Diff: AD8556.cpp

Revision:

0:05eaa16f3327

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/AD8556.cpp	Wed Sep 11 13:30:19 2013 +0000
@@ -0,0 +1,204 @@
+/**
+ * @brief AD8556:  Digitally Programmable Sensor Signal Amplifier with EMI Filters
+ * http://www.analog.com/en/specialty-amplifiers/instrumentation-amplifiers/ad8556/products/product.html
+ * @date 05/09/2013
+ * @author F.BLANC LAAS-CNRS
+ * http://homepages.laas.fr/fblanc/
+ */
+
+#include "AD8556.h"
+
+/**
+ * @brief Constructor.
+ *
+ * @param dig
+
+ */
+AD8556::AD8556(PinName dig) : _dig(dig)
+{
+}
+
+/**
+ * @brief Destructor.
+ */
+AD8556::~AD8556()
+{
+}
+
+
+
+
+
+/**
+   * @brief init
+   * @param mode
+   * @param First_Stage_Gain_Code
+   * @param Second_Stage_Gain_Code
+   * @param Vdac_Code
+   */
+int AD8556::init(unsigned char mode,unsigned char First_Stage_Gain_Code, unsigned char Second_Stage_Gain_Code,unsigned char Vdac_Code)
+{
+    trame(ADC_Second_Stage_Gain_Code,mode,Second_Stage_Gain_Code);
+    trame(ADC_First_Stage_Gain_Code,mode,First_Stage_Gain_Code);
+    trame(ADC_Output_Offset_Code,mode,Vdac_Code);
+    return 0;
+}
+
+/**
+   * @brief trame
+   * @param parameter
+   * @param mode
+   * @param data
+   */
+void AD8556::trame(unsigned char parameter,unsigned char mode,unsigned char data)
+{
+    //12-Bit Start of Packet 1000 0000 0001
+    write_bit(1);
+    for(unsigned char i=0; i<10; ++i)
+        write_bit(0);
+    write_bit(1);
+    //2-Bit Function
+    switch (mode) {
+        case  ADC_MODE_SENSE_CURENT :
+            write_bit(0);
+            write_bit(0);
+            break;
+        case  ADC_MODE_SIMULATION :
+            write_bit(0);
+            write_bit(1);
+            break;
+        case  ADC_MODE_FUSE :
+            write_bit(1);
+            write_bit(0);
+            break;
+        case  ADC_MODE_READ :
+            write_bit(1);
+            write_bit(1);
+            break;
+    }
+    //2-Bit Parameter
+    switch (parameter) {
+        case  ADC_Second_Stage_Gain_Code :
+            write_bit(0);
+            write_bit(0);
+            break;
+        case  ADC_First_Stage_Gain_Code :
+            write_bit(0);
+            write_bit(1);
+            break;
+        case  ADC_Output_Offset_Code :
+            write_bit(1);
+            write_bit(0);
+            break;
+        case  ADC_Other_Functions :
+            write_bit(1);
+            write_bit(1);
+            break;
+    }
+
+
+    //2-Bit Dummy 10
+    write_bit(1);
+    write_bit(0);
+    //8-Bit Value
+    for(char i=0; i<8; ++i) {
+        write_bit( data & (0x80>>i) );
+    }
+    //12-Bit End of Packet 1000 0000 0001
+    write_bit(0);
+    for(unsigned char i=0; i<10; ++i)
+        write_bit(1);
+    write_bit(0);
+}
+
+/**
+ * @brief write_bit
+ *
+ * @param bit 1 or 0
+ */
+void AD8556::write_bit(unsigned char bit)
+{
+    _dig = 0;
+    _dig.output();
+    wait_us(10);
+    _dig = 1;
+    if ( bit )
+        wait_us(50); //1
+    wait_us(5);
+    _dig = 0;
+    wait_us(10);
