121 lines
3.1 KiB
C
121 lines
3.1 KiB
C
/*
|
|
Cubesat Space Protocol - A small network-layer protocol designed for Cubesats
|
|
Copyright (C) 2012 GomSpace ApS (http://www.gomspace.com)
|
|
Copyright (C) 2012 AAUSAT3 Project (http://aausat3.space.aau.dk)
|
|
|
|
This library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
This library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with this library; if not, write to the Free Software
|
|
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* Common I2C interface,
|
|
* This file is derived from the Gomspace I2C driver,
|
|
*
|
|
*/
|
|
|
|
#ifndef I2C_H_
|
|
#define I2C_H_
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/**
|
|
* The return value of the driver is a bit strange,
|
|
* It should return E_NO_ERR if successfull and the value is -1
|
|
*/
|
|
#define E_NO_ERR -1
|
|
|
|
/**
|
|
* Maximum transfer length on I2C
|
|
*/
|
|
#define I2C_MTU 256
|
|
|
|
/**
|
|
I2C device modes
|
|
@{
|
|
*/
|
|
/**
|
|
I2C Master mode.
|
|
*/
|
|
#define I2C_MASTER 0
|
|
/**
|
|
I2C Slave mode.
|
|
*/
|
|
#define I2C_SLAVE 1
|
|
/**@}*/
|
|
|
|
/**
|
|
Data structure for I2C frames.
|
|
This structs fits on top of #csp_packet_t, removing the need for copying data.
|
|
*/
|
|
typedef struct __attribute__((packed)) i2c_frame_s {
|
|
//! Not used by CSP
|
|
uint8_t padding;
|
|
//! Not used by CSP - cleared before Tx
|
|
uint8_t retries;
|
|
//! Not used by CSP
|
|
uint32_t reserved;
|
|
//! Destination address
|
|
uint8_t dest;
|
|
//! Not used by CSP - cleared before Tx
|
|
uint8_t len_rx;
|
|
//! Length of \a data part
|
|
uint16_t len;
|
|
//! CSP data
|
|
uint8_t data[I2C_MTU];
|
|
} i2c_frame_t;
|
|
|
|
/**
|
|
Callback for receiving data.
|
|
|
|
@param[in] frame received I2C frame
|
|
@param[out] pxTaskWoken can be set, if context switch is required due to received data.
|
|
*/
|
|
typedef void (*i2c_callback_t) (i2c_frame_t * frame, void * pxTaskWoken);
|
|
|
|
/**
|
|
Initialise the I2C driver
|
|
|
|
Functions is called by csp_i2c_init().
|
|
|
|
@param handle Which I2C bus (if more than one exists)
|
|
@param mode I2C device mode. Must be either I2C_MASTER or I2C_SLAVE
|
|
@param addr Own slave address
|
|
@param speed Bus speed in kbps
|
|
@param queue_len_tx Length of transmit queue
|
|
@param queue_len_rx Length of receive queue
|
|
@param callback If this value is set, the driver will call this function instead of using an RX queue
|
|
@return Error code
|
|
*/
|
|
int i2c_init(int handle, int mode, uint8_t addr, uint16_t speed, int queue_len_tx, int queue_len_rx, i2c_callback_t callback);
|
|
|
|
/**
|
|
User I2C transmit function.
|
|
|
|
Called by CSP, when sending message over I2C.
|
|
|
|
@param handle Handle to the device
|
|
@param frame Pointer to I2C frame
|
|
@param timeout Ticks to wait
|
|
@return Error code
|
|
*/
|
|
int i2c_send(int handle, i2c_frame_t * frame, uint16_t timeout);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
#endif
|