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112 lines
3.0 KiB
C
112 lines
3.0 KiB
C
/**
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******************************************************************************
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*
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* @file pios_i2c_priv.h
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* @author The OpenPilot Team, http://www.openpilot.org Copyright (C) 2010.
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* @brief I2C private definitions.
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* @see The GNU Public License (GPL) Version 3
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*
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*****************************************************************************/
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef PIOS_I2C_PRIV_H
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#define PIOS_I2C_PRIV_H
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#include <pios.h>
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#include <pios_stm32.h>
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#include <stdbool.h>
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struct pios_i2c_adapter_cfg {
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I2C_TypeDef *regs;
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uint32_t remap;
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I2C_InitTypeDef init;
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uint32_t transfer_timeout_ms;
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struct stm32_gpio scl;
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struct stm32_gpio sda;
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struct stm32_irq event;
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struct stm32_irq error;
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};
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enum i2c_adapter_state {
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I2C_STATE_FSM_FAULT = 0, /* Must be zero so undefined transitions land here */
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I2C_STATE_BUS_ERROR,
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I2C_STATE_STOPPED,
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I2C_STATE_STOPPING,
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I2C_STATE_STARTING,
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I2C_STATE_R_MORE_TXN_ADDR,
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I2C_STATE_R_MORE_TXN_PRE_ONE,
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I2C_STATE_R_MORE_TXN_PRE_FIRST,
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I2C_STATE_R_MORE_TXN_PRE_MIDDLE,
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I2C_STATE_R_MORE_TXN_PRE_LAST,
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I2C_STATE_R_MORE_TXN_POST_LAST,
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I2C_STATE_R_LAST_TXN_ADDR,
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I2C_STATE_R_LAST_TXN_PRE_ONE,
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I2C_STATE_R_LAST_TXN_PRE_FIRST,
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I2C_STATE_R_LAST_TXN_PRE_MIDDLE,
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I2C_STATE_R_LAST_TXN_PRE_LAST,
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I2C_STATE_R_LAST_TXN_POST_LAST,
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I2C_STATE_W_MORE_TXN_ADDR,
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I2C_STATE_W_MORE_TXN_MIDDLE,
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I2C_STATE_W_MORE_TXN_LAST,
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I2C_STATE_W_LAST_TXN_ADDR,
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I2C_STATE_W_LAST_TXN_MIDDLE,
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I2C_STATE_W_LAST_TXN_LAST,
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I2C_STATE_NACK,
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I2C_STATE_NUM_STATES /* Must be last */
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};
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enum pios_i2c_adapter_magic {
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PIOS_I2C_DEV_MAGIC = 0xa9a9b8b8,
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};
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struct pios_i2c_adapter {
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enum pios_i2c_adapter_magic magic;
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const struct pios_i2c_adapter_cfg *cfg;
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#ifdef PIOS_INCLUDE_FREERTOS
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xSemaphoreHandle sem_busy;
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xSemaphoreHandle sem_ready;
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#else
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uint8_t busy;
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#endif
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bool bus_error;
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bool nack;
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volatile enum i2c_adapter_state curr_state;
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const struct pios_i2c_txn *first_txn;
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const struct pios_i2c_txn *active_txn;
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const struct pios_i2c_txn *last_txn;
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void (*callback)();
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uint8_t *active_byte;
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uint8_t *last_byte;
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};
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int32_t PIOS_I2C_Init(uint32_t *i2c_id, const struct pios_i2c_adapter_cfg *cfg);
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#endif /* PIOS_I2C_PRIV_H */
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