mhsw-espurna/code/espurna/libs/softuart.h

#ifndef SOFTUART_H_
#define SOFTUART_H_

#include "user_interface.h"

#define SOFTUART_MAX_RX_BUFF 64

#define SOFTUART_GPIO_COUNT 16

typedef struct softuart_pin_t {
	uint8_t gpio_id;
	uint32_t gpio_mux_name;
	uint8_t gpio_func;
} softuart_pin_t;

typedef struct softuart_buffer_t {
	char receive_buffer[SOFTUART_MAX_RX_BUFF];
	uint8_t receive_buffer_tail;
	uint8_t receive_buffer_head;
	uint8_t buffer_overflow;
} softuart_buffer_t;

typedef struct {
	softuart_pin_t pin_rx;
	softuart_pin_t pin_tx;
    bool inverse;
	//optional rs485 tx enable pin (high -> tx enabled)
	uint8_t pin_rs485_tx_enable;
	//wether or not this softuart is rs485 and controlls rs485 tx enable pin
	uint8_t is_rs485;
	volatile softuart_buffer_t buffer;
	uint16_t bit_time;
} Softuart;


bool Softuart_Available(Softuart *s);
void Softuart_Intr_Handler(Softuart *s);
void Softuart_SetPinRx(Softuart *s, uint8_t gpio_id);
void Softuart_SetPinTx(Softuart *s, uint8_t gpio_id);
void Softuart_EnableRs485(Softuart *s, uint8_t gpio_id);
void Softuart_Init(Softuart *s, uint32_t baudrate, bool inverse);
void Softuart_Putchar(Softuart *s, char data);
void Softuart_Puts(Softuart *s, const char *c );
uint8_t Softuart_Readline(Softuart *s, char* Buffer, uint8_t MaxLen );
uint8_t Softuart_Read(Softuart *s);

//define mapping from pin to functio mode
typedef struct {
	uint32_t gpio_mux_name;
	uint8_t gpio_func;
} softuart_reg_t;

#endif /* SOFTUART_H_ */