TestShiftreg.cpp

00001 /*
00002  *  Copyright 2013 Embedded Artists AB
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 
00017 /******************************************************************************
00018  * Includes
00019  *****************************************************************************/
00020 
00021 #include "mbed.h"
00022 #include "TestShiftreg.h"
00023 
00024 /******************************************************************************
00025  * Defines and typedefs
00026  *****************************************************************************/
00027 
00028 
00029 /******************************************************************************
00030  * Public Functions
00031  *****************************************************************************/
00032 
00033 TestShiftreg::TestShiftreg(PinName mosi, PinName miso, PinName sclk, PinName cs) :
00034     _spi(mosi, miso, sclk), _cs(cs) {
00035         
00036     _cs = 1; // to get it in a known state
00037     output(0x00);
00038 }
00039 
00040 bool TestShiftreg::runTest() {
00041     output(0x1);
00042     wait(0.1);
00043     output(0x2);
00044     wait(0.1);
00045     output(0x4);
00046     wait(0.1);
00047     output(0x8);
00048     wait(0.1);
00049     output(0x10);
00050     wait(0.1);
00051     output(0x20);
00052     wait(0.1);
00053     output(0x40);
00054     wait(0.1);
00055     output(0x80);
00056     wait(0.1);
00057     output(0x40);
00058     wait(0.1);
00059     output(0x20);
00060     wait(0.1);
00061     output(0x10);
00062     wait(0.1);
00063     output(0x8);
00064     wait(0.1);
00065     output(0x4);
00066     wait(0.1);
00067     output(0x2);
00068     wait(0.1);
00069     output(0x1);
00070     wait(0.1);
00071     output(0x0);
00072     return true;
00073 }
00074 
00075 void TestShiftreg::output(uint8_t value) {
00076     _cs = 0;
00077     _spi.write(value);
00078     _cs = 1;
00079 }
00080