Dave Thomas / MCP23S17

Updated memory address #defines to avoid clashes with other libraries and f411re board defines

MCP23S17.h@0:e43a0fe24907, 2011-11-02 (annotated)

Committer:
stjo2809
Date:
Wed Nov 02 20:51:30 2011 +0000
Revision:
0:e43a0fe24907
Child:
1:f93b811965d8
1st. Release

Who changed what in which revision?

UserRevisionLine numberNew contents of line
stjo2809 0:e43a0fe24907 1 /* mbed MCP23S17 Library, for driving the MCP23S17 16-Bit I/O Expander with Serial Interface (SPI)
stjo2809 0:e43a0fe24907 2 * Copyright (c) 2011, Created by Steen Joergensen (stjo2809) inspired by Romilly Cocking MCP23S17 library
stjo2809 0:e43a0fe24907 3 *
stjo2809 0:e43a0fe24907 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
stjo2809 0:e43a0fe24907 5 * of this software and associated documentation files (the "Software"), to deal
stjo2809 0:e43a0fe24907 6 * in the Software without restriction, including without limitation the rights
stjo2809 0:e43a0fe24907 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
stjo2809 0:e43a0fe24907 8 * copies of the Software, and to permit persons to whom the Software is
stjo2809 0:e43a0fe24907 9 * furnished to do so, subject to the following conditions:
stjo2809 0:e43a0fe24907 10 *
stjo2809 0:e43a0fe24907 11 * The above copyright notice and this permission notice shall be included in
stjo2809 0:e43a0fe24907 12 * all copies or substantial portions of the Software.
stjo2809 0:e43a0fe24907 13 *
stjo2809 0:e43a0fe24907 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
stjo2809 0:e43a0fe24907 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
stjo2809 0:e43a0fe24907 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
stjo2809 0:e43a0fe24907 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
stjo2809 0:e43a0fe24907 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
stjo2809 0:e43a0fe24907 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
stjo2809 0:e43a0fe24907 20 * THE SOFTWARE.
stjo2809 0:e43a0fe24907 21 */
stjo2809 0:e43a0fe24907 22
stjo2809 0:e43a0fe24907 23 #include "mbed.h"
stjo2809 0:e43a0fe24907 24
stjo2809 0:e43a0fe24907 25 #ifndef MBED_MCP23S17_H
stjo2809 0:e43a0fe24907 26 #define MBED_MCP23S17_H
stjo2809 0:e43a0fe24907 27
stjo2809 0:e43a0fe24907 28 //=============================================================================
stjo2809 0:e43a0fe24907 29 // All Registers and there Address if BANK = 0
stjo2809 0:e43a0fe24907 30 //=============================================================================
stjo2809 0:e43a0fe24907 31
stjo2809 0:e43a0fe24907 32 #define IODIRA 0x00 // Controls the direction of the data I/O on Port A
stjo2809 0:e43a0fe24907 33 #define IODIRB 0x01 // Controls the direction of the data I/O on Port B
stjo2809 0:e43a0fe24907 34 #define IPOLA 0x02 // Configure the polarity on the corresponding GPIO (Port A)
stjo2809 0:e43a0fe24907 35 #define IPOLB 0x03 // Configure the polarity on the corresponding GPIO (Port B)
stjo2809 0:e43a0fe24907 36 #define GPINTENA 0x04 // Controls the interrupt-on change feature for each pin for Port A
stjo2809 0:e43a0fe24907 37 #define GPINTENB 0x05 // Controls the interrupt-on change feature for each pin for Port B
stjo2809 0:e43a0fe24907 38 #define DEFVALA 0x06 // The default comparison value if the INTCONA is set to "1" for Port A
stjo2809 0:e43a0fe24907 39 #define DEFVALB 0x07 // The default comparison value if the INTCONA is set to "1" for Port B
stjo2809 0:e43a0fe24907 40 #define INTCONA 0x08 // Controls how the associated pin value is compared for the interrupt-on-change feature for Port A
stjo2809 0:e43a0fe24907 41 #define INTCONB 0x09 // Controls how the associated pin value is compared for the interrupt-on-change feature for Port B
stjo2809 0:e43a0fe24907 42 #define IOCON 0x0A // Contains several bits for configuring the device
stjo2809 0:e43a0fe24907 43 #define GPPUA 0x0C // Controls the pull-up resistors for the port pins for port A
stjo2809 0:e43a0fe24907 44 #define GPPUB 0x0D // Controls the pull-up resistors for the port pins for port B
stjo2809 0:e43a0fe24907 45 #define INTFA 0x0E // READ ONLY // reflects the interrupt condition on port A pins of any pin that is enabled for interrupts via the GPINTEN register.
