1 | /* Copyright (c) 2011, Peter Barrett
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2 | **
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3 | ** Permission to use, copy, modify, and/or distribute this software for
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4 | ** any purpose with or without fee is hereby granted, provided that the
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5 | ** above copyright notice and this permission notice appear in all copies.
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6 | **
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7 | ** THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
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8 | ** WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
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9 | ** WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR
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10 | ** BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES
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11 | ** OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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12 | ** WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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13 | ** ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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14 | ** SOFTWARE.
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15 | */
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16 |
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17 | #include <stdlib.h>
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18 | #include <stdio.h>
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19 | #include <stdint.h>
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20 |
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21 | // Include Atmel headers
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22 | #include "Arduino.h"
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23 | #include "sam.h"
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24 | #include "wiring_constants.h"
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25 | #include "USBCore.h"
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26 | #include "USB/USB_device.h"
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27 | #include "USBDesc.h"
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28 | #include "USBAPI.h"
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29 |
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30 | #include "Reset.h"
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31 |
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32 |
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33 | #ifdef CDC_ENABLED
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34 |
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35 | #define CDC_SERIAL_BUFFER_SIZE 64
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36 |
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37 | /* For information purpose only since RTS is not always handled by the terminal application */
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38 | #define CDC_LINESTATE_DTR 0x01 // Data Terminal Ready
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39 | #define CDC_LINESTATE_RTS 0x02 // Ready to Send
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40 |
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41 | #define CDC_LINESTATE_READY (CDC_LINESTATE_RTS | CDC_LINESTATE_DTR)
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42 |
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43 | struct ring_buffer
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44 | {
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45 | uint8_t buffer[CDC_SERIAL_BUFFER_SIZE];
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46 | volatile uint32_t head;
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47 | volatile uint32_t tail;
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48 | };
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49 |
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50 | ring_buffer cdc_rx_buffer = { { 0 }, 0, 0};
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51 |
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52 | typedef struct
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53 | {
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54 | uint32_t dwDTERate;
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55 | uint8_t bCharFormat;
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56 | uint8_t bParityType;
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57 | uint8_t bDataBits;
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58 | uint8_t lineState;
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59 | } LineInfo;
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60 |
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61 | _Pragma("pack(1)")
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62 | static volatile LineInfo _usbLineInfo = {
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63 | 115200, // dWDTERate
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64 | 0x00, // bCharFormat
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65 | 0x00, // bParityType
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66 | 0x08, // bDataBits
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67 | 0x00 // lineState
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68 | };
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69 |
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70 | static const CDCDescriptor _cdcInterface =
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71 | {
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72 | #if (defined CDC_ENABLED) && defined(HID_ENABLED)
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73 | D_IAD(0, 2, CDC_COMMUNICATION_INTERFACE_CLASS, CDC_ABSTRACT_CONTROL_MODEL, 0),
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74 | #endif
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75 | // CDC communication interface
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76 | D_INTERFACE(CDC_ACM_INTERFACE,1,CDC_COMMUNICATION_INTERFACE_CLASS,CDC_ABSTRACT_CONTROL_MODEL,0),
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77 | D_CDCCS( CDC_HEADER, CDC_V1_10 & 0xFF, (CDC_V1_10>>8) & 0x0FF ), // Header (1.10 bcd)
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78 |
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79 | D_CDCCS4(CDC_ABSTRACT_CONTROL_MANAGEMENT,6), // SET_LINE_CODING, GET_LINE_CODING, SET_CONTROL_LINE_STATE supported
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80 | D_CDCCS(CDC_UNION,CDC_ACM_INTERFACE,CDC_DATA_INTERFACE), // Communication interface is master, data interface is slave 0
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81 | D_CDCCS(CDC_CALL_MANAGEMENT,1,1), // Device handles call management (not)
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82 | D_ENDPOINT(USB_ENDPOINT_IN (CDC_ENDPOINT_ACM),USB_ENDPOINT_TYPE_INTERRUPT,0x10, 0x10),
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83 |
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84 | // CDC data interface
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85 | D_INTERFACE(CDC_DATA_INTERFACE,2,CDC_DATA_INTERFACE_CLASS,0,0),
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86 | D_ENDPOINT(USB_ENDPOINT_OUT(CDC_ENDPOINT_OUT),USB_ENDPOINT_TYPE_BULK,EPX_SIZE,0),
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87 | D_ENDPOINT(USB_ENDPOINT_IN (CDC_ENDPOINT_IN ),USB_ENDPOINT_TYPE_BULK,EPX_SIZE,0)
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88 | };
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89 | _Pragma("pack()")
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90 |
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91 | const void* WEAK CDC_GetInterface(void)
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92 | {
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93 | return &_cdcInterface;
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94 | }
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95 |
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96 | uint32_t WEAK CDC_GetInterfaceLength(void)
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97 | {
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98 | return sizeof( _cdcInterface );
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99 | }
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100 |
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101 | bool WEAK CDC_Setup(Setup& setup)
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102 | {
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103 | uint8_t r = setup.bRequest;
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104 | uint8_t requestType = setup.bmRequestType;
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105 |
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106 | if (REQUEST_DEVICETOHOST_CLASS_INTERFACE == requestType)
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107 | {
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108 | if (CDC_GET_LINE_CODING == r)
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109 | {
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110 | USBD_SendControl(0,(void*)&_usbLineInfo,7);
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111 | return true;
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112 | }
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113 | }
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114 |
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115 | if (REQUEST_HOSTTODEVICE_CLASS_INTERFACE == requestType)
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116 | {
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117 | if (CDC_SET_LINE_CODING == r)
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118 | {
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119 | while( UDD_FifoByteCount(EP0) <15);
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120 | //USBD_RecvControl((void*)&_usbLineInfo,7);
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121 | uint8_t* line = (uint8_t*)&_usbLineInfo;
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122 | for(uint8_t i = 0; i<7; i++)
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123 | line[i] = setup.data[i];
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124 | return false;
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125 | }
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126 |
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127 | if (CDC_SET_CONTROL_LINE_STATE == r)
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128 | {
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129 | _usbLineInfo.lineState = setup.wValueL;
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130 | // auto-reset into the bootloader is triggered when the port, already
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131 | // open at 1200 bps, is closed.
