Jing Qiu / mbed

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Fork of mbed by gokmen ascioglu

SPISlave.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?

UserRevisionLine numberNew contents of line
gokmenascioglu 0:a8fa94490a0a 1 /* mbed Microcontroller Library - SPISlave
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_SPISLAVE_H
gokmenascioglu 0:a8fa94490a0a 6 #define MBED_SPISLAVE_H
gokmenascioglu 0:a8fa94490a0a 7
gokmenascioglu 0:a8fa94490a0a 8 #include "device.h"
gokmenascioglu 0:a8fa94490a0a 9
gokmenascioglu 0:a8fa94490a0a 10 #if DEVICE_SPISLAVE
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: SPISlave
gokmenascioglu 0:a8fa94490a0a 20 * A SPI slave, used for communicating with a SPI Master device
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 * Example:
gokmenascioglu 0:a8fa94490a0a 25 * > // Reply to a SPI master as slave
gokmenascioglu 0:a8fa94490a0a 26 * >
gokmenascioglu 0:a8fa94490a0a 27 * > #include "mbed.h"
gokmenascioglu 0:a8fa94490a0a 28 * >
gokmenascioglu 0:a8fa94490a0a 29 * > SPISlave device(p5, p6, p7, p8); // mosi, miso, sclk, ssel
gokmenascioglu 0:a8fa94490a0a 30 * >
gokmenascioglu 0:a8fa94490a0a 31 * > int main() {
gokmenascioglu 0:a8fa94490a0a 32 * > device.reply(0x00); // Prime SPI with first reply
gokmenascioglu 0:a8fa94490a0a 33 * > while(1) {
gokmenascioglu 0:a8fa94490a0a 34 * > if(device.receive()) {
gokmenascioglu 0:a8fa94490a0a 35 * > int v = device.read(); // Read byte from master
gokmenascioglu 0:a8fa94490a0a 36 * > v = (v + 1) % 0x100; // Add one to it, modulo 256
gokmenascioglu 0:a8fa94490a0a 37 * > device.reply(v); // Make this the next reply
gokmenascioglu 0:a8fa94490a0a 38 * > }
gokmenascioglu 0:a8fa94490a0a 39 * > }
gokmenascioglu 0:a8fa94490a0a 40 * > }
gokmenascioglu 0:a8fa94490a0a 41 */
gokmenascioglu 0:a8fa94490a0a 42 class SPISlave : public Base {
gokmenascioglu 0:a8fa94490a0a 43
gokmenascioglu 0:a8fa94490a0a 44 public:
gokmenascioglu 0:a8fa94490a0a 45
gokmenascioglu 0:a8fa94490a0a 46 /* Constructor: SPI
gokmenascioglu 0:a8fa94490a0a 47 * Create a SPI slave connected to the specified pins
gokmenascioglu 0:a8fa94490a0a 48 *
gokmenascioglu 0:a8fa94490a0a 49 * Variables:
gokmenascioglu 0:a8fa94490a0a 50 * mosi - SPI Master Out, Slave In pin
gokmenascioglu 0:a8fa94490a0a 51 * miso - SPI Master In, Slave Out pin
gokmenascioglu 0:a8fa94490a0a 52 * sclk - SPI Clock pin
gokmenascioglu 0:a8fa94490a0a 53 * ssel - SPI chip select pin
gokmenascioglu 0:a8fa94490a0a 54 * name - (optional) A string to identify the object
gokmenascioglu 0:a8fa94490a0a 55 *
gokmenascioglu 0:a8fa94490a0a 56 * Pin Options:
gokmenascioglu 0:a8fa94490a0a 57 * (5, 6, 7i, 8) or (11, 12, 13, 14)
gokmenascioglu 0:a8fa94490a0a 58 *
gokmenascioglu 0:a8fa94490a0a 59 * mosi or miso can be specfied as NC if not used
gokmenascioglu 0:a8fa94490a0a 60 */
gokmenascioglu 0:a8fa94490a0a 61 SPISlave(PinName mosi, PinName miso, PinName sclk, PinName ssel,
gokmenascioglu 0:a8fa94490a0a 62 const char *name = NULL);
gokmenascioglu 0:a8fa94490a0a 63
gokmenascioglu 0:a8fa94490a0a 64 /* Function: format
