101 lines
2.6 KiB
C
101 lines
2.6 KiB
C
#include <msp430.h>
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#include <msp430xgeneric.h>
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#include <stdint.h>
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#include "mw_main.h"
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#define HARDWARE_CFG_INPUT_CHANNEL ( ADC12INCH_13 )
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#define BATTERY_SENSE_INPUT_CHANNEL ( ADC12INCH_15 )
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#define LIGHT_SENSE_INPUT_CHANNEL ( ADC12INCH_1 )
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#define ENABLE_ADC() { ADC12CTL0 |= ADC12ON; ADC12CTL0 |= ADC12ENC + ADC12SC; }
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#define DISABLE_ADC() { ADC12CTL0 &= ~ADC12ENC; ADC12CTL0 &= ~ADC12ON; }
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#define CLEAR_START_ADDR() { ADC12CTL1 &= 0x0FFF; }
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const double CONVERSION_FACTOR_BATTERY = ((24300.0+38300.0)*2.5*1000.0)/(4095.0*24300.0);
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#define BATTERY_FULL_LEVEL (4140)
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#define BATTERY_CRITICAL_LEVEL (3300)
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#define BATTERY_LEVEL_RANGE (BATTERY_FULL_LEVEL - BATTERY_CRITICAL_LEVEL)
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/*! conversion factor */
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const double CONVERSION_FACTOR = 2.5*10000.0/4096.0;
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void mw_init_adc(void)
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{
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REFCTL0 = REFMSTR | REFTCOFF;
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LIGHT_SENSE_INIT();
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BATTERY_SENSE_INIT();
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HARDWARE_CFG_SENSE_INIT();
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/* allow conditional request for modosc */
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UCSCTL8 |= MODOSCREQEN;
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/* select ADC12SC bit as sample and hold source (00)
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* and use pulse mode
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* use modosc / 8 because frequency must be 0.45 MHz to 2.7 MHz (0.625 MHz)
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*/
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ADC12CTL1 = ADC12CSTARTADD_0 + ADC12SHP + ADC12SSEL_0 + ADC12DIV_7;
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/* 12 bit resolution, only use reference when doing a conversion */
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ADC12CTL2 = ADC12TCOFF + ADC12RES_2 + ADC12REFBURST;
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/* setup input channels */
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ADC12MCTL0 = HARDWARE_CFG_INPUT_CHANNEL + ADC12EOS;
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ADC12MCTL1 = BATTERY_SENSE_INPUT_CHANNEL + ADC12EOS;
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ADC12MCTL2 = LIGHT_SENSE_INPUT_CHANNEL + ADC12EOS;
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}
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unsigned int mw_get_battery_adc_val(void)
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{
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BATTERY_SENSE_ENABLE();
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/* low_bat_en assertion to bat_sense valid is ~100 ns */
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/* Start battery sense conversion */
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CLEAR_START_ADDR();
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ADC12CTL1 |= ADC12CSTARTADD_1;
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ENABLE_ADC();
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/* WaitForAdcBusy(); */
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while (ADC12CTL1 & ADC12BUSY)
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nop();
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/* Convert the ADC count for the battery input into a voltage
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* ADC12MEM1: Counts Battery Voltage in ADC counts
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* Result: Battery voltage in millivolts */
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BATTERY_SENSE_DISABLE();
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return (unsigned int)(CONVERSION_FACTOR_BATTERY * (double)ADC12MEM1);
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}
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uint8_t mw_get_battery_percentage_from_val(unsigned int BattVal)
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{
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if (BattVal > BATTERY_FULL_LEVEL)
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BattVal = BATTERY_FULL_LEVEL;
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if (BattVal < BATTERY_CRITICAL_LEVEL)
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BattVal = 0;
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else
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BattVal -= BATTERY_CRITICAL_LEVEL;
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BattVal = (BattVal > 0) ? (BattVal * 10 / (BATTERY_LEVEL_RANGE / 10)) : 0;
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return (unsigned char)BattVal;
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}
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uint16_t mw_get_amblight_adc_val(void)
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{
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LIGHT_SENSE_ENABLE();
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CLEAR_START_ADDR();
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ADC12CTL1 |= ADC12CSTARTADD_2;
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ENABLE_ADC();
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/* WaitForAdcBusy(); */
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while (ADC12CTL1 & ADC12BUSY)
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nop();
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LIGHT_SENSE_DISABLE();
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return ADC12MEM2;
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}
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