Diff: MAX7221/Max7221.cpp

Revision:

3:5abc4047af8d

Parent:

2:828c62cc1861

Child:

4:e2b160410338

--- a/MAX7221/Max7221.cpp	Wed Aug 07 02:15:17 2013 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,272 +0,0 @@
-/**
-* @file Max7221.cpp
-* @brief This file defines the Max7221 class methods and the default values for static variables
-* 
-* @author Dwayne S. Dilbeck
-*
-* @date 8/6/2013
-*/
-#include "mbed.h"
-#include "Max7221.h"
-
-///Intialize the Class static members
-///Devices used per SPI bus are set to ZERO
-int Max7221::maxInUseSPI1 = 0;
-int Max7221::maxInUseSPI2 = 0;
-///Set the static pointers to the SPI busses to NULL
-SPI *Max7221::spi1=NULL;
-SPI *Max7221::spi2=NULL;
-///Set the static pointers to the load signals to NULL
-DigitalOut *Max7221::load1=NULL;
-DigitalOut *Max7221::load2=NULL;
-
-/**
-*  Constructor. This is the default constructor
-*  @author Dwayne S. Dilbeck
-*  @param msoi  The SPI pin used as input to the device.       Valid values for LPC1768 are p5 or p11
-*  @param mclk  The SPI pin used as clock for the device.      Valid values for LPC1768 are p7 or p13
-*  @param load  The pin used to control load for the device.   Any pin capable for DigitalOut can be used, but the same load pin must be used for 
-*    device that share the same msoi and mclk pins
-*  @date 8/6/2013
-*/
-Max7221::Max7221(PinName msoi, PinName mclk, PinName load){
-   ///Determine which bus we are connecting the device to based on the MSOI pin name
-   switch (msoi) {
-     ///If using SPI bus #1
-     case p5: maxInUseSPI1++; 
-              ///Set this insctance to pointers to the correct static pointers
-              this->id=maxInUseSPI1;
-              this->maxInUse=&maxInUseSPI1;
-              ///If no devices have been assigned to the SPI bus it must be initialized
-              if (spi1 ==NULL) {
-                 spi1 = new SPI(msoi, NC, mclk);
-                 load1 = new DigitalOut(load);
-              } else {
-                ///TODO: Check that load pin is the same for all SP2 
-              }
-              this->max72_spi=spi1;
-              this->load = load2;
-              break;
-     ///If using SPI bus #2
-     case p11: maxInUseSPI2++;  
-              ///Set this insctance to pointers to the correct static pointers
-              this->id=maxInUseSPI2;
-              this->maxInUse=&maxInUseSPI2;
-              ///If no devices have been assigned to the SPI bus it must be initialized
-              if (spi2 ==NULL) {
-                 spi2 = new SPI(msoi, NC, mclk);
-                 load2 = new DigitalOut(load);
-              } else {
-                ///TODO: Check that load pin is the same for all SP2 
-              }
-              this->max72_spi=spi2;
-              this->load = load2;
-              break; 
-     ///If a pin not belonging to a SPI bus is used, Throw error
-     default: error("Not a SPI port");
-   }
-   
-}
-
-/**
-*  This method is used to write a byte of data to a specified register for only the device defined in this class instance
-*  @author Dwayne S. Dilbeck
-*  @param reg  The register to write to.
-*  @param data The value to be written.
-*  @date 8/6/2013   
-*//**
-*  This method is used to write a byte of data to a specified register for only the device defined in this class instance
-*  @author Dwayne S. Dilbeck
-*  @param reg  The register to write to.
-*  @param data The value to be written.
-*  @date 8/6/2013   
-*/
-void Max7221::Write( unsigned int reg, unsigned int data) {
-    int c = 0;
-    *load = LOW;
-
-    ///if there are multiple devices sharing the SPI buss and they preceed the current device in the cascade Write a NOOP to them
-    for ( c = *maxInUse; c > this->id; c--) {
-        max72_spi->write(0);  // no-op
-        max72_spi->write(0);  // no-op
-    }
-    ///Write to this device registers
-    max72_spi->write(reg);  // specify register
-    max72_spi->write(data);  // put data
-
-    ///if there are multiple devices sharing the SPI buss and they follow the current device in the cascade Write a NOOP to them
-    for ( c=this->id-1; c >= 1; c--) {
-        max72_spi->write(0);  // no-op
-        max72_spi->write(0);  // no-op
