Tue, 26 Sep 2023 14:57:18 +0200
Migrated to isp-idf v5.1
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1 | /* |
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2 | * MIT License |
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3 | * |
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4 | * Copyright (c) 2017 David Antliff |
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5 | * Copyright (c) 2017 Chris Morgan <chmorgan@gmail.com> |
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6 | * |
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7 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
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8 | * of this software and associated documentation files (the "Software"), to deal |
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9 | * in the Software without restriction, including without limitation the rights |
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10 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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11 | * copies of the Software, and to permit persons to whom the Software is |
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12 | * furnished to do so, subject to the following conditions: |
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13 | * |
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14 | * The above copyright notice and this permission notice shall be included in all |
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15 | * copies or substantial portions of the Software. |
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16 | * |
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17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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18 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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20 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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21 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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23 | * SOFTWARE. |
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24 | */ |
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25 | |
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26 | /** |
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27 | * @file |
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28 | */ |
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29 | |
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30 | #include <stddef.h> |
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31 | #include <stdbool.h> |
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32 | #include <inttypes.h> |
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33 | #include <string.h> |
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34 | #include <stdlib.h> |
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35 | |
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36 | #include "freertos/FreeRTOS.h" |
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37 | #include "freertos/task.h" |
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38 | #include "esp_log.h" |
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39 | #include "sdkconfig.h" |
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40 | #include "driver/gpio.h" |
72 | 41 | #include "rom/ets_sys.h" // for ets_delay_us() |
42 | #include "rom/gpio.h" // for gpio_pad_select_gpio() | |
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43 | |
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44 | #include "owb.h" |
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45 | #include "owb_gpio.h" |
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46 | |
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47 | static const char * TAG = "owb_gpio"; |
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48 | |
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49 | // Define PHY_DEBUG to enable GPIO output around when the bus is sampled |
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50 | // by the master (this library). This GPIO output makes it possible to |
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51 | // validate the master's sampling using an oscilloscope. |
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52 | // |
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53 | // For the debug GPIO the idle state is low and made high before the 1-wire sample |
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54 | // point and low again after the sample point |
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55 | #undef PHY_DEBUG |
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56 | |
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57 | #ifdef PHY_DEBUG |
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58 | // Update these defines to a pin that you can access |
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59 | #define PHY_DEBUG_GPIO GPIO_NUM_27 |
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60 | #define PHY_DEBUG_GPIO_MASK GPIO_SEL_27 |
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61 | #endif |
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62 | |
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63 | /// @cond ignore |
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64 | struct _OneWireBus_Timing |
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65 | { |
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66 | uint32_t A, B, C, D, E, F, G, H, I, J; |
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67 | }; |
72 | 68 | /// @endcond |
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69 | |
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70 | // 1-Wire timing delays (standard) in microseconds. |
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71 | // Labels and values are from https://www.maximintegrated.com/en/app-notes/index.mvp/id/126 |
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72 | static const struct _OneWireBus_Timing _StandardTiming = { |
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73 | 6, // A - read/write "1" master pull DQ low duration |
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74 | 64, // B - write "0" master pull DQ low duration |
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75 | 60, // C - write "1" master pull DQ high duration |
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76 | 10, // D - write "0" master pull DQ high duration |
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77 | 9, // E - read master pull DQ high duration |
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78 | 55, // F - complete read timeslot + 10ms recovery |
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79 | 0, // G - wait before reset |
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80 | 480, // H - master pull DQ low duration |
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81 | 70, // I - master pull DQ high duration |
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82 | 410, // J - complete presence timeslot + recovery |
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83 | }; |
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84 | |
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85 | static void _us_delay(uint32_t time_us) |
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86 | { |
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87 | ets_delay_us(time_us); |
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88 | } |
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89 | |
72 | 90 | /// @cond ignore |
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91 | #define info_from_bus(owb) container_of(owb, owb_gpio_driver_info, bus) |
72 | 92 | /// @endcond |
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93 | |
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94 | /** |
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95 | * @brief Generate a 1-Wire reset (initialization). |
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96 | * @param[in] bus Initialised bus instance. |
