diff options
Diffstat (limited to 'hw/lumintop/fw3x-lume1/hwdef.c')
| -rw-r--r-- | hw/lumintop/fw3x-lume1/hwdef.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/hw/lumintop/fw3x-lume1/hwdef.c b/hw/lumintop/fw3x-lume1/hwdef.c index 0a8a62e..791a080 100644 --- a/hw/lumintop/fw3x-lume1/hwdef.c +++ b/hw/lumintop/fw3x-lume1/hwdef.c @@ -108,3 +108,35 @@ bool gradual_tick_main(uint8_t gt) { return false; // not done yet } +////////// external temperature sensor ////////// + +void hwdef_set_admux_therm() { + // put the ADC in temperature mode + // ADCSRB: [VDEN, VDPD, -, -, ADLAR, ADTS2, ADTS1, ADTS0] + ADCSRB = (1 << ADLAR); // left-adjust, free-running + // DS table 19-3, 19-4 + // [refs1, refs0, refen, adc0en, mux3, mux2, mux1, mux0] + // refs=0b00 : VCC (2.5V) + // mux=0b1011 : ADC11 (pin PC2) + ADMUX = ADMUX_THERM_EXTERNAL_SENSOR; + // other stuff is already set, so no need to re-set it +} + +uint16_t temp_raw2cooked(uint16_t measurement) { + // In: (raw ADC average) << 6 + // Out: Kelvin << 6 + /* notes from old versions of the code... + // Used for Lume1 Driver: MCP9700 - T_Celsius = 100*(VOUT - 0.5V) + // ADC is 2.5V reference, 0 to 1023 + // due to floating point, this calculation takes 916 extra bytes + // (should use an integer equivalent instead) + //#define EXTERN_TEMP_FORMULA(m) (((m)-205)/4.09) + //int16_t celsius = (((measurement-205)/4.09)) + THERM_CAL_OFFSET + (int16_t)therm_cal_offset; + */ + + // this formula could probably be simplified... but meh, it works + uint16_t k6 = ((uint32_t)(measurement - (205 << 6)) * 100 / 409) + + (273 << 6); // convert back from C to K + return k6; +} + |