Diff: AFE_4404.h

Revision:

0:e9068fdddb58

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/AFE_4404.h	Thu May 04 11:56:07 2017 +0000
@@ -0,0 +1,75 @@
+#ifndef AFE_4404_H
+#define AFE_4404_H
+
+#include "mbed.h"
+
+#define LOWER_BYTE_MASK     0x000000FF
+#define SIGN_EXT            0xFF000000
+#define SIGN_MASK           0x00800000
+#define BITS_PER_BYTE       8
+#define NUM_REGISTERS       38
+
+class AFE_4404 {
+    
+    public:
+    
+        AFE_4404(PinName rxSupplyEn, PinName txSupplyEn, PinName resetz, 
+            PinName powerEn, PinName drdy, PinName clk, PinName sda, PinName scl);
+        
+        void initPorts(void);
+        void initPowerSupply(void);
+        void initRegisters(void);
+        void initClock(void);
+        void powerUpSequence(void);
+        
+        void inline enableWriteMode(void) {
+            _writeBuffer[0] = 0x00;    // AFE register address 0x00
+            // write 0 to REG_READ bit in register 0x00 to enable readout 
+            // of write registers
+            _writeBuffer[1] = 0x00;    
+            _writeBuffer[2] = 0x00;
+            _writeBuffer[3] = 0x00;
+            _i2c.write(_address, _writeBuffer, 4);
+        }
+        
+        void inline enableReadMode(void) {
+            _writeBuffer[0] = 0x00;    // AFE register address 0x00
+            // write 1 to REG_READ bit in register 0x00 to enable writes to 
+            // write registers
+            _writeBuffer[1] = 0x00;    
+            _writeBuffer[2] = 0x00;
+            _writeBuffer[3] = 0x01;
+            _i2c.write(_address, _writeBuffer, 4);           
+        }  
+        
+        void inline disableIRQ(void) {
+            _drdy.disable_irq();
+        }
+
+        void inline enableIRQ(void) {
+            _drdy.enable_irq();
+        }
+        
+        void getData(void);
+        void writeData(uint8_t reg, uint32_t data);
+        uint32_t readData(uint8_t reg, bool adc);
+        
+        
+    private:
+        DigitalOut  _rxSupplyEn;
+        DigitalOut  _txSupplyEn;
+        DigitalOut  _resetz;
+        DigitalOut  _powerEn;
+        
+        InterruptIn _drdy;
+        PwmOut      _clk;
+        I2C         _i2c;
+        
+        int _address;
+        char _writeBuffer[5];
+        char _readBuffer[5];
+        // temporary variable to prevent multiple allocations
+        uint32_t _tempData;
+};
+
+#endif
\ No newline at end of file