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/**
* @file
* @ingroup stm32f4_i2c I2C Support
* @brief I2C-module.
*/
/*
* Copyright (c) 2013 Christian Mauderer. All rights reserved.
*
* embedded brains GmbH
* Obere Lagerstr. 30
* 82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
/* The I2C-module can not run with libi2c. The reason for this is, that libi2c
* needs a possibility to generate a stop condition separately. This controller
* wants to generate the condition automatically when sending or receiving data.
*/
#ifndef LIBBSP_ARM_STM32F4_I2C_H
#define LIBBSP_ARM_STM32F4_I2C_H
#include <rtems.h>
#include <bsp/io.h>
#include <bsp/stm32f4.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/**
* @defgroup stm32f4_i2c I2C Support
* @ingroup arm_stm32f4
* @brief I2C Module
* @{
*/
typedef struct {
/**
* @brief The address of the slave without the read write bit.
* A 7-Bit address should be placed in the bits [6..0]
*/
uint16_t addr;
/** @brief Read (true) or write (false) data */
bool read;
/** @brief Size of data to read or write */
size_t len;
/** @brief Buffer for data */
uint8_t *buf;
} stm32f4_i2c_message;
typedef struct {
volatile stm32f4_i2c *regs;
size_t index;
rtems_vector_number vector;
rtems_id mutex;
rtems_id task_id;
uint8_t *data;
uint8_t *last;
size_t len;
bool read;
uint8_t addr_with_rw;
} stm32f4_i2c_bus_entry;
/** @brief Initialise the i2c module. */
rtems_status_code stm32f4_i2c_init(stm32f4_i2c_bus_entry *e);
/** @brief Process a i2c message */
rtems_status_code stm32f4_i2c_process_message(
stm32f4_i2c_bus_entry *e,
stm32f4_i2c_message *msg
);
/** @brief Set another baud rate than the default one */
rtems_status_code stm32f4_i2c_set_bitrate(
stm32f4_i2c_bus_entry *e,
uint32_t br
);
extern stm32f4_i2c_bus_entry *const stm32f4_i2c1;
extern stm32f4_i2c_bus_entry *const stm32f4_i2c2;
/** @} */
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* LIBBSP_ARM_STM32F4_I2C_H */
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