PCF8576.cpp

00001 /* Copyright (c) 2016 ARM Ltd., MIT License
00002 *
00003 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
00004 * and associated documentation files (the "Software"), to deal in the Software without
00005 * restriction, including without limitation the rights to use, copy, modify, merge, publish,
00006 * distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
00007 * Software is furnished to do so, subject to the following conditions:
00008 *
00009 * The above copyright notice and this permission notice shall be included in all copies or
00010 * substantial portions of the Software.
00011 *
00012 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
00013 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00014 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
00015 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00016 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00017 *
00018 */
00019 #include "PCF8576.h"
00020 
00021 PCF8576::PCF8576(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr)
00022 {
00023     initialize();
00024 }
00025  
00026 PCF8576::PCF8576(I2C &i2c_obj, int addr) : m_i2c(i2c_obj), m_addr(addr)
00027 {
00028     initialize();
00029 }
00030  
00031 PCF8576::~PCF8576()
00032 {
00033 }
00034 
00035 void PCF8576::initialize()
00036 {
00037     m_i2c.frequency(200000);
00038 
00039     for(uint32_t i = 0; i < 14; i++) {
00040         m_lcd_buf[i] = 0;
00041     }
00042     
00043     m_C5_mask = m_C6_mask = 0;
00044 
00045     m_lcd_buf[0]      =  PCF8576_CMD_MODE_SET
00046                        | (0x0 << 0)          // 1:4 multiplex
00047                        | (0   << 2)          // LCD 1/3 bias
00048                        | (1   << 3)          // enable display
00049                        | (1   << 7);         // another command to follow
00050 
00051     m_lcd_buf[1]      =  PCF8576_CMD_BINK
00052                        | (0x0 << 0)          // blinking off
00053                        | (0   << 2)          // blink mode normal
00054                        | (0   << 7);         // last command
00055 
00056     m_i2c.write(PCF8576_DEFAULT_SLAVE_ADDRESS, m_lcd_buf, 14);
00057 
00058 }
00059 
00060 void PCF8576::icon(uint32_t count)
00061 {
00062     if (count & 0x08) {
00063         m_C5_mask     |= 0x01;
00064         m_lcd_buf[11] |= 0x01;
00065     } else {
00066         m_C5_mask     &= ~0x01;
00067         m_lcd_buf[11] &= ~0x01;
00068     }
00069 
00070     if (count & 0x04) {
00071         m_C5_mask     |= 0x02;
00072         m_lcd_buf[11] |= 0x02;
00073     } else {
00074         m_C5_mask     &= ~0x02;
00075         m_lcd_buf[11] &= ~0x02;
00076     }
00077 
00078     if (count & 0x02) {
00079         m_C6_mask     |= 0x01;
00080         m_lcd_buf[13] |= 0x01;
00081     } else {
00082         m_C6_mask     &= ~0x01;
00083         m_lcd_buf[13] &= ~0x01;
00084     }
00085 
00086     if (count & 0x01) {
00087         m_C6_mask     |= 0x02;
00088         m_lcd_buf[13] |= 0x02;
00089     } else {
00090         m_C6_mask     &= ~0x02;
00091         m_lcd_buf[13] &= ~0x02;
00092     }
00093     m_i2c.write(PCF8576_DEFAULT_SLAVE_ADDRESS, m_lcd_buf, 14);
00094 
00095 }
00096 
00097 
00098 void PCF8576::print(char *str)
00099 {
00100     uint32_t len = strlen(str);
00101     if (len == 0)
00102         return;
00103     if (len > 6)
00104         len = 6;
00105 
00106     m_lcd_buf[0] = PCF8576_CMD_DEVICE_SEL | (1 << 7);
00107     m_lcd_buf[1] = PCF8576_CMD_LOAD_DATA;
00108 
00109     for(uint32_t i = 0; i < len; i++) {
00110         m_lcd_buf[(i*2) + 2] = (char)(FontMatrix[(*str - ' ')] & 0xFF);
00111         m_lcd_buf[(i*2) + 3] = (char)(FontMatrix[(*str - ' ')] >> 8);
00112         str++;
00113     }
00114 
00115     m_lcd_buf[11] |= m_C5_mask;
00116     m_lcd_buf[13] |= m_C6_mask;
00117 
00118     m_i2c.write(PCF8576_DEFAULT_SLAVE_ADDRESS, m_lcd_buf, 2 + (len*2));
00119 }