1 |
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2 | /** \addtogroup hal */
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3 | /** @{*/
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4 | /* mbed Microcontroller Library
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5 | * Copyright (c) 2006-2013 ARM Limited
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6 | *
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7 | * Licensed under the Apache License, Version 2.0 (the "License");
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8 | * you may not use this file except in compliance with the License.
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9 | * You may obtain a copy of the License at
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10 | *
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11 | * http://www.apache.org/licenses/LICENSE-2.0
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12 | *
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13 | * Unless required by applicable law or agreed to in writing, software
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14 | * distributed under the License is distributed on an "AS IS" BASIS,
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15 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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16 | * See the License for the specific language governing permissions and
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17 | * limitations under the License.
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18 | */
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19 | #ifndef MBED_SERIAL_API_H
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20 | #define MBED_SERIAL_API_H
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21 |
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22 | #include "device.h"
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23 | #include "hal/buffer.h"
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24 | #include "hal/dma_api.h"
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25 |
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26 | #if DEVICE_SERIAL
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27 |
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28 | #define SERIAL_EVENT_TX_SHIFT (2)
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29 | #define SERIAL_EVENT_RX_SHIFT (8)
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30 |
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31 | #define SERIAL_EVENT_TX_MASK (0x00FC)
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32 | #define SERIAL_EVENT_RX_MASK (0x3F00)
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33 |
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34 | #define SERIAL_EVENT_ERROR (1 << 1)
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35 |
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36 | /**
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37 | * @defgroup SerialTXEvents Serial TX Events Macros
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38 | *
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39 | * @{
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40 | */
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41 | #define SERIAL_EVENT_TX_COMPLETE (1 << (SERIAL_EVENT_TX_SHIFT + 0))
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42 | #define SERIAL_EVENT_TX_ALL (SERIAL_EVENT_TX_COMPLETE)
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43 | /**@}*/
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44 |
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45 | /**
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46 | * @defgroup SerialRXEvents Serial RX Events Macros
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47 | *
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48 | * @{
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49 | */
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50 | #define SERIAL_EVENT_RX_COMPLETE (1 << (SERIAL_EVENT_RX_SHIFT + 0))
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51 | #define SERIAL_EVENT_RX_OVERRUN_ERROR (1 << (SERIAL_EVENT_RX_SHIFT + 1))
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52 | #define SERIAL_EVENT_RX_FRAMING_ERROR (1 << (SERIAL_EVENT_RX_SHIFT + 2))
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53 | #define SERIAL_EVENT_RX_PARITY_ERROR (1 << (SERIAL_EVENT_RX_SHIFT + 3))
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54 | #define SERIAL_EVENT_RX_OVERFLOW (1 << (SERIAL_EVENT_RX_SHIFT + 4))
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55 | #define SERIAL_EVENT_RX_CHARACTER_MATCH (1 << (SERIAL_EVENT_RX_SHIFT + 5))
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56 | #define SERIAL_EVENT_RX_ALL (SERIAL_EVENT_RX_OVERFLOW | SERIAL_EVENT_RX_PARITY_ERROR | \
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57 | SERIAL_EVENT_RX_FRAMING_ERROR | SERIAL_EVENT_RX_OVERRUN_ERROR | \
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58 | SERIAL_EVENT_RX_COMPLETE | SERIAL_EVENT_RX_CHARACTER_MATCH)
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59 | /**@}*/
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60 |
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61 | #define SERIAL_RESERVED_CHAR_MATCH (255)
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62 |
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63 | typedef enum {
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64 | ParityNone = 0,
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65 | ParityOdd = 1,
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66 | ParityEven = 2,
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67 | ParityForced1 = 3,
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68 | ParityForced0 = 4
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69 | } SerialParity;
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70 |
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71 | typedef enum {
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72 | RxIrq,
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73 | TxIrq
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74 | } SerialIrq;
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75 |
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76 | typedef enum {
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77 | FlowControlNone,
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78 | FlowControlRTS,
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79 | FlowControlCTS,
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80 | FlowControlRTSCTS
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81 | } FlowControl;
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82 |
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83 | typedef void (*uart_irq_handler)(uint32_t id, SerialIrq event);
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84 |
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85 | #if DEVICE_SERIAL_ASYNCH
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86 | /** Asynch serial HAL structure
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87 | */
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88 | typedef struct {
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89 | struct serial_s serial; /**< Target specific serial structure */
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90 | struct buffer_s tx_buff; /**< TX buffer */
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91 | struct buffer_s rx_buff; /**< RX buffer */
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92 | uint8_t char_match; /**< Character to be matched */
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93 | uint8_t char_found; /**< State of the matched character */
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94 | } serial_t;
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95 |
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96 | #else
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97 | /** Non-asynch serial HAL structure
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98 | */
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99 | typedef struct serial_s serial_t;
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100 |
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101 | #endif
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102 |
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103 | #ifdef __cplusplus
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104 | extern "C" {
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105 | #endif
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106 |
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107 | /**
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108 | * \defgroup hal_GeneralSerial Serial Configuration Functions
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109 | * @{
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110 | */
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111 |
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112 | /** Initialize the serial peripheral. It sets the default parameters for serial
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113 | * peripheral, and configures its specifieds pins.
