diff options
| -rw-r--r-- | hwdef-Emisar_D1Sv2.h | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/hwdef-Emisar_D1Sv2.h b/hwdef-Emisar_D1Sv2.h index 6895e73..e1f8029 100644 --- a/hwdef-Emisar_D1Sv2.h +++ b/hwdef-Emisar_D1Sv2.h @@ -58,11 +58,29 @@ //#define PWM2_LVL OCR1B // OCR1B is the output compare register for PB1 +#define USE_VOLTAGE_DIVIDER // use a dedicated pin, not VCC, because VCC input is flattened +#define VOLTAGE_PIN PA3 // Pin 4 / PA3 / ADC0 +#define VOLTAGE_ADC_DIDR ADC0D // digital input disable pin for PA3 +// DS tables 19-3, 19-4 +// Bit 7 6 5 4 3 2 1 0 +// REFS1 REFS0 REFEN ADC0EN MUX3 MUX2 MUX1 MUX0 +// MUX[3:0] = 0, 0, 0, 0 for ADC0 / PA3 +// divided by ... +// REFS[1:0] = 1, 0 for internal 1.1V reference +// other bits reserved +#define ADMUX_VOLTAGE_DIVIDER 0b10000000 #define ADC_PRSCL 0x06 // clk/64 -// average drop across diode on this hardware -#ifndef VOLTAGE_FUDGE_FACTOR -#define VOLTAGE_FUDGE_FACTOR 4 // add 0.20V (measured 0.22V) +// Raw ADC readings at 4.4V and 2.2V +// calibrate the voltage readout here +// estimated / calculated values are: +// (voltage - D1) * (R2/(R2+R1) * 256 / 1.1) +// D1, R1, R2 = 0, 330, 100 +#ifndef ADC_44 +#define ADC_44 235 +#endif +#ifndef ADC_22 +#define ADC_22 116 #endif #define TEMP_CHANNEL 0b00001111 |