Revision 0:5198300978ab, committed 2018-07-23

Comitter:

mederic

Date:

Mon Jul 23 12:58:05 2018 +0000

Commit message:

1st released

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ADS1100.cpp	Mon Jul 23 12:58:05 2018 +0000
@@ -0,0 +1,70 @@
+#include "ADS1100.h"
+
+#define ADS1100_DR_BIT  2
+#define ADS1100_SC_BIT  4
+#define ADS1100_ST_BIT  7
+#define ADS1100_BSY_BIT 7
+
+ADS1100::ADS1100(I2C* i2c, char ad):_i2c(i2c){
+    _addr = I2C_ADDR | (ad<<1);
+    config(false, 8, 1);
+}
+
+float ADS1100::read(float vdd){
+    int max = -_minCode * _gain;
+    return double(read_s16()) * vdd / double(max);
+}
+
+short ADS1100::read_s16(void){
+    return readReg(&_config);
+}
+
+short ADS1100::readReg(char* config){
+    char buf[3];
+    _i2c->read(_addr,buf,3);
+    *config = buf[2];
+    return (buf[0]<<8) | (buf[1]&0xff);
+}
+
+void ADS1100::config(bool single, char rate, char gain){
+    for(_config=0; _config<4; _config++){
+        if(1==(gain>>_config)){
+            break;
+        }
+    }
+    switch (rate){
+        case 128:
+            _config |= 0 << ADS1100_DR_BIT;
+            _minCode = -2048;
+            break;
+        case 32:
+            _config |= 1 << ADS1100_DR_BIT;
+            _minCode = -8192;
+            break;
+        case 16:
+            _config |= 2 << ADS1100_DR_BIT;
+            _minCode = -16384;
+            break;
+        case 8:
+            _config |= 3 << ADS1100_DR_BIT;
+            _minCode = -32768;
+            break;
+        default:
+            _config |= 3 << ADS1100_DR_BIT;
+            _minCode = -32768;
+            break;
+    };
+    _config |= single << ADS1100_SC_BIT;
+    _i2c->write(_addr, &_config, 1);
+    _gain = gain;
+}
+
+void ADS1100::startConvert(void){
+    _config |= 1<<ADS1100_BSY_BIT;
+    _i2c->write(_addr, &_config, 1);
+}
+
+bool ADS1100::busy(void){
+    readReg(&_config);
+    return _config & (1<<ADS1100_BSY_BIT);
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ADS1100.h	Mon Jul 23 12:58:05 2018 +0000
@@ -0,0 +1,61 @@
+#ifndef ADS1100_H
+#define ADS1100_H
+
+#include "mbed.h"
+
+class ADS1100{
+    
+    public:
+        enum state{
+            I2C_ADDR = 0x90,    //I2C adress 
+        };
+        
+        
+        /** Create ADC1100 instance
+        * @param *i2c initialized I2C bus to use
+        * @param ad   <0,7> marking code number for addr
+        */
+        ADS1100(I2C* i2c, char ad);
+        
+        /** Read outputCode 
+        * @return signed 16bit output code
+        */
+        short read_s16(void);
+        
+        /** Read output
+        * @param vdd proportional factor defualt=1.0
+        * @return vdd*code/codemax*gain
+        */
+        float read(float vdd=1.0);
+        
+        /** Configure ADS1100
+        * @param single true for single converion mode false for continuous
+        * @param rate can be 8,16,32,128 sample per sencods
+        * @param gain can be 1,2,4,8
+        */
+        void config(bool single, char rate, char gain);
+        
+        /** Read registers
+        * @param output cofig reg
+        * @return s16 code
+        */
+        short readReg(char* config);
+        
+        /** Initiate a conversion (single mode)
+        */
+        void startConvert(void);
+        
+        /** Check if converstion finished (continuous mode)
+        * @return bool true if busy
+        */
+        bool busy(void);
+        
+    private:
+        I2C*    _i2c;
+        char    _addr;
+        char    _config;
+        short   _minCode;
+        char    _gain;
+};
+
+#endif