黄昏之星公式MSP430-pwm方波占空比频率可调

2020年10月13日发(作者：张惠春)

MSP430-pwm
调
方波占空比频率可

**** ************************************************** ****
*****************************
MSP430 Blink the LED Demo - Software Toggle P1.0

Description; Toggle P1.0 by xor'ing P1.0 inside of a
software loop.
ACLK = na, MCLK = SMCLK = default DCO

MSP430x5xx
-----------------
|| XIN|-
| | |
--|RST XOUT|-
| |
| P1.0|-->LED

J. Stevenson
Texas Instruments, Inc
July 2011
Built with Code Composer Studio v5
********************** ************************************
********** *******************


#include
#include
unsigned char LED_CODE[] =
{ 0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07, 0x7F, 0x6F,
0x77, 0x7C, 0x39,
0x5E, 0x79, 0x71 };
float i=1000,j=500;
int main(void)
{


float a,b;
WDTCTL = WDTPW + WDTHOLD; Stop
watchdog timer



if (CALBC1_1MHZ == 0xFF || CALDCO_1MHZ == 0xFF)
{
while (1); If calibration constants erased, trap
CPU!!




BCSCTL1 = CALBC1_1MHZ; Set range
DCOCTL = CALDCO_1MHZ; Set DCO step +
}
modulation




BCSCTL2 = SELM_1 + DIVS_3; set MCLK=DOC8
P1DIR |= 0x01; Set P1.0 to
output direction

引脚设置(暂时使用P1.2输出一路PWM)
P1SEL |= BIT6; TA1从P1.6输出
P1DIR |= BIT6; TA1从P1.6输出
P2DIR |= 0xff;
P2OUT |= 0XFF;

TACTL |= MC_1 +TASSEL_2+ID_0; 时钟源选择
SMCLK，增计数模式 TA设置
TACCTL1 = OUTMOD_7; 模式7 高电平PWM输出
PWM设置
init_TM1638();
for(;;)
{
TACCR0 = i;
TACCR1 = j;

if(Read_key()==0)

{
while(Read_key()==0);
i=i+10; 调频率
j=b*i100;
}
if(Read_key()==1)
{
while(Read_key()==1);
i=i-10; 调频率
j=b*i100;
}

if(Read_key()==2)
{
while(Read_key()==2);
j=j+10; 调占空比
}
if(Read_key()==3)
{
while(Read_key()==3);
j=j-10; 调占空比
}











b=j*100i; 占空比
Write_DATA(0x00, LED_CODE[(int)b10]);
Write_DATA(0x02, LED_CODE[(int)b%10]|0x80);
Write_DATA(0x04, LED_CODE[(int)(b*10)%10]);
a=1000000(8.0*i);频率
Write_DATA(0x08, LED_CODE[(int)a100]);
Write_DATA(0x0a, LED_CODE[(int)a10%10]);
Write_DATA(0x0c, LED_CODE[(int)a%10]|0x80);
Write_DATA(0x0e, LED_CODE[(int)(a*10)%10]);
}
}