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LibrePilot/flight/PiOS/inc/pios_i2c_priv.h
Stacey Sheldon ec6d550225 i2c: allow i2c adapters to remap pin functions
Allows us to support more complex pin configurations
for i2c.
2012-01-14 15:38:55 -05:00

108 lines
2.8 KiB
C

/**
******************************************************************************
*
* @file pios_i2c_priv.h
* @author The OpenPilot Team, http://www.openpilot.org Copyright (C) 2010.
* @brief I2C private definitions.
* @see The GNU Public License (GPL) Version 3
*
*****************************************************************************/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef PIOS_I2C_PRIV_H
#define PIOS_I2C_PRIV_H
#include <pios.h>
#include <pios_stm32.h>
#include <stdbool.h>
struct pios_i2c_adapter_cfg {
I2C_TypeDef *regs;
I2C_InitTypeDef init;
uint32_t transfer_timeout_ms;
struct stm32_gpio scl;
struct stm32_gpio sda;
uint32_t remap;
struct stm32_irq event;
struct stm32_irq error;
};
enum i2c_adapter_state {
I2C_STATE_FSM_FAULT = 0, /* Must be zero so undefined transitions land here */
I2C_STATE_BUS_ERROR,
I2C_STATE_STOPPED,
I2C_STATE_STOPPING,
I2C_STATE_STARTING,
I2C_STATE_R_MORE_TXN_ADDR,
I2C_STATE_R_MORE_TXN_PRE_ONE,
I2C_STATE_R_MORE_TXN_PRE_FIRST,
I2C_STATE_R_MORE_TXN_PRE_MIDDLE,
I2C_STATE_R_MORE_TXN_PRE_LAST,
I2C_STATE_R_MORE_TXN_POST_LAST,
I2C_STATE_R_LAST_TXN_ADDR,
I2C_STATE_R_LAST_TXN_PRE_ONE,
I2C_STATE_R_LAST_TXN_PRE_FIRST,
I2C_STATE_R_LAST_TXN_PRE_MIDDLE,
I2C_STATE_R_LAST_TXN_PRE_LAST,
I2C_STATE_R_LAST_TXN_POST_LAST,
I2C_STATE_W_MORE_TXN_ADDR,
I2C_STATE_W_MORE_TXN_MIDDLE,
I2C_STATE_W_MORE_TXN_LAST,
I2C_STATE_W_LAST_TXN_ADDR,
I2C_STATE_W_LAST_TXN_MIDDLE,
I2C_STATE_W_LAST_TXN_LAST,
I2C_STATE_NACK,
I2C_STATE_NUM_STATES /* Must be last */
};
enum pios_i2c_adapter_magic {
PIOS_I2C_DEV_MAGIC = 0xa9a9b8b8,
};
struct pios_i2c_adapter {
enum pios_i2c_adapter_magic magic;
const struct pios_i2c_adapter_cfg * cfg;
void (*callback) (uint8_t, uint8_t);
#ifdef PIOS_INCLUDE_FREERTOS
xSemaphoreHandle sem_busy;
xSemaphoreHandle sem_ready;
#endif
bool bus_error;
volatile enum i2c_adapter_state curr_state;
const struct pios_i2c_txn *first_txn;
const struct pios_i2c_txn *active_txn;
const struct pios_i2c_txn *last_txn;
uint8_t *active_byte;
uint8_t *last_byte;
};
int32_t PIOS_I2C_Init(uint32_t * i2c_id, const struct pios_i2c_adapter_cfg * cfg);
#endif /* PIOS_I2C_PRIV_H */