Jing Qiu / mbed

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Fork of mbed by gokmen ascioglu

I2CSlave.h@1:27d81db81dd7, 2015-03-03 (annotated)

Committer:
Jing_Qiu
Date:
Tue Mar 03 00:55:57 2015 +0000
Revision:
1:27d81db81dd7
Parent:
0:a8fa94490a0a 
revise

Who changed what in which revision?

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gokmenascioglu 0:a8fa94490a0a 1 /* mbed Microcontroller Library - I2CSlave
gokmenascioglu 0:a8fa94490a0a 2 * Copyright (c) 2007-2011 ARM Limited. All rights reserved.
gokmenascioglu 0:a8fa94490a0a 3 */
gokmenascioglu 0:a8fa94490a0a 4
gokmenascioglu 0:a8fa94490a0a 5 #ifndef MBED_I2C_SLAVE_H
gokmenascioglu 0:a8fa94490a0a 6 #define MBED_I2C_SLAVE_H
gokmenascioglu 0:a8fa94490a0a 7
gokmenascioglu 0:a8fa94490a0a 8 #include "device.h"
gokmenascioglu 0:a8fa94490a0a 9
gokmenascioglu 0:a8fa94490a0a 10 #if DEVICE_I2CSLAVE
gokmenascioglu 0:a8fa94490a0a 11
gokmenascioglu 0:a8fa94490a0a 12 #include "platform.h"
gokmenascioglu 0:a8fa94490a0a 13 #include "PinNames.h"
gokmenascioglu 0:a8fa94490a0a 14 #include "PeripheralNames.h"
gokmenascioglu 0:a8fa94490a0a 15 #include "Base.h"
gokmenascioglu 0:a8fa94490a0a 16
gokmenascioglu 0:a8fa94490a0a 17 namespace mbed {
gokmenascioglu 0:a8fa94490a0a 18
gokmenascioglu 0:a8fa94490a0a 19 /* Class: I2CSlave
gokmenascioglu 0:a8fa94490a0a 20 * An I2C Slave, used for communicating with an I2C Master device
gokmenascioglu 0:a8fa94490a0a 21 *
gokmenascioglu 0:a8fa94490a0a 22 * Example:
gokmenascioglu 0:a8fa94490a0a 23 * > // Simple I2C responder
gokmenascioglu 0:a8fa94490a0a 24 * > #include <mbed.h>
gokmenascioglu 0:a8fa94490a0a 25 * >
gokmenascioglu 0:a8fa94490a0a 26 * > I2CSlave slave(p9, p10);
gokmenascioglu 0:a8fa94490a0a 27 * >
gokmenascioglu 0:a8fa94490a0a 28 * > int main() {
gokmenascioglu 0:a8fa94490a0a 29 * > char buf[10];
gokmenascioglu 0:a8fa94490a0a 30 * > char msg[] = "Slave!";
gokmenascioglu 0:a8fa94490a0a 31 * >
gokmenascioglu 0:a8fa94490a0a 32 * > slave.address(0xA0);
gokmenascioglu 0:a8fa94490a0a 33 * > while (1) {
gokmenascioglu 0:a8fa94490a0a 34 * > int i = slave.receive();
gokmenascioglu 0:a8fa94490a0a 35 * > switch (i) {
gokmenascioglu 0:a8fa94490a0a 36 * > case I2CSlave::ReadAddressed:
gokmenascioglu 0:a8fa94490a0a 37 * > slave.write(msg, strlen(msg) + 1); // Includes null char
gokmenascioglu 0:a8fa94490a0a 38 * > break;
gokmenascioglu 0:a8fa94490a0a 39 * > case I2CSlave::WriteGeneral:
gokmenascioglu 0:a8fa94490a0a 40 * > slave.read(buf, 10);
gokmenascioglu 0:a8fa94490a0a 41 * > printf("Read G: %s\n", buf);
gokmenascioglu 0:a8fa94490a0a 42 * > break;
gokmenascioglu 0:a8fa94490a0a 43 * > case I2CSlave::WriteAddressed:
gokmenascioglu 0:a8fa94490a0a 44 * > slave.read(buf, 10);
gokmenascioglu 0:a8fa94490a0a 45 * > printf("Read A: %s\n", buf);
gokmenascioglu 0:a8fa94490a0a 46 * > break;
gokmenascioglu 0:a8fa94490a0a 47 * > }
