6.2. Layer 1: Port Interface

Functions defined for each supported platform. More...

Files
file	libtropic_port.h
	Header file with layer 1 interfaces which are defined based on host platform.

Macros
#define	LT_DEVICE_PATH_MAX_LEN   256
	Max length of a path to a device in the device tree.

Functions
lt_ret_t	lt_port_init (lt_l2_state_t *s2)
	Platform defined init function. Init resources and set pins as needed.
lt_ret_t	lt_port_deinit (lt_l2_state_t *s2)
	Platform defined deinit function. Deinit resources and clear pins as needed.
lt_ret_t	lt_port_spi_csn_low (lt_l2_state_t *s2)
	Sets chip select pin low, platform defined function.
lt_ret_t	lt_port_spi_csn_high (lt_l2_state_t *s2)
	Sets chip select pin high, platform defined function.
lt_ret_t	lt_port_spi_transfer (lt_l2_state_t *s2, uint8_t offset, uint16_t tx_len, uint32_t timeout_ms)
	Does L1 transfer, platform defined function.
lt_ret_t	lt_port_delay (lt_l2_state_t *s2, uint32_t ms)
	Platform defined function for delay, specifies what host platform should do when libtropic's functions need some delay.
lt_ret_t	lt_port_delay_on_int (lt_l2_state_t *s2, uint32_t ms)
	Platform defined function used to specify reading of an interrupt pin, used as a signal that chip has a response.
lt_ret_t	lt_port_random_bytes (lt_l2_state_t *s2, void *buff, size_t count)
	Fill buffer with random bytes, platform defined function.

Detailed Description

Function used by host platform during l1 operations. Check 'hal/' folder to see what is supported. All of these functions have to be impemented by the port for libtropic to work.