#ifndef __C_API_H__
#define __C_API_H__

#include <stdint.h>

#ifdef __cplusplus
extern "C" {
#endif

/* ========== GPIO C API ========== */
#define GPIO_MODE_INPUT    0
#define GPIO_MODE_OUTPUT   1
#define GPIO_MODE_AF       2
#define GPIO_MODE_ANALOG   3

#define GPIO_PUPD_NONE     0
#define GPIO_PUPD_PULLUP   1
#define GPIO_PUPD_PULLDOWN 2

#define GPIO_PORT_A  0
#define GPIO_PORT_B  1
#define GPIO_PORT_C  2
#define GPIO_PORT_D  3
#define GPIO_PORT_E  4
#define GPIO_PORT_F  5
#define GPIO_PORT_G  6
#define GPIO_PORT_H  7
#define GPIO_PORT_I  8

int gpio_init(uint8_t port, uint32_t pin, uint8_t mode, uint8_t pupd);
int gpio_set(uint8_t port, uint32_t pin);
int gpio_reset(uint8_t port, uint32_t pin);
int gpio_toggle(uint8_t port, uint32_t pin);
uint8_t gpio_read(uint8_t port, uint32_t pin);

/* ========== UART C API ========== */
int uart_init(uint8_t port, uint32_t baudrate);
int uart_send_byte(uint8_t port, uint8_t data);
int uart_send_data(uint8_t port, const uint8_t *data, uint32_t len);
int uart_receive_byte(uint8_t port, uint8_t *data, uint32_t timeout_ms);

/* ========== I2C C API ========== */
int i2c_init(uint8_t port, uint32_t speed_hz);
int i2c_master_write(uint8_t port, uint16_t dev_addr, const uint8_t *data, uint32_t len);
int i2c_master_read(uint8_t port, uint16_t dev_addr, uint8_t *data, uint32_t len);
int i2c_master_write_read(uint8_t port, uint16_t dev_addr, const uint8_t *wdata, uint32_t wlen, uint8_t *rdata, uint32_t rlen);

/* ========== SPI C API ========== */
int spi_bus_init(uint8_t port, uint32_t speed_hz, uint8_t mode);
int spi_transfer(uint8_t port, uint32_t cs_port, uint32_t cs_pin, const uint8_t *tx, uint8_t *rx, uint32_t len);

/* ========== ADC C API ========== */
int adc_init(uint8_t port, uint32_t resolution);
uint16_t adc_read(uint8_t port, uint8_t channel);
float adc_read_voltage(uint8_t port, uint8_t channel);

/* ========== Timer C API ========== */
int timer_bus_init(uint8_t port, uint32_t prescaler, uint32_t period);
int timer_start(uint8_t port);
int timer_stop(uint8_t port);

#ifdef __cplusplus
}
#endif

#endif /* __C_API_H__ */