Diff: SCP1000.h

Revision:

0:dfd0841721d5

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SCP1000.h	Tue Oct 05 19:34:40 2010 +0000
@@ -0,0 +1,84 @@
+#ifndef _SCP1000_H
+#define _SCP1000_H
+
+#include "mbed.h"
+
+class SCP1000 {
+    public:
+        SCP1000(PinName mosi, PinName miso, PinName sclk, PinName cs)
+            : m_spi(mosi, miso, sclk)
+            , m_cs(cs) {
+            m_cs=1;
+            m_spi.frequency(500000); // the fastest of the sensor
+            m_spi.format(8, 0); // duda son dos palabras de 8 bits? 
+            wait(0.5);
+            //------------------------------------------------
+            // pc.printf("RESET\r\n");
+            write_register(0x06,0x01);
+            wait(0.5);
+
+            // pc.printf("Initialize High Resolution Constant Reading Mode\r\n");
+            write_register(0x03,0x0A);
+            wait(0.5);
+        };
+        
+        ~SCP1000() { /* empty */ };
+        
+        unsigned long readPressure() {
+            unsigned long pressure_msb = read_register(PRESSURE);
+            pressure_msb &= 0x07;
+            unsigned long pressure_lsb = read_register16(PRESSURE_LSB);
+            unsigned long pressure = ((pressure_msb<<16)| pressure_lsb);
+            pressure /= 4;
+            
+            return pressure;
+        };
+        
+        float readTemperature() {
+            float temp_in = read_register16(TEMP);
+            temp_in /= 20;
+            return temp_in;
+        };
+        
+        
+    private:
+        static const char PRESSURE = 0x1F;   //Pressure 3 MSB
+        static const char PRESSURE_LSB = 0x20; //Pressure 16 LSB
+        static const char TEMP = 0x21;       //16 bit temp
+        SPI m_spi;
+        DigitalOut m_cs;
+        
+        char read_register(char register_name) {
+            register_name <<=2;
+            register_name &= 0xFC;
+            m_cs=0; //Select SPI device
+            m_spi.write(register_name); //Send register location
+            char register_value=m_spi.write(0x00);
+            m_cs=1;
+            return register_value;  
+        };
+
+        void write_register(char register_name, char register_value) {
+            register_name <<= 2;
+            register_name |= 0x02; //le estamos diciendo que escriba
+            m_cs=0; //Select SPI device
+            m_spi.write(register_name); //Send register location
+            m_spi.write(register_value); //Send value to record into register
+            m_cs=1;
+        }; 
+
+        float read_register16(char register_name) {   
+            register_name <<= 2;
+            register_name &= 0xFC; //Read command
+            m_cs=0; //Select SPI Device
+            m_spi.write(register_name); //Write byte to device
+            int in_byte1 = m_spi.write(0x00);    
+            int in_byte2 = m_spi.write(0x00);
+            m_cs=1;
+            float in_word= (in_byte1<<=8) | (in_byte2);   
+            return(in_word);
+        };
+
+};
+
+#endif // _SCP1000_H
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