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b819fc53ca
Add digipot i2c control for MCP4451 Allow M907 to set i2c digipot currents in amps Fix Makefile to allow Azteeg motherboards Fix Makefile to allow Wire libraries only Add beeper pin for Azteeg X3 Pro
55 lines
1.5 KiB
C++
55 lines
1.5 KiB
C++
#include "Configuration.h"
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#ifdef DIGIPOT_I2C
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#include "Stream.h"
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#include "utility/twi.h"
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#include "Wire.h"
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// Settings for the I2C based DIGIPOT (MCP4451) on Azteeg X3 Pro
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#define DIGIPOT_I2C_FACTOR 106.7
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#define DIGIPOT_I2C_MAX_CURRENT 2.5
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static byte current_to_wiper( float current ){
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return byte(ceil(float((DIGIPOT_I2C_FACTOR*current))));
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}
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static void i2c_send(byte addr, byte a, byte b)
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{
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Wire.beginTransmission(addr);
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Wire.write(a);
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Wire.write(b);
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Wire.endTransmission();
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}
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// This is for the MCP4451 I2C based digipot
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void digipot_i2c_set_current( int channel, float current )
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{
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current = min( (float) max( current, 0.0f ), DIGIPOT_I2C_MAX_CURRENT);
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// these addresses are specific to Azteeg X3 Pro, can be set to others,
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// In this case first digipot is at address A0=0, A1= 0, second one is at A0=0, A1= 1
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byte addr= 0x2C; // channel 0-3
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if(channel >= 4) {
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addr= 0x2E; // channel 4-7
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channel-= 4;
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}
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// Initial setup
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i2c_send( addr, 0x40, 0xff );
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i2c_send( addr, 0xA0, 0xff );
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// Set actual wiper value
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byte addresses[4] = { 0x00, 0x10, 0x60, 0x70 };
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i2c_send( addr, addresses[channel], current_to_wiper(current) );
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}
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void digipot_i2c_init()
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{
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const float digipot_motor_current[] = DIGIPOT_I2C_MOTOR_CURRENTS;
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Wire.begin();
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// setup initial currents as defined in Configuration_adv.h
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for(int i=0;i<=sizeof(digipot_motor_current)/sizeof(float);i++) {
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digipot_i2c_set_current(i, digipot_motor_current[i]);
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}
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}
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#endif
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