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Compute checksum for Redragon K556 packets

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This commit is contained in:
Adam Honse 2020-03-29 02:14:11 -05:00
parent 9f6c3819bd
commit e39617a665
2 changed files with 61 additions and 29 deletions
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85
Controllers/RedragonController/RedragonK556Controller.cpp
View file

@ -43,6 +43,22 @@ void RedragonK556Controller::SetKeyboardColors
| Private packet sending functions. |
\*-------------------------------------------------------------------------------------------------*/
void RedragonK556Controller::ComputeChecksum
(
char usb_buf[64]
)
{
unsigned short checksum = 0;
for(unsigned int byte_idx = 0x03; byte_idx < 64; byte_idx++)
{
checksum += usb_buf[byte_idx];
}
usb_buf[0x01] = checksum & 0xFF;
usb_buf[0x02] = checksum >> 8;
}
void RedragonK556Controller::SendKeyboardBegin()
{
char usb_buf[64];
@ -53,7 +69,9 @@ void RedragonK556Controller::SendKeyboardBegin()
memset(usb_buf, 0x00, sizeof(usb_buf));
/*-----------------------------------------------------*\
| Set up Keyboard Begin packet |
| Set up Keyboard Begin (0x01) packet |
| Note: Not computing checksum as packet contents are |
| fixed |
\*-----------------------------------------------------*/
usb_buf[0x00] = 0x04;
usb_buf[0x01] = 0x01;
@ -67,6 +85,32 @@ void RedragonK556Controller::SendKeyboardBegin()
hid_read(dev, (unsigned char *)usb_buf, 64);
}
void RedragonK556Controller::SendKeyboardEnd()
{
char usb_buf[64];
/*-----------------------------------------------------*\
| Zero out buffer |
\*-----------------------------------------------------*/
memset(usb_buf, 0x00, sizeof(usb_buf));
/*-----------------------------------------------------*\
| Set up Keyboard End (0x02) packet |
| Note: Not computing checksum as packet contents are |
| fixed |
\*-----------------------------------------------------*/
usb_buf[0x00] = 0x04;
usb_buf[0x01] = 0x02;
usb_buf[0x02] = 0x00;
usb_buf[0x03] = 0x02;
/*-----------------------------------------------------*\
| Send packet |
\*-----------------------------------------------------*/
hid_write(dev, (unsigned char *)usb_buf, 64);
hid_read(dev, (unsigned char *)usb_buf, 64);
}
void RedragonK556Controller::SendKeyboardData
(
unsigned char * data,
@ -82,12 +126,11 @@ void RedragonK556Controller::SendKeyboardData
memset(usb_buf, 0x00, sizeof(usb_buf));
/*-----------------------------------------------------*\
| Set up Keyboard End packet |
| Set up Keyboard Color Data (0x11) packet |
\*-----------------------------------------------------*/
usb_buf[0x00] = 0x04;
usb_buf[0x01] = 0x11 + data_offset;
usb_buf[0x02] = data_size;
usb_buf[0x03] = ( data_size / 3 ) - 1;
usb_buf[0x03] = 0x11;
usb_buf[0x04] = data_size;
usb_buf[0x05] = data_offset & 0x00FF;
usb_buf[0x06] = data_offset >> 8;
@ -97,6 +140,11 @@ void RedragonK556Controller::SendKeyboardData
\*-----------------------------------------------------*/
memcpy(&usb_buf[0x08], data, data_size);
/*-----------------------------------------------------*\
| Compute Checksum |
\*-----------------------------------------------------*/
ComputeChecksum(usb_buf);
/*-----------------------------------------------------*\
| Send packet |
\*-----------------------------------------------------*/
@ -117,40 +165,19 @@ void RedragonK556Controller::SendKeyboardMode
memset(usb_buf, 0x00, sizeof(usb_buf));
/*-----------------------------------------------------*\
| Set up Keyboard End packet |
| Set up Keyboard Parameter (0x06) packet |
\*-----------------------------------------------------*/
usb_buf[0x00] = 0x04;
usb_buf[0x01] = 0x00;
usb_buf[0x02] = 0x00;
usb_buf[0x03] = 0x06;
usb_buf[0x04] = 0x01;
usb_buf[0x08] = mode;
/*-----------------------------------------------------*\
| Send packet |
| Compute Checksum |
\*-----------------------------------------------------*/
hid_write(dev, (unsigned char *)usb_buf, 64);
hid_read(dev, (unsigned char *)usb_buf, 64);
}
ComputeChecksum(usb_buf);
void RedragonK556Controller::SendKeyboardEnd()
{
char usb_buf[64];
/*-----------------------------------------------------*\
| Zero out buffer |
\*-----------------------------------------------------*/
memset(usb_buf, 0x00, sizeof(usb_buf));
/*-----------------------------------------------------*\
| Set up Keyboard End packet |
\*-----------------------------------------------------*/
usb_buf[0x00] = 0x04;
usb_buf[0x01] = 0x02;
usb_buf[0x02] = 0x00;
usb_buf[0x03] = 0x02;
/*-----------------------------------------------------*\
| Send packet |
\*-----------------------------------------------------*/

5
Controllers/RedragonController/RedragonK556Controller.h
View file

@ -69,4 +69,9 @@ public:
private:
hid_device* dev;
void ComputeChecksum
(
char usb_buf[64]
);
};