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annotate hid-usb-to-ir.c @ 0:c6e3b362f9cf v0.2

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author Peter Meerwald <p.meerwald@bct-electronic.com>
date Thu, 03 Jan 2013 13:08:39 +0100
parents
children 95b8b8a0b2d0
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0
Peter Meerwald <p.meerwald@bct-electronic.com>
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1 /*
Peter Meerwald <p.meerwald@bct-electronic.com>
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2 * Demo program for the Silabs IR Gesture USB Reference Design,
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3 * http://www.silabs.com/products/sensors/Pages/HID-USB-to-IR-Reference-Design.aspx
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4 *
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5 * Reads the part number of the cp2112 bridge,
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6 * http://www.silabs.com/products/interface/usbtouart/Pages/HID-USB-to-SMBus-Bridge.aspx,
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7 * and the part/revision/sequencer version of the si1143 via SMBus/I2C,
Peter Meerwald <p.meerwald@bct-electronic.com>
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8 * finally lets the four blue LEDs dance :).
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9 *
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10 * Copyright (c) 2012 Peter Meerwald, <pmeerw@pmeerw.net>
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11 * Released under GPLv3 license, see http://www.gnu.org/licenses/gpl-3.0.html.
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12 *
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13 * Depends on the HID API multi-platform library, available from
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14 * http://www.signal11.us/oss/hidapi/.
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15 *
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16 * Build with
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17 * gcc -Wall -g -o hid-usb-to-ir hid-usb-to-ir.c `pkg-config hidapi-hidraw --libs`
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18 *
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19 * May need root permission to access USB device (or appropriate udev rule).
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20 *
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21 * Based upon information from Silabs AN495 v0.2.
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22 */
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23
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24 #include <stdio.h>
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25 #include <stdlib.h>
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26 #include <string.h>
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27 #include <unistd.h>
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28 #include "hidapi/hidapi.h"
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29
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30 #define SI114X_SLAVE_ADDR 0x5a
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31 #define SI114X_HWKEY 0x07
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32 #define SI114x_PART_ID 0x00
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33 #define SI114x_REV_ID 0x01
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34 #define SI114x_SEQ_ID 0x02
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35
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36 #define CP2112_GETSET_GPIO_CONFIG 0x02
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37 #define CP2112_GET_GPIO 0x03
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38 #define CP2112_SET_GPIO 0x04
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39 #define CP2122_GET_VERSION_INFO 0x05
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40 #define CP2112_GETSET_SMBUS_CONFIG 0x06
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41 #define CP2112_DATA_WRITE_READ_REQ 0x11
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42 #define CP2112_DATA_READ_RESP 0x13
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43 #define CP2112_DATA_WRITE 0x14
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44 #define CP2112_TRANSFER_STATUS_REQ 0x15
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45 #define CP2112_TRANSFER_STATUS_RESP 0x16
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46
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47 #define CP2112_LED_DOWN 0x01 /* LED DS2, GPIO 0 */
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48 #define CP2112_LED_UP 0x02 /* LED DS3, GPIO 1 */
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49 #define CP2112_LED_RIGHT 0x08 /* LED DS8, GPIO 3 */
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50 #define CP2112_LED_LEFT 0x80 /* LED DS4, GPIO 7 */
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51 #define CP2112_LEDS_MASK (CP2112_LED_DOWN | CP2112_LED_UP | \
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52 CP2112_LED_RIGHT | CP2112_LED_LEFT)
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53
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54 /* get cp2112 part number and version */
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55 static int cp2112_get_version(hid_device *hd, unsigned char data[2]) {
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56 unsigned char buf[3] = { CP2122_GET_VERSION_INFO, };
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57
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58 int ret = hid_get_feature_report(hd, buf, sizeof(buf));
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59 if (ret < 0) {
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60 fprintf(stderr, "hid_get_feature_report() failed: %ls\n",
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61 hid_error(hd));
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62 return -1;
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63 }
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64
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65 data[0] = buf[1]; /* part number */
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66 data[1] = buf[2]; /* version */
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67
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68 return 0;
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69 }
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70
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71 /* configures cp2112 to automatically send read data, see AN495 section 4.6 */
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72 static int cp2112_set_auto_send_read(hid_device *hd, int on_off) {
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73 unsigned char buf[14] = { CP2112_GETSET_SMBUS_CONFIG, };
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74 int ret = hid_get_feature_report(hd, buf, sizeof(buf));
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75 if (ret < 0) {
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76 fprintf(stderr, "hid_get_feature_report() failed: %ls\n",
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77 hid_error(hd));
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78 return -1;
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79 }
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80
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81 buf[6] = on_off;
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82
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83 ret = hid_send_feature_report(hd, buf, sizeof(buf));
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84 if (ret < 0) {
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85 fprintf(stderr, "hid_send_feature_report() failed: %ls\n",
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86 hid_error(hd));
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87 return -1;
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88 }
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89
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90 return 0;
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91 }
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92
