Changes between Version 64 and Version 65 of Developer/Simulators/QEMU/CANEmulation

Timestamp:

09/12/13 12:15:42 (11 years ago)

Author:

Jinyang

Comment:

/* Step 3: Build a Basic PCI-CAN device in qemu */

Developer/Simulators/QEMU/CANEmulation

@@ -412 +412 @@
 ==  Add writing routine  ==
 
-The writing routine is simple. We add the can_chr_write() function as writing routine.
-
+The writing routine is simple. We use the can_chr_write() function as a writing routine, we also should assign this function to CharDriverState.chr_write If we want to call the writing routine in PCI-CAN device, the function qemu_chr_fe_write() should be called instead of calling the can_chr_write() function directly.
+
+The source code is just like the following, details in qemu-char.c file.
+  static int can_chr_write(CharDriverState *chr, const uint8_t *buf, int len)
+  {
+    ......
+  }
+  static CharDriverState *qemu_chr_open_can(QemuOpts *opts)
+  {
+    CharDriverState *chr;
+    ......
+    chr->chr_write = can_chr_write;
+    ......
+  }
+This is same with the ioctl funciton.
+==  Add reading routine  ==