The firmware is the following:
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| /******************************************************************************* | |
| * | |
| * MSP-EXP430G2_009: Basic use of PWM | |
| * | |
| ******************************************************************************* | |
| * FileName: main.c | |
| * Processor: MSP430G2231 | |
| * Complier: CCS 7.2.0.00013 | |
| * Author: Pedro Sánchez Ramírez (MrChunckuee) | |
| * Blog: http://mrchunckuee.blogspot.com/ | |
| * Email: mrchunckuee.psr@gmail.com | |
| * Description: For this example we will obtain a PWM in P1.6 (LED_GREEN), | |
| * using the Timer_A, the delay routine is very basic and it | |
| * is not the best option, but it fulfills the objective. | |
| ******************************************************************************* | |
| * Historial del firmware | |
| * Rev. Date Comment | |
| * v0.01 29/11/2017 - Testing using MSP430G2231 | |
| * - Modification to make the duty_cycle variable | |
| ******************************************************************************/ | |
| #include <msp430.h> | |
| unsigned char DutyPWM = 10; | |
| /********** P R O T O T Y P E S *************/ | |
| void MCU_Delayms(unsigned int time); | |
| int main(void){ | |
| WDTCTL = WDTPW | WDTHOLD; // stop watchdog timer | |
| P1DIR |= BIT6; // P1.6 output | |
| P1SEL |= BIT6; // P1.6 TA1/2 options | |
| P1OUT &= ~BIT6; // P1.6 set LOW (Green LED) | |
| CCR0 = 200-1; // PWM Period (Aprox. 5KHz) | |
| CCTL1 = OUTMOD_7; // CCR1 reset/set | |
| CCR1 = DutyPWM; // CCR1 PWM duty cycle | |
| TACTL = TASSEL_2 + MC_1; // SMCLK, up mode | |
| //_BIS_SR(CPUOFF); // Enter LPM0 | |
| while(1){ | |
| for(DutyPWM=10; DutyPWM<190; DutyPWM++){ | |
| CCR1 = DutyPWM; | |
| MCU_Delayms(100); | |
| } | |
| for(DutyPWM=190; DutyPWM>10; DutyPWM--){ | |
| CCR1 = DutyPWM; | |
| MCU_Delayms(100); | |
| } | |
| } | |
| } | |
| void MCU_Delayms(unsigned int time){ | |
| unsigned int delayCount; | |
| for (delayCount=0; delayCount<time; ++delayCount) | |
| __delay_cycles(1000); // 1ms = 1000 clocks at 1MHz | |
| return; | |
| } |
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