29 lines
919 B
C
29 lines
919 B
C
#include <inttypes.h>
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#include <stdbool.h>
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#include "gpio.h"
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void gpio_set_mode(uint16_t pin, GPIO_MODE mode) {
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struct gpio *gpio = GPIO(PINPORT(pin)); // GPIO port address
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int pn = PINNUM(pin); // Pin number
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gpio->MODER &= ~(0b11 << (pn * 2)); // Clear existing setting. Each pin uses 2 bits
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gpio->MODER |= (mode & 0b11) << (pn * 2); // Set new mode. Each pin uses 2 bits
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}
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void gpio_set_af(uint16_t pin, uint8_t af) {
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struct gpio *gpio = GPIO(PINPORT(pin));
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int pn = PINNUM(pin);
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if (pn < 8) {
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gpio->AFRL &= ~(0b1111 << (pn * 4)); // Each pin uses 4 bits
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gpio->AFRL |= (af & 0b1111) << (pn * 4);
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} else {
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gpio->AFRH &= ~(0b1111 << (pn * 4)); // Each pin uses 4 bits
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gpio->AFRH |= (af & 0b1111) << (pn * 4);
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}
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}
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void gpio_write(uint16_t pin, bool val) {
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struct gpio *gpio = GPIO(PINPORT(pin));
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gpio->BSRR = (0b0011 << PINNUM(pin)) << (val ? 0 : 16);
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}
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