硬件IIC用DMA传输

2019-07-20 13:44发布

我用的是探索者stm32里DMA例程，ST官方提供IIC读写24CXX程序包，想配置IIC1向24CXX写入数据，现在的现象是IIC写起始信号，地址都正确，开启DMA传数据不成功，下面贴上我的代码，大神能否帮忙指点下？
int main(void)
{
u16 j=0;
u8 i = 0;
u8 readbuf[64];

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);

uart_init(115200);
delay_init();

BSP_LED_Init();  //μ÷êÔμÆ
usmart_dev.init(84);  //μ÷êÔ×é¼t

MYDMA_Config(DMA1_Stream7,DMA_Channel_1,(u32)&I2C1->DR,(u32)SendBuff,SEND_BUF_SIZE);//初始化DMA
Hard_IIC_Init(I2C1, 0xA0, 0);//初始化IIC
printf ("Hard IIC Test. ");

Hard_IIC_WriteNByte(I2C1, 0xA0, 0x00, 5, buf, &i);  //-->OK

}
void MYDMA_Config(DMA_Stream_TypeDef *DMA_Streamx,u32 chx,u32 par,u32 mar,u16 ndtr)
{

DMA_InitTypeDef  DMA_InitStructure;

if((u32)DMA_Streamx>(u32)DMA2)//μÃμ½μ±Ç°streamêÇêôóúDMA2»1êÇDMA1
{
   RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2,ENABLE);//DMA2ê±Öóê1Äü

}else
{
   RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1,ENABLE);//DMA1ê±Öóê1Äü
}
  DMA_DeInit(DMA_Streamx);

while (DMA_GetCmdStatus(DMA_Streamx) != DISABLE){}//μè′yDMA¿éÅäÖÃ

  /* ÅäÖÃ DMA Stream */
  DMA_InitStructure.DMA_Channel = chx;  //í¨μàÑ¡Ôñ
  DMA_InitStructure.DMA_PeripheralBaseAddr = par;//DMAíaéèμØÖ·
  DMA_InitStructure.DMA_Memory0BaseAddr = mar;//DMA ′æ′￠Æ÷0μØÖ·
  DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;//′æ′￠Æ÷μ½íaéèÄ￡ê½
  DMA_InitStructure.DMA_BufferSize = ndtr;//êy¾Y′«êäá¿
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//íaéè·ÇÔöá¿Ä￡ê½
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//′æ′￠Æ÷Ôöá¿Ä￡ê½
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;//íaéèêy¾Y3¤¶è:8Î»
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;//′æ′￠Æ÷êy¾Y3¤¶è:8Î»
  DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;// ê1óÃÆÕí¨Ä￡ê½
  DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;//ÖDμèóÅÏè¼¶
  DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
  DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
  DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;//′æ′￠Æ÷í»·￠μ￥′Î′«êä
  DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;//íaéèí»·￠μ￥′Î′«êä
  DMA_Init(DMA_Streamx, &DMA_InitStructure);//3õê¼»ˉDMA Stream

  /* Enable the DMA Channels Interrupts */
  DMA_ITConfig(DMA1_Stream6, DMA_IT_TC, ENABLE);
// DMA_ITConfig(sEE_I2C_DMA_STREAM_RX, DMA_IT_TC, ENABLE);

}

void Hard_IIC_Init(I2C_TypeDef* IICx, u8 SlaveAdd, u8 F103IIC1_Remap/* Õë¶ÔF103μÄIIC1ÖØó3éäμÄ */)
{
GPIO_InitTypeDef GPIO_InitStructure;
I2C_InitTypeDef I2C_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOB, &GPIO_InitStructure);

//
//1ü½Å¸′óÃ
//
GPIO_PinAFConfig(GPIOB, GPIO_PinSource8, GPIO_AF_I2C1);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource9, GPIO_AF_I2C1);

