最近在ARM11上整一个东西，用串口蓝牙模块，接到主板上，通过向蓝牙发送AT命令，读取反馈信息。
１.暂不带操作系统，我已经加入ramdisk文件系统。
２.在文件系统里运行linux应用程序。
这里是串口操作测试程序，与下列的驱动同步：
#include <stdio.h>
#include <string.h>
#include <fcntl.h> //open(), read(), write()
#define BUFSIZE 100
int main(int argc, char* argv[])
{
int fd, ret;
char buf[BUFSIZE];
char *msg = " ";// "AT\r\n";
fd = open("/dev/s3c2410_serial3", O_RDWR);//s3c2410_serial3
printf("envi serial test program\n");
//printf("fd:%d\n",fd);
if(fd < 0)
{
printf("Error: open /dev/s3c2410_serial3 error!\n");
return 1;
}
ret = write(fd, msg, strlen(msg));
//printf("envi 1\n");
if(ret < 0)
{
printf("Error: write msg error!\n");
return 1;
}
//printf("envi 2\n");
while(1)
{
//printf("while envi \n");
memset(buf, 0, sizeof(buf));
ret = read(fd, buf, BUFSIZE);
//printf("envi 3\n");
if(ret < 0)
{
printf("Error: read device error!\n");
return 1;
}
//printf("envi 4\n");
if(buf[0] != '\0')
{
printf("%s\n", buf);
}
}
return 0;
}
３.我自己也写了个串口驱动。ＵＡＲＴ３口接蓝牙。代码如下：
#if 1
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <asm/uaccess.h> //copy_to_use, copy_from_user
#include <linux/serial_core.h>
#include <plat/regs-serial.h>
#include <asm/io.h> //readl, readb, writel, writeb
#define BUFSIZE 100
#define ttyS3_MAJOR 240
#define ELFIN_UART_BASE 0xEC800000
#define ELFIN_UART3_OFFSET 0x0c00
#define IOBASE (ELFIN_UART_BASE + ELFIN_UART3_OFFSET)
#define UART_ULCON3 IOBASE
#define UART_UCON3 (IOBASE + 0x4)
#define UART_UFCON3 (IOBASE + 0x8)
#define UART_UMCON3 (IOBASE + 0x0C)
#define UART_UTRSTAT3 (IOBASE + 0x10)
#define UART_UFSTAT3 (IOBASE + 0x18)
#define UART_UTXH3 (IOBASE + 0x20)
#define UART_URXH3 (IOBASE + 0x24)
#define UART_UBRDIV3 (IOBASE + 0x28)
#define UART_UDIVSLOT3 (IOBASE + 0x2C)
#define UART_UINTP3 (IOBASE + 0x30)
#define UART_UINTSP3 (IOBASE + 0x34)
#define UART_UINTM3 (IOBASE + 0x38)
#if 0
#define ULCON_OFFSET 0x00
#define UCON_OFFSET 0x04
#define UFCON_OFFSET 0x08
#define UMCON_OFFSET 0x0C
#define UTRSTAT_OFFSET 0x10
#define UERSTAT_OFFSET 0x14
#define UFSTAT_OFFSET 0x18
#define UMSTAT_OFFSET 0x1C
#define UTXH_OFFSET 0x20
#define URXH_OFFSET 0x24
#define UBRDIV_OFFSET 0x28
#define UDIVSLOT_OFFSET 0x2C
#define UINTP_OFFSET 0x30
#define UINTSP_OFFSET 0x34
#define UINTM_OFFSET 0x38
#endif
/*void writel(char value,long reg) {
*(volatile unsigned char *)(reg) = value;
}
char read(long reg) (
return *(volatile unsigned char *)(ELFIN_UART_CONSOLE_BASE3 + UTXH_OFFSET);
}*/
int envi_open(struct inode *inode, struct file *filp)
{
/* 8N1 */
writel(3, UART_ULCON3);
/* poll mode */
writel(0x2c5, UART_UCON3);
writel(0x47, UART_UFCON3);
writel(0x00, UART_UMCON3);
/* 9600 */
writel(0x15b, UART_UBRDIV3);
writel(0x0000, UART_UDIVSLOT3);
return 0;
}
ssize_t envi_write(struct file *filp, const char __user *buf, size_t count, loff_t *f_pos)
