void ov7725_eagle_vsync(void)
{
//uart_putchar (UART0, 0);
//场中断需要判断是场结束还是场开始
if(ov7725_eagle_img_flag == IMG_START) //需要开始采集图像
{
if(PORTD_ISFR & 0x2000) //PTD13触发中断，采集的行中断
{
PORTD_ISFR |= 0x2000; //写1清中断标志位
if(Sample_Flag==0)
{
return;
}
if((LinCout%(480/DATALINE)==0)&&(LinADCout<DATALINE))
{
//uart_putchar (UART0, 1);
systick_delay_us(8);
DMA_DADDR(DMA_CH4) = (uint32_t)ov7725_eagle_img_buff[LinADCout] ; //数据存储地址变化
DMA_EN(DMA_CH4); //使能通道CHn 硬件请求 (这样才能继续触发DMA传输)
DMA_IRQ_EN(DMA_CH4) ; //允许DMA通道传输
LinADCout ++ ;
}
LinCout++;
if(LinADCout==DATALINE)
{
LinADCout=0;
ov7725_eagle_img_flag = IMG_FINISH;
Sample_Flag=0;
disable_irq(PORTD_IRQn); //关闭PTd的中断
}
}
if(PORTD_ISFR & 0x4000) //PTD14触发中断,采集的场中断。
{
PORTD_ISFR |= 0x4000; //写1清中断标志
//uart_putchar (UART0, 2);
LinCout = 0 ;
LinADCout=0;
Sample_Flag=1;
port_init(PTD13, ALT1 | IRQ_FALLING | PULLUP ); //初始化 PTD7 管脚，复用功能为GPIO ，下降沿触发中断，上拉电阻
PORTD_ISFR |= 0x2000; //写1清中断标志位
}
}
}
/*!
* @brief 鹰眼ov7725场中断服务函数
* @since v5.0
*/
void ov7725_eagle_vsync(void)
{
//场中断需要判断是场结束还是场开始
if(ov7725_eagle_img_flag == IMG_START) //需要开始采集图像
{
ov7725_eagle_img_flag = IMG_GATHER; //标记图像采集中
disable_irq(PORTC_IRQn);
DMA_EN(CAMERA_DMA_CH); //使能通道CHn 硬件请求
DMA_DADDR(CAMERA_DMA_CH) = (uint32)ov7725_eagle_img_buff; //恢复地址
}
else //图像采集错误
{
disable_irq(PORTC_IRQn); //关闭PTA的中断
ov7725_eagle_img_flag = IMG_FAIL; //标记图像采集失败
}
}
void DmaChannelInit(int channel, void *source_ptr, void *dest_ptr, int size, int source,
int source_inc, int dest_inc) {
// Configure mux.
// Disable channel and clear everything.
DMAMUX_CHCFG(channel) = 0x00;
// Select source.
DMAMUX_CHCFG(channel) |= DMAMUX_CHCFG_SOURCE(source);
// Configure channel.
// Set up source and dest addresses.
DMA_SADDR(channel) = (int)source_ptr;
DMA_DADDR(channel) = (int)dest_ptr;
// Set soruce and dest address increment.
DMA_SOFF(channel) = source_inc;
DMA_DOFF(channel) = dest_inc;
// Set size of transfer 0x00 = 1 byte.
DMA_ATTR(channel) = DMA_ATTR_SSIZE(0) | DMA_ATTR_DSIZE(0);
// Set bytes per minor loop.
DMA_NBYTES_MLNO(channel) = 0x01;
// Set number of minor loops.
DMA_CITER_ELINKNO(channel) = DMA_CITER_ELINKNO_CITER(size);
DMA_BITER_ELINKNO(channel) = DMA_BITER_ELINKNO_BITER(size);
// Adjustment applied after major loop finishes
DMA_SLAST(channel) = -(size * source_inc); // Source address adjustment.
DMA_DLAST_SGA(channel) = -(size * dest_inc); // Destination address adjustment.
// Set to disable on completion.
DMA_CSR(0) |= DMA_CSR_DREQ_MASK;
// Enable DMA request for channel.
DMA_ERQ |= (1 << channel);
// Enable mux.
DMAMUX_CHCFG(channel) |= DMAMUX_CHCFG_ENBL_MASK;
}
void
PORTA_ISR(void) //场中断处理函数
{
if(PORTA_ISFR & (1 << 29)) //PTA29触发中断
{
switch(img_flag)
{
case IMG_START:
img_flag = IMG_GATHER; //标记图像采集中
DMA_EN(CAMERA_DMA_CH); //使能通道CHn 硬件请求
DMA_DADDR(CAMERA_DMA_CH) = (uint32)IMG_BUFF; //恢复地址
break;
default :
break;
}
}
if (PORTA_ISFR & (1 << 10)) // TAGS: 编码器引脚PTA10中断
{
encoder_cnt ++;
}
PORTA_ISFR = ~0; //场中断里，全部都要清中断标志位
}
