/*******************************************************************************
* Function Name : Speaker_Timer_Config
* Description : Configure and enable the timer
* Input : None.
* Return : None.
*******************************************************************************/
void Speaker_Config(void)
{
#ifdef USE_STM3210B_EVAL
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
/* Configure PB.08 as alternate function (TIM4_OC3) */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/* TIM4 configuration */
TIM_TimeBaseStructure.TIM_Prescaler = 0x00; /* TIM4CLK = 72 MHz */
TIM_TimeBaseStructure.TIM_Period = 0xFF; /* PWM frequency : 281.250KHz*/
TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
/* TIM4's Channel3 in PWM1 mode */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_Pulse = 0x7F; /* Duty cycle: 50%*/
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; /* set high polarity */
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OC3Init(TIM4, &TIM_OCInitStructure);
TIM_OC3PreloadConfig(TIM4, TIM_OCPreload_Enable);
/* TIM2 configuration */
TIM_TimeBaseStructure.TIM_Period = TIM2ARRValue;
TIM_TimeBaseStructure.TIM_Prescaler = 0x00; /* TIM2CLK = 72 MHz */
TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
/* Output Compare Inactive Mode configuration: Channel1 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Timing;
TIM_OCInitStructure.TIM_Pulse = 0x0;
TIM_OC1Init(TIM2, &TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Disable);
/* Start TIM4 */
TIM_Cmd(TIM4, ENABLE);
/* Start TIM2 */
TIM_Cmd(TIM2, ENABLE);
/* Enable TIM2 update interrupt */
TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
#else
/* Configure the initializatin parameters */
I2S_GPIO_Config();
I2S_Config(I2S_Standard_Phillips, I2S_MCLKOutput_Enable, I2S_AudioFreq_22k);
CODEC_Config(OutputDevice_SPEAKER, I2S_Standard_Phillips, I2S_MCLKOutput_Enable, 0x08);
SPI_I2S_ITConfig(SPI2, SPI_I2S_IT_TXE, ENABLE);
#endif
}
/**
* @brief I2S_Bus_Init 初始化iis总线
* @param none
* @retval none
*/
void I2S_Bus_Init(void)
{
/* 配置I2S GPIO用到的引脚 */
I2S_GPIO_Config();
/* 配置I2S工作模式 */
I2S_Mode_Config();
I2S_Cmd(SPI2, DISABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
}
/*******************************************************************************
* Function Name : I2S_CODEC_Init
* Description : Initializes the I2S audio codec according parameters configured
* by I2S_CODEC_Config function.
* Input : - OutputDevice: Could be OutoutDevice_SPEAKER or
* OutoutDevice_HEADPHONE.
* - Address: Specifies the location of the audio file in the memory.
* Output : None
* Return : - 0: if all initializations are OK.
* - 1: if memory initialization failed (LD2 is turned on).
* - 2: if audio file initialization failed (LD2 is turned on).
* - 3: if Codec initialization failed (LD1 is turned on).
*******************************************************************************/
uint32_t I2S_CODEC_Init(uint32_t OutputDevice, uint32_t Address)
{
uint32_t count = 0;
/* Set the audio file address */
AudioFileAddress = (uint32_t) Address;
/* Configure the I2S2, I2C1 and GPIOF pins */
I2S_GPIO_Config();
/* Read the Audio file to extract the audio data length and frequency */
errorcode = AudioFile_Init();
if (errorcode < 3)
{
/* Turn on LD2 connected to PF.07 */
return errorcode;
}
/* Configure the SPI2 peripheral in I2S mode */
I2S_Config(I2S_STANDARD, I2S_MCLKOUTPUT, i2saudiofreq);
printf("\n\r i2saudiofreq: 0x%dHz ", i2saudiofreq);
/* Set the current output device */
CurrentOutputDevice = OutputDevice;
/* Codec Configuration via I2C interface */
count = CODEC_Config(OutputDevice, I2S_Standard_MSB, I2S_MCLKOUTPUT, DEFAULT_VOL);
if (count != 0)
{
/* Turn on LD1 connected to PF.06 */
return 3;
}
/* Turn on LD4 connected to PF.09 */
return 0; /* Configuration is OK */
}