1 | /*
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2 | Copyright (c) 2014 Arduino. All right reserved.
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3 |
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4 | This library is free software; you can redistribute it and/or
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5 | modify it under the terms of the GNU Lesser General Public
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6 | License as published by the Free Software Foundation; either
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7 | version 2.1 of the License, or (at your option) any later version.
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8 |
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9 | This library is distributed in the hope that it will be useful,
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10 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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12 | See the GNU Lesser General Public License for more details.
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13 |
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14 | You should have received a copy of the GNU Lesser General Public
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15 | License along with this library; if not, write to the Free Software
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16 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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17 | */
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18 |
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19 |
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20 | #include "wiring_digital.h"
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21 | #include "WVariant.h"
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22 |
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23 | #ifdef __cplusplus
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24 | extern "C" {
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25 | #endif
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26 |
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27 | int pinPeripheral( uint32_t ulPin, EPioType ulPeripheral )
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28 | {
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29 | if ( g_APinDescription[ulPin].ulPinType == PIO_NOT_A_PIN )
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30 | {
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31 | return -1 ;
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32 | }
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33 |
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34 | switch ( ulPeripheral )
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35 | {
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36 | case PIO_DIGITAL:
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37 | case PIO_INPUT:
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38 | case PIO_INPUT_PULLUP:
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39 | case PIO_OUTPUT:
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40 | // Disable peripheral muxing, done in pinMode
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41 | // Configure pin mode, if requested
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42 | if ( ulPeripheral == PIO_INPUT )
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43 | {
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44 | pinMode( ulPin, INPUT ) ;
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45 | }
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46 | else
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47 | {
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48 | if ( ulPeripheral == PIO_INPUT_PULLUP )
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49 | {
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50 | pinMode( ulPin, INPUT_PULLUP ) ;
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51 | }
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52 | else
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53 | {
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54 | if ( ulPeripheral == PIO_OUTPUT )
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55 | {
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56 | pinMode( ulPin, OUTPUT ) ;
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57 | }
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58 | else
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59 | {
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60 | // do notting
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61 | }
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62 | }
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63 | }
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64 | break ;
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65 |
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66 | case PIO_ANALOG:
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67 | case PIO_SERCOM:
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68 | case PIO_SERCOM_ALT:
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69 | case PIO_TIMER:
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70 | case PIO_TIMER_ALT:
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71 | case PIO_EXTINT:
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72 | case PIO_COM:
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73 | case PIO_AC_CLK:
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74 | #if 0
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75 | // Is the pio pin in the lower 16 ones?
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76 | // The WRCONFIG register allows update of only 16 pin max out of 32
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77 | if ( g_APinDescription[ulPin].ulPin < 16 )
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78 | {
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79 | PORT->Group[g_APinDescription[ulPin].ulPort].WRCONFIG.reg = PORT_WRCONFIG_WRPMUX | PORT_WRCONFIG_PMUXEN | PORT_WRCONFIG_PMUX( ulPeripheral ) |
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80 | PORT_WRCONFIG_WRPINCFG |
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81 | PORT_WRCONFIG_PINMASK( g_APinDescription[ulPin].ulPin ) ;
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82 | }
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83 | else
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84 | {
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85 | PORT->Group[g_APinDescription[ulPin].ulPort].WRCONFIG.reg = PORT_WRCONFIG_HWSEL |
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86 | PORT_WRCONFIG_WRPMUX | PORT_WRCONFIG_PMUXEN | PORT_WRCONFIG_PMUX( ulPeripheral ) |
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87 | PORT_WRCONFIG_WRPINCFG |
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88 | PORT_WRCONFIG_PINMASK( g_APinDescription[ulPin].ulPin - 16 ) ;
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89 | }
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90 | #else
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91 | if ( g_APinDescription[ulPin].ulPin & 1 )
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92 | {
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93 | uint32_t temp ;
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94 |
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95 | // Get whole current setup for both odd and even pins and remove odd one
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96 | temp = (PORT->Group[g_APinDescription[ulPin].ulPort].PMUX[g_APinDescription[ulPin].ulPin >> 1].reg) & PORT_PMUX_PMUXE( 0xF ) ;
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97 | // Set new muxing
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98 | PORT->Group[g_APinDescription[ulPin].ulPort].PMUX[g_APinDescription[ulPin].ulPin >> 1].reg = temp|PORT_PMUX_PMUXO( ulPeripheral ) ;
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99 | // Enable port mux
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100 | PORT->Group[g_APinDescription[ulPin].ulPort].PINCFG[g_APinDescription[ulPin].ulPin].reg |= PORT_PINCFG_PMUXEN ;
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101 | }
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102 | else
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103 | {
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104 | uint32_t temp ;
