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- #include "Configuration.h"
- #ifdef DIGIPOT_I2C
- #include "Stream.h"
- #include "utility/twi.h"
- #include "Wire.h"
- // Settings for the I2C based DIGIPOT (MCP4451) on Azteeg X3 Pro
- #if MB(5DPRINT)
- #define DIGIPOT_I2C_FACTOR 117.96
- #define DIGIPOT_I2C_MAX_CURRENT 1.736
- #else
- #define DIGIPOT_I2C_FACTOR 106.7
- #define DIGIPOT_I2C_MAX_CURRENT 2.5
- #endif
- static byte current_to_wiper( float current ){
- return byte(ceil(float((DIGIPOT_I2C_FACTOR*current))));
- }
- static void i2c_send(byte addr, byte a, byte b)
- {
- Wire.beginTransmission(addr);
- Wire.write(a);
- Wire.write(b);
- Wire.endTransmission();
- }
- // This is for the MCP4451 I2C based digipot
- void digipot_i2c_set_current( int channel, float current )
- {
- current = min( (float) max( current, 0.0f ), DIGIPOT_I2C_MAX_CURRENT);
- // these addresses are specific to Azteeg X3 Pro, can be set to others,
- // In this case first digipot is at address A0=0, A1= 0, second one is at A0=0, A1= 1
- byte addr= 0x2C; // channel 0-3
- if(channel >= 4) {
- addr= 0x2E; // channel 4-7
- channel-= 4;
- }
- // Initial setup
- i2c_send( addr, 0x40, 0xff );
- i2c_send( addr, 0xA0, 0xff );
- // Set actual wiper value
- byte addresses[4] = { 0x00, 0x10, 0x60, 0x70 };
- i2c_send( addr, addresses[channel], current_to_wiper(current) );
- }
- void digipot_i2c_init()
- {
- const float digipot_motor_current[] = DIGIPOT_I2C_MOTOR_CURRENTS;
- Wire.begin();
- // setup initial currents as defined in Configuration_adv.h
- for(int i=0;i<=sizeof(digipot_motor_current)/sizeof(float);i++) {
- digipot_i2c_set_current(i, digipot_motor_current[i]);
- }
- }
- #endif
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