1 | /** |
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2 | ****************************************************************************** |
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3 | * @file stm32g0xx_ll_i2c.c |
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4 | * @author MCD Application Team |
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5 | * @brief I2C LL module driver. |
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6 | ****************************************************************************** |
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7 | * @attention |
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8 | * |
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9 | * <h2><center>© Copyright (c) 2018 STMicroelectronics. |
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10 | * All rights reserved.</center></h2> |
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11 | * |
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12 | * This software component is licensed by ST under BSD 3-Clause license, |
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13 | * the "License"; You may not use this file except in compliance with the |
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14 | * License. You may obtain a copy of the License at: |
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15 | * opensource.org/licenses/BSD-3-Clause |
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16 | * |
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17 | ****************************************************************************** |
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18 | */ |
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19 | #if defined(USE_FULL_LL_DRIVER) |
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20 | |
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21 | /* Includes ------------------------------------------------------------------*/ |
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22 | #include "stm32g0xx_ll_i2c.h" |
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23 | #include "stm32g0xx_ll_bus.h" |
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24 | #ifdef USE_FULL_ASSERT |
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25 | #include "stm32_assert.h" |
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26 | #else |
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27 | #define assert_param(expr) ((void)0U) |
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28 | #endif |
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29 | |
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30 | /** @addtogroup STM32G0xx_LL_Driver |
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31 | * @{ |
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32 | */ |
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33 | |
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34 | #if defined (I2C1) || defined (I2C2) |
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35 | |
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36 | /** @defgroup I2C_LL I2C |
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37 | * @{ |
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38 | */ |
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39 | |
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40 | /* Private types -------------------------------------------------------------*/ |
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41 | /* Private variables ---------------------------------------------------------*/ |
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42 | /* Private constants ---------------------------------------------------------*/ |
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43 | /* Private macros ------------------------------------------------------------*/ |
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44 | /** @addtogroup I2C_LL_Private_Macros |
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45 | * @{ |
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46 | */ |
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47 | |
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48 | #define IS_LL_I2C_PERIPHERAL_MODE(__VALUE__) (((__VALUE__) == LL_I2C_MODE_I2C) || \ |
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49 | ((__VALUE__) == LL_I2C_MODE_SMBUS_HOST) || \ |
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50 | ((__VALUE__) == LL_I2C_MODE_SMBUS_DEVICE) || \ |
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51 | ((__VALUE__) == LL_I2C_MODE_SMBUS_DEVICE_ARP)) |
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52 | |
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53 | #define IS_LL_I2C_ANALOG_FILTER(__VALUE__) (((__VALUE__) == LL_I2C_ANALOGFILTER_ENABLE) || \ |
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54 | ((__VALUE__) == LL_I2C_ANALOGFILTER_DISABLE)) |
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55 | |
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56 | #define IS_LL_I2C_DIGITAL_FILTER(__VALUE__) ((__VALUE__) <= 0x0000000FU) |
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57 | |
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58 | #define IS_LL_I2C_OWN_ADDRESS1(__VALUE__) ((__VALUE__) <= 0x000003FFU) |
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59 | |
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60 | #define IS_LL_I2C_TYPE_ACKNOWLEDGE(__VALUE__) (((__VALUE__) == LL_I2C_ACK) || \ |
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61 | ((__VALUE__) == LL_I2C_NACK)) |
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62 | |
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63 | #define IS_LL_I2C_OWN_ADDRSIZE(__VALUE__) (((__VALUE__) == LL_I2C_OWNADDRESS1_7BIT) || \ |
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64 | ((__VALUE__) == LL_I2C_OWNADDRESS1_10BIT)) |
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65 | /** |
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66 | * @} |
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67 | */ |
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68 | |
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69 | /* Private function prototypes -----------------------------------------------*/ |
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70 | |
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71 | /* Exported functions --------------------------------------------------------*/ |
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72 | /** @addtogroup I2C_LL_Exported_Functions |
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73 | * @{ |
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74 | */ |
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75 | |