+}
+
+/**
+   * @brief vdac
+   * @param vdac consigne (volt)
+   * @param vdd positive voltage supply (volt)
+   * @param vss nagative voltage supply (volt)
+   * @param mode
+   */
+void AD8556::prog_vdac(float vdac,float vdd,float vss, unsigned char mode)
+{
+    unsigned char Vdac_Code;
+    Vdac_Code=256*(vdac-vss)/(vdd-vss)-0.5;
+    trame(ADC_Output_Offset_Code,mode,Vdac_Code);
+
+}
+/**
+  * @brief prog_gain
+  * @param gain 70 to 1280
+  * @param mode
+  */
+void AD8556::prog_gain(float gain, unsigned char mode)
+{
+float Second_Stage_Gain;
+int First_Stage_Gain_Code;
+    if (gain<70) {
+        trame(ADC_Second_Stage_Gain_Code,mode,0);
+        trame(ADC_First_Stage_Gain_Code,mode,0);
+    } else if (gain<100) {
+        trame(ADC_Second_Stage_Gain_Code,mode,0);
+        Second_Stage_Gain=17.5;
+        First_Stage_Gain_Code=(int)(((gain/Second_Stage_Gain)-4.0)*66.7);
+        trame(ADC_First_Stage_Gain_Code, mode, First_Stage_Gain_Code);
+    } else if (gain<140) {
+        trame(ADC_Second_Stage_Gain_Code,mode,1);
+        int First_Stage_Gain_Code=(int)gain/25;
+        Second_Stage_Gain=25;
+        First_Stage_Gain_Code=(int)(((gain/Second_Stage_Gain)-4.0)*66.7);
+        trame(ADC_First_Stage_Gain_Code, mode, First_Stage_Gain_Code);
+    } else if (gain<200) {
+        trame(ADC_Second_Stage_Gain_Code,mode,2);
+        Second_Stage_Gain=35;
+        First_Stage_Gain_Code=(int)(((gain/Second_Stage_Gain)-4.0)*66.7);
+        trame(ADC_First_Stage_Gain_Code, mode, First_Stage_Gain_Code);
+    } else if (gain<280) {
+        trame(ADC_Second_Stage_Gain_Code,mode,3);
+        Second_Stage_Gain=50;
+        First_Stage_Gain_Code=(int)(((gain/Second_Stage_Gain)-4.0)*66.7);
+        trame(ADC_First_Stage_Gain_Code, mode, First_Stage_Gain_Code);
+    } else if (gain<400) {
+        trame(ADC_Second_Stage_Gain_Code,mode,4);
+        Second_Stage_Gain=70;
+        First_Stage_Gain_Code=(int)(((gain/Second_Stage_Gain)-4.0)*66.7);
+        trame(ADC_First_Stage_Gain_Code, mode, First_Stage_Gain_Code);
+    } else if (gain<560) {
+        trame(ADC_Second_Stage_Gain_Code,mode,5);
+        Second_Stage_Gain=100;
+        First_Stage_Gain_Code=(int)(((gain/Second_Stage_Gain)-4.0)*66.7);
+        trame(ADC_First_Stage_Gain_Code, mode, First_Stage_Gain_Code);
+    } else if (gain<800) {
+        trame(ADC_Second_Stage_Gain_Code,mode,6);
+        Second_Stage_Gain=140;
+        First_Stage_Gain_Code=(int)(((gain/Second_Stage_Gain)-4.0)*66.7);
+        trame(ADC_First_Stage_Gain_Code, mode, First_Stage_Gain_Code);
+    } else if (gain<1280) {
+        trame(ADC_Second_Stage_Gain_Code,mode,7);
+        Second_Stage_Gain=200;
+        First_Stage_Gain_Code=(int)(((gain/Second_Stage_Gain)-4.0)*66.7);
+        trame(ADC_First_Stage_Gain_Code, mode, First_Stage_Gain_Code);
+    } else if (gain>=1280) {
+        trame(ADC_Second_Stage_Gain_Code,mode,7);
+        trame(ADC_First_Stage_Gain_Code, mode, 127);
+    }
+   
+}
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