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2512
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1 /*========================================================================== |
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2 // |
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3 // adc.c |
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4 // |
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5 // Generic ADC driver layer |
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6 // |
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7 //========================================================================== |
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8 //####ECOSGPLCOPYRIGHTBEGIN#### |
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9 // ------------------------------------------- |
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10 // This file is part of eCos, the Embedded Configurable Operating System. |
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11 // Copyright (C) 2008 eCosCentric Limited |
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12 // |
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13 // eCos is free software; you can redistribute it and/or modify it under |
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14 // the terms of the GNU General Public License as published by the Free |
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15 // Software Foundation; either version 2 or (at your option) any later version. |
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16 // |
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17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY |
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18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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20 // for more details. |
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21 // |
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22 // You should have received a copy of the GNU General Public License along |
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23 // with eCos; if not, write to the Free Software Foundation, Inc., |
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24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. |
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25 // |
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26 // As a special exception, if other files instantiate templates or use macros |
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27 // or inline functions from this file, or you compile this file and link it |
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28 // with other works to produce a work based on this file, this file does not |
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29 // by itself cause the resulting work to be covered by the GNU General Public |
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30 // License. However the source code for this file must still be made available |
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31 // in accordance with section (3) of the GNU General Public License. |
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32 // |
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33 // This exception does not invalidate any other reasons why a work based on |
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34 // this file might be covered by the GNU General Public License. |
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35 // ------------------------------------------- |
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36 //####ECOSGPLCOPYRIGHTEND#### |
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37 //========================================================================== |
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38 //#####DESCRIPTIONBEGIN#### |
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39 // |
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40 // Author(s): nickg |
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41 // Date: 2008-03-31 |
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42 // Description: Implements generic layer of ADC drivers. |
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43 // |
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44 //####DESCRIPTIONEND#### |
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45 // |
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46 //========================================================================*/ |
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47 |
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48 #include <cyg/io/adc.h> |
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49 |
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50 //========================================================================== |
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51 // Diagnostic support |
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52 // |
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53 // Switch the #if to 1 to generate some diagnostic messages. |
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54 |
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55 #if 0 |
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56 |
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57 #include <cyg/infra/diag.h> |
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58 |
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59 #define adc_diag( __fmt, ... ) diag_printf("ADC: %30s[%4d]: " __fmt, __FUNCTION__, __LINE__, ## __VA_ARGS__ ); |
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60 #define adc_dump_buf( __buf, __size ) diag_dump_buf( __buf, __size ) |
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61 #else |
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62 #define adc_diag( __fmt, ... ) |
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63 #define adc_dump_buf( __buf, __size ) |
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64 #endif |
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65 |
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66 //========================================================================== |
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67 // Main device table entry functions |
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68 |
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69 static Cyg_ErrNo adc_write(cyg_io_handle_t handle, const void *buf, cyg_uint32 *len); |
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70 static Cyg_ErrNo adc_read(cyg_io_handle_t handle, void *buf, cyg_uint32 *len); |
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71 static cyg_bool adc_select(cyg_io_handle_t handle, cyg_uint32 which, CYG_ADDRWORD info); |
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72 static Cyg_ErrNo adc_get_config(cyg_io_handle_t handle, cyg_uint32 key, void *buf, cyg_uint32 *len); |
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73 static Cyg_ErrNo adc_set_config(cyg_io_handle_t handle, cyg_uint32 key, const void *buf, cyg_uint32 *len); |
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74 |
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75 DEVIO_TABLE(cyg_io_adc_devio, |
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76 adc_write, |
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77 adc_read, |
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78 adc_select, |
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79 adc_get_config, |
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80 adc_set_config |
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81 ); |
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82 |
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83 //========================================================================== |
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84 // Device interface functions |
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85 |
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86 //-------------------------------------------------------------------------- |
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87 // Device write |
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88 // |
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89 // Not supported |
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90 |
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91 static Cyg_ErrNo adc_write(cyg_io_handle_t handle, const void *buf, cyg_uint32 *len) |
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92 { |
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93 adc_diag("write not supported\n"); |
