Overclock STM32G0 64MHz -> 96MHz

General Discussion
1

I’m just showing it is obviously possible, and it seems fun to me.

DISCLAIMER
As with any overclock, boost & etc, if it is not allowed by the manufacturer, you do that at your own risk & etc. Blah.

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image1000×830 155 KB

Patch 
diff --git a/src/stm32/Kconfig b/src/stm32/Kconfig
index b44842049..710ad8a97 100644
--- a/src/stm32/Kconfig
+++ b/src/stm32/Kconfig
@@ -205,7 +205,7 @@ config CLOCK_FREQ
     default 168000000 if MACH_STM32F4x5
     default 180000000 if MACH_STM32F446
     default 216000000 if MACH_STM32F765
-    default 64000000 if MACH_STM32G0
+    default 96000000 if MACH_STM32G0
     default 170000000 if MACH_STM32G431
     default 170000000 if MACH_STM32G474
     default 520000000 if MACH_STM32H723
diff --git a/src/stm32/stm32g0.c b/src/stm32/stm32g0.c
index d02d5728b..c07c59dd6 100644
--- a/src/stm32/stm32g0.c
+++ b/src/stm32/stm32g0.c
@@ -18,7 +18,7 @@
  * Clock setup
  ****************************************************************/
 
-#define FREQ_PERIPH 64000000
+#define FREQ_PERIPH CONFIG_CLOCK_FREQ
 #define FREQ_USB 48000000
 
 // Map a peripheral address to its enable bits

Well, it is an M0+ chip, with what seems to be a pretty simple clock architecture, and this is just a coincidence, that with the current code, it is enough to literally change the clock to the nearest one number (and only one) is 96 MHz, so 192 / 96 = 2, any different would require slightly more changes and it is not really what I’m looking for.

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From the performance perspective, instruction per clock would not change, but the number of instructions per second would. So, overall, timers would be faster.

General step benchmark (arm-none-eabi-gcc (15:14.2.rel1-1) 14.2.1 20241119):

  • 1 stepper - 55 clocks, 1163K → 1745K steps per second.
  • 3 steppers - 239 clocks, 803K → 1205K steps per second.

What places it near the: SAM4S8C with 1690K, 1385K.

That is it on my side.

Thanks!

Ref: Tune TIMER_MIN_TRY_TICKS

Tested on my EBB, it seems to work fine.
So, I hope that if someone needs more performance from Manta E3/M4P/M5P/M8P V1.1, it should deliver it.

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