{
char wbuf[BUFSIZE]={0};
int state;
int i = 0,temp;
copy_from_user(wbuf, buf, count);
while(wbuf
!= '\0')
{
while(readl(UART_UFSTAT3) & (1<<14));
state = readl(UART_UTRSTAT3);
if((0x02 & state) == 2)
{
writeb(wbuf, UART_UTXH3);
printk("Rx data:%c\n",UART_UTXH3);
i++;
}
}
for(temp = 0; temp < 600000 ; temp++){
if(readl(UART_UFSTAT3) & (1<<14)){
continue;
}
else
break;
if(temp == 600000){
printk("transmit error\n");
}
}
return 0;
}
//EXPORT_SYMBOL_GPL(uart3_write);
ssize_t envi_read(struct file *filp, char __user *buf, size_t count, loff_t *f_ops)
{
/*char rbuf[1] = {0};
int state;
state = readl(UART_UTRSTAT3);
if((0x01 & state) == 1)
{
rbuf[0] = readb(UART_URXH3);
copy_to_user(buf, rbuf, 1);
}
else
{
set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout(10);
}
return 0; */
//envi rewrite
char rbuf[64]={0};
int UFSTAT_REG,i;
char FifoCount, UFSTAT3, RxDataReady,RxChar,UINTPReg,UINTMReg;
UFSTAT_REG = readl(UART_UFSTAT3);
FifoCount = UFSTAT_REG & 0x3f;
UFSTAT3 = (UFSTAT_REG & (1<<6))&0xff;
if(UFSTAT3 || FifoCount > 0)
RxDataReady = 1;
else
RxDataReady = 0;
while(RxDataReady){
RxChar = readb(UART_URXH3);
rbuf = RxChar;
i++;
printk("Rx data:%c\n",RxChar);
UFSTAT_REG = readl(UART_UFSTAT3);
FifoCount = UFSTAT_REG & 0x3f;
UFSTAT3 = UFSTAT_REG & (1<<6);
if(UFSTAT3 || FifoCount > 0)
RxDataReady = 1;
else
RxDataReady = 0;
}
copy_to_user(buf, rbuf, i);
printk("i:%d\n",i);
writel((readl(UART_UINTSP3)|0x01),UART_UINTSP3);
UINTPReg = readb(UART_UINTP3);
UINTMReg = readb(UART_UINTM3);
if((UINTPReg & 0x01)||(UINTPReg & 0x02)){
printk("do not clear int mask\n");
}
else{
UINTMReg |= 0x01;
}
UINTMReg &= ~0x01;
return 0;
}
//EXPORT_SYMBOL_GPL(uart3_read);
int envi_release(struct inode *inode, struct file *filp)
{
return 0;
}
struct file_operations ttyS3_fops =
{
.owner = THIS_MODULE,
.open = envi_open,
.write = envi_write,
.read = envi_read,
.release = envi_release,
};
static __init int envi_init(void){
int rc;
printk("s5p6450 serial module loaded!envi-->\n");
rc = register_chrdev(ttyS3_MAJOR, "s3c2410_serial3", &ttyS3_fops); //s3c2410_serial3
printk("envi --> rc:%d",rc);
if(rc < 0)
{
printk("Error: register s3c2410_serial3 device error!\n") ;
return -1;
}
return 0;
}
static __exit void envi_exit(void){
unregister_chrdev(ttyS3_MAJOR, "s3c2410_serial3");
printk("s5p6450 serial module exit!\n");
return;
}
module_init(envi_init);
module_exit(envi_exit);
MODULE_AUTHOR("envi");
MODULE_DESCRIPTION("s5p6450 serial driver");
MODULE_LICENSE("GPL");
#endif
有问题：
１．我的应用程序在ramdisk文件系统不能正常运行。报语法错误。纠结了很久。运行./app 报出下列信息：
modprobe used greatest stack depth: 5608 bytes left
./app: line 1: ELF: not found
./app: line 2: L: not found
./app: line 1: syntax error: word unexpected (expecting ")")
寻求大家的帮助，谢谢！[ 此帖被envi在2012-07-11 11:23重新编辑 ]
