add 2nd motor

Src/stepper.c

@@ -8,7 +8,8 @@
 #include "uart_dmx.h"
 
 stepper_T steppers[] = {
-    {.en_port=GPIOC, .en_pin=11, .dir_port=GPIOB, .dir_pin=4, .step_port=GPIOE, .step_pin=2, .home_port=GPIOF, .home_pin=3}
+    {.en_port=GPIOC, .en_pin=11, .dir_port=GPIOB, .dir_pin=4, .step_port=GPIOE, .step_pin=2, .home_port=GPIOF, .home_pin=3},
+    {.en_port=GPIOB, .en_pin=3, .dir_port=GPIOF, .dir_pin=11, .step_port=GPIOF, .step_pin=12, .home_port=GPIOF, .home_pin=4}
 };
 
 void set_pins(stepper_T* stp){
@@ -127,7 +128,7 @@ void do_steps(){
         if(steppers[i].homed){
             static uint16_t old_ramp_to_speed;
             old_ramp_to_speed = steppers[i].ramp_to_speed;
-            steppers[i].ramp_to_speed = rxBuffer[1] - steppers[i].pos;
+            steppers[i].ramp_to_speed = rxBuffer[i+1] - steppers[i].pos;
 
             if(old_ramp_to_speed == 0 && steppers[i].ramp_to_speed != 0)
                 steppers[i].trigger_step = 1;