dpram.c

Linux操作系统

/*************************************************************/
/*  dpram  - A program for test DPRAM communication between  */
/*           PowerPC405EP and DSP320VC33 with DualPort RAM   */
/*           This program is meant as an aid only and is     */
/*           not supported by tomxue [e-mail]   */
/*                  Usage:  dpram                            */
/*************************************************************/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <getopt.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/termios.h>
#include <sys/time.h>
#include <string.h>
#include <signal.h>

static struct sigaction	irq1_act;
static struct sigaction irq2_act;
static unsigned long count;
static unsigned char buffer_ready;
static int dpram_fd;
static unsigned char buffer[128*1024];//we use a 128KBytes buffer for dpram opration
/* DPRAM memory table: 						*/
/*	0x0000 - 0x7FFF	PowerPC->DSP data transmit		*/
/*	0x8000 - 0xAFFF	PowerPC<-DSP data receive		*/
/*	0xB000 - 0xFFFF PowerPC<-DSP data receive reserved	*/
//signal process for IRQ1
void irq1_drvSigHandler(int signo)
{                       
        //unsigned char *buffer;
        unsigned char i;
        int     tom, status;
        
        //printf("signal is %d.\n", signo);
        if(46 == signo)         
        {
                //TODO: do something here.
		//read 16KBytes here
		//printf("Read DPRAM 16KBytes.\n");
		status = read(dpram_fd, buffer, (32*1024));	//read data and save in buffer[]
		//for(count=0;count<16;count++)
		//{
		//	printf("0x%02X.\n", buffer[count]);		
		//}		
		buffer_ready = 0;
		//read 16KBytes end
        }
}
//signal process for IRQ2
void irq2_drvSigHandler(int signo)
{
        //unsigned char *buffer;
        unsigned char i;
        int     tom, status;

        printf("signal is %d.\n", signo);
        if(47 == signo)
        {
                //TODO: do something here.
		//read 16KBytes here
		printf("Read DPRAM 16KBytes.\n");
		status = read(dpram_fd, buffer, (16*1024));	//read data and save in buffer[]
		for(count=0;count<16;count++)
		{
			printf("0x%02X.\n", buffer[count]);		
		}		
		buffer_ready = 0;
		//read 16KBytes end
	}
}
void init_dpram_system(void)
{
	int ret;

        buffer_ready = 1;
        //register signal
        printf("register the signal process function.\n");
        //irq1
        irq1_act.sa_handler = irq1_drvSigHandler;
        irq1_act.sa_flags = 0;
        sigemptyset(&irq1_act.sa_mask);
        //irq2
        irq2_act.sa_handler = irq2_drvSigHandler;
        irq2_act.sa_flags = 0;
        sigemptyset(&irq2_act.sa_mask);
        //register
        ret = sigaction(46, &irq1_act, NULL);
        if (ret == -1)
                printf("Request signal 46 failed.\n");
        ret = sigaction(47, &irq2_act, NULL);
        if (ret == -1)
                printf("Request signal 47 failed.\n");
        //open a device
        dpram_fd = open("/dev/dpram",O_SYNC | O_RDWR,0);
        printf("Transmit pid of %d to driver.\n", getpid());
        ret = ioctl(dpram_fd, 0xAA, getpid());
}
unsigned long offset_address;
int main(int argc, char *argv[])
{
	unsigned char i;
	int status, ret;
	char * mychar;
	char my;
	mychar = argv[1];
	my = mychar[0];

	init_dpram_system();
	
	//process
	if(my=='t')
	{
		//printf("Write 32KBytes to DPRAM.\n");
		for(count=0;count<(64*1024);count++)
		{
			//fill data to buffer;
			buffer[count] = count;
		}
		offset_address = 0x00018000;
		lseek(dpram_fd, offset_address, SEEK_SET);
		status = write(dpram_fd, buffer, (64*1024));
		
		printf("Output a low pulse on output1.\n");
		ioctl(dpram_fd, 1, 0);//set output1 high
		ioctl(dpram_fd, 0, 0);//set output1 low
		ioctl(dpram_fd, 1, 0);//set output1 high

                //read 16KBytes here
                printf("Read DPRAM 16KBytes.\n");
                status = read(dpram_fd, buffer, (16*1024));     //read data and save in buffer[]
                for(count=0;count<16;count++)
                {
                        printf("0x%02X.\n", buffer[count]);
                }

	}
	else if(my=='r')
	{
		while(1)
		{
			//printf("Wait for IRQ signal for DSP data ready.\n");
		/*
			read(dpram_fd, buffer, (16*1024));
			for(count=(0);count<((0) + 16);count++)
                	{
                        	printf("0x%02X.\n", buffer[count]);
                	}
		*/
			while(buffer_ready == 1)
			{};

	                //printf("Output a low pulse on output2.\n");
        	        ioctl(dpram_fd, 4, 0);//set output2 high
                	ioctl(dpram_fd, 3, 0);//set output2 low
                	ioctl(dpram_fd, 4, 0);//set output2 high		
			
			buffer_ready = 1;
			
		}
	}	
	else
	{
		printf("Usage: testdpram t for write 32KBytes to   DPRAM.\n");
		printf("       testdpram r for read  16KBytes from DPRAM.\n");
	}
	//close a device
  	close(dpram_fd);  
  	printf("End of test PowerPC DSP data tranceiver function with DPRAM.\n");	  
  	return 0;
}