ACM1602NI.cpp

00001 //------------------------------------------------------
00002 //  Class for LCD, ACM1602NI
00003 //
00004 //  2014/08/27, Copyright (c) 2014 MIKAMI, Naoki
00005 //------------------------------------------------------
00006 
00007 #include "ACM1602NI.hpp"
00008 
00009 namespace Mikami
00010 {
00011     // Constructor
00012     Acm1602Ni::Acm1602Ni(PinName sda, PinName scl, uint32_t clock,
00013                          bool cursor, bool blink)
00014         : i2c_(sda, scl)
00015     {
00016         uint32_t i2cAddr = 0;
00017         if ( ((sda == PB_9) || (sda == PB_7)) &&
00018              ((scl == PB_8) || (scl == PB_6)) )
00019                     i2cAddr = I2C_1;    // I2C1 will be used
00020         if ( (sda == PB_3) && (scl == PB_10) )
00021                     i2cAddr = I2C_2;    // I2C2 will be used
00022         if ( ((sda == PC_9) || (sda == PB_4)) &&
00023              (scl == PA_8) )
00024                     i2cAddr = I2C_3;    // I2C3 will be used
00025         
00026         i2c_cr1_ = (uint32_t *)i2cAddr;
00027         i2c_dr_  = (uint32_t *)(i2cAddr + 0x10);
00028         i2c_sr1_ = (uint32_t *)(i2cAddr + 0x14);
00029         i2c_sr2_ = (uint32_t *)(i2cAddr + 0x18);
00030 
00031         connected_ = Clear();      // Clear display
00032         if (!connected_) return;
00033         
00034         if (clock != 100000) i2c_.frequency(clock);
00035 
00036         WriteCmd(0x38); // data length：8-bit, 2-line, 5×8 dots
00037         WriteCmd(0x0C | (cursor << 1) | blink);
00038         WriteCmd(0x06); // cursor direction: rightward
00039     }
00040 
00041     // All clear
00042     bool Acm1602Ni::Clear()
00043     {
00044         bool ok = WriteCmd(0x01);
00045         wait_ms(50);
00046         return ok;
00047     }
00048 
00049     // Write string from specified position
00050     void Acm1602Ni::WriteString(const char str[], uint8_t x, uint8_t y)
00051     {
00052         SetXY(x, y);
00053         for (int n=0; n<16; n++)
00054             if (str[n] == 0) break;
00055             else             WriteChar(str[n]);
00056     }
00057 
00058     //------------------------------------------------------------------------------
00059     // Following: private functions
00060 
00061     // Send command and data
00062     bool Acm1602Ni::LcdTx(uint8_t cmdData, uint8_t data)
00063     {
00064         if (!Start()) return false;
00065         TxDR(cmdData);  // "cmdData" defines king of "data" in next statement
00066         TxDR(data);     // Send command or RAM dataspecify specified by "cmdData"
00067         wait_us(500);   // indispensable
00068         SetCR1(0x200);  // Generate stop condition
00069         return true;
00070     }
00071 
00072     // Preparation for send of command and data
00073     bool Acm1602Ni::Start()
00074     {
00075         const uint8_t WAIT = 20;
00076         const uint8_t LENGTH = 10;
00077         uint8_t n;
00078 
00079         // wait for I2C not busy
00080         for (n=0; n<LENGTH; n++)
00081         {
00082             wait_us(WAIT);      
00083             if (!Check(i2c_sr2_, 0x02)) break;
00084         }
00085         if (n == LENGTH) return false;
00086 
00087         // Generate start condition
00088         SetCR1(0x100);
00089         // Confirm start condition and master mode
00090         for (n=0; n<LENGTH; n++)
00091         {
00092             wait_us(WAIT);      
00093             if (Check(i2c_sr1_, 0x01) && Check(i2c_sr2_, 0x03)) break;
00094         }
00095         if (n == LENGTH) return false;
00096 
00097         // Send slave address
00098         TxDR(LCD_ADDRESS_);
00099         // Confirm on transmit mode
00100         for (n=0; n<LENGTH; n++)
00101         {
00102             wait_us(WAIT);      
00103             if (Check(i2c_sr1_, 0x82) && Check(i2c_sr2_, 0x07)) break;
00104         }
00105         if (n == LENGTH) return false;
00106 
00107         return true;
00108     }
00109 }