stjo2809 0:e43a0fe24907 46 #define INTFB 0x0F // READ ONLY // reflects the interrupt condition on port B pins of any pin that is enabled for interrupts via the GPINTEN register.
stjo2809 0:e43a0fe24907 47 #define INTCAPA 0x10 // READ ONLY // captures the GPIO port A value at the time the interrupt occurred
stjo2809 0:e43a0fe24907 48 #define INTCAPB 0x11 // READ ONLY // captures the GPIO port B value at the time the interrupt occurred
stjo2809 0:e43a0fe24907 49 #define GPIOA 0x12 // Reflects the value on the port A (doing write function it only read input)
stjo2809 0:e43a0fe24907 50 #define GPIOB 0x13 // Reflects the value on the port B (doing write function it only read input)
stjo2809 0:e43a0fe24907 51 #define OLATA 0x14 // A write to this register modifies the output latches that modifies the pins configured as outputs for Port A
stjo2809 0:e43a0fe24907 52 #define OLATB 0x15 // A write to this register modifies the output latches that modifies the pins configured as outputs for Port B
stjo2809 0:e43a0fe24907 53
stjo2809 0:e43a0fe24907 54 //=============================================================================
stjo2809 0:e43a0fe24907 55 // Declaration of variables & custom #defines
stjo2809 0:e43a0fe24907 56 //=============================================================================
stjo2809 0:e43a0fe24907 57
stjo2809 0:e43a0fe24907 58 #define INTERRUPT_MIRROR_BIT 0x40
stjo2809 0:e43a0fe24907 59 #define INTERRUPT_POLARITY_BIT 0x02
stjo2809 0:e43a0fe24907 60
stjo2809 0:e43a0fe24907 61 enum Port { PORT_A, PORT_B };
stjo2809 0:e43a0fe24907 62 enum Polarity { ACTIVE_LOW, ACTIVE_HIGH };
stjo2809 0:e43a0fe24907 63
stjo2809 0:e43a0fe24907 64 //=============================================================================
stjo2809 0:e43a0fe24907 65 // Functions Declaration
stjo2809 0:e43a0fe24907 66 //=============================================================================
stjo2809 0:e43a0fe24907 67
stjo2809 0:e43a0fe24907 68 /** Interface to the MCP23S17 16-Bit I/O Expander with Serial Interface (SPI)
stjo2809 0:e43a0fe24907 69 *
stjo2809 0:e43a0fe24907 70 * Using the driver:
stjo2809 0:e43a0fe24907 71 * - remenber to setup SPI in main routine.
stjo2809 0:e43a0fe24907 72 * - remenber to setup interrupt pin or pins in main routine (if you are using interrupts).
stjo2809 0:e43a0fe24907 73 *
stjo2809 0:e43a0fe24907 74 * Defaults in this driver:
stjo2809 0:e43a0fe24907 75 * - as default is hardware adressing "On" and if disable use "0" in hardwareaddress when creating the instance.
stjo2809 0:e43a0fe24907 76 * - as default is interrupt pins "Active High".
stjo2809 0:e43a0fe24907 77 * - as default is INTA is associated with PortA and INTB is associated with PortB.
stjo2809 0:e43a0fe24907 78 *
stjo2809 0:e43a0fe24907 79 * Limitations of using this driver:
stjo2809 0:e43a0fe24907 80 * - can't use Open-Drain output.
stjo2809 0:e43a0fe24907 81 * - can't use Sequential Operation mode bit.
stjo2809 0:e43a0fe24907 82 * - can't use BANK 1 addressing.
stjo2809 0:e43a0fe24907 83 *
stjo2809 0:e43a0fe24907 84 */
stjo2809 0:e43a0fe24907 85 class MCP23S17 {
stjo2809 0:e43a0fe24907 86 public:
stjo2809 0:e43a0fe24907 87 /** Create an instance of the MCP23S17 connected to specfied SPI pins, with the specified address.
stjo2809 0:e43a0fe24907 88 *
stjo2809 0:e43a0fe24907 89 * @param hardwareaddress The SPI hardware address 0-7 for this MCP23S17.
stjo2809 0:e43a0fe24907 90 * @param spi The mbed SPI instance (make in main routine)
stjo2809 0:e43a0fe24907 91 * @param nCs The SPI chip select pin.
