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pac55xx: gpio: fix gpio_set_af for pin alternate function settings.

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register bits were not cleared before setting. refactored to be similar
to how the drive strength register is being set.
This commit is contained in:
Kevin Stefanik
2020-02-28 07:40:27 -05:00
committed by Karl Palsson
parent abc74fd78b
commit 89e90e0e5d
2 changed files with 6 additions and 4 deletions
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5
lib/pac55xx/gpio.c
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@@ -110,10 +110,9 @@ void gpio_set_af(uint32_t gpioport, ccs_muxsel_func_t muxsel, uint16_t gpios) {
int ffs = __builtin_ffs(gpios);
while (ffs) {
const int pin = ffs - 1;
const int shift = pin * 4;
reg &= CCS_MUXSELR_MASK << shift;
reg |= muxsel << shift;
reg &= ~CCS_MUXSELR_MASK_PIN(pin);
reg |= CCS_MUXSELR_VAL(pin, muxsel);
/* Set the pinmux configurations for the pull-up / pull-down. */
gpios ^= (1 << pin); /* Clear the bit we just serviced. */