问题描述

通过CC2540作为从机，通过手机发送数据‘a’实现从机播放“收到”声音。

现在是的问题是通过设置定时器1来完成，
但是具体的声音“收到”的频率是怎么装载到定时器里面的，产生要的PWM波形。
我的程序只能改变占空比，只是发出声音的高低，还有就是网上都是音乐的频率，没有说话的
有没有取模软件把说话的声音频率算出来？？求大神指导，
#include
#include ""bcomdef.h""
#include ""OSAL.h""
#include ""pwm.h""

//pwm pins:
//P0.0
//P0.1

uint16 gRed;
uint16 gGreen;
uint16 gBlue;

void PWM_init()
{
//设置pwm端口为输出
P1DIR|= BV(0)|BV(1);
//设置pwm端口为外设端口，非gpio
P1SEL|= BV(0)|BV(1);
//由于uart等会占用我们当前使用的pwm端口，因此需要将uart等重映射到别的端口去。
PERCFG |= 0x40; // Move USART1&2 to alternate2 location so that T1 is visible

// Initialize Timer 1
T1CTL = 0x0C; // Div = 128 CLR MODE = Suspended

T1CCTL1 = 0x0C; // IM = 0; CMP = Clear output on compare; Mode = Compare
T1CCTL2 = 0x0C; // IM = 0; CMP = Clear output on compare; Mode = Compare
T1CCTL3 = 0x0C; // IM = 0 CMP = Clear output on compare; Mode = Compare
T1CNTL = 0; // Reset timer to 0;

T1CCTL0 = 0x4C;

T1CC0H = 0x01;

T1CC0L = 0x77;

T1CC1H = 0x01;

T1CC1L = 0x77;
T1CC2H = 0x01;

T1CC2L = 0x77;
T1CC3H = 0x01;

T1CC3L = 0x77;

EA=1;
IEN1 |= 0x02; // Enable T1 cpu interrupt
}

void pwmPulse(uint16 red uint16 green uint16 blue)
{
uint16 rgb;
// stop注意，不能加这句，加了周期偏差十几倍，具体原因未查明
//T1CTL &= BV(0)|BV(1);
#if 0
r=375;
g=1;
b=1;
#else
r=red;
g=green;
b=blue;
#endif
// Set up the timer registers

T1CC1L = (uint8)r;
T1CC1H = (uint8)(r >> 8);
T1CC2L = (uint8)g;
T1CC2H = (uint8)(g >> 8);
T1CC3L = (uint8)b;
T1CC3H = (uint8)(b >> 8);

// Reset timer
T1CNTL = 0;

// Start timer in modulo mode.
T1CTL |= 0x02;

}

void setRGB(uint16 red uint16 green uint16 blue)
{
gRed=red;
gGreen=green;
gBlue=blue;
}

//#pragma register_bank=2
#pragma vector = T1_VECTOR
__interrupt void pwmISR (void) {
uint8 flags = T1STAT;
// T1 ch 0
if (flags & 0x01){

pwmPulse(gRedgGreengBlue);

}T1STAT = ~ flags;

}

if ( events & SBP_START_DEVICE_EVT )
{
static uint8 count=1;
static uint8 updown=1;

if(updown)  count++;else  count--;if(count==200)  updown=0;if(count==1)  updown=1;//设置占空比setRGB(countcountcount);osal_start_timerEx( SimpleOsal_TaskID SBP_START_DEVICE_EVT 5 );return ( events ^ SBP_START_DEVICE_EVT );

}
// Discard unknown events
return 0;