可能还是哪里有问题；语音输出一直是杂波； 我一共试了三种采样率的WAV文件；
这个代码是11K 8位数据的WA ...
data*2180 这个相乘有没有考虑数据溢出？ adlu 发表于 2017-6-19 08:53
data*2180 这个相乘有没有考虑数据溢出？
额，是有这个可能；这样算 没错 的话，我先转换成浮点数，先做除法，在乘 __interrupt VectorNumber_Vtimch0 void _Sampling_Interrupt(void)
{
// clear interrupt and call oninterrupt function
TC0 = g_iEngineSpeedReal + TCNT;// + rand();
TFLG1 = TFLG1_C0F_MASK;
PWMDTY2 = g_pSound;
g_iSoundIndex++;
if (g_iSoundIndex >= g_iSoundSize)
{
g_iSoundIndex = 0;
}
}
飞思卡尔芯片做过,定时器中断就是采样频率.PWM输出的是音频数据. Johnson Cao 发表于 2017-6-19 09:32
__interrupt VectorNumber_Vtimch0 void _Sampling_Interrupt(void)
{
// clear interrupt a ...
音频数据应该要转换成占空比输出吧； Johnson Cao 发表于 2017-6-19 09:32
__interrupt VectorNumber_Vtimch0 void _Sampling_Interrupt(void)
{
// clear interrupt a ...
这里PWM频率和定时器中断频率一直，在定时器中断中跟新数据，是这样吗 Johnson Cao 发表于 2017-6-19 09:32
__interrupt VectorNumber_Vtimch0 void _Sampling_Interrupt(void)
{
// clear interrupt a ...
我感觉应该他妈的挺简单的，不知道为什么就是搞不出来，
我用的STM32F030C8T6，利用TIM1产生PWM和定时器中断，PWM的频率设置为11KHZ；
TIM1->ARR = 2180;TIM1->PSC = 1 ;
然后定时器中断将WAV的数据转换成TIM1->CCR1的值；
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InirStructure;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; //GPIOA.8
GPIO_InitStructure.GPIO_Mode= GPIO_Mode_AF;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA,&GPIO_InitStructure);
GPIO_PinAFConfig(GPIOA,GPIO_PinSource8,GPIO_AF_2);//GPIO_AF_2
NVIC_InirStructure.NVIC_IRQChannel = TIM1_BRK_UP_TRG_COM_IRQn;
NVIC_InirStructure.NVIC_IRQChannelPriority = 3;
NVIC_InirStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InirStructure);
//wav采样率 24KHz = 48000KHz/(999+1)(1+1);
// 16KHz = 48000KHz/(999+1)(2+1)
// 11KHz= 48000KHz/(2180+1)(1+1)
TIM_TimeBaseInitStructure.TIM_ClockDivision= TIM_CKD_DIV1;
TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
//TIM_TimeBaseInitStructure.TIM_Period = 999;
// TIM_TimeBaseInitStructure.TIM_Prescaler = 2; //16K
TIM_TimeBaseInitStructure.TIM_Period = 2180;
TIM_TimeBaseInitStructure.TIM_Prescaler = 1;//11K
TIM_TimeBaseInit(TIM1,&TIM_TimeBaseInitStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
//TIM_OCInitStructure.TIM_Pulse = 500;//测试
TIM_OC1Init(TIM1,&TIM_OCInitStructure);//TIM1--CH1
TIM_ITConfig(TIM1,TIM_IT_Update,ENABLE);//更新中断
TIM_Cmd(TIM1,ENABLE);
TIM_CtrlPWMOutputs(TIM1,ENABLE);//
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