Mercurial > ecos

annotate packages/hal/calmrisc32/ceb/current/src/ser.c @ 267:797015ac62f3

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Remove 'const' from channel information - it _can_ change (timeout period).
author gthomas
date Tue, 06 Aug 2002 16:00:08 +0000
parents d2c90368aeef
children 74dbf4c3f2e1
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 //=============================================================================
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2 //
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3 // ser.c
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4 //
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5 // Simple driver for the MDSChip serial port
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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) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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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 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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37 // at http://sources.redhat.com/ecos/ecos-license/
208
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38 // -------------------------------------------
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39 //####ECOSGPLCOPYRIGHTEND####
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40 //=============================================================================
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41 //#####DESCRIPTIONBEGIN####
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42 //
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43 // Author(s): msalter
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44 // Contributors:msalter
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45 // Date: 2001-02-12
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46 // Description: Simple driver for the MDSChip serial port
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47 //
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48 //####DESCRIPTIONEND####
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49 //
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50 //=============================================================================
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51
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52 #include <pkgconf/hal.h>
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53 #include <pkgconf/system.h>
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54 #include CYGBLD_HAL_PLATFORM_H
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55
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56 #include <cyg/hal/hal_arch.h> // SAVE/RESTORE GP macros
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57 #include <cyg/hal/hal_io.h> // IO macros
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58 #include <cyg/hal/hal_if.h> // interface API
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59 #include <cyg/hal/hal_intr.h> // HAL_ENABLE/MASK/UNMASK_INTERRUPTS
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60 #include <cyg/hal/hal_misc.h> // Helper functions
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61 #include <cyg/hal/drv_api.h> // CYG_ISR_HANDLED
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62
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63 // We have no control over baud rate
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64 #if CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL_BAUD==57600
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65 #define CYG_DEV_SERIAL_BAUD_DIVISOR BAUD_57600
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66 #endif
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67
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68 #ifndef CYG_DEV_SERIAL_BAUD_DIVISOR
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69 #error Missing/incorrect serial baud rate defined - CDL error?
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70 #endif
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71
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72 //-----------------------------------------------------------------------------
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73 typedef struct {
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74 cyg_uint8* base;
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75 cyg_int32 msec_timeout;
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76 int isr_vector;
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77 } channel_data_t;
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78
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79 static channel_data_t channels[1] = {
208
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80 { (cyg_uint8*)0, 1000, 0}
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81 };
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82
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83 //-----------------------------------------------------------------------------
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84 // The minimal init, get and put functions. All by polling.
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85
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86 void
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87 cyg_hal_plf_serial_init_channel(void* __ch_data)
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88 {
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89 cyg_hal_plf_write_sr_rbr(0);
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90 cyg_hal_plf_write_sr_tbr(0);
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91 cyg_hal_plf_write_tbr(0);
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92 cyg_hal_plf_write_rbr(0);
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93 }
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94
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95 void
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96 cyg_hal_plf_serial_putc(void* __ch_data, cyg_uint8 __ch)
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97 {
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98 // wait for tx rdy
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99 while (cyg_hal_plf_read_sr_tbr() != 0) ;
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100
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101 // Now, write it
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102 cyg_hal_plf_write_tbr(__ch);
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103
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104 // and set TBR
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105 cyg_hal_plf_write_sr_tbr(1);
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106 }
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107
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108 static cyg_bool
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109 cyg_hal_plf_serial_getc_nonblock(void* __ch_data, cyg_uint8* ch)
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110 {
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111 if (cyg_hal_plf_read_sr_rbr() == 0)
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112 return false;
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113
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114 *ch = cyg_hal_plf_read_rbr();
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115
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116 cyg_hal_plf_write_sr_rbr(0);
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117
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118 return true;
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119 }
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120
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121 cyg_uint8
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122 cyg_hal_plf_serial_getc(void* __ch_data)
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123 {
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124 cyg_uint8 ch;
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125
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126 while(!cyg_hal_plf_serial_getc_nonblock(__ch_data, &ch));
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127
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128 return ch;
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129 }
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130
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131 static void
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132 cyg_hal_plf_serial_write(void* __ch_data, const cyg_uint8* __buf,
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133 cyg_uint32 __len)
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134 {
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135 while(__len-- > 0)
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136 cyg_hal_plf_serial_putc(__ch_data, *__buf++);
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137 }
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138
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139 static void
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140 cyg_hal_plf_serial_read(void* __ch_data, cyg_uint8* __buf, cyg_uint32 __len)
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141 {
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142 while(__len-- > 0)
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143 *__buf++ = cyg_hal_plf_serial_getc(__ch_data);
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144 }
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145
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146
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147 cyg_bool
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148 cyg_hal_plf_serial_getc_timeout(void* __ch_data, cyg_uint8* ch)
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149 {
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150 int delay_count;
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151 channel_data_t* chan;
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152 cyg_bool res;
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153
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154 // Some of the diagnostic print code calls through here with no idea what the ch_data is.
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155 // Go ahead and assume it is channels[0].