gokmenascioglu 0:a8fa94490a0a 48 * > for(int i = 0; i < 10; i++) buf[i] = 0; // Clear buffer
gokmenascioglu 0:a8fa94490a0a 49 * > }
gokmenascioglu 0:a8fa94490a0a 50 * > }
gokmenascioglu 0:a8fa94490a0a 51 * >
gokmenascioglu 0:a8fa94490a0a 52 */
gokmenascioglu 0:a8fa94490a0a 53 class I2CSlave : public Base {
gokmenascioglu 0:a8fa94490a0a 54
gokmenascioglu 0:a8fa94490a0a 55 public:
gokmenascioglu 0:a8fa94490a0a 56
gokmenascioglu 0:a8fa94490a0a 57 enum RxStatus {
gokmenascioglu 0:a8fa94490a0a 58 NoData = 0
gokmenascioglu 0:a8fa94490a0a 59 , ReadAddressed = 1
gokmenascioglu 0:a8fa94490a0a 60 , WriteGeneral = 2
gokmenascioglu 0:a8fa94490a0a 61 , WriteAddressed = 3
gokmenascioglu 0:a8fa94490a0a 62 };
gokmenascioglu 0:a8fa94490a0a 63
gokmenascioglu 0:a8fa94490a0a 64 /* Constructor: I2CSlave
gokmenascioglu 0:a8fa94490a0a 65 * Create an I2C Slave interface, connected to the specified pins.
gokmenascioglu 0:a8fa94490a0a 66 *
gokmenascioglu 0:a8fa94490a0a 67 * Variables:
gokmenascioglu 0:a8fa94490a0a 68 * sda - I2C data line pin
gokmenascioglu 0:a8fa94490a0a 69 * scl - I2C clock line pin
gokmenascioglu 0:a8fa94490a0a 70 */
gokmenascioglu 0:a8fa94490a0a 71 I2CSlave(PinName sda, PinName scl, const char *name = NULL);
gokmenascioglu 0:a8fa94490a0a 72
gokmenascioglu 0:a8fa94490a0a 73 /* Function: frequency
gokmenascioglu 0:a8fa94490a0a 74 * Set the frequency of the I2C interface
gokmenascioglu 0:a8fa94490a0a 75 *
gokmenascioglu 0:a8fa94490a0a 76 * Variables:
gokmenascioglu 0:a8fa94490a0a 77 * hz - The bus frequency in hertz
gokmenascioglu 0:a8fa94490a0a 78 */
gokmenascioglu 0:a8fa94490a0a 79 void frequency(int hz);
gokmenascioglu 0:a8fa94490a0a 80
gokmenascioglu 0:a8fa94490a0a 81 /* Function: receive
gokmenascioglu 0:a8fa94490a0a 82 * Checks to see if this I2C Slave has been addressed.
gokmenascioglu 0:a8fa94490a0a 83 *
gokmenascioglu 0:a8fa94490a0a 84 * Variables:
gokmenascioglu 0:a8fa94490a0a 85 * returns - a status indicating if the device has been addressed, and how
gokmenascioglu 0:a8fa94490a0a 86 * > NoData - the slave has not been addressed
gokmenascioglu 0:a8fa94490a0a 87 * > ReadAddressed - the master has requested a read from this slave
gokmenascioglu 0:a8fa94490a0a 88 * > WriteAddressed - the master is writing to this slave
gokmenascioglu 0:a8fa94490a0a 89 * > WriteGeneral - the master is writing to all slave
gokmenascioglu 0:a8fa94490a0a 90 */
gokmenascioglu 0:a8fa94490a0a 91 int receive(void);
gokmenascioglu 0:a8fa94490a0a 92
gokmenascioglu 0:a8fa94490a0a 93 /* Function: read
gokmenascioglu 0:a8fa94490a0a 94 * Read from an I2C master.
gokmenascioglu 0:a8fa94490a0a 95 *
gokmenascioglu 0:a8fa94490a0a 96 * Variables:
gokmenascioglu 0:a8fa94490a0a 97 * data - pointer to the byte array to read data in to
gokmenascioglu 0:a8fa94490a0a 98 * length - maximum number of bytes to read
gokmenascioglu 0:a8fa94490a0a 99 * returns - 0 on success, non-0 otherwise
