stm32f407的高速并口12位ad——dcmi方式
关于dcmi
我们可以利用这个摄像头接口，进行一个54M以下的并口ad的数据处理。
这个是dcmi的时序图，时钟使用mco1输出系统时钟四分频也就是42m，我的是ad9926，上升沿触发，那么ad数据也就是在下降沿能够稳定下来，那我们的dcmi时钟就配置成下降沿捕获，至于hsync和vsync两个脚就配置硬件同步，都是高电平有效，那么将hsync和vsync拉低就可以开启dcmi了。
部分相关代码
dcmi和dma的配置
void DCMI_GPIO_CONFIG(void)
{GPIO_InitTypeDef GPIO_InitStructure;RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA|RCC_AHB1Periph_GPIOB|RCC_AHB1Periph_GPIOC|RCC_AHB1Periph_GPIOD|RCC_AHB1Periph_GPIOE, ENABLE);//ʹÄÜGPIOA B C E ʱÖÓRCC_AHB2PeriphClockCmd(RCC_AHB2Periph_DCMI,ENABLE);//ʹÄÜDCMIʱÖÓ//PA4/6³õʼ»¯ÉèÖÃGPIO_InitStructure.GPIO_Pin = GPIO_Pin_4|GPIO_Pin_6;//PA4/6 ¸´Óù¦ÄÜÊä³öGPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //¸´Óù¦ÄÜÊä³öGPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//ÍÆÍìÊä³öGPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHzGPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//ÉÏÀGPIO_Init(GPIOA, &GPIO_InitStructure);//³õʼ»¯GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7|GPIO_Pin_6|GPIO_Pin_5;;// PB6/7 ¸´Óù¦ÄÜÊä³öGPIO_Init(GPIOB, &GPIO_InitStructure);//³õʼ»¯GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7|GPIO_Pin_8|GPIO_Pin_9|GPIO_Pin_10|GPIO_Pin_11|GPIO_Pin_12;//PC6/7/8/9/11 ¸´Óù¦ÄÜÊä³öGPIO_Init(GPIOC, &GPIO_InitStructure);//³õʼ»¯ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;//PE5/6 ¸´Óù¦ÄÜÊä³ö GPIO_Init(GPIOD, &GPIO_InitStructure);//³õʼ»¯GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5|GPIO_Pin_6;//PE5/6 ¸´Óù¦ÄÜÊä³ö GPIO_Init(GPIOE, &GPIO_InitStructure);//³õʼ»¯ GPIO_PinAFConfig(GPIOA,GPIO_PinSource4,GPIO_AF_DCMI); //PA4,AF13 DCMI_HSYNCGPIO_PinAFConfig(GPIOA,GPIO_PinSource6,GPIO_AF_DCMI); //PA6,AF13 DCMI_PCLK GPIO_PinAFConfig(GPIOB,GPIO_PinSource7,GPIO_AF_DCMI); //PB7,AF13 DCMI_VSYNC GPIO_PinAFConfig(GPIOC,GPIO_PinSource6,GPIO_AF_DCMI); //PC6,AF13 DCMI_D0 GPIO_PinAFConfig(GPIOC,GPIO_PinSource7,GPIO_AF_DCMI); //PC7,AF13 DCMI_D1 GPIO_PinAFConfig(GPIOC,GPIO_PinSource8,GPIO_AF_DCMI); //PC8,AF13 DCMI_D2GPIO_PinAFConfig(GPIOC,GPIO_PinSource9,GPIO_AF_DCMI); //PC9,AF13 DCMI_D3GPIO_PinAFConfig(GPIOC,GPIO_PinSource11,GPIO_AF_DCMI);//PC11,AF13 DCMI_D4 GPIO_PinAFConfig(GPIOB,GPIO_PinSource6,GPIO_AF_DCMI); //PB6,AF13 DCMI_D5 GPIO_PinAFConfig(GPIOE,GPIO_PinSource5,GPIO_AF_DCMI); //PE5,AF13 DCMI_D6GPIO_PinAFConfig(GPIOE,GPIO_PinSource6,GPIO_AF_DCMI); //PE6,AF13 DCMI_D7GPIO_PinAFConfig(GPIOC,GPIO_PinSource10,GPIO_AF_DCMI); //Pc10,AF13 DCMI_D8GPIO_PinAFConfig(GPIOC,GPIO_PinSource12,GPIO_AF_DCMI); //Pc12,AF13 DCMI_D9GPIO_PinAFConfig(GPIOB,GPIO_PinSource5,GPIO_AF_DCMI); //PB5,AF13 DCMI_D10GPIO_PinAFConfig(GPIOD,GPIO_PinSource2,GPIO_AF_DCMI); //PD2,AF13 DCMI_D11}