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114 | *
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115 | * @param obj The serial object
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116 | * @param tx The TX pin name
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117 | * @param rx The RX pin name
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118 | */
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119 | void serial_init(serial_t *obj, PinName tx, PinName rx);
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120 |
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121 | /** Release the serial peripheral, not currently invoked. It requires further
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122 | * resource management.
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123 | *
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124 | * @param obj The serial object
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125 | */
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126 | void serial_free(serial_t *obj);
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127 |
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128 | /** Configure the baud rate
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129 | *
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130 | * @param obj The serial object
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131 | * @param baudrate The baud rate to be configured
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132 | */
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133 | void serial_baud(serial_t *obj, int baudrate);
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134 |
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135 | /** Configure the format. Set the number of bits, parity and the number of stop bits
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136 | *
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137 | * @param obj The serial object
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138 | * @param data_bits The number of data bits
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139 | * @param parity The parity
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140 | * @param stop_bits The number of stop bits
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141 | */
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142 | void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_bits);
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143 |
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144 | /** The serial interrupt handler registration
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145 | *
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146 | * @param obj The serial object
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147 | * @param handler The interrupt handler which will be invoked when the interrupt fires
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148 | * @param id The SerialBase object
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149 | */
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150 | void serial_irq_handler(serial_t *obj, uart_irq_handler handler, uint32_t id);
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151 |
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152 | /** Configure serial interrupt. This function is used for word-approach
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153 | *
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154 | * @param obj The serial object
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155 | * @param irq The serial IRQ type (RX or TX)
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156 | * @param enable Set to non-zero to enable events, or zero to disable them
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157 | */
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158 | void serial_irq_set(serial_t *obj, SerialIrq irq, uint32_t enable);
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159 |
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160 | /** Get character. This is a blocking call, waiting for a character
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161 | *
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162 | * @param obj The serial object
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163 | */
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164 | int serial_getc(serial_t *obj);
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165 |
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166 | /** Send a character. This is a blocking call, waiting for a peripheral to be available
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167 | * for writing
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168 | *
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169 | * @param obj The serial object
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170 | * @param c The character to be sent
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171 | */
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172 | void serial_putc(serial_t *obj, int c);
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173 |
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174 | /** Check if the serial peripheral is readable
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175 | *
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176 | * @param obj The serial object
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177 | * @return Non-zero value if a character can be read, 0 if nothing to read
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178 | */
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179 | int serial_readable(serial_t *obj);
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180 |
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181 | /** Check if the serial peripheral is writable
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182 | *
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183 | * @param obj The serial object
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184 | * @return Non-zero value if a character can be written, 0 otherwise.
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185 | */
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186 | int serial_writable(serial_t *obj);
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187 |
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188 | /** Clear the serial peripheral
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189 | *
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190 | * @param obj The serial object
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191 | */
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192 | void serial_clear(serial_t *obj);
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193 |
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194 | /** Set the break
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195 | *
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196 | * @param obj The serial object
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197 | */
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198 | void serial_break_set(serial_t *obj);
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199 |
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200 | /** Clear the break
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201 | *
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202 | * @param obj The serial object
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203 | */
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204 | void serial_break_clear(serial_t *obj);
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205 |
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206 | /** Configure the TX pin for UART function.
