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У меня есть контроллер STM32F4407VGT6 на плате STM32F4 Discovery. Я пытаюсь читать данные с ADC83 ADC с использованием SPI + DMA, но буфер приема DMA всегда пуст (все нули). В режиме опроса все работает нормально, но я должен прочитать одно 16-разрядное значение образца как 3x 8-битное значение SPI и использовать бит-сдвиги. Возможно, это проблема. Моя частота дискретизации составляет 48 кГц, и в течение каждого периода необходимо считывать три значения spi для получения одного образца АЦП.STM32f4 SPI DMA принимаем
-схема AD7683 синхронизации в datasheet, стр 5.
SPI Comunication на штифтах в порядке. Вот экран от анализатора: pic
Кто-нибудь знает, как это решить или где проблема?
Заранее спасибо.
Вот мой код:
#define DMAbufferSizeRx 3
__IO uint8_t DMAbufferRx[DMAbufferSizeRx];
#define DMAbufferSizeTx 1
__IO uint8_t DMAbufferTx[DMAbufferSizeTx] ;
void DMAconfig(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
/* Enable the DMA Stream IRQ Channel */
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Stream0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
DMA_InitTypeDef DMA_InitStructure;
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable ;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_1QuarterFull ;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single ;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)(&(SPI3->DR));
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
// Configure Tx DMA
DMA_InitStructure.DMA_Channel = DMA_Channel_0;
DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t) &DMAbufferTx[0];
DMA_InitStructure.DMA_BufferSize = DMAbufferSizeTx;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;
DMA_Cmd(DMA1_Stream5, DISABLE);
while (DMA1_Stream5->CR & DMA_SxCR_EN);
DMA_Init(DMA1_Stream5, &DMA_InitStructure);
/* Configure Rx DMA */
DMA_InitStructure.DMA_Channel = DMA_Channel_0;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t) &DMAbufferRx[0];
DMA_InitStructure.DMA_BufferSize = DMAbufferSizeRx;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_Cmd(DMA1_Stream0, DISABLE);
while (DMA1_Stream0->CR & DMA_SxCR_EN);
DMA_Init(DMA1_Stream0, &DMA_InitStructure);
DMA_ITConfig(DMA1_Stream0, DMA_IT_TC , ENABLE); //| DMA_IT_HT
/* Enable the DMA channel */
DMA_ClearFlag(DMA1_Stream0, DMA_FLAG_FEIF0|DMA_FLAG_DMEIF0|DMA_FLAG_TEIF0|DMA_FLAG_HTIF0|DMA_FLAG_TCIF0);
DMA_ClearFlag(DMA1_Stream5, DMA_FLAG_FEIF5|DMA_FLAG_DMEIF5|DMA_FLAG_TEIF5|DMA_FLAG_HTIF5|DMA_FLAG_TCIF5);
DMA_Cmd(DMA1_Stream0, ENABLE); // Enable the DMA SPI TX Stream
DMA_Cmd(DMA1_Stream5, ENABLE); // Enable the DMA SPI RX Stream
// Enable the SPI Rx/Tx DMA request
SPI_I2S_DMACmd(SPI3, SPI_I2S_DMAReq_Rx, ENABLE);
SPI_I2S_DMACmd(SPI3, SPI_I2S_DMAReq_Tx, ENABLE);
SPI_Cmd(SPI3, ENABLE);
}
void DMA1_Stream0_IRQHandler(void)
{
/* Test on DMA Stream Transfer Complete interrupt */
if(DMA_GetITStatus(DMA1_Stream0, DMA_IT_TCIF0))
{
/* Clear DMA Stream Transfer Complete interrupt pending bit */
DMA_ClearITPendingBit(DMA1_Stream0, DMA_IT_TCIF0);
// here is buffer still empty....
}
}
void SPIconfig()
{
SPI_InitTypeDef SPI_InitStructure;
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_DataSize = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft | SPI_NSSInternalSoft_Set;
SPI_InitStructure.SPI_BaudRatePrescaler =SPI_BaudRatePrescaler_16;
SPI_InitStructure.SPI_CRCPolynomial = 0;
SPI_Init(SPI3, &SPI_InitStructure);
SPI_CalculateCRC(SPI3, DISABLE);
SPI_Cmd(SPI3,ENABLE);
}
void RCCenable(void)
{
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOE, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOH, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI3, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
}
void GPIOconfig(void)
{
GPIO_InitTypeDef GPIO_InitDef;
GPIO_InitDef.GPIO_Pin = REG_ON_OFF | ADC_DRIVER_ON_OFF | GPIO_Pin_6;
GPIO_InitDef.GPIO_OType = GPIO_OType_PP;
GPIO_InitDef.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitDef.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitDef.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_Init(GPIOE, &GPIO_InitDef);
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = SDATA | MOSI | SCLK;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource3, GPIO_AF_SPI3);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource4, GPIO_AF_SPI3);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource5, GPIO_AF_SPI3);
GPIO_InitStructure.GPIO_Pin = CS;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOD, &GPIO_InitStructure);
GPIO_SetBits(GPIOD,CS);
}
void TIM2_IRQHandler(void)
{
if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
{
TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
GPIO_ToggleBits(GPIOD,CS);
}
}
void TIM2_Config(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
TIM_TimeBaseStructure.TIM_Period = 875;
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
TIM_Cmd(TIM2, ENABLE);
}