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132 | if (1200 == _usbLineInfo.dwDTERate)
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133 | {
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134 | // We check DTR state to determine if host port is open (bit 0 of lineState).
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135 | if ((_usbLineInfo.lineState & 0x01) == 0)
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136 | initiateReset(250);
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137 | else
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138 | cancelReset();
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139 | }
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140 | return false;
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141 | }
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142 | }
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143 | return false;
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144 | }
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145 |
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146 | uint32_t _serialPeek = -1;
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147 | void Serial_::begin(uint32_t baud_count)
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148 | {
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149 | }
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150 |
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151 | void Serial_::begin(uint32_t baud_count, uint8_t config)
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152 | {
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153 | }
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154 |
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155 | void Serial_::end(void)
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156 | {
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157 | }
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158 |
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159 | void Serial_::accept(void)
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160 | {
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161 | ring_buffer *buffer = &cdc_rx_buffer;
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162 | uint32_t i = (uint32_t)(buffer->head+1) % CDC_SERIAL_BUFFER_SIZE;
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163 |
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164 | // if we should be storing the received character into the location
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165 | // just before the tail (meaning that the head would advance to the
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166 | // current location of the tail), we're about to overflow the buffer
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167 | // and so we don't write the character or advance the head.
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168 | while (i != buffer->tail) {
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169 | uint32_t c;
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170 | if (!USBD_Available(CDC_ENDPOINT_OUT)) {
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171 | UDD_ReleaseRX(CDC_ENDPOINT_OUT);
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172 | break;
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173 | }
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174 | c = USBD_Recv(CDC_ENDPOINT_OUT);
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175 | buffer->buffer[buffer->head] = c;
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176 | buffer->head = i;
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177 |
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178 | i = (i + 1) % CDC_SERIAL_BUFFER_SIZE;
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179 | }
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180 | }
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181 |
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182 | int Serial_::available(void)
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183 | {
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184 | ring_buffer *buffer = &cdc_rx_buffer;
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185 | return (uint32_t)(CDC_SERIAL_BUFFER_SIZE + buffer->head - buffer->tail) % CDC_SERIAL_BUFFER_SIZE;
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186 | }
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187 |
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188 | int Serial_::peek(void)
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189 | {
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190 | ring_buffer *buffer = &cdc_rx_buffer;
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191 |
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192 | if (buffer->head == buffer->tail)
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193 | {
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194 | return -1;
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195 | }
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196 | else
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197 | {
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198 | return buffer->buffer[buffer->tail];
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199 | }
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200 | }
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201 |
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202 | int Serial_::read(void)
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203 | {
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204 | ring_buffer *buffer = &cdc_rx_buffer;
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205 |
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206 | // if the head isn't ahead of the tail, we don't have any characters
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207 | if (buffer->head == buffer->tail)
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208 | {
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209 | return -1;
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210 | }
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211 | else
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212 | {
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213 | unsigned char c = buffer->buffer[buffer->tail];
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214 | buffer->tail = (uint32_t)(buffer->tail + 1) % CDC_SERIAL_BUFFER_SIZE;
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215 | if (USBD_Available(CDC_ENDPOINT_OUT))
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216 | accept();
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217 | return c;
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218 | }
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219 | }
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220 |
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221 | void Serial_::flush(void)
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222 | {
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223 | USBD_Flush(CDC_ENDPOINT_IN);
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224 | }
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225 |
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226 | size_t Serial_::write(const uint8_t *buffer, size_t size)
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227 | {
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228 | /* only try to send bytes if the high-level CDC connection itself
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229 | is open (not just the pipe) - the OS should set lineState when the port
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230 | is opened and clear lineState when the port is closed.
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231 | bytes sent before the user opens the connection or after
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232 | the connection is closed are lost - just like with a UART. */
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233 |
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234 | {
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235 | uint32_t r = USBD_Send(CDC_ENDPOINT_IN, buffer, size);
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236 |
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237 | if (r > 0)
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238 | {
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239 | return r;
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240 | } else
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241 | {
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242 | setWriteError();
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243 | return 0;
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244 | }
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245 | }
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246 | setWriteError();
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247 | return 0;
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248 | }
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249 |
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250 | size_t Serial_::write(uint8_t c) {
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251 | return write(&c, 1);
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252 | }
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253 |
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254 | // This operator is a convenient way for a sketch to check whether the
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255 | // port has actually been configured and opened by the host (as opposed
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256 | // to just being connected to the host). It can be used, for example, in
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257 | // setup() before printing to ensure that an application on the host is
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258 | // actually ready to receive and display the data.
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259 | // We add a short delay before returning to fix a bug observed by Federico
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260 | // where the port is configured (lineState != 0) but not quite opened.
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261 |
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262 | Serial_::operator bool()
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263 | {
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264 | // this is here to avoid spurious opening after upload
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265 | if (millis() < 500)
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266 | return false;
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267 |
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268 | bool result = false;
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269 |
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270 | if (_usbLineInfo.lineState > 0)
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271 | {
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272 | result = true;
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273 | }
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274 |
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275 | delay(10);
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276 | return result;
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277 | }
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278 |
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279 | Serial_ SerialUSB;
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280 |
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281 | #endif
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