Michael Spencer / Smoothie

Fork of Smoothie to port to mbed non-LPC targets.

Dependencies:   mbed

Fork of Smoothie by Stéphane Cachat

libs/Digipot.h@3:f151d08d335c, 2014-03-02 (annotated)

Committer:
Bigcheese
Date:
Sun Mar 02 06:33:08 2014 +0000
Revision:
3:f151d08d335c
Parent:
0:31e91bb0ef3c 
Bunch of stuff. Need to locally merge in updated USB changes.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
scachat 0:31e91bb0ef3c 1 #ifndef DIGIPOT_H
scachat 0:31e91bb0ef3c 2 #define DIGIPOT_H
scachat 0:31e91bb0ef3c 3
scachat 0:31e91bb0ef3c 4 #include "libs/Kernel.h"
scachat 0:31e91bb0ef3c 5 #include "I2C.h" // mbed.h lib
scachat 0:31e91bb0ef3c 6 #include "libs/utils.h"
scachat 0:31e91bb0ef3c 7 #include <string>
scachat 0:31e91bb0ef3c 8 #include <math.h>
scachat 0:31e91bb0ef3c 9
scachat 0:31e91bb0ef3c 10 class Digipot{
scachat 0:31e91bb0ef3c 11 public:
scachat 0:31e91bb0ef3c 12 Digipot(){ }
scachat 0:31e91bb0ef3c 13
scachat 0:31e91bb0ef3c 14 char current_to_wiper( double current ){
scachat 0:31e91bb0ef3c 15 return char(ceil(double((113.33*current))));
scachat 0:31e91bb0ef3c 16 }
scachat 0:31e91bb0ef3c 17
scachat 0:31e91bb0ef3c 18 void i2c_send( char first, char second, char third ){
scachat 0:31e91bb0ef3c 19 this->i2c->start();
scachat 0:31e91bb0ef3c 20 this->i2c->write(first);
scachat 0:31e91bb0ef3c 21 this->i2c->write(second);
scachat 0:31e91bb0ef3c 22 this->i2c->write(third);
scachat 0:31e91bb0ef3c 23 this->i2c->stop();
scachat 0:31e91bb0ef3c 24 }
scachat 0:31e91bb0ef3c 25
scachat 0:31e91bb0ef3c 26 void set_current( int channel, double current ){
scachat 0:31e91bb0ef3c 27
scachat 0:31e91bb0ef3c 28 current = min( max( current, 0.0L ), 2.0L );
scachat 0:31e91bb0ef3c 29
scachat 0:31e91bb0ef3c 30 // I2C com
scachat 0:31e91bb0ef3c 31 this->i2c = new mbed::I2C(p9, p10);
scachat 0:31e91bb0ef3c 32
scachat 0:31e91bb0ef3c 33 // Initial setup
scachat 0:31e91bb0ef3c 34 this->i2c_send( 0x58, 0x40, 0xff );
scachat 0:31e91bb0ef3c 35 this->i2c_send( 0x58, 0xA0, 0xff );
scachat 0:31e91bb0ef3c 36
scachat 0:31e91bb0ef3c 37 // Set actual wiper value
scachat 0:31e91bb0ef3c 38 char adresses[4] = { 0x00, 0x10, 0x60, 0x70 };
scachat 0:31e91bb0ef3c 39 this->i2c_send( 0x58, adresses[channel], this->current_to_wiper(current) );
scachat 0:31e91bb0ef3c 40
scachat 0:31e91bb0ef3c 41 }
scachat 0:31e91bb0ef3c 42
scachat 0:31e91bb0ef3c 43 mbed::I2C* i2c;
scachat 0:31e91bb0ef3c 44 };
scachat 0:31e91bb0ef3c 45
scachat 0:31e91bb0ef3c 46
scachat 0:31e91bb0ef3c 47 #endif