Hi all,
We used the sdcc 2.7.0 in our project.
There is one problem when we used the "unsigned short" pointers in
our programs.
If we call the macro defined INW(), the program worked, but when we
called the function defined INW(), the program corrupted.
In addition, the function defined and macro defined INB() both work
normally.
Why does this happen, could anyone explain?
There is the code attached below.
Thanks for your explanation.
/* code is here **************************************************/
/* Table 9-8: device descriptor data structure */
struct usb_device_desc {
uint8_t bLength;
uint8_t bDescriptorType;
uint16_t bcdUSB;
uint8_t bDeviceClass;
#define USB_CLASS_DEVICE_DEFAULT 0x00
#define USB_CLASS_INTERFACE_HID 0x03
#define USB_CLASS_INTERFACE_CCID 0x04
uint8_t bDeviceSubClass;
#define USB_SUBCLASS_DEVICE_DEFAULT 0x00
uint8_t bDeviceProtocol;
#define USB_PROTO_DEVICE_DEFAULT 0x00
uint8_t bMaxPacketSize0;
uint16_t idVendor;
uint16_t idProduct;
uint16_t bcdDevice;
uint8_t iManufacture;
uint8_t iProduct;
uint8_t iSerialNumber;
uint8_t bNumConfigurations;
};
pdata struct usb_device_desc usb_device = {
sizeof (struct usb_device_desc), /* bLength */
USB_DESC_DEVICE, /* bDescriptorType */
USB_VERSION_DEFAULT, /* bcdUSB */
USB_CLASS_DEVICE_DEFAULT, /* bDeviceClass */
USB_SUBCLASS_DEVICE_DEFAULT, /* bDeviceSubClass */
USB_PROTO_DEVICE_DEFAULT, /* bDeviceProtocol */
USB_HW_CTRL_SIZE, /* bMaxPacketSize0 */
USB_VENDOR_ID, /* idVendor */
USB_PRODUCT_ID, /* idProduct */
USB_DEVICE_ID, /* bcdDevice */
USB_STRING_UNSUPPORTED, /* iManufacture */
USB_STRING_UNSUPPORTED, /* iProduct */
USB_STRING_UNSUPPORTED, /* iSerialNumber */
NR_USB_CONFS, /* bNumConfigurations */
};
/* This function corrupt when called the function defined USB_INW()
* But it is worked with the macro defined USB_INW()
*/
static uint16_t usb_test(usb_eid_t eid, uint16_t offset, uint16_t size)
{
uint16_t count = 0;
USB_INB(usb_device.bLength);
USB_INB(usb_device.bDescriptorType);
USB_INW(usb_device.bcdUSB);
USB_INB(usb_device.bDeviceClass);
USB_INB(usb_device.bDeviceSubClass);
USB_INB(usb_device.bDeviceProtocol);
USB_INB(usb_device.bMaxPacketSize0);
USB_INW(usb_device.idVendor);
USB_INW(usb_device.idProduct);
USB_INW(usb_device.bcdDevice);
USB_INB(usb_device.iManufacture);
USB_INB(usb_device.iProduct);
USB_INB(usb_device.iSerialNumber);
USB_INB(usb_device.bNumConfigurations);
return count;
}
/* defined as macro **************************************************/
#define usb_inb(eid, byte, offset, size, count) \
do { \
if (size >= 1 && count == offset) { \
usb_hw_write_byte(eid, byte); \
uart_putc(byte); \
offset += 1; \
size -= 1; \
} \
count += 1; \
} while (0)
#define usb_inw(eid, word, offset, size, count) \
do { \
if (count == offset) \
usb_inb(eid, LOBYTE(word), \
offset, size, count); \
usb_inb(eid, HIBYTE(word), \
offset, size, count); \
} while (0)
#define USB_INB(b) usb_inb(eid, b, offset, size, count)
#define USB_INW(w) usb_inw(eid, w, offset, size, count)
/* defined as function ***********************************************/
void usb_inb(usb_eid_t eid, uint8_t byte,
uint16_t *offset, uint16_t *size, uint16_t *count)
{
if ((*size) >= 1 && (*count) == (*offset)) {
usb_hw_write_byte(eid, byte);
uart_putc(byte);
(*offset)++;
(*size)--;
}
(*count)++;
}
void usb_inw(usb_eid_t eid, uint16_t word,
uint16_t *offset, uint16_t *size, uint16_t *count)
{
if ((*count) == (*offset))
usb_inb(eid, LOBYTE(word), offset, size, count);
usb_inb(eid, HIBYTE(word), offset, size, count);
}
#define USB_INB(b) usb_inb(eid, b, offset, size, count)
#define USB_INW(w) usb_inw(eid, w, offset, size, count)
USB_INW(usb_device.bcdUSB);
Best regards.
Li Xiaojun
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Soliton Network Systems (Shanghai)Co.,Ltd.
TEL:021-63183300-5407
FAX:021-63183300-5555
EMAIL: [email protected]
WEBSITE: http://www.soliton.com.cn
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