Marco Zecchini
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Example_RTOS
Rtos API example
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SPISlave.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_SPISLAVE_H 00017 #define MBED_SPISLAVE_H 00018 00019 #include "platform/platform.h" 00020 #include "platform/NonCopyable.h" 00021 00022 #if defined (DEVICE_SPISLAVE) || defined(DOXYGEN_ONLY) 00023 00024 #include "hal/spi_api.h" 00025 00026 namespace mbed { 00027 /** \addtogroup drivers */ 00028 00029 /** A SPI slave, used for communicating with a SPI Master device 00030 * 00031 * The default format is set to 8-bits, mode 0, and a clock frequency of 1MHz 00032 * 00033 * @note Synchronization level: Not protected 00034 * 00035 * Example: 00036 * @code 00037 * // Reply to a SPI master as slave 00038 * 00039 * #include "mbed.h" 00040 * 00041 * SPISlave device(p5, p6, p7, p8); // mosi, miso, sclk, ssel 00042 * 00043 * int main() { 00044 * device.reply(0x00); // Prime SPI with first reply 00045 * while(1) { 00046 * if(device.receive()) { 00047 * int v = device.read(); // Read byte from master 00048 * v = (v + 1) % 0x100; // Add one to it, modulo 256 00049 * device.reply(v); // Make this the next reply 00050 * } 00051 * } 00052 * } 00053 * @endcode 00054 * @ingroup drivers 00055 */ 00056 class SPISlave : private NonCopyable<SPISlave> { 00057 00058 public: 00059 00060 /** Create a SPI slave connected to the specified pins 00061 * 00062 * mosi or miso can be specfied as NC if not used 00063 * 00064 * @param mosi SPI Master Out, Slave In pin 00065 * @param miso SPI Master In, Slave Out pin 00066 * @param sclk SPI Clock pin 00067 * @param ssel SPI chip select pin 00068 */ 00069 SPISlave(PinName mosi, PinName miso, PinName sclk, PinName ssel); 00070 00071 /** Configure the data transmission format 00072 * 00073 * @param bits Number of bits per SPI frame (4 - 16) 00074 * @param mode Clock polarity and phase mode (0 - 3) 00075 * 00076 * @code 00077 * mode | POL PHA 00078 * -----+-------- 00079 * 0 | 0 0 00080 * 1 | 0 1 00081 * 2 | 1 0 00082 * 3 | 1 1 00083 * @endcode 00084 */ 00085 void format(int bits, int mode = 0); 00086 00087 /** Set the spi bus clock frequency 00088 * 00089 * @param hz SCLK frequency in hz (default = 1MHz) 00090 */ 00091 void frequency(int hz = 1000000); 00092 00093 /** Polls the SPI to see if data has been received 00094 * 00095 * @returns 00096 * 0 if no data, 00097 * 1 otherwise 00098 */ 00099 int receive(void); 00100 00101 /** Retrieve data from receive buffer as slave 00102 * 00103 * @returns 00104 * the data in the receive buffer 00105 */ 00106 int read(void); 00107 00108 /** Fill the transmission buffer with the value to be written out 00109 * as slave on the next received message from the master. 00110 * 00111 * @param value the data to be transmitted next 00112 */ 00113 void reply(int value); 00114 00115 protected: 00116 spi_t _spi; 00117 00118 int _bits; 00119 int _mode; 00120 int _hz; 00121 }; 00122 00123 } // namespace mbed 00124 00125 #endif 00126 00127 #endif
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