1 | /** |
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2 | * @file |
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3 | * @ingroup stm32f4_i2c I2C Support |
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4 | * @brief I2C-module. |
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5 | */ |
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6 | |
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7 | /* |
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8 | * Copyright (c) 2013 Christian Mauderer. All rights reserved. |
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9 | * |
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10 | * embedded brains GmbH |
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11 | * Obere Lagerstr. 30 |
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12 | * 82178 Puchheim |
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13 | * Germany |
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14 | * <rtems@embedded-brains.de> |
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15 | * |
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16 | * The license and distribution terms for this file may be |
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17 | * found in the file LICENSE in this distribution or at |
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18 | * http://www.rtems.org/license/LICENSE. |
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19 | */ |
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20 | |
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21 | /* The I2C-module can not run with libi2c. The reason for this is, that libi2c |
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22 | * needs a possibility to generate a stop condition separately. This controller |
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23 | * wants to generate the condition automatically when sending or receiving data. |
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24 | */ |
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25 | |
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26 | #ifndef LIBBSP_ARM_STM32F4_I2C_H |
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27 | #define LIBBSP_ARM_STM32F4_I2C_H |
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28 | |
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29 | #include <rtems.h> |
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30 | |
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31 | #include <bsp/io.h> |
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32 | #include <bsp/stm32f4.h> |
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33 | |
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34 | #ifdef __cplusplus |
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35 | extern "C" { |
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36 | #endif /* __cplusplus */ |
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37 | |
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38 | /** |
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39 | * @defgroup stm32f4_i2c I2C Support |
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40 | * @ingroup arm_stm32f4 |
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41 | * @brief I2C Module |
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42 | * @{ |
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43 | */ |
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44 | |
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45 | typedef struct { |
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46 | /** |
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47 | * @brief The address of the slave without the read write bit. |
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48 | * A 7-Bit address should be placed in the bits [6..0] |
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49 | */ |
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50 | uint16_t addr; |
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51 | /** @brief Read (true) or write (false) data */ |
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52 | bool read; |
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53 | /** @brief Size of data to read or write */ |
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54 | size_t len; |
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55 | /** @brief Buffer for data */ |
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56 | uint8_t *buf; |
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57 | } stm32f4_i2c_message; |
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58 | |
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59 | typedef struct { |
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60 | volatile stm32f4_i2c *regs; |
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61 | size_t index; |
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62 | rtems_vector_number vector; |
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63 | rtems_id mutex; |
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64 | rtems_id task_id; |
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65 | uint8_t *data; |
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66 | uint8_t *last; |
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67 | size_t len; |
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68 | bool read; |
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69 | uint8_t addr_with_rw; |
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70 | } stm32f4_i2c_bus_entry; |
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71 | |
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72 | /** @brief Initialise the i2c module. */ |
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73 | rtems_status_code stm32f4_i2c_init(stm32f4_i2c_bus_entry *e); |
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74 | |
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75 | /** @brief Process a i2c message */ |
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76 | rtems_status_code stm32f4_i2c_process_message( |
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77 | stm32f4_i2c_bus_entry *e, |
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78 | stm32f4_i2c_message *msg |
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79 | ); |
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80 | |
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81 | /** @brief Set another baud rate than the default one */ |
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82 | rtems_status_code stm32f4_i2c_set_bitrate( |
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83 | stm32f4_i2c_bus_entry *e, |
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84 | uint32_t br |
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85 | ); |
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86 | |
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87 | extern stm32f4_i2c_bus_entry *const stm32f4_i2c1; |
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88 | extern stm32f4_i2c_bus_entry *const stm32f4_i2c2; |
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89 | |
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90 | /** @} */ |
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91 | |
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92 | #ifdef __cplusplus |
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93 | } |
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94 | #endif /* __cplusplus */ |
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95 | |
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96 | #endif /* LIBBSP_ARM_STM32F4_I2C_H */ |
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