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93 /* see if the cp2112 is idle */
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94 static int cp2112_is_idle(hid_device *hd) {
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95 unsigned char status_req[2] = { CP2112_TRANSFER_STATUS_REQ, 0x01, };
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96 if (hid_write(hd, status_req, sizeof(status_req)) < 0) {
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97 fprintf(stderr, "hid_write() failed: %ls\n",
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98 hid_error(hd));
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99 return -1;
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100 }
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101
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102 unsigned char status_resp[7] = { 0x00, };
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103 if (hid_read(hd, status_resp, sizeof(status_resp)) < 0) {
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104 fprintf(stderr, "hid_read() failed: %ls\n",
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105 hid_error(hd));
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106 return -1;
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107 }
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108
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109 if (status_resp[0] == CP2112_TRANSFER_STATUS_RESP) {
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110 if (status_resp[1] == 0x00) /* is idle? */
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111 return 1;
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112 }
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113
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114 return 0;
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115 }
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116
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117 /* write a data byte to register reg of the si1143 */
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118 static int cp2112_write_byte(hid_device *hd, unsigned char reg, unsigned char data) {
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119 /* 0x5a is the 7-bit SMBus slave address of the si1143 */
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120 unsigned char buf_out[5] = { CP2112_DATA_WRITE, SI114X_SLAVE_ADDR<<1, 0x02, };
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121 buf_out[3] = reg;
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122 buf_out[4] = data;
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123 int ret = hid_write(hd, buf_out, sizeof(buf_out));
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124 if (ret < 0) {
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125 fprintf(stderr, "hid_write() failed: %ls\n",
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126 hid_error(hd));
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127 return -1;
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128 }
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129
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130 return 0;
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131 }
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132
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133 /* read a data byte from register reg of the si1143 */
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134 static int cp2112_read_byte(hid_device *hd, unsigned char reg, unsigned char data[1]) {
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135 /* 0x5a is the 7-bit SMBus slave address of the si1143 */
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136 unsigned char buf_out[6] = { CP2112_DATA_WRITE_READ_REQ,
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137 SI114X_SLAVE_ADDR<<1, 0x00, 0x01, 0x01, };
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138 buf_out[5] = reg;
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139 int ret = hid_write(hd, buf_out, sizeof(buf_out));
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140 if (ret < 0) {
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141 fprintf(stderr, "hid_write() failed: %ls\n",
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142 hid_error(hd));
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143 return -1;
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144 }
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145
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146 /* FIXME: may loop forever, error handling needed */
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147 while (1) {
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148
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149 unsigned char buf_in[8] = { 0x00, };
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150 ret = hid_read(hd, buf_in, sizeof(buf_in));
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151 if (ret < 0) {
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152 fprintf(stderr, "hid_read_() failed: %ls\n",
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153 hid_error(hd));
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154 return -1;
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155 }
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156
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157
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158 if (buf_in[0] == CP2112_TRANSFER_STATUS_REQ)
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159 continue;
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160
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161 if (buf_in[0] == CP2112_DATA_READ_RESP) {
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162 if (buf_in[1] == 0x02 && buf_in[2] == 0x00)
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163 continue; /* no data yet */
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164 if (buf_in[1] == 0x02 && buf_in[2] == 0x01) {
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165 data[0] = buf_in[3]; /* data available */
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166 return 0;
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167 }
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168 }
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169 }
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170
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171 return -1;
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172 }
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173
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174 /* configure cp2112 GPIO pins */
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175 static int cp2112_config_gpio(hid_device *hd) {
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176 unsigned char buf[5] = { CP2112_GETSET_GPIO_CONFIG, };
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177 int ret = hid_get_feature_report(hd, buf, sizeof(buf));
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178 if (ret < 0) {
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179 fprintf(stderr, "hid_get_feature_report() failed: %ls\n",
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180 hid_error(hd));
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181 return -1;
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182 }
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183
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184 buf[1] = 0x8b; /* output direction for GPIOs 0, 1, 3, 7 */
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185 buf[2] = 0x8b; /* push-pull for GPIOs 0, 1, 3, 7 */
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186 buf[3] = 0x00; /* no special functions, i.e. use pins as GPIO */
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187
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188 ret = hid_send_feature_report(hd, buf, sizeof(buf));
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189 if (ret < 0) {
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
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190 fprintf(stderr, "hid_send_feature_report() failed: %ls\n",
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
