MSP430, CCS, Timer, pwmLED

MSP430, CCS, Timer, pwmLED

※ msp430.h 를 사용하는 소스입니다.

Did you have a look at the example codes for the MCU that is provided by TI for almost every processor?

www.ti.com/lit/zip/slac536

The following examples show how to set up the clocks:

msp430fr59xx_cs_01.c       Configure MCLK for 8MHz operation
msp430fr59xx_cs_02.c       Configure MCLK for 16MHz operation
msp430fr59xx_cs_03.c       Output 32768Hz crystal on XT1 and observe failsafe
msp430fr59xx_cs_04.c       ACLK = XT1 = 32768Hz, SMCLK= XT2 = 8MHz, MCLK = DCO
msp430fr59xx_cs_05.c       Using LFXT in bypass mode, failsafe operation shown

0. 참고 사항

• C:\ti\msp\MSP430Ware_3_80_04_05\examples\devices\MSP430FR5xx_6xx\MSP430FR5x8x_MSP430FR692x_MSP430FR6x7x_MSP430FR6x8x_Code_Examples\C
  
• http://e2e.ti.com/support/microcontrollers/msp430/f/166/p/368560/1297094
• https://github.com/achopra6/MSP430FR6989/blob/master/timer.c
• http://www.ti.com/lit/ds/symlink/msp430fr6989.pdf
• http://www.ti.com/lit/ug/slau367o/slau367o.pdf

출처: http://coyoteugly.tistory.com/188 [마이콤 개발자를 위한 여행]

0. 참고 사항

• C:\ti\msp\MSP430Ware_3_80_04_05\examples\devices\MSP430FR5xx_6xx\MSP430FR5x8x_MSP430FR692x_MSP430FR6x7x_MSP430FR6x8x_Code_Examples
  
• www.ti.com/lit/zip/slac536
  
• http://www.ti.com/lit/ug/slau627a/slau627a.pdf
  
• http://www.ti.com/lit/ds/symlink/msp430fr6989.pdf
• http://www.ti.com/lit/ug/slau367o/slau367o.pdf

1. 소스 설명

full 소스는 아래 github를 통해 확인하세요.

8MHz Clock
P1.3 / TA1.2

#include <msp430.h> #include <msp430fr6989.h> // it's same with msp430.h int main(void) {     unsigned int i, duty = 500;     WDTCTL = WDTPW | WDTHOLD;                 // Stop WDT     // Configure GPIO     P1DIR |= BIT3;                     // P1.2 and P1.3 output     P1SEL0 |= BIT3;                    // P1.2 and P1.3 options select     // Disable the GPIO power-on default high-impedance mode to activate     // previously configured port settings     PM5CTL0 &= ~LOCKLPM5;     CSCTL0_H = CSKEY >> 8;                    // Unlock CS registers     CSCTL1 = DCOFSEL_6;                       // Set DCO to 8MHz     CSCTL2 = SELA__VLOCLK | SELS__DCOCLK | SELM__DCOCLK;// Set ACLK = VLO; SMCLK = DCO/8     CSCTL3 = DIVA__8 | DIVS__8 | DIVM__8;     // Set all dividers     CSCTL0_H = 0;     TA1CCR0 = 1000-1;                         // PWM Period     TA1CCTL2 = OUTMOD_7;                      // CCR2 reset/set     TA1CCR2 = duty;                            // CCR2 PWM duty cycle     TA1CTL = TASSEL__SMCLK | MC__UP | TACLR;  // SMCLK, up mode, clear TAR     //__bis_SR_register(LPM0_bits);             // Enter LPM0     __no_operation();                         // For debugger     while(1)     {         for(i=0; i<50; i++)             _delay_cycles(8000);                // Wait 8,000 CPU Cycles, 1ms         duty += 100;         if (duty >= 1000)             duty = 0;         TA1CCR2 = duty;                            // CCR2 PWM duty cycle     } }

2. 소스

• https://github.com/sglee0223/msp430/tree/master/pwmLED
  

3. 결과

TA1CCR2= 500

TA1CCR2= 250