added prescaler for 16 bit pwm in LPC1347 target
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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.h" 00020 00021 #if DEVICE_SPISLAVE 00022 00023 #include "spi_api.h" 00024 00025 namespace mbed { 00026 00027 /** A SPI slave, used for communicating with a SPI Master device 00028 * 00029 * The default format is set to 8-bits, mode 0, and a clock frequency of 1MHz 00030 * 00031 * @Note Synchronization level: Not protected 00032 * 00033 * Example: 00034 * @code 00035 * // Reply to a SPI master as slave 00036 * 00037 * #include "mbed.h" 00038 * 00039 * SPISlave device(p5, p6, p7, p8); // mosi, miso, sclk, ssel 00040 * 00041 * int main() { 00042 * device.reply(0x00); // Prime SPI with first reply 00043 * while(1) { 00044 * if(device.receive()) { 00045 * int v = device.read(); // Read byte from master 00046 * v = (v + 1) % 0x100; // Add one to it, modulo 256 00047 * device.reply(v); // Make this the next reply 00048 * } 00049 * } 00050 * } 00051 * @endcode 00052 */ 00053 class SPISlave { 00054 00055 public: 00056 00057 /** Create a SPI slave connected to the specified pins 00058 * 00059 * mosi or miso can be specfied as NC if not used 00060 * 00061 * @param mosi SPI Master Out, Slave In pin 00062 * @param miso SPI Master In, Slave Out pin 00063 * @param sclk SPI Clock pin 00064 * @param ssel SPI chip select pin 00065 */ 00066 SPISlave(PinName mosi, PinName miso, PinName sclk, PinName ssel); 00067 00068 /** Configure the data transmission format 00069 * 00070 * @param bits Number of bits per SPI frame (4 - 16) 00071 * @param mode Clock polarity and phase mode (0 - 3) 00072 * 00073 * @code 00074 * mode | POL PHA 00075 * -----+-------- 00076 * 0 | 0 0 00077 * 1 | 0 1 00078 * 2 | 1 0 00079 * 3 | 1 1 00080 * @endcode 00081 */ 00082 void format(int bits, int mode = 0); 00083 00084 /** Set the spi bus clock frequency 00085 * 00086 * @param hz SCLK frequency in hz (default = 1MHz) 00087 */ 00088 void frequency(int hz = 1000000); 00089 00090 /** Polls the SPI to see if data has been received 00091 * 00092 * @returns 00093 * 0 if no data, 00094 * 1 otherwise 00095 */ 00096 int receive(void); 00097 00098 /** Retrieve data from receive buffer as slave 00099 * 00100 * @returns 00101 * the data in the receive buffer 00102 */ 00103 int read(void); 00104 00105 /** Fill the transmission buffer with the value to be written out 00106 * as slave on the next received message from the master. 00107 * 00108 * @param value the data to be transmitted next 00109 */ 00110 void reply(int value); 00111 00112 protected: 00113 spi_t _spi; 00114 00115 int _bits; 00116 int _mode; 00117 int _hz; 00118 }; 00119 00120 } // namespace mbed 00121 00122 #endif 00123 00124 #endif
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