gokmenascioglu 0:a8fa94490a0a 100 */
gokmenascioglu 0:a8fa94490a0a 101 int read(char *data, int length);
gokmenascioglu 0:a8fa94490a0a 102
gokmenascioglu 0:a8fa94490a0a 103 /* Function: read
gokmenascioglu 0:a8fa94490a0a 104 * Read a single byte from an I2C master.
gokmenascioglu 0:a8fa94490a0a 105 *
gokmenascioglu 0:a8fa94490a0a 106 * Variables:
gokmenascioglu 0:a8fa94490a0a 107 * returns - the byte read
gokmenascioglu 0:a8fa94490a0a 108 */
gokmenascioglu 0:a8fa94490a0a 109 int read(void);
gokmenascioglu 0:a8fa94490a0a 110
gokmenascioglu 0:a8fa94490a0a 111 /* Function: write
gokmenascioglu 0:a8fa94490a0a 112 * Write to an I2C master.
gokmenascioglu 0:a8fa94490a0a 113 *
gokmenascioglu 0:a8fa94490a0a 114 * Variables:
gokmenascioglu 0:a8fa94490a0a 115 * data - pointer to the byte array to be transmitted
gokmenascioglu 0:a8fa94490a0a 116 * length - the number of bytes to transmite
gokmenascioglu 0:a8fa94490a0a 117 * returns - a 0 on success, non-0 otherwise
gokmenascioglu 0:a8fa94490a0a 118 */
gokmenascioglu 0:a8fa94490a0a 119 int write(const char *data, int length);
gokmenascioglu 0:a8fa94490a0a 120
gokmenascioglu 0:a8fa94490a0a 121 /* Function: write
gokmenascioglu 0:a8fa94490a0a 122 * Write a single byte to an I2C master.
gokmenascioglu 0:a8fa94490a0a 123 *
gokmenascioglu 0:a8fa94490a0a 124 * Variables
gokmenascioglu 0:a8fa94490a0a 125 * data - the byte to write
gokmenascioglu 0:a8fa94490a0a 126 * returns - a '1' if an ACK was received, a '0' otherwise
gokmenascioglu 0:a8fa94490a0a 127 */
gokmenascioglu 0:a8fa94490a0a 128 int write(int data);
gokmenascioglu 0:a8fa94490a0a 129
gokmenascioglu 0:a8fa94490a0a 130 /* Function: address
gokmenascioglu 0:a8fa94490a0a 131 * Sets the I2C slave address.
gokmenascioglu 0:a8fa94490a0a 132 *
gokmenascioglu 0:a8fa94490a0a 133 * Variables
gokmenascioglu 0:a8fa94490a0a 134 * address - the address to set for the slave (ignoring the least
gokmenascioglu 0:a8fa94490a0a 135 * signifcant bit). If set to 0, the slave will only respond to the
gokmenascioglu 0:a8fa94490a0a 136 * general call address.
gokmenascioglu 0:a8fa94490a0a 137 */
gokmenascioglu 0:a8fa94490a0a 138 void address(int address);
gokmenascioglu 0:a8fa94490a0a 139
gokmenascioglu 0:a8fa94490a0a 140 /* Function: stop
gokmenascioglu 0:a8fa94490a0a 141 * Reset the I2C slave back into the known ready receiving state.
gokmenascioglu 0:a8fa94490a0a 142 */
gokmenascioglu 0:a8fa94490a0a 143 void stop(void);
gokmenascioglu 0:a8fa94490a0a 144
gokmenascioglu 0:a8fa94490a0a 145 protected:
gokmenascioglu 0:a8fa94490a0a 146
gokmenascioglu 0:a8fa94490a0a 147 I2CName _i2c;
gokmenascioglu 0:a8fa94490a0a 148 };
gokmenascioglu 0:a8fa94490a0a 149
gokmenascioglu 0:a8fa94490a0a 150 } // namespace mbed
gokmenascioglu 0:a8fa94490a0a 151
gokmenascioglu 0:a8fa94490a0a 152 #endif
gokmenascioglu 0:a8fa94490a0a 153
gokmenascioglu 0:a8fa94490a0a 154 #endif
gokmenascioglu 0:a8fa94490a0a 155