Plamen Totev / mbed

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Dependents:   Good_Serial_HelloWorld_Mbed

Fork of mbed by gokmen ascioglu

SPI.h@1:0b0a5a73f998, 2014-04-14 (annotated)

Committer:
redplam
Date:
Mon Apr 14 14:37:10 2014 +0000
Revision:
1:0b0a5a73f998
Parent:
0:a8fa94490a0a 
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Who changed what in which revision?

UserRevisionLine numberNew contents of line
gokmenascioglu 0:a8fa94490a0a 1 /* mbed Microcontroller Library - SPI
gokmenascioglu 0:a8fa94490a0a 2 * Copyright (c) 2010-2011 ARM Limited. All rights reserved.
gokmenascioglu 0:a8fa94490a0a 3 */
gokmenascioglu 0:a8fa94490a0a 4
gokmenascioglu 0:a8fa94490a0a 5 #ifndef MBED_SPI_H
gokmenascioglu 0:a8fa94490a0a 6 #define MBED_SPI_H
gokmenascioglu 0:a8fa94490a0a 7
gokmenascioglu 0:a8fa94490a0a 8 #include "device.h"
gokmenascioglu 0:a8fa94490a0a 9
gokmenascioglu 0:a8fa94490a0a 10 #if DEVICE_SPI
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: SPI
gokmenascioglu 0:a8fa94490a0a 20 * A SPI Master, used for communicating with SPI slave devices
gokmenascioglu 0:a8fa94490a0a 21 *
gokmenascioglu 0:a8fa94490a0a 22 * The default format is set to 8-bits, mode 0, and a clock frequency of 1MHz
gokmenascioglu 0:a8fa94490a0a 23 *
gokmenascioglu 0:a8fa94490a0a 24 * Most SPI devices will also require Chip Select and Reset signals. These
gokmenascioglu 0:a8fa94490a0a 25 * can be controlled using <DigitalOut> pins
gokmenascioglu 0:a8fa94490a0a 26 *
gokmenascioglu 0:a8fa94490a0a 27 * Example:
gokmenascioglu 0:a8fa94490a0a 28 * > // Send a byte to a SPI slave, and record the response
gokmenascioglu 0:a8fa94490a0a 29 * >
gokmenascioglu 0:a8fa94490a0a 30 * > #include "mbed.h"
gokmenascioglu 0:a8fa94490a0a 31 * >
gokmenascioglu 0:a8fa94490a0a 32 * > SPI device(p5, p6, p7); // mosi, miso, sclk
gokmenascioglu 0:a8fa94490a0a 33 * >
gokmenascioglu 0:a8fa94490a0a 34 * > int main() {
gokmenascioglu 0:a8fa94490a0a 35 * > int response = device.write(0xFF);
gokmenascioglu 0:a8fa94490a0a 36 * > }
gokmenascioglu 0:a8fa94490a0a 37 */
gokmenascioglu 0:a8fa94490a0a 38 class SPI : public Base {
gokmenascioglu 0:a8fa94490a0a 39
gokmenascioglu 0:a8fa94490a0a 40 public:
gokmenascioglu 0:a8fa94490a0a 41
gokmenascioglu 0:a8fa94490a0a 42 /* Constructor: SPI
gokmenascioglu 0:a8fa94490a0a 43 * Create a SPI master connected to the specified pins
gokmenascioglu 0:a8fa94490a0a 44 *
gokmenascioglu 0:a8fa94490a0a 45 * Variables:
gokmenascioglu 0:a8fa94490a0a 46 * mosi - SPI Master Out, Slave In pin
gokmenascioglu 0:a8fa94490a0a 47 * miso - SPI Master In, Slave Out pin
gokmenascioglu 0:a8fa94490a0a 48 * sclk - SPI Clock pin
gokmenascioglu 0:a8fa94490a0a 49 * name - (optional) A string to identify the object
gokmenascioglu 0:a8fa94490a0a 50 *
gokmenascioglu 0:a8fa94490a0a 51 * Pin Options:
gokmenascioglu 0:a8fa94490a0a 52 * (5, 6, 7) or (11, 12, 13)
gokmenascioglu 0:a8fa94490a0a 53 *
gokmenascioglu 0:a8fa94490a0a 54 * mosi or miso can be specfied as NC if not used