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105 |
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106 | temp = (PORT->Group[g_APinDescription[ulPin].ulPort].PMUX[g_APinDescription[ulPin].ulPin >> 1].reg) & PORT_PMUX_PMUXO( 0xF ) ;
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107 | PORT->Group[g_APinDescription[ulPin].ulPort].PMUX[g_APinDescription[ulPin].ulPin >> 1].reg = temp|PORT_PMUX_PMUXE( ulPeripheral ) ;
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108 | PORT->Group[g_APinDescription[ulPin].ulPort].PINCFG[g_APinDescription[ulPin].ulPin].reg |= PORT_PINCFG_PMUXEN ; // Enable port mux
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109 | }
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110 | #endif
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111 | break ;
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112 |
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113 | case PIO_NOT_A_PIN:
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114 | return -1l ;
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115 | break ;
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116 | }
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117 |
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118 | return 0l ;
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119 | }
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120 |
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121 | void pinMode( uint32_t ulPin, uint32_t ulMode )
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122 | {
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123 | if ( g_APinDescription[ulPin].ulPinType == PIO_NOT_A_PIN )
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124 | {
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125 | return ;
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126 | }
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127 |
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128 | switch ( ulMode )
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129 | {
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130 | case INPUT:
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131 | // Set pin to input mode
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132 | PORT->Group[g_APinDescription[ulPin].ulPort].PINCFG[g_APinDescription[ulPin].ulPin].reg=(uint8_t)(PORT_PINCFG_INEN) ;
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133 | PORT->Group[g_APinDescription[ulPin].ulPort].DIRCLR.reg = (uint32_t)(1<<g_APinDescription[ulPin].ulPin) ;
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134 | break ;
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135 |
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136 | case INPUT_PULLUP:
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137 | // Set pin to input mode with pull-up resistor enabled
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138 | PORT->Group[g_APinDescription[ulPin].ulPort].PINCFG[g_APinDescription[ulPin].ulPin].reg=(uint8_t)(PORT_PINCFG_INEN|PORT_PINCFG_PULLEN) ;
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139 | PORT->Group[g_APinDescription[ulPin].ulPort].DIRCLR.reg = (uint32_t)(1<<g_APinDescription[ulPin].ulPin) ;
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140 |
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141 | //pull-upconfig
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142 | PORT->Group[g_APinDescription[ulPin].ulPort].OUTSET.reg = (uint32_t)(1<<g_APinDescription[ulPin].ulPin) ;
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143 | break ;
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144 |
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145 | case OUTPUT:
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146 | // Set pin to output mode
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147 | PORT->Group[g_APinDescription[ulPin].ulPort].PINCFG[g_APinDescription[ulPin].ulPin].reg&=~(uint8_t)(PORT_PINCFG_INEN) ;
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148 | PORT->Group[g_APinDescription[ulPin].ulPort].DIRSET.reg = (uint32_t)(1<<g_APinDescription[ulPin].ulPin) ;
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149 |
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150 | break ;
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151 |
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152 | default:
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153 | // do nothing
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154 | break ;
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155 | }
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156 | }
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157 |
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158 | void digitalWrite( uint32_t ulPin, uint32_t ulVal )
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159 | {
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160 | /* Handle the case the pin isn't usable as PIO */
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161 | if ( g_APinDescription[ulPin].ulPinType == PIO_NOT_A_PIN )
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162 | {
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163 | return ;
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164 | }
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165 |
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166 | // Enable pull-up resistor
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167 | PORT->Group[g_APinDescription[ulPin].ulPort].PINCFG[g_APinDescription[ulPin].ulPin].reg=(uint8_t)(PORT_PINCFG_PULLEN) ;
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168 |
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169 | switch ( ulVal )
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170 | {
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171 | case LOW:
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172 | PORT->Group[g_APinDescription[ulPin].ulPort].OUTCLR.reg = (1ul << g_APinDescription[ulPin].ulPin) ;
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173 | break ;
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174 |
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175 | case HIGH:
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176 | PORT->Group[g_APinDescription[ulPin].ulPort].OUTSET.reg = (1ul << g_APinDescription[ulPin].ulPin) ;
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177 | break ;
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178 |
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179 | default:
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180 | break ;
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181 | }
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182 |
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183 | return ;
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184 | }
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185 |
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186 | int digitalRead( uint32_t ulPin )
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187 | {
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188 | /* Handle the case the pin isn't usable as PIO */
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189 | if ( g_APinDescription[ulPin].ulPinType == PIO_NOT_A_PIN )
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190 | {
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191 | return LOW ;
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192 | }
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193 |
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194 | if ( (PORT->Group[g_APinDescription[ulPin].ulPort].IN.reg & (1ul << g_APinDescription[ulPin].ulPin)) != 0 )
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195 | {
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196 | return HIGH ;
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197 | }
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198 |
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199 | return LOW ;
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200 | }
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201 |
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202 | #ifdef __cplusplus
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203 | }
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204 | #endif
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205 |
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