// 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));
}
// This is for the MCP4018 I2C based digipot
void digipot_i2c_set_current(int channel, float current) {
current = min(max(current, 0.0f), float(DIGIPOT_A4988_MAX_CURRENT));
i2c_send(channel, current_to_wiper(current));
}