68 lines
2.0 KiB
C++
68 lines
2.0 KiB
C++
#ifndef __BLUEPILL_GPIO_H__
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#define __BLUEPILL_GPIO_H__
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#include <stdint.h>
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#include "rcc.h"
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constexpr volatile unsigned int *PORTA = reinterpret_cast<volatile unsigned int *>(0x40010800);
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constexpr volatile unsigned int *PORTB = reinterpret_cast<volatile unsigned int *>(0x40010c00);
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constexpr volatile unsigned int *PORTC = reinterpret_cast<volatile unsigned int *>(0x40011000);
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constexpr volatile unsigned int *PORTD = reinterpret_cast<volatile unsigned int *>(0x40011400);
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constexpr volatile unsigned int *PORTE = reinterpret_cast<volatile unsigned int *>(0x40011800);
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class GPIO {
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public:
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void pin_set(uint32_t pin) { this->BSRR |= ((1 << pin) << 16); }
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void pin_clear(uint32_t pin) { this->BSRR |= (1 << pin); }
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void pin_mode(uint32_t pin, bool output, uint32_t mode, uint32_t max) {
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if (output) {
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if (pin > 7) {
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pin = ((pin - 8) * 4);
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this->CRH |= (max << pin);
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this->CRH |= (mode << (pin + 2));
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}
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else {
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pin *= 4;
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this->CRL |= (max << pin);
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this->CRL |= (mode << (pin + 2));
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}
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}
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}
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uint32_t port_index(void) {
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/* Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn. */
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return (((unsigned int)this) - ((unsigned int)PORTA)) >> 10;
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}
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void enable_clock(void) {
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*RCC |= (1 << (this->port_index() + 2));
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}
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private:
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uint32_t CRL; /* configuration register low */
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uint32_t CRH; /* configuration register high */
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uint32_t IDR; /* input data register */
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uint32_t ODR; /* output data register */
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uint32_t BSRR; /* bit set / reset register */
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uint16_t BRR; /* reset register */
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uint32_t LCKR; /* locking register */
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};
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GPIO *GPIO_A = (GPIO *)PORTA;
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GPIO *GPIO_B = (GPIO *)PORTB;
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GPIO *GPIO_C = (GPIO *)PORTC;
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GPIO *GPIO_D = (GPIO *)PORTD;
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GPIO *GPIO_E = (GPIO *)PORTE;
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const uint32_t OUTPUT_MAX_2MHZ = 2;
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const uint32_t OUTPUT_MAX_10MHZ = 1;
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const uint32_t OUTPUT_MAX_50MHZ = 3;
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const uint32_t OUTPUT_GPP = 0;
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const uint32_t OUTPUT_GOD = 1;
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const uint32_t OUTPUT_APP = 2;
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const uint32_t OUTPUT_AOD = 3;
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#endif // __BLUEPILL_GPIO_H__
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