stjo2809 0:e43a0fe24907 92 * @param nReset The Hardware reset pin.
stjo2809 0:e43a0fe24907 93 */
stjo2809 0:e43a0fe24907 94 MCP23S17(int hardwareaddress, SPI& spi, PinName nCs, PinName nReset);
stjo2809 0:e43a0fe24907 95
stjo2809 0:e43a0fe24907 96 /** Read the port IO pins level.
stjo2809 0:e43a0fe24907 97 *
stjo2809 0:e43a0fe24907 98 * @param Port The selected port to read from.
stjo2809 0:e43a0fe24907 99 * @return The 8 bits read, but only the value of the inputs (outputs is read as "0").
stjo2809 0:e43a0fe24907 100 */
stjo2809 0:e43a0fe24907 101 char read(Port port);
stjo2809 0:e43a0fe24907 102
stjo2809 0:e43a0fe24907 103 /** Write to the port IO pins.
stjo2809 0:e43a0fe24907 104 *
stjo2809 0:e43a0fe24907 105 * @param Port The selected port to write to.
stjo2809 0:e43a0fe24907 106 * @param data The 8 bits to write to the IO port, but will only change the output.
stjo2809 0:e43a0fe24907 107 */
stjo2809 0:e43a0fe24907 108 void write(Port port, char data);
stjo2809 0:e43a0fe24907 109
stjo2809 0:e43a0fe24907 110 /** Resetting the MCP23S17.
stjo2809 0:e43a0fe24907 111 *
stjo2809 0:e43a0fe24907 112 * Reset has to be pull down for min. 1uS to insure correct reset.
stjo2809 0:e43a0fe24907 113 * This function pull down the reset pin for 5uS.
stjo2809 0:e43a0fe24907 114 */
stjo2809 0:e43a0fe24907 115 void reset();
stjo2809 0:e43a0fe24907 116
stjo2809 0:e43a0fe24907 117 /** Configure the control setting (IOCON register).
stjo2809 0:e43a0fe24907 118 *
stjo2809 0:e43a0fe24907 119 * @param data The 8 bits to write to IOCON register.
stjo2809 0:e43a0fe24907 120 */
stjo2809 0:e43a0fe24907 121 void config_control_register(char data);
stjo2809 0:e43a0fe24907 122
stjo2809 0:e43a0fe24907 123 /** Configure if the port pins has Pull ups or not (GPPUn register).
stjo2809 0:e43a0fe24907 124 *
stjo2809 0:e43a0fe24907 125 * @param Port The selected port to write to.
stjo2809 0:e43a0fe24907 126 * @param data The 8 bits to write to GPPUn register.
stjo2809 0:e43a0fe24907 127 */
stjo2809 0:e43a0fe24907 128 void config_pullups(Port port, char data);
stjo2809 0:e43a0fe24907 129
stjo2809 0:e43a0fe24907 130 /** Configure the direction of the port pins (IODIRn register).
stjo2809 0:e43a0fe24907 131 *
stjo2809 0:e43a0fe24907 132 * @param Port The selected port to write to.
stjo2809 0:e43a0fe24907 133 * @param data The 8 bits to write to IODIRn register.
stjo2809 0:e43a0fe24907 134 */
stjo2809 0:e43a0fe24907 135 void config_direction(Port port, char data);
stjo2809 0:e43a0fe24907 136
stjo2809 0:e43a0fe24907 137 /** Configure the input polarity of the port pins (IPOLn register).
stjo2809 0:e43a0fe24907 138 *
stjo2809 0:e43a0fe24907 139 * @param Port The selected port to write to.
stjo2809 0:e43a0fe24907 140 * @param data The 8 bits to write to IPOLn register.
stjo2809 0:e43a0fe24907 141 */
stjo2809 0:e43a0fe24907 142 void config_polarity(Port port, char data);
stjo2809 0:e43a0fe24907 143
stjo2809 0:e43a0fe24907 144 /** Configure if the port pins is interruptable or not (GPINTENn register).
stjo2809 0:e43a0fe24907 145 *
stjo2809 0:e43a0fe24907 146 * @param Port The selected port to write to.
stjo2809 0:e43a0fe24907 147 * @param data The 8 bits to write to GPINTENn register.
stjo2809 0:e43a0fe24907 148 */
stjo2809 0:e43a0fe24907 149 void config_interrupt_enable(Port port, char data);
stjo2809 0:e43a0fe24907 150
stjo2809 0:e43a0fe24907 151 /** Configure if the interrupts is compared to default value register or against the previous value (INTCONn register).
