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annotate gsm-fw/L1/cfile/tch_feature.c @ 1034:405b5469abc4 default tip

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author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 12 Jun 2016 19:06:34 +0000
parents 6e7dd5e52650
children
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1 /*
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2 * This module is a FreeCalypso addition; it contains code implementing
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3 * our custom voice TCH rerouting feature.
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4 */
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5
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6 #include "config.h"
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7 #include "l1_confg.h"
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8 #include "l1_types.h"
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9 #include "sys_types.h"
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10 #include <string.h>
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11 #include "l1_const.h"
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12 #include "l1_defty.h"
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13 #include "l1_varex.h"
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14 #include "l1_trace.h"
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15 #include "tch_feature.h"
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16
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17 T_RVT_USER_ID tch_reroute_rvt_id;
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18 BOOL tch_reroute_downlink;
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19
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20 void tch_send_downlink_bits(API *dsp_buffer)
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21 {
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22 T_RVT_BUFFER buf;
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23 T_RVT_RET rc;
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24 UINT8 *dp;
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25 UWORD16 apiword;
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26 int i;
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27
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28 rc = rvt_mem_alloc(tch_reroute_rvt_id, 41, &buf);
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29 if (rc != RVT_OK)
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30 return;
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31 dp = buf;
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32 *dp++ = TCH_DLBITS_IND;
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33 for (i = 0; i < 20; i++) {
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34 apiword = dsp_buffer[i];
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35 *dp++ = apiword >> 8;
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36 *dp++ = apiword;
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37 }
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38 rvt_send_trace_no_cpy(buf, tch_reroute_rvt_id, 41, RVT_BINARY_FORMAT);
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39 }
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40
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41 static void send_tch_ulbits_conf()
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42 {
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43 T_RVT_BUFFER buf;
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44 T_RVT_RET rc;
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45
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46 rc = rvt_mem_alloc(tch_reroute_rvt_id, 1, &buf);
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47 if (rc == RVT_OK) {
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48 buf[0] = TCH_ULBITS_CONF;
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49 rvt_send_trace_no_cpy(buf, tch_reroute_rvt_id, 1,
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50 RVT_BINARY_FORMAT);
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51 }
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52 }
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53
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54 #define UPLINK_QUEUE_SIZE 5
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55 #define WORDS_PER_ENTRY 17
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56
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57 static UWORD16 uplink_data[UPLINK_QUEUE_SIZE][WORDS_PER_ENTRY];
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58 static volatile int ul_read_ptr, ul_write_ptr;
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59
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60 void tch_substitute_uplink(API *dsp_buffer)
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61 {
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62 int read_ptr;
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63 int i;
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64
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65 read_ptr = ul_read_ptr;
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66 if (read_ptr == ul_write_ptr) {
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67 /* no uplink substitution */
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68 l1s_dsp_com.dsp_ndb_ptr->d_tch_mode &= ~B_PLAY_UL;
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69 return;
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70 }
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71 for (i = 0; i < WORDS_PER_ENTRY; i++)
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72 dsp_buffer[i+3] = uplink_data[read_ptr][i];
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73 // Fill data block Header...
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74 dsp_buffer[0] = (1 << B_BLUD); // 1st word: Set B_BLU bit.
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75 dsp_buffer[1] = 0; // 2nd word: cleared.
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76 dsp_buffer[2] = 0; // 3rd word: cleared.
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77 l1s_dsp_com.dsp_ndb_ptr->d_tch_mode |= B_PLAY_UL;
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78 /* advance the read pointer and send TCH_ULBITS_CONF */
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79 read_ptr++;
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80 if (read_ptr >= UPLINK_QUEUE_SIZE)
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81 read_ptr = 0;
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82 ul_read_ptr = read_ptr;
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83 send_tch_ulbits_conf();
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84 }
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85
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86 static void handle_tch_ulbits_req(T_RVT_BUFFER pkt)
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87 {
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88 int write_ptr, write_next, i;
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89 UINT8 *sp;
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90
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91 write_ptr = ul_write_ptr;
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92 write_next = write_ptr + 1;
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93 if (write_next >= UPLINK_QUEUE_SIZE)
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94 write_next = 0;
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95 if (write_next == ul_read_ptr) /* queue full */
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96 return;
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97 sp = pkt + 1;
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98 for (i = 0; i < WORDS_PER_ENTRY; i++) {
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99 uplink_data[write_ptr][i] = (sp[0] << 8) | sp[1];
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100 sp += 2;
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101 }
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102 ul_write_ptr = write_next;
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103 }
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104
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105 static void handle_tch_config_req(T_RVT_BUFFER pkt)
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106 {
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107 UWORD8 config;
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108 T_RVT_BUFFER buf;
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109 T_RVT_RET rc;
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110
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111 config = pkt[1] & 0x01;
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112 tch_reroute_downlink = config;
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113
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114 /* send TCH_CONFIG_CONF response */
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115 rc = rvt_mem_alloc(tch_reroute_rvt_id, 2, &buf);
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116 if (rc == RVT_OK) {
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117 buf[0] = TCH_CONFIG_CONF;
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118 buf[1] = config;
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119 rvt_send_trace_no_cpy(buf, tch_reroute_rvt_id, 2,
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120 RVT_BINARY_FORMAT);
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121 }
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122 }
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123
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124 /*
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125 * The following function is the callback registered with RVT; it gets
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126 * called in RVT HISR context.
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127 */
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128 static void tch_rvt_input_callback(T_RVT_BUFFER pkt, UINT16 pktlen)
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129 {
1005
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130 if (pktlen < 1)
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131 return;
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132 switch (pkt[0]) {
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133 case TCH_CONFIG_REQ:
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134 if (pktlen != 2)
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135 return;
1016
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136 handle_tch_config_req(pkt);
1005
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137 break;
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138 case TCH_ULBITS_REQ:
1016
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139 if (pktlen < 34)
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140 return;
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141 handle_tch_ulbits_req(pkt);
1005
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142 break;
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143 }
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144 }
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145
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146 void feature_tch_reroute_init()
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147 {
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148 rvt_register_id("TCH", &tch_reroute_rvt_id, tch_rvt_input_callback);
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149 tch_reroute_downlink = FALSE;
1016
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150 ul_read_ptr = 0;
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151 ul_write_ptr = 0;
1003
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152 }