When starting my STM32 makefile project for the first time I encountered a very early hard fault in the startup code. It happened exactly when calling libc function at
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/* Call static constructors */ bl __libc_init_array |
The whole startup code came straight from ST, so I did not suspect it to be faulty. Here is what I have found out to fix the problem.
Continue reading “Hard fault in __libc_init_array”
I have published a basic Makefile project for STM32L151 on Github. I plan to develop it into a low-power wireless sensor network using SP1ML modules. The modules contains STM32L151RB MCU with 128K of flash, SPIRIT1 transceiver chip, antenna and passive components. Basically everything needed to make an 868MHz radio network.
Continue reading “STM32L151 makefile project”
K-Line is another popular OBD2 interfacing standard, that has been used in European cars before CAN bus became common. There are a couple of physical variations (K-line, K+L, KKL) and slightly different protocols (KWP2000 or Keyword Protocol, and ISO 9141) running on those lines. Basically all you need to talk to an older car is an MCU with a UART and a single transistor. 🙂
Continue reading “Reading OBD2 data without ELM327, part 2 – K-Line”