1911

app/app.c

@@ -23,6 +23,7 @@ int main(void)
 	int fd;
 	int txrx;
 	char buf[1024];
+	char cbuf = '\0';
 		
 	// led_ioctl = makedev(LED_MAJOR_NUMBER, LED_MINOR_NUMBER);
 	// mknod(LED_DEV_PATH_NAME, S_IFCHR|0666, led_dev);
@@ -41,8 +42,8 @@ int main(void)
 	if(txrx == 0){
 		printf("now RPi keep reading..\n");
 		while(1){
-			ioctl(fd, IOCTL_CMD_RECEIVE, &buf);
-			printf("%1023s",buf);
+			ioctl(fd, IOCTL_CMD_RECEIVE, &cbuf);
+			printf("%c",cbuf);
 		}
 	}else if(txrx == 1){
 		printf("now RPi keep writing..\n");

dev/dev.c

@@ -63,7 +63,7 @@ long uart_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 	int i=0;
 	char cbuf[1024];
 	int writelen = 0;
-	char singlechar = '\0';
+	int singlechar = '\0';
 	
 	switch (cmd){
 		case IOCTL_CMD_DIRECTION:
@@ -100,15 +100,8 @@ long uart_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 				rxfe = (*uart_fr>>4); // read RXFE
 			} // now rx is not empty
 			*/
-			i=0;
-			//while(!rxfe){
-				cbuf[i] = (char) (*uart_dr); // read DATA
-				i++;
-				//if(i>1022) break;
-				//rxfe = (*uart_fr>>4); // read RXFE
-			//}
-			cbuf[i]='\n';
-			copy_to_user((const void*)arg, cbuf, 1024);
+			singlechar = (*uart_dr); // read DATA
+			copy_to_user((void*)arg, (const void*)&singlechar, 4);
 			break;
 			
 		case IOCTL_CMD_TRANSMIT:

dev/dev.mod.c

@@ -47,4 +47,4 @@ __attribute__((section(".modinfo"))) =
 "depends=";
 
 
-MODULE_INFO(srcversion, "B707601F40932A4E255B12B");
+MODULE_INFO(srcversion, "81AA5E0020DD316577913D2");