stjo2809 0:e43a0fe24907 152 *
stjo2809 0:e43a0fe24907 153 * @param Port The selected port to write to.
stjo2809 0:e43a0fe24907 154 * @param data The 8 bits to write to INTCONn register.
stjo2809 0:e43a0fe24907 155 */
stjo2809 0:e43a0fe24907 156 void config_interrupt_control(Port port, char data);
stjo2809 0:e43a0fe24907 157
stjo2809 0:e43a0fe24907 158 /** Configure if the interrupts pins is connected internally or separated into intA and intB (default = separated).
stjo2809 0:e43a0fe24907 159 *
stjo2809 0:e43a0fe24907 160 * @param mirror Write True or False (True = interconnected).
stjo2809 0:e43a0fe24907 161 */
stjo2809 0:e43a0fe24907 162 void config_mirror_interrupt(bool mirror);
stjo2809 0:e43a0fe24907 163
stjo2809 0:e43a0fe24907 164 /** Configure the default value that the interrupt value is compared to if it setup for use (DEFVALn register).
stjo2809 0:e43a0fe24907 165 *
stjo2809 0:e43a0fe24907 166 * @param Port The selected port to write to.
stjo2809 0:e43a0fe24907 167 * @param data The 8 bits to write to DEFVALn register.
stjo2809 0:e43a0fe24907 168 */
stjo2809 0:e43a0fe24907 169 void config_defaultvalue(Port port, char data);
stjo2809 0:e43a0fe24907 170
stjo2809 0:e43a0fe24907 171 /** Configure if the interrupts is active high or active low.
stjo2809 0:e43a0fe24907 172 *
stjo2809 0:e43a0fe24907 173 * @param polarity Write ACTIVE_LOW or ACTIVE_HIGH.
stjo2809 0:e43a0fe24907 174 */
stjo2809 0:e43a0fe24907 175 void config_interrupt_polarity(Polarity polarity);
stjo2809 0:e43a0fe24907 176
stjo2809 0:e43a0fe24907 177 /** Read the interrupt flags for the port.
stjo2809 0:e43a0fe24907 178 *
stjo2809 0:e43a0fe24907 179 * @param Port The selected port to read from.
stjo2809 0:e43a0fe24907 180 * @return The 8 bits read, but only value for the inputs (outputs is read as "0").
stjo2809 0:e43a0fe24907 181 */
stjo2809 0:e43a0fe24907 182 char read_interrupt_flag(Port port);
stjo2809 0:e43a0fe24907 183
stjo2809 0:e43a0fe24907 184 /** Read the value of the port captured the time the interrupt occurred (use this is for fast changing inputs).
stjo2809 0:e43a0fe24907 185 *
stjo2809 0:e43a0fe24907 186 * @param Port The selected port to read from.
stjo2809 0:e43a0fe24907 187 * @return The 8 bits read, but only value for the inputs (outputs is read as "0").
stjo2809 0:e43a0fe24907 188 */
stjo2809 0:e43a0fe24907 189 char read_interrupt_capture(Port port);
stjo2809 0:e43a0fe24907 190
stjo2809 0:e43a0fe24907 191 private:
stjo2809 0:e43a0fe24907 192 SPI& _spi;
stjo2809 0:e43a0fe24907 193 DigitalOut _nCs;
stjo2809 0:e43a0fe24907 194 DigitalOut _nReset;
stjo2809 0:e43a0fe24907 195 int _hardwareaddress;
stjo2809 0:e43a0fe24907 196 char _writeopcode;
stjo2809 0:e43a0fe24907 197 char _readopcode;
stjo2809 0:e43a0fe24907 198 void _initialization();
stjo2809 0:e43a0fe24907 199 void _make_opcode(int _hardwareaddress);
stjo2809 0:e43a0fe24907 200 char _read(char address); // _read function is overloaded
stjo2809 0:e43a0fe24907 201 char _read(Port port, char address);
stjo2809 0:e43a0fe24907 202 void _write(char address, char data); // _write function is overloaded
stjo2809 0:e43a0fe24907 203 void _write(Port port, char address, char data);
stjo2809 0:e43a0fe24907 204
stjo2809 0:e43a0fe24907 205 };
stjo2809 0:e43a0fe24907 206
stjo2809 0:e43a0fe24907 207 #endif
stjo2809 0:e43a0fe24907 208