gokmenascioglu 0:a8fa94490a0a 65 * Configure the data transmission format
gokmenascioglu 0:a8fa94490a0a 66 *
gokmenascioglu 0:a8fa94490a0a 67 * Variables:
gokmenascioglu 0:a8fa94490a0a 68 * bits - Number of bits per SPI frame (4 - 16)
gokmenascioglu 0:a8fa94490a0a 69 * mode - Clock polarity and phase mode (0 - 3)
gokmenascioglu 0:a8fa94490a0a 70 *
gokmenascioglu 0:a8fa94490a0a 71 * > mode | POL PHA
gokmenascioglu 0:a8fa94490a0a 72 * > -----+--------
gokmenascioglu 0:a8fa94490a0a 73 * > 0 | 0 0
gokmenascioglu 0:a8fa94490a0a 74 * > 1 | 0 1
gokmenascioglu 0:a8fa94490a0a 75 * > 2 | 1 0
gokmenascioglu 0:a8fa94490a0a 76 * > 3 | 1 1
gokmenascioglu 0:a8fa94490a0a 77 */
gokmenascioglu 0:a8fa94490a0a 78 void format(int bits, int mode = 0);
gokmenascioglu 0:a8fa94490a0a 79
gokmenascioglu 0:a8fa94490a0a 80 /* Function: frequency
gokmenascioglu 0:a8fa94490a0a 81 * Set the spi bus clock frequency
gokmenascioglu 0:a8fa94490a0a 82 *
gokmenascioglu 0:a8fa94490a0a 83 * Variables:
gokmenascioglu 0:a8fa94490a0a 84 * hz - SCLK frequency in hz (default = 1MHz)
gokmenascioglu 0:a8fa94490a0a 85 */
gokmenascioglu 0:a8fa94490a0a 86 void frequency(int hz = 1000000);
gokmenascioglu 0:a8fa94490a0a 87
gokmenascioglu 0:a8fa94490a0a 88 /* Function: receive
gokmenascioglu 0:a8fa94490a0a 89 * Polls the SPI to see if data has been received
gokmenascioglu 0:a8fa94490a0a 90 *
gokmenascioglu 0:a8fa94490a0a 91 * Variables:
gokmenascioglu 0:a8fa94490a0a 92 * returns - zero if no data, 1 otherwise
gokmenascioglu 0:a8fa94490a0a 93 */
gokmenascioglu 0:a8fa94490a0a 94 int receive(void);
gokmenascioglu 0:a8fa94490a0a 95
gokmenascioglu 0:a8fa94490a0a 96 /* Function: read
gokmenascioglu 0:a8fa94490a0a 97 * Retrieve data from receive buffer as slave
gokmenascioglu 0:a8fa94490a0a 98 *
gokmenascioglu 0:a8fa94490a0a 99 * Variables:
gokmenascioglu 0:a8fa94490a0a 100 * returns - the data in the receive buffer
gokmenascioglu 0:a8fa94490a0a 101 */
gokmenascioglu 0:a8fa94490a0a 102 int read(void);
gokmenascioglu 0:a8fa94490a0a 103
gokmenascioglu 0:a8fa94490a0a 104 /* Function: reply
gokmenascioglu 0:a8fa94490a0a 105 * Fill the transmission buffer with the value to be written out
gokmenascioglu 0:a8fa94490a0a 106 * as slave on the next received message from the master.
gokmenascioglu 0:a8fa94490a0a 107 *
gokmenascioglu 0:a8fa94490a0a 108 * Variables:
gokmenascioglu 0:a8fa94490a0a 109 * value - the data to be transmitted next
gokmenascioglu 0:a8fa94490a0a 110 */
gokmenascioglu 0:a8fa94490a0a 111 void reply(int value);
gokmenascioglu 0:a8fa94490a0a 112
gokmenascioglu 0:a8fa94490a0a 113 protected:
gokmenascioglu 0:a8fa94490a0a 114
gokmenascioglu 0:a8fa94490a0a 115 SPIName _spi;
gokmenascioglu 0:a8fa94490a0a 116
gokmenascioglu 0:a8fa94490a0a 117 int _bits;
gokmenascioglu 0:a8fa94490a0a 118 int _mode;
gokmenascioglu 0:a8fa94490a0a 119 int _hz;
gokmenascioglu 0:a8fa94490a0a 120
gokmenascioglu 0:a8fa94490a0a 121 };
gokmenascioglu 0:a8fa94490a0a 122
gokmenascioglu 0:a8fa94490a0a 123 } // namespace mbed
gokmenascioglu 0:a8fa94490a0a 124
gokmenascioglu 0:a8fa94490a0a 125 #endif
gokmenascioglu 0:a8fa94490a0a 126
gokmenascioglu 0:a8fa94490a0a 127 #endif