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76 | /** @addtogroup I2C_LL_EF_Init |
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77 | * @{ |
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78 | */ |
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79 | |
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80 | /** |
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81 | * @brief De-initialize the I2C registers to their default reset values. |
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82 | * @param I2Cx I2C Instance. |
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83 | * @retval An ErrorStatus enumeration value: |
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84 | * - SUCCESS: I2C registers are de-initialized |
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85 | * - ERROR: I2C registers are not de-initialized |
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86 | */ |
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87 | ErrorStatus LL_I2C_DeInit(I2C_TypeDef *I2Cx) |
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88 | { |
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89 | ErrorStatus status = SUCCESS; |
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90 | |
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91 | /* Check the I2C Instance I2Cx */ |
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92 | assert_param(IS_I2C_ALL_INSTANCE(I2Cx)); |
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93 | |
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94 | if (I2Cx == I2C1) |
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95 | { |
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96 | /* Force reset of I2C clock */ |
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97 | LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C1); |
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98 | |
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99 | /* Release reset of I2C clock */ |
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100 | LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C1); |
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101 | } |
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102 | else if (I2Cx == I2C2) |
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103 | { |
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104 | /* Force reset of I2C clock */ |
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105 | LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C2); |
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106 | |
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107 | /* Release reset of I2C clock */ |
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108 | LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C2); |
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109 | |
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110 | } |
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111 | else |
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112 | { |
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113 | status = ERROR; |
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114 | } |
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115 | |
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116 | return status; |
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117 | } |
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118 | |
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119 | /** |
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120 | * @brief Initialize the I2C registers according to the specified parameters in I2C_InitStruct. |
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121 | * @param I2Cx I2C Instance. |
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122 | * @param I2C_InitStruct pointer to a @ref LL_I2C_InitTypeDef structure. |
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123 | * @retval An ErrorStatus enumeration value: |
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124 | * - SUCCESS: I2C registers are initialized |
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125 | * - ERROR: Not applicable |
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126 | */ |
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127 | ErrorStatus LL_I2C_Init(I2C_TypeDef *I2Cx, LL_I2C_InitTypeDef *I2C_InitStruct) |
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128 | { |
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129 | /* Check the I2C Instance I2Cx */ |
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130 | assert_param(IS_I2C_ALL_INSTANCE(I2Cx)); |
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131 | |
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132 | /* Check the I2C parameters from I2C_InitStruct */ |
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133 | assert_param(IS_LL_I2C_PERIPHERAL_MODE(I2C_InitStruct->PeripheralMode)); |
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134 | assert_param(IS_LL_I2C_ANALOG_FILTER(I2C_InitStruct->AnalogFilter)); |
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135 | assert_param(IS_LL_I2C_DIGITAL_FILTER(I2C_InitStruct->DigitalFilter)); |
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136 | assert_param(IS_LL_I2C_OWN_ADDRESS1(I2C_InitStruct->OwnAddress1)); |
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137 | assert_param(IS_LL_I2C_TYPE_ACKNOWLEDGE(I2C_InitStruct->TypeAcknowledge)); |
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138 | assert_param(IS_LL_I2C_OWN_ADDRSIZE(I2C_InitStruct->OwnAddrSize)); |
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139 | |
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140 | /* Disable the selected I2Cx Peripheral */ |
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141 | LL_I2C_Disable(I2Cx); |
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142 | |
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143 | /*---------------------------- I2Cx CR1 Configuration ------------------------ |
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144 | * Configure the analog and digital noise filters with parameters : |
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145 | * - AnalogFilter: I2C_CR1_ANFOFF bit |
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146 | * - DigitalFilter: I2C_CR1_DNF[3:0] bits |
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147 | */ |
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148 | LL_I2C_ConfigFilters(I2Cx, I2C_InitStruct->AnalogFilter, I2C_InitStruct->DigitalFilter); |
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149 | |
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150 | /*---------------------------- I2Cx TIMINGR Configuration -------------------- |
