1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup mpc55xx_dspi |
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5 | * |
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6 | * @brief Header file for the LibI2C bus driver for the Deserial Serial Peripheral Interface (DSPI). |
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7 | */ |
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8 | |
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9 | /* |
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10 | * Copyright (c) 2008 |
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11 | * Embedded Brains GmbH |
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12 | * Obere Lagerstr. 30 |
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13 | * D-82178 Puchheim |
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14 | * Germany |
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15 | * rtems@embedded-brains.de |
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16 | * |
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17 | * The license and distribution terms for this file may be |
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18 | * found in the file LICENSE in this distribution or at |
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19 | * http://www.rtems.org/license/LICENSE. |
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20 | */ |
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21 | |
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22 | /** |
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23 | * @defgroup mpc55xx_dspi Deserial Serial Peripheral Interface (DSPI) |
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24 | * |
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25 | * @ingroup mpc55xx |
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26 | */ |
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27 | |
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28 | #ifndef LIBCPU_POWERPC_MPC55XX_DSPI_H |
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29 | #define LIBCPU_POWERPC_MPC55XX_DSPI_H |
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30 | |
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31 | #include <rtems/libi2c.h> |
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32 | |
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33 | #include <mpc55xx/edma.h> |
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34 | |
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35 | #ifdef __cplusplus |
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36 | extern "C" { |
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37 | #endif /* __cplusplus */ |
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38 | |
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39 | struct DSPI_tag; |
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40 | |
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41 | typedef struct { |
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42 | edma_channel_context edma; |
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43 | rtems_id id; |
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44 | } mpc55xx_dspi_edma_entry; |
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45 | |
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46 | /** |
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47 | * @brief LibI2C bus driver entry. |
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48 | */ |
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49 | typedef struct { |
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50 | /** |
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51 | * @brief Standard bus driver fields. |
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52 | */ |
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53 | rtems_libi2c_bus_t bus; |
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54 | |
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55 | /** |
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56 | * @brief Index in the bus table: @ref mpc55xx_dspi_bus_table. |
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57 | */ |
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58 | unsigned table_index; |
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59 | |
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60 | /** |
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61 | * @brief Bus number (available after rtems_libi2c_register_bus()). |
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62 | * |
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63 | * @note You must set it in the initialization code after the bus registration. |
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64 | */ |
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65 | unsigned bus_number; |
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66 | |
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67 | /** |
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68 | * @brief Hardware registers. |
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69 | */ |
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70 | volatile struct DSPI_tag *regs; |
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71 | |
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72 | /** |
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73 | * @brief Selects SPI master or slave mode. |
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74 | */ |
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75 | bool master; |
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76 | |
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77 | /** |
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78 | * @brief Data for the Push Register. |
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79 | */ |
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80 | union DSPI_PUSHR_tag push_data; |
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81 | |
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82 | /** |
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83 | * @brief eDMA entry for transmission. |
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84 | * |
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85 | * The channel is fixed to a particular DSPI. |
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86 | */ |
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87 | mpc55xx_dspi_edma_entry edma_transmit; |
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88 | |
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89 | /** |
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90 | * @brief eDMA entry for push data generation. |
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91 | * |
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92 | * You can choose every available channel. |
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93 | */ |
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94 | mpc55xx_dspi_edma_entry edma_push; |
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95 | |
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96 | /** |
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97 | * @brief eDMA entry for receiving. |
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98 | * |
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99 | * The channel is fixed to a particular DSPI. |
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100 | */ |
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101 | mpc55xx_dspi_edma_entry edma_receive; |
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102 | |
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103 | /** |
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104 | * @brief Idle character transmitted in read only mode. |
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105 | */ |
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106 | uint32_t idle_char; |
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107 | |
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108 | /** |
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109 | * @brief Current baud. |
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110 | */ |
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111 | uint32_t baud; |
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112 | } mpc55xx_dspi_bus_entry; |
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113 | |
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114 | /** |
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115 | * @brief Number of DSPIs. |
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116 | */ |
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117 | #define MPC55XX_DSPI_NUMBER 4 |
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118 | |
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119 | /** |
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120 | * @brief Table with bus driver entries. |
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121 | */ |
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122 | extern mpc55xx_dspi_bus_entry mpc55xx_dspi_bus_table [ /* MPC55XX_DSPI_NUMBER */ ]; |
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123 | |
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124 | #ifdef __cplusplus |
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125 | } |
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126 | #endif /* __cplusplus */ |
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127 | |
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128 | #endif /* LIBCPU_POWERPC_MPC55XX_DSPI_H */ |
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