CC2530之蜂鸣器设计问题。(如何对某一PIN脚以某频率触发？)

您好,

之后我先将Buzzer改至P1_6使用Timer3来做测试,将Code分为下列三部分

1. 初始化Buzzer之GPIO

void buzzerInit(void)

{

    PERCFG |= 0x20;             // Timer 3 Alternate location 2

    P1DIR |= 0x40;              // P1_6 = output

    P1SEL |= 0x40;              // Peripheral function on P1_6

    T3CTL &= ~0x10;             // Stop timer 3 (if it was running)

    T3CTL |= 0x04;              // Clear timer 3

    T3CTL &= ~0x08;             // Disable Timer 3 overflow interrupts

    T3CTL |= 0x03;              // Timer 3 mode = 3 - Up/Down

    T3CCTL0 &= ~0x40;           // Disable channel 0 interrupts

    T3CCTL0 |= 0x04;            // Ch0 mode = compare

    T3CCTL0 |= 0x10;            // Ch0 output compare mode = toggle on compare

}

2. 启动Buzzer

uint8 buzzerStart(uint16 frequency)

{

    uint8 prescaler = 0;

    // Get current Timer tick divisor setting

    uint8 tickSpdDiv = (CLKCONSTA & 0x38)>>3;

    // Check if frequency too low

    if (frequency < (244 >> tickSpdDiv)){   // 244 Hz = 32MHz / 256 (8bit counter) / 4 (up/down counter and toggle on compare) / 128 (max timer prescaler)

        buzzerStop();                       // A lower tick speed will lower this number accordingly.

        return 0;

    }

    // Calculate nr of ticks required to achieve target frequency

    uint32 ticks = (8000000/frequency) >> tickSpdDiv;      // 8000000 = 32M / 4;

    // Fit this into an 8bit counter using the timer prescaler

    while ((ticks & 0xFFFFFF00) != 0)

    {

        ticks >>= 1;

        prescaler += 32;

    }

    // Update registers

    T3CTL &= ~0xE0;

    T3CTL |= prescaler;

    T3CC0 = (uint8)ticks;

    // Start timer

    T3CTL |= 0x10;

    return 1;

}

3. 停止Buzzer

void buzzerStop(void)

{

    T3CTL &= ~0x10;             // Stop timer 3

}

但当我按下触发键启动buzzerStart,还是无法使用蜂鸣器,请问我是有何处忽略了吗?

P.S. 我frequency给2000