我想将内存的数组用dma方式传送给串口,为什么不能进入中断,望高手指点,程序如下: 还有我想问下dma启动后传完数据后会自动再次不断的重新传输吗,我是菜鸟,不是很明白,谢谢 #include <stdio.h>
#include <stdlib.h>
#include "altera_avalon_pio_regs.h"
#include "altera_avalon_uart_regs.h"
#include "altera_avalon_timer_regs.h"
#include "altera_avalon_dma_regs.h"
#include "system.h"
#include "alt_types.h"
#include "sys/alt_irq.h"
#include "sys/alt_dma.h"
#include "unistd.h"
volatile static alt_u8 chr[20] = {1,2,3,4,6,5,7,8,9,10,11,12,13,14,15,16,17,18,19,20} ;
void init_dma()
{
alt_u16 control_value;
IOWR_ALTERA_AVALON_DMA_CONTROL (DMA_0_BASE, 0);
IOWR_ALTERA_AVALON_DMA_STATUS(DMA_0_BASE, 0); //Clear the status register
IOWR_ALTERA_AVALON_DMA_RADDRESS(DMA_0_BASE, chr); //Write the read dress , for
IOWR_ALTERA_AVALON_DMA_WADDRESS(DMA_0_BASE, (void* )UART_USB_BASE + 1); //Write the write dress , for UART
IOWR_ALTERA_AVALON_DMA_LENGTH(DMA_0_BASE, 10); control_value = ALTERA_AVALON_DMA_CONTROL_BYTE_MSK | ALTERA_AVALON_DMA_CONTROL_GO_MSK |
ALTERA_AVALON_DMA_CONTROL_I_EN_MSK |
ALTERA_AVALON_DMA_CONTROL_WCON_MSK |
ALTERA_AVALON_DMA_CONTROL_LEEN_MSK ;
IOWR_ALTERA_AVALON_DMA_CONTROL(DMA_0_BASE, control_value);
}
void dma_isr(void* context,alt_32 id)
{
printf("ceshi!");
int si=IORD_ALTERA_AVALON_DMA_STATUS (DMA_0_BASE);
if(si&0x1)
{
IOWR_ALTERA_AVALON_DMA_CONTROL (DMA_0_BASE, 0);
IOWR_ALTERA_AVALON_DMA_STATUS (DMA_0_BASE, 0); IOWR_ALTERA_AVALON_DMA_LENGTH (DMA_0_BASE, 10); IOWR_ALTERA_AVALON_DMA_RADDRESS (DMA_0_BASE,chr);
IOWR_ALTERA_AVALON_DMA_WADDRESS (DMA_0_BASE,(void* )UART_USB_BASE + 1); IOWR_ALTERA_AVALON_DMA_CONTROL (DMA_0_BASE,
ALTERA_AVALON_DMA_CONTROL_HW_MSK |
ALTERA_AVALON_DMA_CONTROL_GO_MSK |
ALTERA_AVALON_DMA_CONTROL_I_EN_MSK |
ALTERA_AVALON_DMA_CONTROL_WCON_MSK |
ALTERA_AVALON_DMA_CONTROL_LEEN_MSK);
}
} int main()
{
int s,i;
alt_irq_register(DMA_0_IRQ,0,dma_isr);
init_dma();
while(1)
{
;
}
} | 