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94 return -EDEVNOSUPP; |
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95 } |
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96 |
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97 //-------------------------------------------------------------------------- |
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98 // Device Read |
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99 // |
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100 // Returns a whole number of samples from a channel |
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101 |
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102 static Cyg_ErrNo adc_read(cyg_io_handle_t handle, void *abuf, cyg_uint32 *len) |
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103 { |
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104 Cyg_ErrNo res = ENOERR; |
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105 cyg_devtab_entry_t *t = (cyg_devtab_entry_t *)handle; |
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106 cyg_adc_channel *chan = (cyg_adc_channel *)t->priv; |
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107 cyg_adc_device *dev = chan->device; |
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108 |
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109 cyg_adc_sample_t *buf = (cyg_adc_sample_t *)abuf; |
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110 cyg_uint32 size = 0; |
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111 |
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112 adc_diag("chan %d buf %p len %u\n", chan->channel, abuf, *len); |
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113 |
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114 // Check that supplied buffer address is aligned to sample size. |
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115 if( (((CYG_ADDRESS)buf) & (sizeof(cyg_adc_sample_t)-1)) != 0 ) |
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116 return -EIO; |
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117 |
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118 // Check that channel is enabled |
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119 if( !chan->enabled ) |
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120 return -EIO; |
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121 |
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122 cyg_drv_mutex_lock( &dev->lock ); |
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123 cyg_drv_dsr_lock(); |
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124 { |
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125 while( (*len-size) >= sizeof(cyg_adc_sample_t) ) |
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126 { |
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127 if( chan->put != chan->get ) |
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128 { |
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129 // A sample is available, transfer it to the buffer. |
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130 |
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131 int next = chan->get+1; |
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132 cyg_drv_isr_lock(); |
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133 { |
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134 *buf++ = chan->buf[chan->get]; |
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135 if( next == chan->len ) |
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136 next = 0; |
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137 chan->get = next; |
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138 } |
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139 cyg_drv_isr_unlock(); |
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140 size += sizeof(cyg_adc_sample_t); |
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141 |
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142 adc_diag("chan %d sample %d -> %04x\n", chan->channel, size, buf[-1] ); |
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143 } |
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144 else |
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145 { |
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146 // If there is no data available, either wait or |
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147 // return EAGAIN. |
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148 |
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149 if( !chan->blocking ) |
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150 { |
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151 // If non-blocking, return what we have. If |
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152 // nothing, return EAGAIN. |
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153 *len = size; |
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154 if( size == 0 ) |
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155 res = -EAGAIN; |
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156 break; |
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157 } |
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158 // Otherwise, we must wait for data to arrive. |
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159 |
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160 adc_diag("wait for sample\n"); |
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161 chan->waiting = true; |
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162 if( !cyg_drv_cond_wait( &chan->wait ) ) |
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163 { |
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164 // Abort the wait, return EINTR |
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165 adc_diag("abort\n"); |
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166 *len = size; |
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167 res = -EINTR; |
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168 break; |
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169 } |
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170 |
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171 adc_diag("wake up\n"); |
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172 // Loop back round to pick up any samples now |
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173 // available. |
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174 } |
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175 } |
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176 } |
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177 cyg_drv_dsr_unlock(); |
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178 cyg_drv_mutex_unlock( &dev->lock ); |
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179 |
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180 return res; |
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181 } |
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182 |
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183 //-------------------------------------------------------------------------- |
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184 // Select support |
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185 // |
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186 // If select support is enabled, check for pending samples. |
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187 |
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188 static cyg_bool adc_select(cyg_io_handle_t handle, cyg_uint32 which, CYG_ADDRWORD info) |
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189 { |
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190 #ifdef CYGPKG_IO_ADC_SELECT_SUPPORT |
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191 |
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192 cyg_bool res = false; |
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193 cyg_devtab_entry_t *t = (cyg_devtab_entry_t *)handle; |
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194 cyg_adc_channel *chan = (cyg_adc_channel *)t->priv; |
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195 cyg_adc_device *dev = chan->device; |
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196 |
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197 // Check that channel is enabled. If not, return false. |
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198 if( !chan->enabled ) |
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199 return false; |
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200 |
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201 // Only read select is supported |