void MY_DCMI_Init(void)
{DCMI_InitTypeDef DCMI_InitStructure;DCMI_GPIO_CONFIG(); // D0~D11 GPIO³õʼ»¯ÅäÖÃDCMI_DeInit();//Çå³ýÔÀ´µÄÉèÖà DCMI_InitStructure.DCMI_CaptureMode = DCMI_CaptureMode_Continuous; // Á¬ÐøģʽDCMI_InitStructure.DCMI_CaptureRate = DCMI_CaptureRate_All_Frame; // È«Ö¡²¶»ñDCMI_InitStructure.DCMI_ExtendedDataMode = DCMI_ExtendedDataMode_12b; //12λÊý¾Ý¸ñʽ DCMI_InitStructure.DCMI_HSPolarity = DCMI_HSPolarity_High; //HSYNC µÍµçƽÓÐЧDCMI_InitStructure.DCMI_PCKPolarity = DCMI_PCKPolarity_Falling; //PCLK ϽµÑØÓÐЧDCMI_InitStructure.DCMI_SynchroMode = DCMI_SynchroMode_Hardware; //Ó²¼þͬ²½HSYNC,VSYNCDCMI_InitStructure.DCMI_VSPolarity = DCMI_VSPolarity_High; //VSYNC µÍµçƽÓÐЧDCMI_Init(&DCMI_InitStructure);DCMI_Cmd(ENABLE);
}void DCMI_DMA_Init(void)
{DMA_InitTypeDef DMA_InitStructure;NVIC_InitTypeDef NVIC_InitStructure;RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE); //DMA2ʱÖÓʹÄÜ DMA_DeInit(DMA2_Stream1);while (DMA_GetCmdStatus(DMA2_Stream1) != DISABLE){} //µÈ´ýDMA2_Stream1¿ÉÅäÖà /* ÅäÖà DMA Stream */DMA_InitStructure.DMA_Channel = DMA_Channel_1; //ͨµÀ1 DCMIͨµÀ DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)&DCMI->DR; //ÍâÉèµØַΪ:DCMI->DR (DCMI»ñµÃÊý¾Ý)DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&adc_value; //DMA ´æ´¢Æ÷0µØÖ· (LCDÄ£ÄâSRAM´æ´¢Æ÷)DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory; //ÍâÉèµ½´æ´¢Æ÷ģʽDMA_InitStructure.DMA_BufferSize = length; //Êý¾Ý´«ÊäÁ¿ DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //ÍâÉè·ÇÔöÁ¿Ä£Ê½DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //´æ´¢Æ÷ÔöÁ¿Ä£Ê½DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word; //ÍâÉèÊý¾Ý³¤¶È:32λDMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word; //´æ´¢Æ÷Êý¾Ý³¤¶È 32λDMA_InitStructure.DMA_Mode = DMA_Mode_Circular;// ʹÓÃÑ»·Ä£Ê½ DMA_InitStructure.DMA_Priority = DMA_Priority_High;//¸ßÓÅÏȼ¶DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Enable; //FIFOģʽ DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;//ʹÓÃÈ«FIFO DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;//ÍâÉèÍ»·¢µ¥´Î´«ÊäDMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;//´æ´¢Æ÷Í»·¢µ¥´Î´«ÊäDMA_Init(DMA2_Stream1, &DMA_InitStructure);//³õʼ»¯DMA StreamDMA_ITConfig(DMA2_Stream1, DMA_IT_TC, ENABLE); NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream1_IRQn; //DMA2 ÖжÏNVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x01;NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x02; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure);}void DMA2_Stream1_IRQHandler(void)