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97 | * @param[out] is_present true if device is present, otherwise false. |
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98 | * @return status |
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99 | */ |
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100 | static owb_status _reset(const OneWireBus * bus, bool * is_present) |
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101 | { |
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102 | bool present = false; |
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103 | portMUX_TYPE timeCriticalMutex = portMUX_INITIALIZER_UNLOCKED; |
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104 | portENTER_CRITICAL(&timeCriticalMutex); |
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105 | |
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106 | owb_gpio_driver_info *i = info_from_bus(bus); |
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107 | |
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108 | gpio_set_direction(i->gpio, GPIO_MODE_OUTPUT); |
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109 | _us_delay(bus->timing->G); |
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110 | gpio_set_level(i->gpio, 0); // Drive DQ low |
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111 | _us_delay(bus->timing->H); |
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112 | gpio_set_direction(i->gpio, GPIO_MODE_INPUT); // Release the bus |
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113 | gpio_set_level(i->gpio, 1); // Reset the output level for the next output |
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114 | _us_delay(bus->timing->I); |
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115 | |
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116 | #ifdef PHY_DEBUG |
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117 | gpio_set_level(PHY_DEBUG_GPIO, 1); |
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118 | #endif |
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119 | |
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120 | int level1 = gpio_get_level(i->gpio); |
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121 | |
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122 | #ifdef PHY_DEBUG |
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123 | gpio_set_level(PHY_DEBUG_GPIO, 0); |
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124 | #endif |
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125 | |
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126 | _us_delay(bus->timing->J); // Complete the reset sequence recovery |
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127 | |
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128 | #ifdef PHY_DEBUG |
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129 | gpio_set_level(PHY_DEBUG_GPIO, 1); |
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130 | #endif |
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131 | |
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132 | int level2 = gpio_get_level(i->gpio); |
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133 | |
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134 | #ifdef PHY_DEBUG |
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135 | gpio_set_level(PHY_DEBUG_GPIO, 0); |
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136 | #endif |
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137 | |
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138 | portEXIT_CRITICAL(&timeCriticalMutex); |
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139 | |
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140 | present = (level1 == 0) && (level2 == 1); // Sample for presence pulse from slave |
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141 | ESP_LOGD(TAG, "reset: level1 0x%x, level2 0x%x, present %d", level1, level2, present); |
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142 | |
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143 | *is_present = present; |
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144 | |
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145 | return OWB_STATUS_OK; |
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146 | } |
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147 | |
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148 | /** |
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149 | * @brief Send a 1-Wire write bit, with recovery time. |
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150 | * @param[in] bus Initialised bus instance. |
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151 | * @param[in] bit The value to send. |
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152 | */ |
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153 | static void _write_bit(const OneWireBus * bus, int bit) |
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154 | { |
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155 | int delay1 = bit ? bus->timing->A : bus->timing->C; |
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156 | int delay2 = bit ? bus->timing->B : bus->timing->D; |
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157 | owb_gpio_driver_info *i = info_from_bus(bus); |
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158 | |
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159 | portMUX_TYPE timeCriticalMutex = portMUX_INITIALIZER_UNLOCKED; |
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160 | portENTER_CRITICAL(&timeCriticalMutex); |
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161 | |
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162 | gpio_set_direction(i->gpio, GPIO_MODE_OUTPUT); |
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163 | gpio_set_level(i->gpio, 0); // Drive DQ low |
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164 | _us_delay(delay1); |
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165 | gpio_set_level(i->gpio, 1); // Release the bus |
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166 | _us_delay(delay2); |
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167 | |
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168 | portEXIT_CRITICAL(&timeCriticalMutex); |
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169 | } |
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170 | |
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171 | /** |
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172 | * @brief Read a bit from the 1-Wire bus and return the value, with recovery time. |
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173 | * @param[in] bus Initialised bus instance. |
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174 | */ |
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175 | static int _read_bit(const OneWireBus * bus) |
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176 | { |
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177 | int result = 0; |
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178 | owb_gpio_driver_info *i = info_from_bus(bus); |
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179 | |
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180 | portMUX_TYPE timeCriticalMutex = portMUX_INITIALIZER_UNLOCKED; |
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181 | portENTER_CRITICAL(&timeCriticalMutex); |
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182 | |
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183 | gpio_set_direction(i->gpio, GPIO_MODE_OUTPUT); |
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184 | gpio_set_level(i->gpio, 0); // Drive DQ low |
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185 | _us_delay(bus->timing->A); |
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186 | gpio_set_direction(i->gpio, GPIO_MODE_INPUT); // Release the bus |
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187 | gpio_set_level(i->gpio, 1); // Reset the output level for the next output |
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188 | _us_delay(bus->timing->E); |
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189 | |
