210 lines
6.6 KiB
Plaintext
210 lines
6.6 KiB
Plaintext
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C51 COMPILER V9.60.7.0 IIC 03/10/2025 18:03:54 PAGE 1
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C51 COMPILER V9.60.7.0, COMPILATION OF MODULE IIC
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OBJECT MODULE PLACED IN .\Objects\iic.obj
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COMPILER INVOKED BY: D:\Keil_v5\C51\BIN\C51.EXE ..\driver\iic.c OPTIMIZE(8,SPEED) BROWSE INCDIR(..\driver;..\user) DEBUG
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- OBJECTEXTEND PRINT(.\Listings\iic.lst) TABS(2) OBJECT(.\Objects\iic.obj)
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line level source
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1 /* # I2C代码片段说明
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2 1. 本文件夹中提供的驱动代码供参赛选手完成程序设计参考。
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3 2.
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4 参赛选手可以自行编写相关代码或以该代码为基础，根据所选单片机类型、运<E38081>
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-<2D><>速度和试题
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5 中对单片机时钟频率的要求，进行代码调试和修改。
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6 */
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7 #include "iic.h"
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8
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9 #include "intrins.h"
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10 #define DELAY_TIME 5
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11 sbit scl = P2 ^ 0;
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12 sbit sda = P2 ^ 1;
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13 //
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14 static void I2C_Delay(unsigned char n) {
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15 1 do {
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16 2 _nop_();
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17 2 _nop_();
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18 2 _nop_();
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19 2 _nop_();
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20 2 _nop_();
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21 2 _nop_();
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22 2 _nop_();
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23 2 _nop_();
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24 2 _nop_();
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25 2 _nop_();
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26 2 _nop_();
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27 2 _nop_();
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28 2 _nop_();
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29 2 _nop_();
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30 2 _nop_();
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31 2 } while (n--);
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32 1 }
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33
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34 //
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35 void I2CStart(void) {
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36 1 sda = 1;
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37 1 scl = 1;
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38 1 I2C_Delay(DELAY_TIME);
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39 1 sda = 0;
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40 1 I2C_Delay(DELAY_TIME);
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41 1 scl = 0;
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42 1 }
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43
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44 //
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45 void I2CStop(void) {
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46 1 sda = 0;
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47 1 scl = 1;
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48 1 I2C_Delay(DELAY_TIME);
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49 1 sda = 1;
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50 1 I2C_Delay(DELAY_TIME);
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51 1 }
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52
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53 //
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C51 COMPILER V9.60.7.0 IIC 03/10/2025 18:03:54 PAGE 2
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54 void I2CSendByte(unsigned char byt) {
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55 1 unsigned char i;
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56 1
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57 1 for (i = 0; i < 8; i++) {
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58 2 scl = 0;
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59 2 I2C_Delay(DELAY_TIME);
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60 2 if (byt & 0x80) {
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61 3 sda = 1;
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62 3 } else {
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63 3 sda = 0;
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64 3 }
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65 2 I2C_Delay(DELAY_TIME);
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66 2 scl = 1;
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67 2 byt <<= 1;
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68 2 I2C_Delay(DELAY_TIME);
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69 2 }
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70 1
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71 1 scl = 0;
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72 1 }
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73
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74 //
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75 unsigned char I2CReceiveByte(void) {
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76 1 unsigned char da;
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77 1 unsigned char i;
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78 1 for (i = 0; i < 8; i++) {
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79 2 scl = 1;
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80 2 I2C_Delay(DELAY_TIME);
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81 2 da <<= 1;
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82 2 if (sda) da |= 0x01;
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83 2 scl = 0;
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84 2 I2C_Delay(DELAY_TIME);
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85 2 }
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86 1 return da;
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87 1 }
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88
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89 //
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90 unsigned char I2CWaitAck(void) {
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91 1 unsigned char ackbit;
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92 1
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93 1 scl = 1;
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94 1 I2C_Delay(DELAY_TIME);
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95 1 ackbit = sda;
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96 1 scl = 0;
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97 1 I2C_Delay(DELAY_TIME);
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98 1
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99 1 return ackbit;
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100 1 }
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101
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102 //
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103 void I2CSendAck(unsigned char ackbit) {
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104 1 scl = 0;
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105 1 sda = ackbit;
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106 1 I2C_Delay(DELAY_TIME);
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107 1 scl = 1;
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108 1 I2C_Delay(DELAY_TIME);
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109 1 scl = 0;
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110 1 sda = 1;
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111 1 I2C_Delay(DELAY_TIME);
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112 1 }
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113
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114 unsigned char Ad_Read(unsigned char addr) {
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115 1 unsigned char temp;
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C51 COMPILER V9.60.7.0 IIC 03/10/2025 18:03:54 PAGE 3
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116 1 // 选择芯片为PCF
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117 1 I2CStart();
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118 1 I2CSendByte(0x90);
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119 1 I2CWaitAck();
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120 1 I2CSendByte(addr);
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121 1 I2CWaitAck();
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122 1
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123 1 I2CStart();
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124 1 I2CSendByte(0x91);
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125 1 I2CWaitAck();
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126 1 temp = I2CReceiveByte();
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127 1 I2CSendAck(1);
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128 1 I2CStop();
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129 1 return temp;
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130 1 }
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131 // 数字电压255->5V
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132 void Da_Write(unsigned char dat) {
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133 1 // 选择芯片为PCF
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134 1 I2CStart();
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135 1 I2CSendByte(0x90);
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136 1 I2CWaitAck();
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137 1 I2CSendByte(0x41);
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138 1 I2CWaitAck();
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139 1 I2CSendByte(dat);
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140 1 I2CWaitAck();
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141 1 }
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142 void EEPROM_Write(unsigned char *str, unsigned char addr, unsigned char num) {
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143 1 I2CStart();
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144 1 I2CSendByte(0xa0);
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145 1 I2CWaitAck();
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146 1 I2CSendByte(addr);
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147 1 I2CWaitAck();
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148 1
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149 1 while (num--) {
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150 2 I2CSendByte(*str++);
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151 2 I2CWaitAck();
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152 2 I2C_Delay(200);
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153 2 }
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154 1 I2CStop();
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155 1 I2C_Delay(255);
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156 1 I2C_Delay(255);
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157 1 I2C_Delay(255);
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158 1 I2C_Delay(255);
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159 1 }
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160 void EEPROM_Read(unsigned char *str, unsigned char addr, unsigned char num) {
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161 1 I2CStart();
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162 1 I2CSendByte(0xa0);
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163 1 I2CWaitAck();
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164 1 I2CSendByte(addr);
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165 1 I2CWaitAck();
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166 1
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167 1 I2CStart();
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168 1 I2CSendByte(0xa1);
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169 1 I2CWaitAck();
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170 1 while (num--) {
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171 2 *str++ = I2CReceiveByte();
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172 2 if (num)
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173 2 I2CSendAck(0);
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174 2 else
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175 2 I2CSendAck(1);
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176 2 }
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177 1 I2CStop();
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C51 COMPILER V9.60.7.0 IIC 03/10/2025 18:03:54 PAGE 4
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178 1 }
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MODULE INFORMATION: STATIC OVERLAYABLE
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CODE SIZE = 388 ----
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CONSTANT SIZE = ---- ----
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XDATA SIZE = ---- ----
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PDATA SIZE = ---- ----
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DATA SIZE = ---- 10
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IDATA SIZE = ---- ----
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BIT SIZE = ---- ----
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END OF MODULE INFORMATION.
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C51 COMPILATION COMPLETE. 0 WARNING(S), 0 ERROR(S)
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