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Fixes issue with memory alignment in STM32

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When compiling with optimizations on, an issue occurs where the claimed_pins/never_reset_pins memory location is shared with another variable. This causes some bad memory read, so the USB pins ended up being reset. Setting these to have an alignment of 4 bytes resolves this.

Tested on nucleo_f746zg
This commit is contained in:
Mark Olsson 2020-06-17 20:48:04 +02:00
parent 25d5f2cfc6
commit 23da0fa99c
1 changed files with 1 additions and 1 deletions
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ports/stm/common-hal/microcontroller/Pin.c
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@ -55,7 +55,7 @@ bool neopixel_in_use;
STATIC uint16_t claimed_pins[GPIO_PORT_COUNT];
STATIC uint16_t never_reset_pins[GPIO_PORT_COUNT];
STATIC uint16_t __ALIGNED(4) never_reset_pins[GPIO_PORT_COUNT];
void reset_all_pins(void) {
// Reset claimed pins