Jack Cosslett / Mbed 2 deprecated frdm_gpio

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Dependencies:   USBDevice mbed

ina226.cpp@1:5dc94660e311, 2016-03-17 (annotated)

Committer:
Caconym
Date:
Thu Mar 17 14:53:03 2016 +0000
Revision:
1:5dc94660e311
Parent:
0:4318f664a8e1 
yo

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Caconym 0:4318f664a8e1 1 #include "ina226.h"
Caconym 0:4318f664a8e1 2
Caconym 1:5dc94660e311 3 INA226::INA226(I2C& theI2C, char address)
Caconym 1:5dc94660e311 4 :i2c(theI2C), i2cAddress(address)
Caconym 1:5dc94660e311 5 {
Caconym 1:5dc94660e311 6 init();
Caconym 1:5dc94660e311 7 }
Caconym 1:5dc94660e311 8
Caconym 1:5dc94660e311 9 void INA226::init()
Caconym 0:4318f664a8e1 10 {
Caconym 0:4318f664a8e1 11 //set up config register //256 averages //continuous shunt voltage conversion
Caconym 0:4318f664a8e1 12 short write_byte = CONF_DEFAULT |_BV(AVG2) | _BV(AVG0) | _BV(MODE3) | _BV(MODE1);
Caconym 0:4318f664a8e1 13
Caconym 0:4318f664a8e1 14 write(REG_CONF, write_byte);
Caconym 0:4318f664a8e1 15 //set up calibration (full range ~1.6A)
Caconym 0:4318f664a8e1 16 write(REG_CAL, 0x0800);
Caconym 0:4318f664a8e1 17 }
Caconym 0:4318f664a8e1 18
Caconym 0:4318f664a8e1 19 void INA226::write(INA226REG reg, short value)
Caconym 0:4318f664a8e1 20 {
Caconym 0:4318f664a8e1 21 shortToChar stc;
Caconym 0:4318f664a8e1 22 char cmd[3];
Caconym 0:4318f664a8e1 23 stc.u16 = value;
Caconym 0:4318f664a8e1 24
Caconym 0:4318f664a8e1 25 cmd[0] = reg;
Caconym 0:4318f664a8e1 26 cmd[1] = stc.u8[1];
Caconym 0:4318f664a8e1 27 cmd[2] = stc.u8[0];
Caconym 0:4318f664a8e1 28
Caconym 1:5dc94660e311 29 i2c.write(i2cAddress,cmd,3);
Caconym 0:4318f664a8e1 30 }
Caconym 0:4318f664a8e1 31
Caconym 0:4318f664a8e1 32 short INA226::read(INA226REG reg)
Caconym 0:4318f664a8e1 33 {
Caconym 0:4318f664a8e1 34 shortToChar stc;
Caconym 0:4318f664a8e1 35
Caconym 0:4318f664a8e1 36 char cmd[2];
Caconym 0:4318f664a8e1 37 cmd[0] = reg;
Caconym 1:5dc94660e311 38 i2c.write(i2cAddress,cmd,1);
Caconym 0:4318f664a8e1 39
Caconym 1:5dc94660e311 40 i2c.read(i2cAddress, cmd, 2);
Caconym 0:4318f664a8e1 41 stc.u8[1] = cmd[0];
Caconym 0:4318f664a8e1 42 stc.u8[0] = cmd[1];
Caconym 0:4318f664a8e1 43
Caconym 0:4318f664a8e1 44 return (stc.u16);
Caconym 1:5dc94660e311 45 }
Caconym 1:5dc94660e311 46
Caconym 1:5dc94660e311 47 float INA226::getCurrent()
Caconym 1:5dc94660e311 48 {
Caconym 1:5dc94660e311 49 short curr = read(REG_CURR);
Caconym 1:5dc94660e311 50 return curr/20;
Caconym 0:4318f664a8e1 51 }