{u16 i;DCMI_Stop();if(DMA_GetITStatus(DMA2_Stream1, DMA_IT_TCIF1)) //ÅжÏDMAÖжÏÊÇ·ñÍê³É{//DCMIÍ£Ö¹for(i=0;i<length;i++)//´òÓ¡ADµÄÖµ{printf("%u\r\n",(uint16_t)adc_value[i]);printf("%u\r\n",(uint16_t)(adc_value[i] >> 16));}DMA_ClearITPendingBit(DMA2_Stream1, DMA_IT_TCIF1);//Çå³ýÖжϱêÖ¾delay_ms(1000);DCMI_Start();}}mco以及hsync和vsync的引脚配置
void MY_HV_init(void)
{GPIO_InitTypeDef GPIO_InitStructure;RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);//PAʱÖÓʹÄÜGPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_2;//PA1 PA2GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;GPIO_Init(GPIOA, &GPIO_InitStructure);GPIO_SetBits(GPIOA,GPIO_Pin_1 | GPIO_Pin_2);//PA1 PA2 ÉèÖÃλ¸ßµçƽ
}
void MCO1Init(void)
{GPIO_InitTypeDef GPIO_InitStructure;RCC_AHB1PeriphClockCmd (RCC_AHB1Periph_GPIOA, ENABLE);//ʹÄÜʱÖÓGPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;//PA8 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//¸´ÓÃGPIO_InitStructure.GPIO_OType = GPIO_OType_PP;GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; GPIO_InitStructure.GPIO_Speed = GPIO_High_Speed; GPIO_Init(GPIOA, &GPIO_InitStructure);RCC_MCO1Config(RCC_MCO1Source_PLLCLK, RCC_MCO1Div_4);///PLL 4·ÖƵ
}void nMCO1Init(void)
{GPIO_InitTypeDef GPIO_InitStructure;GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;//PA8 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;//¸´ÓÃGPIO_InitStructure.GPIO_OType = GPIO_OType_PP;GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; GPIO_InitStructure.GPIO_Speed = GPIO_High_Speed; GPIO_Init(GPIOA, &GPIO_InitStructure);GPIO_ResetBits(GPIOA,GPIO_Pin_8);
}
void DCMI_Start(void)
{DCMI_CaptureCmd(ENABLE);//DCMI²¶»ñʹÄÜ MCO1Init();H_V_start;DMA_Cmd(DMA2_Stream1, ENABLE);//¿ªÆôDMA2,Stream1
}void DCMI_Stop(void)
{DCMI_CaptureCmd(DISABLE);//DCMI²¶»ñʹ¹Ø±Õ //while(DCMI->CR&0X01); //µÈ´ý´«Êä½áÊø DMA_Cmd(DMA2_Stream1, DISABLE);//¹Ø±ÕDMA2,Stream1nMCO1Init();H_V_stop;
}main函数
int main(void)
{u16 i;NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//ÉèÖÃϵͳÖжÏÓÅÏȼ¶·Ö×é2delay_init(168);LED_Init();MCO1Init();uart_init(115200);MY_HV_init();DCMI_GPIO_CONFIG();MY_DCMI_Init();DCMI_DMA_Init();DCMI_Start();//delay_ms(200);while(1);
}
//引脚
//pA1--PA4 DCMI_HSYNC
//PA2--PB7 DCMI_VSYNC
//PA8--PA6 DCMI_PCLK+ad clock
//PC6,AF13 DCMI_D0
//PC7,AF13 DCMI_D1
//PC8,AF13 DCMI_D2
//PC9,AF13 DCMI_D3
//PC11,AF13 DCMI_D4
//PB6,AF13 DCMI_D5
//PE5,AF13 DCMI_D6
//PE6,AF13 DCMI_D7
//Pc10,AF13 DCMI_D8
//Pc12,AF13 DCMI_D9
//PB5,AF13 DCMI_D10
//PD2,AF13 DCMI_D11
大概流程就是dcmi的数据通过dma存到一个uint32_t类型大小500的数组，前16位是一个数据后十六位也是一个数据，就一次是1000个数据，触发dma中断（没有使用dcmi中断），中断打印数据。
不喜勿喷！
完整程序在https://download.csdn.net/download/Just_zz/21107388
不过我好像把代码都复制写在上面了，没有积分可以自己建一下工程，就这样。
