stm32f103c-blue-pill-overclock.sh

stm32f103c-blue-pill-overclock.sh

#!/bin/bash

# you can use any desired programmer, like JTAG/ST-LINK
# assuming you're using Arduino IDE
# package : https://github.com/stm32duino/BoardManagerFiles/raw/master/STM32/package_stm_index.json
# the default library already should be at max stock clock (72MHz <=> RCC PLL multiplier of 9 for HSE crystal of 8MHz)
LIBVERSION=1.9.0
ARDVERSION=15
HOME=$HOME
BOARD=PILL_F103XX
CONF="$HOME/.arduino$ARDVERSION/packages/STM32/hardware/stm32/$LIBVERSION/variants/$BOARD/variant.cpp"
# please change versions and home to adapt to your configuration

CURRENT=$(grep RCC_PLL_MUL "$CONF" | cut -d ' ' -f 5 | cut -d ';' -f 1)
FREQ=$(echo "$CURRENT" | cut -d 'L' -f 4)
let FREQ*=8
echo "CURRENT FREQUENCY $FREQ MHz"
echo "SELECT DESIRED FREQUENCY :"
# original stm led works up to 80MHz, clones up to 104MHz
# max crystal swap frequency for original is 24MHz (although the claimed limit is 16MHz)
# screen capability is lost for original if more than 72Mhz, but clone can go up to 128MHz
# USB should keep up, but may fail for some reasons
# UART should be stable in all cases, as well as the rest of the code (float, strings, etc)
select f in 16 24 32 40 48 56 64 72 80 88 96 104 112 120 128
do
	if [[ "$f" ]]
	then
		let MUL=REPLY+1
		NEW="RCC_PLL_MUL$MUL"
		sed -i s/$CURRENT/$NEW/g $CONF
		let FREQ=MUL*8
		echo "FREQUENCY SET TO $FREQ MHz"
		if [[ $MUL -ge 11 ]]
		then
			echo "! WARNING ! USB and LED might fail at such frequency"
		fi
		break
	fi
	echo "PLEASE SELECT A NUMBER"
done
# external underclock is possible
# external overclock isn't stable if more than 10MHz (equivalent to 90MHz on board)
# frequency can even be changed without reprogramming and turning off the STM...
# note that from now you can compile and upload your Arduino IDE code to your STM, the thicker/time/sleep will adapt to the frequency, so you won't hav
e to recompensate the overclock by additional timing
# more frequency also means more power consumption and higher temperature