Save lots of PROGMEM, ~20b SRAM with DIGIPOT_I2C

This commit is contained in:
Scott Lahteine
2017-06-06 06:10:10 -05:00
parent 4134a6b526
commit c9e3caf928
4 changed files with 53 additions and 28 deletions

View File

@ -37,11 +37,11 @@
#define DIGIPOT_I2C_MAX_CURRENT 2.5
#endif
static byte current_to_wiper(float current) {
static byte current_to_wiper(const float current) {
return byte(ceil(float((DIGIPOT_I2C_FACTOR * current))));
}
static void i2c_send(byte addr, byte a, byte b) {
static void i2c_send(const byte addr, const byte a, const byte b) {
Wire.beginTransmission(addr);
Wire.write(a);
Wire.write(b);
@ -49,7 +49,7 @@ static void i2c_send(byte addr, byte a, byte b) {
}
// This is for the MCP4451 I2C based digipot
void digipot_i2c_set_current(int channel, float current) {
void digipot_i2c_set_current(uint8_t 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
@ -69,11 +69,11 @@ void digipot_i2c_set_current(int channel, float current) {
}
void digipot_i2c_init() {
const float digipot_motor_current[] = DIGIPOT_I2C_MOTOR_CURRENTS;
static const float digipot_motor_current[] PROGMEM = DIGIPOT_I2C_MOTOR_CURRENTS;
Wire.begin();
// setup initial currents as defined in Configuration_adv.h
for (int i = 0; i < COUNT(digipot_motor_current); i++)
digipot_i2c_set_current(i, digipot_motor_current[i]);
for (uint8_t i = 0; i < COUNT(digipot_motor_current); i++)
digipot_i2c_set_current(i, pgm_read_float(&digipot_motor_current[i]));
}
#endif // DIGIPOT_I2C