//
//ÅäÖÃIIC2Îêy
//
I2C_InitStructure.I2C_Mode             = I2C_Mode_I2C;
I2C_InitStructure.I2C_DutyCycle          = I2C_DutyCycle_2;
I2C_InitStructure.I2C_OwnAddress1       = SlaveAdd;  //′óéè±¸μØÖ·
I2C_InitStructure.I2C_Ack                = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_ClockSpeed       = (100 * 1000);  //SCL×î′ó100KHz

I2C_Cmd(IICx, ENABLE);
I2C_Init(IICx, &I2C_InitStructure);

/* Configure and enable I2C DMA TX Channel interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = DMA1_Stream6_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = sEE_I2C_DMA_PREPRIO;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = sEE_I2C_DMA_SUBPRIO;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  /* Configure and enable I2C DMA RX Channel interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = DMA1_Stream5_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = sEE_I2C_DMA_PREPRIO;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = sEE_I2C_DMA_SUBPRIO;
  NVIC_Init(&NVIC_InitStructure);

I2C_AcknowledgeConfig(IICx, ENABLE);

/* Enable the sEE_I2C peripheral DMA requests */
  I2C_DMACmd(IICx, ENABLE);
//
//½ûÖ1ê±ÖóÑó3¤
//
IICx->CR1 |= 1<<7;
}

void Hard_IIC_WriteNByte(I2C_TypeDef * IICx, u8 SlaveAdd, u8 WriteAdd, u32 NumToWrite, u8 * pBuffer, u8 * err)
{
u16 sta = 0;
u16 temp = 0;

while (I2C_GetFlagStatus(IICx, I2C_FLAG_BUSY))  //μè′yIIC
{
temp++;
if (temp > 800)
{
*err |= 1<<0;
I2C_GenerateSTOP(IICx, ENABLE);  //2úéúí￡Ö1DÅoÅ
return;
}
}
I2C_GenerateSTART(IICx, ENABLE);  //2úéúÆeê¼DÅoÅ
temp = 0;
//
//EV5
//
while (!I2C_CheckEvent(IICx, I2C_EVENT_MASTER_MODE_SELECT))
{
temp++;
if (temp > 800)
{
*err |= 1<<1;
I2C_GenerateSTOP(IICx, ENABLE);  //2úéúí￡Ö1DÅoÅ
return;
}
}
I2C_Send7bitAddress(IICx, SlaveAdd, I2C_Direction_Transmitter);  //·￠Ëíéè±¸μØÖ·
temp = 0;
//
//EV6
//
while (!I2C_CheckEvent(IICx, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED))
{
temp++;
if (temp > 1000)
{
*err |= 1<<2;
I2C_GenerateSTOP(IICx, ENABLE);  //2úéúí￡Ö1DÅoÅ
return;
}
}
//
//¶áè¡SR2×′ì¬¼Ä′æÆ÷
//
sta = IICx->SR2;  //èí¼t¶áè¡SR1¼Ä′æÆ÷oó,¶ÔSR2¼Ä′æÆ÷μÄ¶á2ù×÷½«Çå3yADDRÎ»￡¬2»¿ééù￡¡￡¡￡¡￡¡￡¡￡¡￡¡￡¡￡¡
I2C_SendData(IICx, WriteAdd);  //·￠Ëí′æ′￠μØÖ·
temp = 0;
//
//EV8
//
while (!I2C_CheckEvent(IICx, I2C_EVENT_MASTER_BYTE_TRANSMITTING))
{
temp++;
if (temp > 800)
{
*err |= 1<<3;
I2C_GenerateSTOP(IICx, ENABLE);  //2úéúí￡Ö1DÅoÅ
return;
}
}

   /* Configure the DMA Tx Channel with the buffer address and the buffer size */
  sEE_LowLevel_DMAConfig((uint32_t)pBuffer, NumToWrite, sEE_DIRECTION_TX);

  /* Enable the DMA Tx Channel */
  DMA_Cmd(DMA1_Stream6, ENABLE);

}

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