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191 hid_error(hd));
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
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192 return -1;
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
193 }
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
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194
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
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195 return 0;
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
196 }
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
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197
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
198 /* set cp2112 GPIO pins */
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
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199 static int cp2112_set_gpio(hid_device *hd, unsigned char mask, unsigned char value) {
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
200 unsigned char buf[3] = { CP2112_SET_GPIO, };
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
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201
Peter Meerwald <p.meerwald@bct-electronic.com>
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202 buf[1] = ~value; /* set GPIO pins: 0 .. turn LED on, 1 .. off */
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
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203 buf[2] = mask; /* mask of pins to set, ignore others */
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
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204
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
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205 int ret = hid_send_feature_report(hd, buf, sizeof(buf));
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
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206 if (ret < 0) {
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
207 fprintf(stderr, "hid_send_feature_report() failed: %ls\n",
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
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208 hid_error(hd));
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
209 return -1;
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
210 }
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
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211
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
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212 return 0;
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
213 }
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
214
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
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215 int main() {
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
216 if (hid_init() < 0) {
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
217 fprintf(stderr, "hid_init() failed, exit.\n");
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
218 exit(EXIT_FAILURE);
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
219 }
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
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220
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
221 /* open Silabs IR Gesture USB reference design by USB product:vendor id */
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
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222 hid_device *hd = hid_open(0x10c4, 0xea90, NULL);
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
223 if (hd == NULL) {
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
224 fprintf(stderr, "hid_open() failed\n");
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
225 exit(EXIT_FAILURE);
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
226 }
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
227
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
228 unsigned char version_data[2];
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
229 if (cp2112_get_version(hd, version_data) < 0)
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
230 exit(EXIT_FAILURE);
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
231 printf("cp2112 part number 0x%02x, device version %d\n",
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
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232 version_data[0], version_data[1]);
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
233
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
234 if (cp2112_set_auto_send_read(hd, 1) < 0)
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
235 exit(EXIT_FAILURE);
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
236
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
237 /* write 0x17 to si114x HW_KEY register as per datasheet */
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
238 if (cp2112_write_byte(hd, SI114X_HWKEY, 0x17) < 0)
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
239 exit(EXIT_FAILURE);
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
240
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
241 unsigned char part, rev, seq;
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
242 if (cp2112_read_byte(hd, SI114x_PART_ID, &part) < 0)
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
243 exit(EXIT_FAILURE);
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
244
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
245 if (cp2112_read_byte(hd, SI114x_REV_ID, &rev) < 0)
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
246 exit(EXIT_FAILURE);
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
247
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
248 if (cp2112_read_byte(hd, SI114x_SEQ_ID, &seq) < 0)
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
249 exit(EXIT_FAILURE);
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
250 printf("si114x part number 0x%02x, revision 0x%02x, sequencer 0x%02x\n",
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
251 part, rev, seq);
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
252
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
253 cp2112_is_idle(hd);
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
254
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
255 if (cp2112_config_gpio(hd) < 0)
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
256 exit(EXIT_FAILURE);
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
257
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
258 while (1) {
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
259 if (cp2112_set_gpio(hd, CP2112_LEDS_MASK, CP2112_LED_DOWN) < 0)
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
260 exit(EXIT_FAILURE);
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
261 usleep(50*1000);
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
262 if (cp2112_set_gpio(hd, CP2112_LEDS_MASK, CP2112_LED_RIGHT) < 0)
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
263 exit(EXIT_FAILURE);
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
264 usleep(50*1000);
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
265 if (cp2112_set_gpio(hd, CP2112_LEDS_MASK, CP2112_LED_UP) < 0)
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
266 exit(EXIT_FAILURE);
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
267 usleep(50*1000);
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
268 if (cp2112_set_gpio(hd, CP2112_LEDS_MASK, CP2112_LED_LEFT) < 0)
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
269 exit(EXIT_FAILURE);
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
270 usleep(50*1000);
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
271 }
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
272
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
273 /* never get here */
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
274 printf("done\n");
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
275
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
276 hid_close(hd);
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
277 hid_exit();
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
278
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
279 return EXIT_SUCCESS;
Peter Meerwald <p.meerwald@bct-electronic.com>
parents:
diff changeset
280 }

Repositories maintained by Peter Meerwald, pmeerw@pmeerw.net.