PIR grove sensor that sends the sensed data to Thingspeak.com through the wifi module ESP 8266
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I2CSlave.h
00001 /* mbed Microcontroller Library 00002 * Copyright (c) 2006-2013 ARM Limited 00003 * 00004 * Licensed under the Apache License, Version 2.0 (the "License"); 00005 * you may not use this file except in compliance with the License. 00006 * You may obtain a copy of the License at 00007 * 00008 * http://www.apache.org/licenses/LICENSE-2.0 00009 * 00010 * Unless required by applicable law or agreed to in writing, software 00011 * distributed under the License is distributed on an "AS IS" BASIS, 00012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 00013 * See the License for the specific language governing permissions and 00014 * limitations under the License. 00015 */ 00016 #ifndef MBED_I2C_SLAVE_H 00017 #define MBED_I2C_SLAVE_H 00018 00019 #include "platform/platform.h" 00020 00021 #if DEVICE_I2CSLAVE 00022 00023 #include "hal/i2c_api.h" 00024 00025 namespace mbed { 00026 /** \addtogroup drivers */ 00027 /** @{*/ 00028 00029 /** An I2C Slave, used for communicating with an I2C Master device 00030 * 00031 * @Note Synchronization level: Not protected 00032 * 00033 * Example: 00034 * @code 00035 * // Simple I2C responder 00036 * #include <mbed.h> 00037 * 00038 * I2CSlave slave(p9, p10); 00039 * 00040 * int main() { 00041 * char buf[10]; 00042 * char msg[] = "Slave!"; 00043 * 00044 * slave.address(0xA0); 00045 * while (1) { 00046 * int i = slave.receive(); 00047 * switch (i) { 00048 * case I2CSlave::ReadAddressed: 00049 * slave.write(msg, strlen(msg) + 1); // Includes null char 00050 * break; 00051 * case I2CSlave::WriteGeneral: 00052 * slave.read(buf, 10); 00053 * printf("Read G: %s\n", buf); 00054 * break; 00055 * case I2CSlave::WriteAddressed: 00056 * slave.read(buf, 10); 00057 * printf("Read A: %s\n", buf); 00058 * break; 00059 * } 00060 * for(int i = 0; i < 10; i++) buf[i] = 0; // Clear buffer 00061 * } 00062 * } 00063 * @endcode 00064 */ 00065 class I2CSlave { 00066 00067 public: 00068 enum RxStatus { 00069 NoData = 0, 00070 ReadAddressed = 1, 00071 WriteGeneral = 2, 00072 WriteAddressed = 3 00073 }; 00074 00075 /** Create an I2C Slave interface, connected to the specified pins. 00076 * 00077 * @param sda I2C data line pin 00078 * @param scl I2C clock line pin 00079 */ 00080 I2CSlave(PinName sda, PinName scl); 00081 00082 /** Set the frequency of the I2C interface 00083 * 00084 * @param hz The bus frequency in hertz 00085 */ 00086 void frequency(int hz); 00087 00088 /** Checks to see if this I2C Slave has been addressed. 00089 * 00090 * @returns 00091 * A status indicating if the device has been addressed, and how 00092 * - NoData - the slave has not been addressed 00093 * - ReadAddressed - the master has requested a read from this slave 00094 * - WriteAddressed - the master is writing to this slave 00095 * - WriteGeneral - the master is writing to all slave 00096 */ 00097 int receive(void); 00098 00099 /** Read from an I2C master. 00100 * 00101 * @param data pointer to the byte array to read data in to 00102 * @param length maximum number of bytes to read 00103 * 00104 * @returns 00105 * 0 on success, 00106 * non-0 otherwise 00107 */ 00108 int read(char *data, int length); 00109 00110 /** Read a single byte from an I2C master. 00111 * 00112 * @returns 00113 * the byte read 00114 */ 00115 int read(void); 00116 00117 /** Write to an I2C master. 00118 * 00119 * @param data pointer to the byte array to be transmitted 00120 * @param length the number of bytes to transmite 00121 * 00122 * @returns 00123 * 0 on success, 00124 * non-0 otherwise 00125 */ 00126 int write(const char *data, int length); 00127 00128 /** Write a single byte to an I2C master. 00129 * 00130 * @data the byte to write 00131 * 00132 * @returns 00133 * '1' if an ACK was received, 00134 * '0' otherwise 00135 */ 00136 int write(int data); 00137 00138 /** Sets the I2C slave address. 00139 * 00140 * @param address The address to set for the slave (ignoring the least 00141 * signifcant bit). If set to 0, the slave will only respond to the 00142 * general call address. 00143 */ 00144 void address(int address); 00145 00146 /** Reset the I2C slave back into the known ready receiving state. 00147 */ 00148 void stop(void); 00149 00150 protected: 00151 i2c_t _i2c; 00152 }; 00153 00154 } // namespace mbed 00155 00156 #endif 00157 00158 #endif 00159 00160 /** @}*/
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