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151 | * Configure the SDA setup, hold time and the SCL high, low period with parameter : |
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152 | * - Timing: I2C_TIMINGR_PRESC[3:0], I2C_TIMINGR_SCLDEL[3:0], I2C_TIMINGR_SDADEL[3:0], |
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153 | * I2C_TIMINGR_SCLH[7:0] and I2C_TIMINGR_SCLL[7:0] bits |
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154 | */ |
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155 | LL_I2C_SetTiming(I2Cx, I2C_InitStruct->Timing); |
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156 | |
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157 | /* Enable the selected I2Cx Peripheral */ |
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158 | LL_I2C_Enable(I2Cx); |
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159 | |
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160 | /*---------------------------- I2Cx OAR1 Configuration ----------------------- |
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161 | * Disable, Configure and Enable I2Cx device own address 1 with parameters : |
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162 | * - OwnAddress1: I2C_OAR1_OA1[9:0] bits |
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163 | * - OwnAddrSize: I2C_OAR1_OA1MODE bit |
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164 | */ |
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165 | LL_I2C_DisableOwnAddress1(I2Cx); |
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166 | LL_I2C_SetOwnAddress1(I2Cx, I2C_InitStruct->OwnAddress1, I2C_InitStruct->OwnAddrSize); |
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167 | |
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168 | /* OwnAdress1 == 0 is reserved for General Call address */ |
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169 | if (I2C_InitStruct->OwnAddress1 != 0U) |
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170 | { |
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171 | LL_I2C_EnableOwnAddress1(I2Cx); |
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172 | } |
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173 | |
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174 | /*---------------------------- I2Cx MODE Configuration ----------------------- |
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175 | * Configure I2Cx peripheral mode with parameter : |
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176 | * - PeripheralMode: I2C_CR1_SMBDEN and I2C_CR1_SMBHEN bits |
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177 | */ |
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178 | LL_I2C_SetMode(I2Cx, I2C_InitStruct->PeripheralMode); |
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179 | |
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180 | /*---------------------------- I2Cx CR2 Configuration ------------------------ |
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181 | * Configure the ACKnowledge or Non ACKnowledge condition |
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182 | * after the address receive match code or next received byte with parameter : |
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183 | * - TypeAcknowledge: I2C_CR2_NACK bit |
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184 | */ |
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185 | LL_I2C_AcknowledgeNextData(I2Cx, I2C_InitStruct->TypeAcknowledge); |
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186 | |
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187 | return SUCCESS; |
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188 | } |
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189 | |
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190 | /** |
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191 | * @brief Set each @ref LL_I2C_InitTypeDef field to default value. |
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192 | * @param I2C_InitStruct Pointer to a @ref LL_I2C_InitTypeDef structure. |
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193 | * @retval None |
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194 | */ |
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195 | void LL_I2C_StructInit(LL_I2C_InitTypeDef *I2C_InitStruct) |
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196 | { |
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197 | /* Set I2C_InitStruct fields to default values */ |
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198 | I2C_InitStruct->PeripheralMode = LL_I2C_MODE_I2C; |
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199 | I2C_InitStruct->Timing = 0U; |
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200 | I2C_InitStruct->AnalogFilter = LL_I2C_ANALOGFILTER_ENABLE; |
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201 | I2C_InitStruct->DigitalFilter = 0U; |
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202 | I2C_InitStruct->OwnAddress1 = 0U; |
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203 | I2C_InitStruct->TypeAcknowledge = LL_I2C_NACK; |
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204 | I2C_InitStruct->OwnAddrSize = LL_I2C_OWNADDRESS1_7BIT; |
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205 | } |
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206 | |
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207 | /** |
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208 | * @} |
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209 | */ |
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210 | |
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211 | /** |
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212 | * @} |
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213 | */ |
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214 | |
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215 | /** |
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216 | * @} |
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217 | */ |
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218 | |
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219 | #endif /* I2C1 || I2C2 */ |
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220 | |
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221 | /** |
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222 | * @} |
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223 | */ |
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224 | |
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225 | #endif /* USE_FULL_LL_DRIVER */ |
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226 | |
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227 | /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/ |
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