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#include <stdint.h>
#define SPI_GPIO_BANK "gpiochip2"
#define SPI_GPIO_CTS 3
#define SPI_GPIO_RTS 4
#define SPI_MTU 1500
#define SPI_SIZE_BUF (SPI_MTU + 8)
#define SPI_SIZE_HDR 3
#define SPI_SIZE_BUFQ 64
#define SPI_SIZE_MSGQ 256
#define SPI_MTYPE_TUN 1
#define SPI_OK 0
#define SPI_ERR -1
#define SPI_ERR_OPEN -10
#define SPI_ERR_MSG -11
unsigned char *spi_alloc(void);
void spi_free(unsigned char *buffer);
int spi_xchg(unsigned char mtype, unsigned char *buffer, uint16_t len);
int spi_init(char *fname);
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