finally works!

README.md

@@ -1,3 +1,6 @@
+> [!NOTE]  
+> work in progress, but works!
+
 ## K1NG-Driver
 
 a driver for K1NG PRO (4K) mouse from redragon

main.c

@@ -2,22 +2,23 @@
 #include "src/driver.h"
 
 int main(int argc, char *argv[]) {
-    int level;
+    int sens;
 
     printf("K1NG PRO (4k) driver | Cli\n");
     printf("set any sens from 50-26000\n\n");
+    printf("rememeber to set an value like in original software so for example `50 + 50 = 100` or `100 + 50 = 150` u get the point it goes up by 50\n\n");
 
     if (argc < 2) {
         printf("set sensitivity to: ");
-        if (scanf("%d", &level) != 1) {
+        if (scanf("%d", &sens) != 1) {
             printf("u forgot to input a number?\n");
             return 1;
         }
     } else {
-        level = atoi(argv[1]);
+        sens = atoi(argv[1]);
-        printf("set sensitivity to: %d\n", level);
+        printf("set sensitivity to: %d\n", sens);
     }
 
-    run_driver(level);
+    run_driver(sens);
     return 0;
 }

src/data.c

@@ -1,15 +1,12 @@
-#ifndef DATA_H
+#include "data.h"
-#define DATA_H
+#include <string.h>
+#include <stdlib.h>
 
 struct dpi_payload {
     int level;
     unsigned char buf[17];
 };
 
-/*
- all possible sens values
- reverse engineered from "goldgoldgold.pcapng"
-*/
 static const struct dpi_payload payload_table[] = {
     {50   , {0x08, 0x07, 0x00, 0x00, 0x0c, 0x04, 0x00, 0x00, 0x00, 0x55, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xe1}},
     {100  , {0x08, 0x07, 0x00, 0x00, 0x0c, 0x04, 0x01, 0x01, 0x00, 0x53, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xe1}},
@@ -533,4 +530,26 @@ static const struct dpi_payload payload_table[] = {
     {26000, {0x08, 0x07, 0x00, 0x00, 0x0c, 0x04, 0x07, 0x07, 0x88, 0xbf, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xe1}},
 };
 
-#endif
+static const size_t payload_table_len = sizeof(payload_table) / sizeof(payload_table[0]);
+
+void get_payload(int level, unsigned char *buf) {
+    if (level < payload_table[0].level) {
+        level = payload_table[0].level;
+    } else if (level > payload_table[payload_table_len - 1].level) {
+        level = payload_table[payload_table_len - 1].level;
+    }
+
+    size_t best = 0;
+    int best_diff = abs(level - payload_table[0].level);
+
+    for (size_t i = 1; i < payload_table_len; i++) {
+        int diff = level - payload_table[i].level;
+        if (diff < 0) diff = -diff;
+        if (diff < best_diff) {
+            best_diff = diff;
+            best = i;
+        }
+    }
+
+    memcpy(buf, payload_table[best].buf, sizeof(payload_table[best].buf));
+}

src/driver.c

@@ -2,7 +2,7 @@
 #include "driver.h"
 #include "data.h"
 
-void run_driver(int target_level) {
+void run_driver(int sens) {
     libusb_device_handle *handle = NULL;
     int r = libusb_init(NULL);
     if (r < 0) {
@@ -25,7 +25,7 @@ void run_driver(int target_level) {
     libusb_claim_interface(handle, 1);
 
     unsigned char payload[17];
-    get_payload(target_level, payload);
+    get_payload(sens, payload);
 
     int transferred = libusb_control_transfer(
         handle,
@@ -41,7 +41,7 @@ void run_driver(int target_level) {
     if (transferred < 0) {
         fprintf(stderr, "byte transfer failed: %s\n", libusb_error_name(transferred));
     } else {
-        printf("write succeed %d (%d bytes written)\n", target_level, transferred);
+        printf("write succeed %d (%d bytes written)\n", sens, transferred);
     }
 
     libusb_release_interface(handle, 1);