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      1 /*
      2  * Author: Yevgeniy Kiveisha <yevgeniy.kiveisha (at) intel.com>
      3  * Copyright (c) 2014 Intel Corporation.
      4  *
      5  * Permission is hereby granted, free of charge, to any person obtaining
      6  * a copy of this software and associated documentation files (the
      7  * "Software"), to deal in the Software without restriction, including
      8  * without limitation the rights to use, copy, modify, merge, publish,
      9  * distribute, sublicense, and/or sell copies of the Software, and to
     10  * permit persons to whom the Software is furnished to do so, subject to
     11  * the following conditions:
     12  *
     13  * The above copyright notice and this permission notice shall be
     14  * included in all copies or substantial portions of the Software.
     15  *
     16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     17  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     18  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     19  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
     20  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
     21  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
     22  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     23  */
     24 
     25 #include <iostream>
     26 #include <string>
     27 #include <stdexcept>
     28 #include <unistd.h>
     29 #include <stdlib.h>
     30 
     31 #include "my9221.h"
     32 
     33 using namespace upm;
     34 
     35 MY9221::MY9221 (uint8_t di, uint8_t dcki)
     36                     : m_clkPinCtx(dcki), m_dataPinCtx(di) {
     37     mraa::Result error = mraa::SUCCESS;
     38 
     39     // set direction (out)
     40     error = m_clkPinCtx.dir(mraa::DIR_OUT);
     41     if (error != mraa::SUCCESS) {
     42         mraa::printError(error);
     43     }
     44 
     45     // set direction (out)
     46     error = m_dataPinCtx.dir(mraa::DIR_OUT);
     47     if (error != mraa::SUCCESS) {
     48         mraa::printError(error);
     49     }
     50 }
     51 
     52 mraa::Result
     53 MY9221::setBarLevel (uint8_t level, bool direction) {
     54     if (level > 10) {
     55         return mraa::ERROR_INVALID_PARAMETER;
     56     }
     57 
     58     send16bitBlock (CMDMODE);
     59     if (direction) {
     60         level += 3;
     61         for(uint8_t block_idx = 12; block_idx > 0; block_idx--) {
     62             uint32_t state = (block_idx < level) ? BIT_HIGH : BIT_LOW;
     63             send16bitBlock (state);
     64         }
     65     } else {
     66         for(uint8_t block_idx = 0; block_idx < 12; block_idx++) {
     67             uint32_t state = (block_idx < level) ? BIT_HIGH : BIT_LOW;
     68             send16bitBlock (state);
     69         }
     70     }
     71     return lockData ();
     72 }
     73 
     74 mraa::Result
     75 MY9221::lockData () {
     76     mraa::Result error = mraa::SUCCESS;
     77     error = m_dataPinCtx.write(LOW);
     78     usleep(100);
     79 
     80     for(int idx = 0; idx < 4; idx++) {
     81         error = m_dataPinCtx.write(HIGH);
     82         error = m_dataPinCtx.write(LOW);
     83     }
     84     return error;
     85 }
     86 
     87 mraa::Result
     88 MY9221::send16bitBlock (short data) {
     89     mraa::Result error = mraa::SUCCESS;
     90     for (uint8_t bit_idx = 0; bit_idx < MAX_BIT_PER_BLOCK; bit_idx++) {
     91         uint32_t state = (data & 0x8000) ? HIGH : LOW;
     92         error = m_dataPinCtx.write(state);
     93         state = m_clkPinCtx.read();
     94 
     95         if (state) {
     96             state = LOW;
     97         } else {
     98             state = HIGH;
     99         }
    100 
    101         error = m_clkPinCtx.write(state);
    102 
    103         data <<= 1;
    104     }
    105     return error;
    106 }
    107