# This is a combination of 5 commits.

# This is the 1st commit message:

Choose the timer based on MCU defintion. Timer5 is not valid on C8/CB class boards, so use Timer4 for the step timer.

# This is the commit message #2:

Readme.md update

# This is the commit message #3:

Readme.md update

# This is the commit message #4:

Trying to get readme.md updated

# This is the commit message #5:

readme.md update

Marlin/src/HAL/HAL_STM32F1/HAL_timers_Stm32f1.h

@@ -46,7 +46,12 @@
 typedef uint16_t hal_timer_t;
 #define HAL_TIMER_TYPE_MAX 0xFFFF
 
-#define STEP_TIMER_NUM 4  // index of timer to use for stepper
+#ifdef MCU_STM32F103CB  || defined(MCU_STM32F103C8)
+  #define STEP_TIMER_NUM 4 // For C8/CB boards, use timer 4
+#else
+  #define STEP_TIMER_NUM 5 // for other boards, five is fine.
+#endif
+
 #define STEP_TIMER_CHAN 1 // Channel of the timer to use for compare and interrupts
 #define TEMP_TIMER_NUM 2  // index of timer to use for temperature
 #define TEMP_TIMER_CHAN 1 // Channel of the timer to use for compare and interrupts