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202 if( which == CYG_FREAD ) |
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203 { |
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204 cyg_drv_mutex_lock( &dev->lock ); |
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205 cyg_drv_dsr_lock(); |
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206 { |
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207 cyg_drv_isr_lock(); |
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208 if( chan->put == chan->get ) |
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209 { |
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210 // There is no data in the buffer, register the select. |
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211 |
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212 cyg_selrecord( info, &chan->selinfo ); |
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213 } |
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214 else |
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215 { |
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216 res = true; |
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217 } |
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218 cyg_drv_isr_unlock(); |
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219 } |
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220 cyg_drv_dsr_unlock(); |
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221 cyg_drv_mutex_unlock( &dev->lock ); |
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222 |
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223 } |
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224 |
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225 return res; |
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226 |
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227 #else |
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228 |
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229 return true; |
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230 |
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231 #endif |
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232 } |
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233 |
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234 //-------------------------------------------------------------------------- |
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235 // Get config |
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236 // |
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237 // Return various configuration options. |
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238 |
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239 static Cyg_ErrNo adc_get_config(cyg_io_handle_t handle, cyg_uint32 key, void *xbuf, cyg_uint32 *len) |
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240 { |
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241 cyg_devtab_entry_t *t = (cyg_devtab_entry_t *)handle; |
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242 cyg_adc_channel *chan = (cyg_adc_channel *)t->priv; |
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243 cyg_adc_info_t *buf = (cyg_adc_info_t *)xbuf; |
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244 Cyg_ErrNo res = ENOERR; |
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245 |
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246 adc_diag("chan %d\n", chan->channel ); |
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247 switch( key ) |
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248 { |
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249 case CYG_IO_GET_CONFIG_ADC_RATE: |
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250 *buf = chan->device->config; |
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251 break; |
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252 |
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253 case CYG_IO_GET_CONFIG_READ_BLOCKING: |
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254 if (*len < sizeof(cyg_uint32)) |
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255 return -EINVAL; |
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256 *(cyg_uint32*)xbuf = (chan->blocking) ? 1 : 0; |
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257 break; |
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258 |
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259 |
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260 default: |
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261 res = -EINVAL; |
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262 } |
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263 |
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264 return res; |
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265 } |
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266 |
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267 //-------------------------------------------------------------------------- |
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268 // Set config |
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269 // |
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270 // Set configuration options. |
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271 |
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272 static Cyg_ErrNo adc_set_config(cyg_io_handle_t handle, cyg_uint32 key, const void *xbuf, cyg_uint32 *len) |
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273 { |
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274 |
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275 cyg_devtab_entry_t *t = (cyg_devtab_entry_t *)handle; |
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276 cyg_adc_channel *chan = (cyg_adc_channel *)t->priv; |
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277 cyg_adc_info_t *buf = (cyg_adc_info_t *)xbuf; |
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278 Cyg_ErrNo res = ENOERR; |
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279 |
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280 adc_diag("chan %d\n", chan->channel ); |
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281 |
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282 switch( key ) |
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283 { |
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284 case CYG_IO_SET_CONFIG_ADC_RATE: |
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285 chan->device->config = *buf; |
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286 chan->device->funs->set_rate( chan, buf->rate ); |
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287 break; |
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288 |
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289 case CYG_IO_SET_CONFIG_ADC_ENABLE: |
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290 chan->enabled = true; |
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291 chan->device->funs->enable( chan ); |
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292 break; |
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293 |
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294 case CYG_IO_SET_CONFIG_ADC_DISABLE: |
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295 chan->enabled = false; |
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296 chan->device->funs->disable( chan ); |
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297 break; |
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298 |
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299 case CYG_IO_SET_CONFIG_READ_BLOCKING: |
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300 if (*len < sizeof(cyg_uint32)) |
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301 return -EINVAL; |
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302 |
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303 chan->blocking = (1 == *(cyg_uint32*)xbuf) ? true : false; |
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304 break; |
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305 |
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306 default: |
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307 res = -EINVAL; |
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308 } |
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309 |
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310 return res; |
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311 } |
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312 |
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313 //========================================================================== |
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314 // Callbacks from hardware driver to generic layer |
