Posted on May 10, 2012 at 17:07Hi, I am using STM32F105RB and I have a problem with an I2S master receive connection, using SPI2.
I have configured SPI2 in I2S master Receiver mode, and enabled a SPI2 receive interrupt but immediately after SPI2 initialization in I2S mode I am getting Receive interrupt continuously.
SPI2 init. function and I2S2 IRQ handler..
VOID I2S_2_Init( VOID )
{
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
I2S_InitTypeDef I2S_InitStructure;
// Clock configurations
/* SPI3 and SPI2 clocks enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI3 | RCC_APB1Periph_SPI2, ENABLE);
// NVIC Config
/* SPI2 IRQ channel configuration */
NVIC_InitStructure.NVIC_IRQChannel = SPI2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
// GPIO config
/* Configure SPI2 pins: CK, WS and SD ---------------------------------*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_15;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOB, &GPIO_InitStructure);
// I2S config
/* I2S peripheral configuration */
SPI_I2S_DeInit(SPI2);
I2S_InitStructure.I2S_Standard = I2S_Standard_PCMShort;
I2S_InitStructure.I2S_DataFormat = I2S_DataFormat_16b;
I2S_InitStructure.I2S_MCLKOutput = I2S_MCLKOutput_Disable;
I2S_InitStructure.I2S_AudioFreq = I2S_AudioFreq_8k;
I2S_InitStructure.I2S_CPOL = I2S_CPOL_Low;
I2S_InitStructure.I2S_Mode = I2S_Mode_MasterRx; // I2S2 as master RX
I2S_Init(SPI2, &I2S_InitStructure);
/* Enable the I2S2 RxNE interrupt */
SPI_I2S_ITConfig(SPI2, SPI_I2S_IT_RXNE, ENABLE); // RX Int.
/* Enable the I2S2 */
I2S_Cmd(SPI2, ENABLE);
STM_EVAL_LEDToggle(LED1); // NC
}
/* IRQ handlear */
VOID SPI2_IRQHandler ( VOID )
{
STM_EVAL_LEDToggle(LED2); // NC
/* Check the interrupt source */
/* RX */
if (SPI_I2S_GetITStatus(SPI2, SPI_I2S_IT_RXNE) == SET)
{
STM_EVAL_LEDToggle(LED3); // NC
/* Store the I2S2 received data in the relative data table */
usnI2SDatBuf[ucIndex++] = SPI_I2S_ReceiveData(SPI2);
}
}
#i2s-spi-interrupts-interrup
