forked from Imagelibrary/rtems
97 lines
2.1 KiB
C
97 lines
2.1 KiB
C
/**
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* @file
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* @ingroup stm32f4_i2c I2C Support
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* @brief I2C-module.
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*/
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/*
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* Copyright (c) 2013 Christian Mauderer. All rights reserved.
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*
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* embedded brains GmbH
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* Obere Lagerstr. 30
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* 82178 Puchheim
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* Germany
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* <rtems@embedded-brains.de>
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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/* The I2C-module can not run with libi2c. The reason for this is, that libi2c
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* needs a possibility to generate a stop condition separately. This controller
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* wants to generate the condition automatically when sending or receiving data.
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*/
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#ifndef LIBBSP_ARM_STM32F4_I2C_H
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#define LIBBSP_ARM_STM32F4_I2C_H
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#include <rtems.h>
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#include <bsp/io.h>
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#include <bsp/stm32f4.h>
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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/**
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* @defgroup stm32f4_i2c I2C Support
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* @ingroup RTEMSBSPsARMSTM32F4
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* @brief I2C Module
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* @{
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*/
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typedef struct {
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/**
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* @brief The address of the slave without the read write bit.
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* A 7-Bit address should be placed in the bits [6..0]
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*/
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uint16_t addr;
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/** @brief Read (true) or write (false) data */
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bool read;
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/** @brief Size of data to read or write */
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size_t len;
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/** @brief Buffer for data */
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uint8_t *buf;
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} stm32f4_i2c_message;
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typedef struct {
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volatile stm32f4_i2c *regs;
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size_t index;
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rtems_vector_number vector;
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rtems_id mutex;
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rtems_id task_id;
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uint8_t *data;
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uint8_t *last;
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size_t len;
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bool read;
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uint8_t addr_with_rw;
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} stm32f4_i2c_bus_entry;
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/** @brief Initialise the i2c module. */
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rtems_status_code stm32f4_i2c_init(stm32f4_i2c_bus_entry *e);
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/** @brief Process a i2c message */
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rtems_status_code stm32f4_i2c_process_message(
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stm32f4_i2c_bus_entry *e,
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stm32f4_i2c_message *msg
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);
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/** @brief Set another baud rate than the default one */
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rtems_status_code stm32f4_i2c_set_bitrate(
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stm32f4_i2c_bus_entry *e,
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uint32_t br
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);
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extern stm32f4_i2c_bus_entry *const stm32f4_i2c1;
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extern stm32f4_i2c_bus_entry *const stm32f4_i2c2;
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/** @} */
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* LIBBSP_ARM_STM32F4_I2C_H */
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