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Add gpio_set_af to set alternative function of a pin

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Alexander Heldt
2025-01-01 12:23:18 +01:00
parent 0f279ff9ec
commit 3a69e75d9a
2 changed files with 13 additions and 0 deletions
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12
src/gpio.c
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@@ -10,6 +10,18 @@ void gpio_set_mode(uint16_t pin, GPIO_MODE mode) {
gpio->MODER |= (mode & 0b11) << (pn * 2); // Set new mode. Each pin uses 2 bits gpio->MODER |= (mode & 0b11) << (pn * 2); // Set new mode. Each pin uses 2 bits
} }
void gpio_set_af(uint16_t pin, uint8_t af) {
struct gpio *gpio = GPIO(PINPORT(pin));
int pn = PINNUM(pin);
if (pn < 8) {
gpio->AFRL &= ~(0b1111 << (pn * 4)); // Each pin uses 4 bits
gpio->AFRL |= (af & 0b1111) << (pn * 4);
} else {
gpio->AFRH &= ~(0b1111 << (pn * 4)); // Each pin uses 4 bits
gpio->AFRH |= (af & 0b1111) << (pn * 4);
}
}
void gpio_write(uint16_t pin, bool val) { void gpio_write(uint16_t pin, bool val) {
struct gpio *gpio = GPIO(PINPORT(pin)); struct gpio *gpio = GPIO(PINPORT(pin));
gpio->BSRR = (0b0011 << PINNUM(pin)) << (val ? 0 : 16); gpio->BSRR = (0b0011 << PINNUM(pin)) << (val ? 0 : 16);

1
src/gpio.h
View File

@@ -38,6 +38,7 @@ typedef enum {
} GPIO_MODE; } GPIO_MODE;
void gpio_set_mode(uint16_t pin, GPIO_MODE mode); void gpio_set_mode(uint16_t pin, GPIO_MODE mode);
void gpio_set_af(uint16_t pin, uint8_t af);
void gpio_write(uint16_t pin, bool val); void gpio_write(uint16_t pin, bool val);
#endif #endif