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315 |
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316 //-------------------------------------------------------------------------- |
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317 // Initialize generic device structure |
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318 |
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319 __externC void cyg_adc_device_init( cyg_adc_device *device ) |
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320 { |
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321 if( device->init ) |
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322 return; |
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323 |
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324 adc_diag("\n"); |
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325 |
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326 device->init = true; |
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327 cyg_drv_mutex_init( &device->lock ); |
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328 } |
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329 |
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330 //-------------------------------------------------------------------------- |
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331 // Initialize generic channel structure |
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332 |
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333 __externC void cyg_adc_channel_init(cyg_adc_channel *chan) |
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334 { |
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335 if( chan->init ) |
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336 return; |
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337 |
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338 adc_diag("chan %d\n", chan->channel ); |
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339 |
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340 chan->init = true; |
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341 cyg_drv_cond_init( &chan->wait, &chan->device->lock ); |
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342 chan->enabled = false; |
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343 chan->waiting = false; |
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344 chan->wakeup = false; |
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345 chan->blocking = true; |
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346 chan->overflow = 0; |
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347 |
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348 #ifdef CYGPKG_IO_ADC_SELECT_SUPPORT |
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349 cyg_selinit( &chan->selinfo ); |
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350 #endif |
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351 |
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352 } |
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353 |
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354 //-------------------------------------------------------------------------- |
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355 // Add a new sample to the buffer |
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356 // |
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357 // This function is called from the ISR to store a sample in the |
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358 // buffer. |
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359 |
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360 __externC cyg_uint32 cyg_adc_receive_sample(cyg_adc_channel *chan, cyg_adc_sample_t sample) |
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361 { |
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362 cyg_uint32 res = 0; |
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363 int next = chan->put+1; |
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364 |
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365 adc_diag("chan %d sample %04x\n", chan->channel, sample ); |
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366 |
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367 // Ignore this sample if the channel is not enabled. |
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368 if( !chan->enabled ) |
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369 return 0; |
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370 |
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371 if( next == chan->len ) |
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372 next = 0; |
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373 |
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374 if( next == chan->get ) |
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375 { |
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376 // The buffer is full. Record an overflow and arrange to |
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377 // replace the oldest sample with the new one. |
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378 |
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379 adc_diag("chan %d overflow\n", chan->channel); |
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380 chan->overflow++; |
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381 |
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382 chan->get++; |
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383 if( chan->get == chan->len ) |
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384 chan->get = 0; |
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385 } |
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386 |
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387 // If this is the first sample into the buffer, wake any waiting |
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388 // selectors. Also do this if there are any threads waiting for |
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389 // data. |
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390 if( chan->put == chan->get || chan->waiting ) |
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391 res |= CYG_ISR_CALL_DSR, chan->wakeup = true; |
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392 |
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393 // Store the new sample |
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394 chan->buf[chan->put] = sample; |
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395 chan->put = next; |
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396 |
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397 return res; |
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398 } |
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399 |
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400 //-------------------------------------------------------------------------- |
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401 // Wakeup a channel |
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402 // |
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403 // This function is called from the DSR if the channel wakeup field is |
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404 // set. It satisfies any select operations or any waiting readers. |
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405 |
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406 __externC void cyg_adc_wakeup(cyg_adc_channel *chan ) |
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407 { |
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408 adc_diag("chan %d\n", chan->channel ); |
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409 |
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410 #ifdef CYGPKG_IO_ADC_SELECT_SUPPORT |
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411 cyg_selwakeup( &chan->selinfo ); |
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412 #endif |
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413 |
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414 chan->waiting = false; |
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415 cyg_drv_cond_signal( &chan->wait ); |
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416 |
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417 chan->wakeup = false; |
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418 } |
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419 |
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420 //========================================================================== |
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421 // End of adc.c |
