Diff: main.cpp

Revision:

0:c4617b633a1e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Feb 26 18:16:20 2010 +0000
@@ -0,0 +1,132 @@
+#include "mbed.h"
+#include "TextLCD.h"
+
+SPI _spi(p5,p6,p7);                             //mosi, miso, sck
+DigitalOut cs(p8);                              // chip select of MCP3008
+TextLCD lcd(p24, p25, p26, p27, p28, p29, p30); // rs, rw, e, d0, d1, d2, d3
+
+
+int main() {
+        int _data1;
+        int _data2;
+        cs=1;                       // deselect everything
+        wait(0.001);
+        _spi.format(8,0);           //see page1 of MCP3008 manual
+        _spi.frequency(1000000);    //see page4 of MCP3008 manual
+
+//******************************************************************
+//    MCP3008 clock sequence and control bits
+//Once cs low, send start bit ==> 0x01  Not expecting any return
+//next, send control bits   Expecting return B9, B8
+//next, send anything, say 0x00, expecting return B7-B0
+//next shift B9,B8 left 8bits
+//next merge B9,B8 and B7-B0 to form 16bits data
+//next, mask off bit15-bit10, to get a clean 10 bit data
+//*******************************************************************
+
+//*******************************************************************
+//      1st 8bits         2nd 8bits           3rd 8bits
+//ch0      0x01              0x80                 0x00
+//ch1      0x01              0x90                 0x00
+//ch2      0x01              0xA0                 0x00
+//ch3      0x01              0xB0                 0x00
+//ch4      0x01              0xC0                 0x00
+//ch5      0x01              0xD0                 0x00
+//ch6      0x01              0xE0                 0x00
+//ch7      0x01              0xF0                 0x00
+//*******************************************************************
+
+   
+
+    while (1) {
+
+//ch0.
+        cs=0;                               //cs low. start data collection
+        _spi.write(0x01);                   //write start bit. Not expecting return
+        _data1=_spi.write(0x80);            //write control bit, expecting return B9, B8
+        _data2=_spi.write(0x00);            //write anything, expecting return B7-B0
+        int ch0 =(_data1<<8) | _data2;          //merge two 8bits data becoming 16bits data
+        ch0 = ch0 & 0x03FF;                 // mask off bit15 - bit10
+        cs=1;                               //cs high. end of data collection
+
+//ch1   
+        cs=0;                      
+        _spi.write(0x01);
+        _data1=_spi.write(0x90);
+        _data2=_spi.write(0x00);
+        int ch1 =(_data1<<8) | _data2;
+        ch1 = ch1 & 0x03FF;
+        cs=1;
+
+
+//ch2   
+        cs=0;                      
+        _spi.write(0x01);
+        _data1=_spi.write(0xA0);
+        _data2=_spi.write(0x00);
+        int ch2 =(_data1<<8) | _data2;
+        ch2 = ch2 & 0x03FF;
+        cs=1;
+
+
+//ch3   
+        cs=0;                      
+        _spi.write(0x01);
+        _data1=_spi.write(0xB0);
+        _data2=_spi.write(0x00);
+        int ch3 =(_data1<<8) | _data2;
+        ch3 = ch3 & 0x03FF;
+        cs=1;
+
+
+//ch4   
+        cs=0;                      
+        _spi.write(0x01);
+        _data1=_spi.write(0xC0);
+        _data2=_spi.write(0x00);
+        int ch4 =(_data1<<8) | _data2;
+        ch4 = ch4 & 0x03FF;
+        cs=1;
+
+
+//ch5   
+        cs=0;                      
+        _spi.write(0x01);
+        _data1=_spi.write(0xD0);
+        _data2=_spi.write(0x00);
+        int ch5 =(_data1<<8) | _data2;
+        ch5 = ch5 & 0x03FF;
+        cs=1;
+
+
+//ch6   
+        cs=0;                      
+        _spi.write(0x01);
+        _data1=_spi.write(0xE0);
+        _data2=_spi.write(0x00);
+        int ch6 =(_data1<<8) | _data2;
+        ch6 = ch6 & 0x03FF;
+        cs=1;
+
+
+//ch7  
+        cs=0;                      
+        _spi.write(0x01);
+        _data1=_spi.write(0xF0);
+        _data2=_spi.write(0x00);
+        int ch7 =(_data1<<8) | _data2;
+        ch7 = ch7 & 0x03FF;
+        cs=1;
+
+
+//Display the results
+        lcd.cls();
+        lcd.locate(0,0);
+        lcd.printf("%d%d%d%d",ch0,ch1,ch2,ch3);
+        lcd.locate(0,1);
+        lcd.printf("%d%d%d%d",ch4,ch5,ch6,ch7);
+
+        wait(0.01);
+    }
+}
+