segments
00041 #define SA  0xfd 
00042 #define SB  0xfb 
00043 #define SC  0xfe 
00044 #define SD  0xef 
00045 #define SE  0xdf 
00046 #define SF  0x7f 
00047 #define SG  0xf7 
00048 #define SDP 0xbf 
00049 
00050 
00051 #define WTIME   2.5     // delay between cycles
00052 
00053 short curTest = 0;      // 0= all segments, 1= march segments 
00054 
00055 /*      nextTest    ** Interrupt Event for pin fall **
00056 
00057     Advance curTest
00058 */
00059 
00060 void nextTest(void) {
00061     curTest++;
00062     if (curTest >= 3)
00063       curTest = 0;
00064 }
00065 
00066 /*  setIO
00067 
00068     This procedure is used to set the following I/P ports:
00069     
00070     ph      myLed   Shows the test phase
00071     sv      SPI     7-Segment value 0=On
00072     lc      RGB     Led Color
00073 */    
00074 void setIO(short ph, short sv, short lc) {
00075     myled = ph;         // identify phase
00076 
00077     ssel = 0;           // start ssel (sets RCLK to 0)    
00078     spi.write(sv);      // write to the shift register
00079     ssel = 1;           // Toggle RCLK/STCP to apply the SR --> NumDisplay (Rising edge action)
00080 
00081     rgb = lc;           // set led color
00082     wait(WTIME);        // common delay
00083 }
00084 
00085 /*      groupSegs
00086 
00087     This test groups all segments (G:A and DP)
00088     
00089     1:  Segs=Off, DP=Off, Red
00090     2:  Segs=Off, DP=On, Green
00091     3:  Segs:On,  DP=Off, Blue
00092     4:  Segs=On,  DP=On, RGB
00093 */
00094 void groupSegs(void) {
00095 
00096     setIO(1,0xff,RGB_RED);      // 1: all Off, Red
00097     setIO(2,0xbf,RGB_GREEN);    // 2: b6 decimal on, others OFF, Green
00098     setIO(4,0x40,RGB_BLUE);     // 3: b6 decimal off, others On, Blue
00099     setIO(8,0x00,RGB_RED | RGB_GREEN | RGB_BLUE); // 3: all on, all colors
00100 }
00101 
00102 /*      marchBits
00103 
00104     Marches by bit position: 0 -> 7  
00105 
00106     This test marches the bits Low to turn on each segment
00107     in the order of bit 0 --> bit 7
00108     
00109     The initail setting is phase F and all segments Off
00110 */
00111     
00112 void marchBits(void) {
00113     setIO(0xf,0xff,0);    // 1: all Off
00114     setIO(0,0xfe,0);      // 2: b0
00115     setIO(1,0xfd,0);      // 3: b1
00116     setIO(2,0xfb,0);      // 4: b2
00117     setIO(3,0xf7,0);      // 1: b3
00118     setIO(4,0xef,0);      // 2: b4
00119     setIO(5,0xdf,0);      // 3: b5
00120     setIO(6,0xbf,0);      // 4: b6
00121     setIO(7,0x7f,0);      // 4: b7
00122 }
00123 
00124 /*  marchSegs
00125 
00126     Marches by Segments: A -> G, DP  
00127 
00128     This test marches the bits Low to turn on each segment
00129     in the order of the segments A -> G, DP
00130     
00131     The initail setting is phase F and all segments Off
00132 */
00133 
00134 void marchSegs(void) {
00135     setIO(0xf,0xff,0);    // 1: all Off
00136     setIO(0,SA,0);      // 2: b1
00137     setIO(1,SB,0);      // 3: b2
00138     setIO(2,SC,0);      // 4: b0
00139     setIO(3,SD,0);      // 1: b4
00140     setIO(4,SE,0);      // 2: b5
00141     setIO(5,SF,0);      // 3: b7
00142     setIO(6,SG,0);      // 4: b3
00143     setIO(7,SDP,0);     // 4: b6
00144 }
00145 
00146 
00147 /*      main
00148 
00149 */
00150 int main() {
00151     pc.printf("\nEA: Segment & Board I/O Tests\n");
00152     pc.printf("\n Depress/Push Joystick to change tests at end of test cycle\n");
00153     button.fall(&nextTest);
00154     
00155     myled = 0;
00156     spi.format(8,1);    // set format as 8b/pol:pha=0
00157     spi.frequency(1000000); // default is 1mhz
00158 
00159     /* curTest is advanced by the depression/push down of the Joystick */  
00160     while(1) {
00161      switch (curTest){
00162        case 0:
00163          printf("  Group Segments & RGB Led...\n");
00164          groupSegs(); 
00165          break;
00166        
00167        case 1:  
00168          printf("  March Bits b0 => b7...\n");
00169          marchBits(); 
00170          break;
00171          
00172        case 2:  
00173          printf("  March Segments SA => SG, DP...\n");
00174          marchSegs(); 
00175          break;
00176          
00177        default: curTest = 0; break;
00178      }
00179    }
00180 }
00181 
00182