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embassy-rs / stm32-data

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Several chips have a mostly incorrect `__INTERRUPTS` interrupt handler table #373

Closed Ecco closed 9 months ago

Ecco commented 9 months ago

Many newer STM32 use an "interesting" addressing scheme for their interrupt vectors. Namely, the EXTI13 handler's address does not match its position. For example, here's a small extract of the STM32H563's reference manual, page 703 (emphasis mine):

Position Acronym Address
21 EXTI11 0x94
22 EXTI11 0x98
23 EXTI12 0x9C
24 EXTI13 0xE4
25 EXTI14 0xA0
25 EXTI15 0xA4

However, embassy-stm32 will assume that all interrupt handlers' addresses are sequential in the vector table, and generate a vector table accordingly.

As a result, every single interrupt handler after the one for EXTI13 is incorrect (its address is off by one in the table).

This seem to apply to many newer Cortex-M33 based STM32s.

Ecco commented 9 months ago

Turns out… the error is in ST's documentation. Even ST's sample code doesn't match their documentation...