External clocking STM32F4
Posted: Thu Mar 17, 2016 5:42 pm
Hi,
I'm trying to source my board by a external oscillator. In the beginning I accidentally misconcepted this and put an 0.8Vpp on my board. This did not work because my STM32F429 expects a higher level. So I've patched my board and put a CMOS level VCXO on my board which I still had available. But my board still doesn't boot.
What I have configured (Full source of mcuconf.h)
I can check the activity of my code by a LED which I let blink with a virtual timer continuously in my main routine. The internal clock however works, just not the external clock.
Input clock (Probe directly at OSC_IN pin, OSC_OUT floating)
Regards Sven
I'm trying to source my board by a external oscillator. In the beginning I accidentally misconcepted this and put an 0.8Vpp on my board. This did not work because my STM32F429 expects a higher level. So I've patched my board and put a CMOS level VCXO on my board which I still had available. But my board still doesn't boot.
What I have configured (Full source of mcuconf.h)
Code: Select all
#define STM32_HSE_ENABLED TRUE
#define STM32_LSE_ENABLED FALSE
#define STM32_CLOCK48_REQUIRED FALSE
#define STM32_SW STM32_SW_PLL
#define STM32_PLLSRC STM32_PLLSRC_HSE
#define STM32_PLLM_VALUE 20
#define STM32_PLLN_VALUE 360
#define STM32_PLLP_VALUE 8
#define STM32_PLLQ_VALUE 7
I can check the activity of my code by a LED which I let blink with a virtual timer continuously in my main routine. The internal clock however works, just not the external clock.
Input clock (Probe directly at OSC_IN pin, OSC_OUT floating)
Regards Sven