gokmenascioglu 0:a8fa94490a0a 55 */
gokmenascioglu 0:a8fa94490a0a 56 SPI(PinName mosi, PinName miso, PinName sclk, const char *name = NULL);
gokmenascioglu 0:a8fa94490a0a 57
gokmenascioglu 0:a8fa94490a0a 58 /* Function: format
gokmenascioglu 0:a8fa94490a0a 59 * Configure the data transmission format
gokmenascioglu 0:a8fa94490a0a 60 *
gokmenascioglu 0:a8fa94490a0a 61 * Variables:
gokmenascioglu 0:a8fa94490a0a 62 * bits - Number of bits per SPI frame (4 - 16)
gokmenascioglu 0:a8fa94490a0a 63 * mode - Clock polarity and phase mode (0 - 3)
gokmenascioglu 0:a8fa94490a0a 64 *
gokmenascioglu 0:a8fa94490a0a 65 * > mode | POL PHA
gokmenascioglu 0:a8fa94490a0a 66 * > -----+--------
gokmenascioglu 0:a8fa94490a0a 67 * > 0 | 0 0
gokmenascioglu 0:a8fa94490a0a 68 * > 1 | 0 1
gokmenascioglu 0:a8fa94490a0a 69 * > 2 | 1 0
gokmenascioglu 0:a8fa94490a0a 70 * > 3 | 1 1
gokmenascioglu 0:a8fa94490a0a 71 */
gokmenascioglu 0:a8fa94490a0a 72 void format(int bits, int mode = 0);
gokmenascioglu 0:a8fa94490a0a 73
gokmenascioglu 0:a8fa94490a0a 74 /* Function: frequency
gokmenascioglu 0:a8fa94490a0a 75 * Set the spi bus clock frequency
gokmenascioglu 0:a8fa94490a0a 76 *
gokmenascioglu 0:a8fa94490a0a 77 * Variables:
gokmenascioglu 0:a8fa94490a0a 78 * hz - SCLK frequency in hz (default = 1MHz)
gokmenascioglu 0:a8fa94490a0a 79 */
gokmenascioglu 0:a8fa94490a0a 80 void frequency(int hz = 1000000);
gokmenascioglu 0:a8fa94490a0a 81
gokmenascioglu 0:a8fa94490a0a 82 /* Function: write
gokmenascioglu 0:a8fa94490a0a 83 * Write to the SPI Slave and return the response
gokmenascioglu 0:a8fa94490a0a 84 *
gokmenascioglu 0:a8fa94490a0a 85 * Variables:
gokmenascioglu 0:a8fa94490a0a 86 * value - Data to be sent to the SPI slave
gokmenascioglu 0:a8fa94490a0a 87 * returns - Response from the SPI slave
gokmenascioglu 0:a8fa94490a0a 88 */
gokmenascioglu 0:a8fa94490a0a 89 virtual int write(int value);
gokmenascioglu 0:a8fa94490a0a 90
gokmenascioglu 0:a8fa94490a0a 91
gokmenascioglu 0:a8fa94490a0a 92 #ifdef MBED_RPC
gokmenascioglu 0:a8fa94490a0a 93 virtual const struct rpc_method *get_rpc_methods();
gokmenascioglu 0:a8fa94490a0a 94 static struct rpc_class *get_rpc_class();
gokmenascioglu 0:a8fa94490a0a 95 #endif
gokmenascioglu 0:a8fa94490a0a 96
gokmenascioglu 0:a8fa94490a0a 97 protected:
gokmenascioglu 0:a8fa94490a0a 98
gokmenascioglu 0:a8fa94490a0a 99 SPIName _spi;
gokmenascioglu 0:a8fa94490a0a 100
gokmenascioglu 0:a8fa94490a0a 101 void aquire(void);
gokmenascioglu 0:a8fa94490a0a 102 static SPI *_owner;
gokmenascioglu 0:a8fa94490a0a 103 int _bits;
gokmenascioglu 0:a8fa94490a0a 104 int _mode;
gokmenascioglu 0:a8fa94490a0a 105 int _hz;
gokmenascioglu 0:a8fa94490a0a 106
gokmenascioglu 0:a8fa94490a0a 107 };
gokmenascioglu 0:a8fa94490a0a 108
gokmenascioglu 0:a8fa94490a0a 109 } // namespace mbed
gokmenascioglu 0:a8fa94490a0a 110
gokmenascioglu 0:a8fa94490a0a 111 #endif
gokmenascioglu 0:a8fa94490a0a 112
gokmenascioglu 0:a8fa94490a0a 113 #endif