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Fix: set digipot mcp4018 Vrefmax to 1.666V

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This commit is contained in:
Paweł Stawicki
2017-06-15 16:45:44 +02:00
committed by Scott Lahteine
parent ebe6719e12
commit 1e47c17b46
3 changed files with 118 additions and 14 deletions
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8
Marlin/digipot_mcp4018.cpp
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@ -34,17 +34,17 @@
#define DIGIPOT_I2C_ADDRESS 0x2F
#define DIGIPOT_A4988_Rsx 0.250
#define DIGIPOT_A4988_Vrefmax 5.0
#define DIGIPOT_A4988_Vrefmax 1.666
#define DIGIPOT_A4988_MAX_VALUE 127
#define DIGIPOT_A4988_Itripmax(Vref) ((Vref)/(8.0*DIGIPOT_A4988_Rsx))
#define DIGIPOT_A4988_FACTOR ((DIGIPOT_A4988_MAX_VALUE)/DIGIPOT_A4988_Itripmax(DIGIPOT_A4988_Vrefmax))
//TODO: MAX_CURRENT -0.5A ?? (currently set to 2A, max possible current 2.5A)
#define DIGIPOT_A4988_MAX_CURRENT (DIGIPOT_A4988_Itripmax(DIGIPOT_A4988_Vrefmax) - 0.5)
#define DIGIPOT_A4988_MAX_CURRENT 2.0
static byte current_to_wiper(const float current) {
return byte(CEIL(float(DIGIPOT_A4988_FACTOR) * current));
const int16_t value = ceil(float(DIGIPOT_A4988_FACTOR) * current);
return byte(constrain(value, 0, DIGIPOT_A4988_MAX_VALUE));
}
const uint8_t sda_pins[DIGIPOT_I2C_NUM_CHANNELS] = {