Posted on March 14, 2012 at 16:22I had a strange problem with the Atollic TruStudio Lite toolchain, V2.2. In my project, I had the USART receiving data in the interrupt handler into a buffer, and a main thread evaluating this data, called from main. First, I had defined that buffer as: char buffer[BUFSIZE] = {0}; in main.c, and declared it as: extern char *buffer; in stm32f4xx_it.c. Building the project this way, I received all bytes correctly, but the buffer contained nothing but zeros. If I defined the buffer in the module containing the interrupt routine (stm32f4xx_it.c) and declared it in main.c, the buffer was filled correctly, but landed in the HardFaultHandler when trying to access this buffer. The problem went away when I declared that buffer as: extern char buffer[BUFSIZE]; in stm32f4xx_it.c. Did I miss something ?
