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These registers are 32-bit registers. When accessing them using pointers, when should explicitely divide the fixed offsets GPDIR_REG_OFFSET and GPDAT_REG_OFFSET by 4 to land on the correct address. While set_gpio_bit() did this correctly, clr_gpio_bit() did not. Even though GPDIR_REG_OFFSET = 0x0, shift it as well for consistency with GPDAT_REG_OFFSET. Change-Id: I5b8787d8424f83462ad4bb0f2141370ca28eaf34 Signed-off-by: Antonin Godard <antoningodard@pm.me>