43 lines
1.3 KiB
C
43 lines
1.3 KiB
C
#ifndef GPIO_H_
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#define GPIO_H_
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#include <stdbool.h>
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#include <inttypes.h>
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struct gpio {
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volatile uint32_t MODER; // Port mode register
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volatile uint32_t OTYPER; // Port output type register
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volatile uint32_t OSPEEDR; // Port output speed register
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volatile uint32_t PUPDR; // Port pull-up/pull-down register
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volatile uint32_t IDR; // Port input data register
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volatile uint32_t ODR; // Port output data register
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volatile uint32_t BSRR; // Port bit set/reset register
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volatile uint32_t LCKR; // Port configuration lock register
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volatile uint32_t AFRL[2]; // Alternative function low register
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volatile uint32_t AFRH[2]; // Alternative function high register
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};
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#define GPIO_BASE_ADDR (0x40020000U)
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#define GPIO_PORT_OFFSET (0x400U)
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#define GPIO(port) ((struct gpio*)(uintptr_t)(GPIO_BASE_ADDR + (GPIO_PORT_OFFSET * port)))
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#define BIT(x) (1 << x)
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// Create a 16bit number from a port and pin
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#define PIN(port, num) ((((port) - 'A') << 8) | num)
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// get the lower byte from a PIN
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#define PINNUM(pin) (pin & 0b1111)
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// get the upper byte from a PIN
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#define PINPORT(pin) (pin >> 8)
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typedef enum {
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GPIO_MODE_INPUT,
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GPIO_MODE_OUTPUT,
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GPIO_MODE_AF,
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GPIO_MODE_ANALOG
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} GPIO_MODE;
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void gpio_set_mode(uint16_t pin, GPIO_MODE mode);
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void gpio_write(uint16_t pin, bool val);
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#endif
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