110 lines
2.6 KiB
C
110 lines
2.6 KiB
C
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#include"msp.h"
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#define UNLOCK_CS CS->KEY = CS_KEY_VAL
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#define LOCK_CS CS->KEY = 0
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#define DISABLE_WATCHDOG() WDT_A->CTL= WDT_A_CTL_PW | WDT_A_CTL_HOLD
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#define TIMER_PERIOD 20 // ms
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#define TIMER_DIV (8)
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#define TIMER_FCLK 3000000
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#define TIMER_PERIOD_TICKS (((TIMER_FCLK / TIMER_DIV) * TIMER_PERIOD) / 1000)
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//#define FULLRANGE
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#ifdef FULLRANGE
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#define DC_MIN 0.75
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#define DC_MAX 2.25
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#else
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#define DC_MIN 1
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#define DC_MAX 2
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#endif
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#define PERIOD TIMER_PERIOD_TICKS //20 ms
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#define DUTY_MAX ((unsigned int)(TIMER_PERIOD_TICKS/TIMER_PERIOD)*(DC_MAX)) //2 ms
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#define DUTY_MIN ((unsigned int)(TIMER_PERIOD_TICKS/TIMER_PERIOD)*(DC_MIN)) //1 ms
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#define DUTY_RANGE (DUTY_MAX - DUTY_MIN)
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#define ADC_MAX ((1 << 14) - 1)
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#define ADC_MIN 0
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#define ADC_RANGE ((ADC_MAX-ADC_MIN))
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#define ADC_TO_T(v) (DUTY_MIN + ((v - ADC_MIN)*DUTY_RANGE)/ADC_RANGE)
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void setup_pins(){
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// J4 - P2.4
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P2->DIR |= 0x10; //2.4
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P2->SEL0 |= 0x10; //2.4 SELECT TA0 MODULE
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P2->SEL1 &= ~0x10;//2.4 SELECT TA0 MODULE
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// J3 - P4.0
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P4->SEL0 |= 0x01; //4.0 SELECT ADC MODULE
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P4->SEL1 |= 0x01; //4.0 SELECT ADC MODULE
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}
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void setup_clock(){
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UNLOCK_CS;
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CS->CTL0 |= CS_CTL0_DCORSEL_1; // 3 MHz
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CS->CTL1 |= CS_CTL1_DIVS__8 | CS_CTL1_SELS__DCOCLK ; // SMCLOCK = DCLOCK/8
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CS->CTL0 |= CS_CTL0_DCOEN; //Enable
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LOCK_CS;
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}
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void setup_timer_a0(){
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TIMER_A0->CCR[0] = PERIOD; //base period
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TIMER_A0->CCR[1] = DUTY_MIN; //COMPARE to duty cycle
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TIMER_A0->CCTL[1] = OUTMOD_7; //RESET/SET
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TIMER_A0->EX0 = TAIDEX__1; // divide by 1
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TIMER_A0->CTL = TASSEL__SMCLK | ID__1 | MC__UP;//DOWN; //SMCLK, /1, UP
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}
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void setup_adc(){
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ADC14->CTL0 &= ~ADC14_CTL0_ENC; //ADC Disable
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ADC14->CTL0 = ADC14_CTL0_ON; //ADC ON
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ADC14->CTL0 |= ADC14_CTL0_SSEL__SMCLK; //USE SMCLK
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ADC14->CTL0 |= ADC14_CTL0_CONSEQ_2; //ADC14 Repeat Channel Sampling
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ADC14->CTL0 |= ADC14_CTL0_SHS_1; //USE TA0.1
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ADC14->CTL1 = ADC14_CTL1_RES__14BIT; //14 bit, 16 clk conversion
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ADC14->MCTL[0] = ADC14_MCTLN_VRSEL_0 | ADC14_MCTLN_INCH_13; // A13 ADC & V(R+) = AVCC, V(R-) = AVSS
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ADC14->IER0 |= ADC14_IER0_IE0; //ADC Interrupt
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ADC14->CTL0 |= ADC14_CTL0_ENC; //ADC Enable
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}
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void main(void){
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DISABLE_WATCHDOG();
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setup_pins();
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setup_clock();
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setup_timer_a0();
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setup_adc();
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SCB->SCR |= SCB_SCR_SLEEPONEXIT_Msk; // Enable sleep on exit from ISR
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__DSB(); // Ensures SLEEPONEXIT takes effect immediately
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__enable_irq(); // Enable global interrupt
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NVIC_EnableIRQ(ADC14_IRQn); //ENABLE IRQ ADC14
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__sleep(); //Sleep
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}
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void ADC14_IRQHandler(void) {
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TIMER_A0->CCR[1] = ADC_TO_T(ADC14->MEM[0]);
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}
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