Revision 0:a576b66395ed, committed 2016-10-19

Comitter:

maximusismax

Date:

Wed Oct 19 10:19:57 2016 +0000

Commit message:

INA219 Library (Author: Jack Cosslett)

Changed in this revision

diff -r 000000000000 -r a576b66395ed INA219.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/INA219.cpp	Wed Oct 19 10:19:57 2016 +0000
@@ -0,0 +1,51 @@
+#include "INA219.h"
+
+INA219::INA219(I2C& theI2C, char address)
+    :i2c(theI2C), i2cAddress(address)
+{
+    init();
+}
+
+void INA219::init()
+{
+    //set up config register            //256 averages          //continuous shunt voltage conversion
+    short write_byte = CONF_DEFAULT & ~_BV(BRNG);
+    
+    write(REG_CONF, write_byte);
+    //set up calibration (full range ~5A)
+    write(REG_CAL, 0x14F7);
+}
+
+void INA219::write(INA219REG reg, short value)
+{
+    shortToChar stc;
+    char cmd[3];
+    stc.u16 = value;
+    
+    cmd[0] = reg;
+    cmd[1] = stc.u8[1];
+    cmd[2] = stc.u8[0];
+    
+    i2c.write(i2cAddress,cmd,3);
+}
+
+short INA219::read(INA219REG reg)
+{
+    shortToChar stc;
+    
+    char cmd[2];
+    cmd[0] = reg;
+    i2c.write(i2cAddress,cmd,1);
+    
+    i2c.read(i2cAddress, cmd, 2);
+    stc.u8[1] = cmd[0];
+    stc.u8[0] = cmd[1];
+    
+    return (stc.u16);
+}
+
+float INA219::getCurrent()
+{
+    short curr = read(REG_CURR);
+    return (float)curr / 6554;
+}
\ No newline at end of file

diff -r 000000000000 -r a576b66395ed INA219.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/INA219.h	Wed Oct 19 10:19:57 2016 +0000
@@ -0,0 +1,85 @@
+/*
+ * ina226.h
+ *
+ * driver for INA219 current monitor chip
+ *
+ * Created: 03/11/2015 17:13:11
+ *  Author: Jack
+ */ 
+
+
+#ifndef INA219_H_
+#define INA219_H_
+
+#include "mbed.h"
+
+#define INA219_1    0x40
+#define INA219_2    0x41
+
+/*
+//INA226 register addresses
+#define REG_CONF    0x00
+#define REG_SHNT    0x01
+#define REG_BUS     0x02
+#define REG_PWR     0x03
+#define REG_CURR    0x04
+#define REG_CAL     0x05
+*/
+enum INA219REG
+{
+    REG_CONF=0x00,
+    REG_SHNT=0x01,
+    REG_BUS=0x02,
+    REG_PWR=0x03,
+    REG_CURR=0x04,
+    REG_CAL=0x05,
+};
+//BITS
+//CONFIG REGISTER
+#define CONF_DEFAULT 0x399F
+
+#define RST 15 //reset bit
+#define BRNG 13 //bus voltage range: 0=16V, 1=32V
+#define PG1 12 // PGA gain
+#define PG0 11 // & range
+#define BADC4 10 // bus adc resolution/averaging
+#define BADC3 9 //
+#define BADC2 8 //
+#define BADC1 7 //
+#define SADC4 6 // shunt adc resolution/averaging
+#define SADC3 5 //
+#define SADC2 4 //
+#define SADC1 3 //
+#define MODE3 2 // operating mode
+#define MODE2 1 //
+#define MODE1 0 //
+
+#define _BV(bit) (1 << (bit))
+
+/*
+void ina226_init(I2C* i2c, char addr);
+void ina226_write(I2C* i2c, char addr, char reg, short value);
+short ina226_read(I2C* i2c, char addr, char reg);
+*/
+
+union shortToChar
+{
+    short u16;
+    char u8[2];
+};
+
+class INA219
+{
+    public:
+        INA219(I2C& theI2C, char address);
+        void init();
+        void write(INA219REG reg, short value);
+        short read(INA219REG reg);
+        float getCurrent();
+    private:
+        I2C& i2c;
+        char i2cAddress;
+};
+
+
+#endif /* INA219_H_ */
\ No newline at end of file