Ael Gain
2009-02-11 18:02:35 UTC
Hi everyone!
I'm new to USB programming and i'm trying to use libhid to communicate with a PIC18F4550.
I wrote these lines of code (almost the same than in test_libhid :) ) in order to send a byte to my PIC but, even if it produces no errors when i run it, it doesn't seems to work... :)
here is the code:
int main(){
int PATH_OUT[2] = { 0xffa00001, 0xffa00004 };
char write_packet[2] = { 31, 54 };
ret = hid_init();
HIDInterfaceMatcher matcher = { 0x1234, 0x0001, NULL, NULL, 0 };
hid = hid_new_HIDInterface();
ret = hid_force_open(hid, 0, &matcher, 3);
ret = hid_set_output_report(hid, PATH_OUT, 2, write_packet, 2);
if (ret != HID_RET_SUCCESS) {
printf( "dead\n");
}else{ printf("good!\n");}
return 0;
}
I'm wondering about my path, so, I paste you the return of lusb -vvv :
Report Descriptor: (length is 47)
Item(Global): Usage Page, data= [ 0xa0 0xff ] 65440
(null)
Item(Local ): Usage, data= [ 0x01 ] 1
(null)
Item(Main ): Collection, data= [ 0x01 ] 1
Application
Item(Local ): Usage, data= [ 0x03 ] 3
(null)
Item(Global): Logical Minimum, data= [ 0x00 ] 0
Item(Global): Logical Maximum, data= [ 0x00 0xff ] 65280
Item(Global): Report Size, data= [ 0x08 ] 8
Item(Global): Report Count, data= [ 0x01 ] 1
Item(Main ): Input, data= [ 0x02 ] 2
Data Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position Non_Volatile Bitfield
Item(Local ): Usage, data= [ 0x04 ] 4
(null)
Item(Global): Logical Minimum, data= [ 0x00 ] 0
Item(Global): Logical Maximum, data= [ 0x00 0xff ] 65280
Item(Global): Report Size, data= [ 0x08 ] 8
Item(Global): Report Count, data= [ 0x01 ] 1
Item(Main ): Output, data= [ 0x02 ] 2
Data Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position Non_Volatile Bitfield
Item(Local ): Usage, data= [ 0x05 ] 5
(null)
Item(Global): Logical Minimum, data= [ 0x00 ] 0
Item(Global): Logical Maximum, data= [ 0x00 0xff ] 65280
Item(Global): Report Size, data= [ 0x08 ] 8
Item(Global): Report Count, data= [ 0x02 ] 2
Item(Main ): Feature, data= [ 0x02 ] 2
Data Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position Non_Volatile Bitfield
Item(Main ): End Collection, data=none
Is my path allright ? Do you see any (many? :-) ) things wrong in my code ? I'm a bit lost in HID programming...
Thank you very much,
cloud
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I'm new to USB programming and i'm trying to use libhid to communicate with a PIC18F4550.
I wrote these lines of code (almost the same than in test_libhid :) ) in order to send a byte to my PIC but, even if it produces no errors when i run it, it doesn't seems to work... :)
here is the code:
int main(){
int PATH_OUT[2] = { 0xffa00001, 0xffa00004 };
char write_packet[2] = { 31, 54 };
ret = hid_init();
HIDInterfaceMatcher matcher = { 0x1234, 0x0001, NULL, NULL, 0 };
hid = hid_new_HIDInterface();
ret = hid_force_open(hid, 0, &matcher, 3);
ret = hid_set_output_report(hid, PATH_OUT, 2, write_packet, 2);
if (ret != HID_RET_SUCCESS) {
printf( "dead\n");
}else{ printf("good!\n");}
return 0;
}
I'm wondering about my path, so, I paste you the return of lusb -vvv :
Report Descriptor: (length is 47)
Item(Global): Usage Page, data= [ 0xa0 0xff ] 65440
(null)
Item(Local ): Usage, data= [ 0x01 ] 1
(null)
Item(Main ): Collection, data= [ 0x01 ] 1
Application
Item(Local ): Usage, data= [ 0x03 ] 3
(null)
Item(Global): Logical Minimum, data= [ 0x00 ] 0
Item(Global): Logical Maximum, data= [ 0x00 0xff ] 65280
Item(Global): Report Size, data= [ 0x08 ] 8
Item(Global): Report Count, data= [ 0x01 ] 1
Item(Main ): Input, data= [ 0x02 ] 2
Data Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position Non_Volatile Bitfield
Item(Local ): Usage, data= [ 0x04 ] 4
(null)
Item(Global): Logical Minimum, data= [ 0x00 ] 0
Item(Global): Logical Maximum, data= [ 0x00 0xff ] 65280
Item(Global): Report Size, data= [ 0x08 ] 8
Item(Global): Report Count, data= [ 0x01 ] 1
Item(Main ): Output, data= [ 0x02 ] 2
Data Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position Non_Volatile Bitfield
Item(Local ): Usage, data= [ 0x05 ] 5
(null)
Item(Global): Logical Minimum, data= [ 0x00 ] 0
Item(Global): Logical Maximum, data= [ 0x00 0xff ] 65280
Item(Global): Report Size, data= [ 0x08 ] 8
Item(Global): Report Count, data= [ 0x02 ] 2
Item(Main ): Feature, data= [ 0x02 ] 2
Data Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position Non_Volatile Bitfield
Item(Main ): End Collection, data=none
Is my path allright ? Do you see any (many? :-) ) things wrong in my code ? I'm a bit lost in HID programming...
Thank you very much,
cloud
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