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207 | *
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208 | * @param tx The pin name used for TX
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209 | */
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210 | void serial_pinout_tx(PinName tx);
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211 |
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212 | /** Configure the serial for the flow control. It sets flow control in the hardware
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213 | * if a serial peripheral supports it, otherwise software emulation is used.
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214 | *
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215 | * @param obj The serial object
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216 | * @param type The type of the flow control. Look at the available FlowControl types.
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217 | * @param rxflow The TX pin name
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218 | * @param txflow The RX pin name
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219 | */
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220 | void serial_set_flow_control(serial_t *obj, FlowControl type, PinName rxflow, PinName txflow);
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221 |
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222 | #if DEVICE_SERIAL_ASYNCH
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223 |
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224 | /**@}*/
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225 |
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226 | /**
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227 | * \defgroup hal_AsynchSerial Asynchronous Serial Hardware Abstraction Layer
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228 | * @{
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229 | */
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230 |
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231 | /** Begin asynchronous TX transfer. The used buffer is specified in the serial object,
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232 | * tx_buff
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233 | *
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234 | * @param obj The serial object
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235 | * @param tx The transmit buffer
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236 | * @param tx_length The number of bytes to transmit
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237 | * @param tx_width Deprecated argument
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238 | * @param handler The serial handler
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239 | * @param event The logical OR of events to be registered
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240 | * @param hint A suggestion for how to use DMA with this transfer
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241 | * @return Returns number of data transfered, otherwise returns 0
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242 | */
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243 | int serial_tx_asynch(serial_t *obj, const void *tx, size_t tx_length, uint8_t tx_width, uint32_t handler, uint32_t event, DMAUsage hint);
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244 |
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245 | /** Begin asynchronous RX transfer (enable interrupt for data collecting)
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246 | * The used buffer is specified in the serial object - rx_buff
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247 | *
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248 | * @param obj The serial object
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249 | * @param rx The receive buffer
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250 | * @param rx_length The number of bytes to receive
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251 | * @param rx_width Deprecated argument
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252 | * @param handler The serial handler
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253 | * @param event The logical OR of events to be registered
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254 | * @param handler The serial handler
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255 | * @param char_match A character in range 0-254 to be matched
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256 | * @param hint A suggestion for how to use DMA with this transfer
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257 | */
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258 | void serial_rx_asynch(serial_t *obj, void *rx, size_t rx_length, uint8_t rx_width, uint32_t handler, uint32_t event, uint8_t char_match, DMAUsage hint);
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259 |
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260 | /** Attempts to determine if the serial peripheral is already in use for TX
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261 | *
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262 | * @param obj The serial object
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263 | * @return Non-zero if the RX transaction is ongoing, 0 otherwise
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264 | */
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265 | uint8_t serial_tx_active(serial_t *obj);
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266 |
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267 | /** Attempts to determine if the serial peripheral is already in use for RX
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268 | *
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269 | * @param obj The serial object
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270 | * @return Non-zero if the RX transaction is ongoing, 0 otherwise
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271 | */
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272 | uint8_t serial_rx_active(serial_t *obj);
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273 |
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274 | /** The asynchronous TX and RX handler.
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275 | *
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276 | * @param obj The serial object
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277 | * @return Returns event flags if an RX transfer termination condition was met; otherwise returns 0
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278 | */
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279 | int serial_irq_handler_asynch(serial_t *obj);
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280 |
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281 | /** Abort the ongoing TX transaction. It disables the enabled interupt for TX and
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282 | * flushes the TX hardware buffer if TX FIFO is used
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283 | *
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284 | * @param obj The serial object
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285 | */
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286 | void serial_tx_abort_asynch(serial_t *obj);
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287 |
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288 | /** Abort the ongoing RX transaction. It disables the enabled interrupt for RX and
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289 | * flushes the RX hardware buffer if RX FIFO is used
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290 | *
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291 | * @param obj The serial object
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292 | */
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293 | void serial_rx_abort_asynch(serial_t *obj);
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294 |
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295 | /**@}*/
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296 |
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297 | #endif
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298 |
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299 | #ifdef __cplusplus
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300 | }
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301 | #endif
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302 |
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303 | #endif
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304 |
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305 | #endif
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306 |
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307 | /** @}*/
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