Test to see if Patriot Viper DRAM modules exist before performing writes

Amended to use read check as quick check doesn't work for SPD addresses by Adam Honse <calcprogrammer1@gmail.com>

Author: TheRogueZeta

Controllers/PatriotViperController/PatriotViperControllerDetect.cpp

@@ -37,32 +37,44 @@ void DetectPatriotViperControllers(std::vector<i2c_smbus_interface*> &busses)
                 // Test for Patriot Viper RGB SPD at slot_addr
                 // This test was copied from Viper RGB software
                 // Tests SPD addresses in order: 0x00, 0x40, 0x41, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68
-                busses[bus]->i2c_smbus_write_byte_data(0x36, 0x00, 0xFF);
+                bool pass = false;
 
-                std::this_thread::sleep_for(1ms);
+                int res = busses[bus]->i2c_smbus_read_byte(slot_addr);
 
-                if(busses[bus]->i2c_smbus_read_byte_data(slot_addr, 0x00) == 0x23)
+                if (res >= 0)
                 {
-                    busses[bus]->i2c_smbus_write_byte_data(0x37, 0x00, 0xFF);
+                    pass = true;
+                }
+
+                if(pass)
+                {
+                    busses[bus]->i2c_smbus_write_byte_data(0x36, 0x00, 0xFF);
 
                     std::this_thread::sleep_for(1ms);
 
-                    if((busses[bus]->i2c_smbus_read_byte_data(slot_addr, 0x40) == 0x85)
-                    &&(busses[bus]->i2c_smbus_read_byte_data(slot_addr, 0x41) == 0x02)
-                    &&(busses[bus]->i2c_smbus_read_byte_data(slot_addr, 0x61) == 0x4D)
-                    &&(busses[bus]->i2c_smbus_read_byte_data(slot_addr, 0x62) == 0x49)
-                    &&(busses[bus]->i2c_smbus_read_byte_data(slot_addr, 0x63) == 0x43)
-                    &&(busses[bus]->i2c_smbus_read_byte_data(slot_addr, 0x64) == 0x53)
-                    &&(busses[bus]->i2c_smbus_read_byte_data(slot_addr, 0x65) == 0x59)
-                    &&(busses[bus]->i2c_smbus_read_byte_data(slot_addr, 0x66) == 0x53)
-                    &&(busses[bus]->i2c_smbus_read_byte_data(slot_addr, 0x67) == 0x5f)
-                    &&(busses[bus]->i2c_smbus_read_byte_data(slot_addr, 0x68) == 0x44))
+                    if(busses[bus]->i2c_smbus_read_byte_data(slot_addr, 0x00) == 0x23)
                     {
-                        slots_valid |= (1 << (slot_addr - 0x50));
+                        busses[bus]->i2c_smbus_write_byte_data(0x37, 0x00, 0xFF);
+
+                        std::this_thread::sleep_for(1ms);
+
+                        if((busses[bus]->i2c_smbus_read_byte_data(slot_addr, 0x40) == 0x85)
+                        &&(busses[bus]->i2c_smbus_read_byte_data(slot_addr, 0x41) == 0x02)
+                        &&(busses[bus]->i2c_smbus_read_byte_data(slot_addr, 0x61) == 0x4D)
+                        &&(busses[bus]->i2c_smbus_read_byte_data(slot_addr, 0x62) == 0x49)
+                        &&(busses[bus]->i2c_smbus_read_byte_data(slot_addr, 0x63) == 0x43)
+                        &&(busses[bus]->i2c_smbus_read_byte_data(slot_addr, 0x64) == 0x53)
+                        &&(busses[bus]->i2c_smbus_read_byte_data(slot_addr, 0x65) == 0x59)
+                        &&(busses[bus]->i2c_smbus_read_byte_data(slot_addr, 0x66) == 0x53)
+                        &&(busses[bus]->i2c_smbus_read_byte_data(slot_addr, 0x67) == 0x5f)
+                        &&(busses[bus]->i2c_smbus_read_byte_data(slot_addr, 0x68) == 0x44))
+                        {
+                            slots_valid |= (1 << (slot_addr - 0x50));
+                        }
                     }
-                }
 
-                std::this_thread::sleep_for(1ms);
+                    std::this_thread::sleep_for(1ms);
+                }
             }
 
             if(slots_valid != 0)