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156 if (__ch_data == 0)
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157 __ch_data = (void*)&channels[0];
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158
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159 chan = (channel_data_t*)__ch_data;
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160
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161 delay_count = chan->msec_timeout * 10; // delay in .1 ms steps
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162
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163 for(;;) {
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164 res = cyg_hal_plf_serial_getc_nonblock(__ch_data, ch);
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165 if (res || 0 == delay_count--)
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166 break;
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167 CYGACC_CALL_IF_DELAY_US(100);
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168 }
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169
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170 return res;
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171 }
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172
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173 static int
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174 cyg_hal_plf_serial_control(void *__ch_data, __comm_control_cmd_t __func, ...)
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175 {
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176 static int irq_state = 0;
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177 channel_data_t* chan;
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178 int ret = 0;
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179
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180 // Some of the diagnostic print code calls through here with no idea what the ch_data is.
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181 // Go ahead and assume it is channels[0].
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182 if (__ch_data == 0)
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183 __ch_data = (void*)&channels[0];
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184
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185 chan = (channel_data_t*)__ch_data;
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186
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187 switch (__func) {
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188 case __COMMCTL_IRQ_ENABLE:
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189 irq_state = 1;
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190
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191 HAL_INTERRUPT_SET_LEVEL(chan->isr_vector, 1);
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192 HAL_INTERRUPT_UNMASK(chan->isr_vector);
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193 break;
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194 case __COMMCTL_IRQ_DISABLE:
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195 ret = irq_state;
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196 irq_state = 0;
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197
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198 HAL_INTERRUPT_MASK(chan->isr_vector);
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199 break;
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200 case __COMMCTL_DBG_ISR_VECTOR:
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201 ret = chan->isr_vector;
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202 break;
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203 case __COMMCTL_SET_TIMEOUT:
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204 {
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205 va_list ap;
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206
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207 va_start(ap, __func);
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208
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209 ret = chan->msec_timeout;
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210 chan->msec_timeout = va_arg(ap, cyg_uint32);
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211
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212 va_end(ap);
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213 }
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214 break;
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215 case __COMMCTL_SETBAUD:
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216 {
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217 cyg_uint32 baud_rate;
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218 va_list ap;
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219
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220 va_start(ap, __func);
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221 baud_rate = va_arg(ap, cyg_uint32);
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222 va_end(ap);
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223
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224 switch (baud_rate)
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225 {
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226 case 57600: break;
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227 default: return -1;
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228 }
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229 }
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230 break;
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231
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232 case __COMMCTL_GETBAUD:
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233 break;
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234 default:
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235 break;
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236 }
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237 return ret;
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238 }
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239
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240 static int
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241 cyg_hal_plf_serial_isr(void *__ch_data, int* __ctrlc,
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242 CYG_ADDRWORD __vector, CYG_ADDRWORD __data)
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243 {
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244 *__ctrlc = 0;
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245 return 0;
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246 }
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247
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248 static void
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249 cyg_hal_plf_serial_init(void)
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250 {
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251 hal_virtual_comm_table_t* comm;
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252 int cur = CYGACC_CALL_IF_SET_CONSOLE_COMM(CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT);
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253
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254 // Disable interrupts.
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255 HAL_INTERRUPT_MASK(channels[0].isr_vector);
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256
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257 // Init channels
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258 cyg_hal_plf_serial_init_channel((void*)&channels[0]);
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259
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260 // Setup procs in the vector table
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261
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262 // Set channel 0
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263 CYGACC_CALL_IF_SET_CONSOLE_COMM(0);
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264 comm = CYGACC_CALL_IF_CONSOLE_PROCS();
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265 CYGACC_COMM_IF_CH_DATA_SET(*comm, &channels[0]);
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266 CYGACC_COMM_IF_WRITE_SET(*comm, cyg_hal_plf_serial_write);
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267 CYGACC_COMM_IF_READ_SET(*comm, cyg_hal_plf_serial_read);
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268 CYGACC_COMM_IF_PUTC_SET(*comm, cyg_hal_plf_serial_putc);
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269 CYGACC_COMM_IF_GETC_SET(*comm, cyg_hal_plf_serial_getc);
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270 CYGACC_COMM_IF_CONTROL_SET(*comm, cyg_hal_plf_serial_control);
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271 CYGACC_COMM_IF_DBG_ISR_SET(*comm, cyg_hal_plf_serial_isr);
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272 CYGACC_COMM_IF_GETC_TIMEOUT_SET(*comm, cyg_hal_plf_serial_getc_timeout);
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273
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274 // Restore original console
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275 CYGACC_CALL_IF_SET_CONSOLE_COMM(cur);
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276 }
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277
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278 void
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279 cyg_hal_plf_comms_init(void)
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280 {
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281 static int initialized = 0;
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282
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283 if (initialized)
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284 return;
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285
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286 initialized = 1;
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287
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288 cyg_hal_plf_serial_init();
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289 }
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290
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291 //-----------------------------------------------------------------------------
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292 // end of ser16c550c.c
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293