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190 | #ifdef PHY_DEBUG |
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191 | gpio_set_level(PHY_DEBUG_GPIO, 1); |
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192 | #endif |
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193 | |
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194 | int level = gpio_get_level(i->gpio); |
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195 | |
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196 | #ifdef PHY_DEBUG |
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197 | gpio_set_level(PHY_DEBUG_GPIO, 0); |
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198 | #endif |
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199 | |
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200 | _us_delay(bus->timing->F); // Complete the timeslot and 10us recovery |
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201 | |
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202 | portEXIT_CRITICAL(&timeCriticalMutex); |
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203 | |
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204 | result = level & 0x01; |
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205 | |
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206 | return result; |
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207 | } |
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208 | |
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209 | /** |
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210 | * @brief Write 1-Wire data byte. |
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211 | * NOTE: The data is shifted out of the low bits, eg. it is written in the order of lsb to msb |
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212 | * @param[in] bus Initialised bus instance. |
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213 | * @param[in] data Value to write. |
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214 | * @param[in] number_of_bits_to_read bits to write |
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215 | */ |
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216 | static owb_status _write_bits(const OneWireBus * bus, uint8_t data, int number_of_bits_to_write) |
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217 | { |
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218 | ESP_LOGD(TAG, "write 0x%02x", data); |
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219 | for (int i = 0; i < number_of_bits_to_write; ++i) |
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220 | { |
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221 | _write_bit(bus, data & 0x01); |
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222 | data >>= 1; |
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223 | } |
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224 | |
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225 | return OWB_STATUS_OK; |
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226 | } |
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227 | |
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228 | /** |
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229 | * @brief Read 1-Wire data byte from bus. |
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230 | * NOTE: Data is read into the high bits, eg. each bit read is shifted down before the next bit is read |
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231 | * @param[in] bus Initialised bus instance. |
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232 | * @return Byte value read from bus. |
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233 | */ |
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234 | static owb_status _read_bits(const OneWireBus * bus, uint8_t *out, int number_of_bits_to_read) |
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235 | { |
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236 | uint8_t result = 0; |
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237 | for (int i = 0; i < number_of_bits_to_read; ++i) |
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238 | { |
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239 | result >>= 1; |
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240 | if (_read_bit(bus)) |
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241 | { |
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242 | result |= 0x80; |
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243 | } |
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244 | } |
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245 | ESP_LOGD(TAG, "read 0x%02x", result); |
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246 | *out = result; |
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247 | |
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248 | return OWB_STATUS_OK; |
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249 | } |
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250 | |
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251 | static owb_status _uninitialize(const OneWireBus * bus) |
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252 | { |
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253 | // Nothing to do here for this driver_info |
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254 | return OWB_STATUS_OK; |
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255 | } |
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256 | |
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257 | static const struct owb_driver gpio_function_table = |
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258 | { |
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259 | .name = "owb_gpio", |
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260 | .uninitialize = _uninitialize, |
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261 | .reset = _reset, |
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262 | .write_bits = _write_bits, |
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263 | .read_bits = _read_bits |
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264 | }; |
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265 | |
72 | 266 | OneWireBus* owb_gpio_initialize(owb_gpio_driver_info * driver_info, int gpio) |
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267 | { |
72 | 268 | ESP_LOGD(TAG, "%s(): gpio %d\n", __func__, gpio); |
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269 | |
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270 | driver_info->gpio = gpio; |
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271 | driver_info->bus.driver = &gpio_function_table; |
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272 | driver_info->bus.timing = &_StandardTiming; |
72 | 273 | driver_info->bus.strong_pullup_gpio = GPIO_NUM_NC; |
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274 | |
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275 | // platform specific: |
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276 | gpio_pad_select_gpio(driver_info->gpio); |
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277 | |
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278 | #ifdef PHY_DEBUG |
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279 | gpio_config_t io_conf; |
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280 | io_conf.intr_type = GPIO_INTR_DISABLE; |
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281 | io_conf.mode = GPIO_MODE_OUTPUT; |
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282 | io_conf.pin_bit_mask = PHY_DEBUG_GPIO_MASK; |
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283 | io_conf.pull_down_en = GPIO_PULLDOWN_ENABLE; |
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284 | io_conf.pull_up_en = GPIO_PULLUP_DISABLE; |
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285 | ESP_ERROR_CHECK(gpio_config(&io_conf)); |
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286 | #endif |
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287 | |
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288 | return &(driver_info->bus); |
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289 | } |