-    }
-    *load = HIGH;
-}
-
-/**
-*  This method is used to write an  intial set off values to the device to prepare it for use.
-*  @author Dwayne S. Dilbeck
-*  @date 8/6/2013   
-*/   
-void Max7221::Setup () {
-    // initiation of the max 7221
-    // SPI setup: 8 bits, mode 0
-    max72_spi->format(8, 0);
-    
-    // going by the datasheet, min clk is 100ns so theoretically 10MHz should work...
-    max72_spi->frequency(10*MHZ);
-    
-    Write(max7219_reg_scanLimit, 0x07);   ///ENABLE all 8 digits
-    Write(max7219_reg_decodeMode, 0xff);  // Turn on Code B font decode for all digits
-    Write(max7219_reg_shutdown, 0x01);    // Disable shutdown mode
-    Write(max7219_reg_displayTest, 0x00); // Disable display test
-    for (int e=1; e<=8; e++) {            // Write blank to all digits
-        Write(e,0xf);
-    }
-    Write(max7219_reg_intensity, 0x01 );    // Set the display intensity to a low level. 
-                                                  // range: 0x00 to 0x0f
-}
-
-/**
-*  This method is used to write a byte of data to a specified register for all the devices instantiated.
-*  @author Dwayne S. Dilbeck
-*  @param reg  The register to write to.
-*  @param data The value to be written.
-*  @date 8/6/2013   
-*/   
-void Max7221::WriteAll (unsigned int reg, unsigned int data) {   
-    ///Write to all the devices on SPI Bus #1 first
-    if(load1 !=NULL) {
-        *load1 = LOW;                    // begin
-        for ( int c=1; c<= maxInUseSPI1; c++) {
-            spi1->write(reg);  // specify register
-            spi1->write(data);  // put data
-        }
-        *load1 = HIGH;
-    }
-    ///Write to all the devices on SPI Bus #2
-    if(load2 !=NULL) {
-        *load2 = LOW;
-        for ( int c=1; c<= maxInUseSPI2; c++) {
-            spi2->write(reg);  // specify register
-            spi2->write(data);  // put data
-        }
-        *load2 = HIGH;
-    }
-}
-/**
-*  This method is used to display an integer to the specified device instance. Underflow and overflow result in '-' written to all digits
-*  @author Dwayne S. Dilbeck
-*  @param value  An integer value to display
-*  @date 8/6/2013   
-*/   
-void Max7221::WriteInt( int value ){
-  char buffer[16];
-   
-  ///TODO:SET UPPERBOUND AND LOWERBOUND based on NUMDIGITS
-  ///Check the the INT value can be displayed and convert to a string.
-  if (value <= UPPERBOUND && value >= LOWERBOUND) {
-     sprintf(buffer,"%8d",value);
-  } else {
-     sprintf(buffer,"--------");
-  } 
-  ///In case a program changed the decode mode, set it again.
-  Write(max7219_reg_decodeMode, 0xff);
-  for (int i=0;i<NUMDIGITS;i++) {
-       ///For each character of the string, convert the ASCII to the datacode needed by the device
-       switch(buffer[i]){
-           case 0x2d: buffer[i]=0xa; break;
-           case 0x20: buffer[i]=0xf; break;
-           default: buffer[i]= buffer[i] & 0x0f;
-       }
-       ///Call function to write the data for each character of the srting.
-       Write(NUMDIGITS-i,buffer[i]);
-  }
-}
-
-/**
-*  This method is used to display a floating point number to the specified device instance. 
-*   Underflow and overflow result in '-' written to all digits. The digits after the decimal 
-*   point are truncated to fit the display.
-*  @author Dwayne S. Dilbeck
-*  @param value  A float value to display
-*  @date 8/6/2013   
-*/   
-void Max7221::WriteFloat( float value ){
-  char buffer[32];
-  int ptr=-1,len;
-  int i;
- 
-  sprintf(buffer,"%f",value);
-  len=strlen(buffer);
-  i=len-1;
-  while(buffer[i]==0x30) {
-     buffer[i]='\0';
-     i--;
-     len--;
-  }
-  for( i =0; i<=len; i++) {
-      switch(buffer[i]){
-               case 0x2d: buffer[i]=0xa; break;
-               case 0x20: buffer[i]=0xf; break;
-               case 0x2e: buffer[i]=buffer[i-1] | 0x80;
-                           ptr = i-1;
-                           break;
-               default: buffer[i]= buffer[i];
-      }       
-      if (ptr != -1) {
-        buffer[i-1]=buffer[i]; 
-     }
-  }
-     
-  len=strlen(buffer);
-  Write(max7219_reg_decodeMode, 0xff);
-
-  // If too large for display set to '-'
-  if(len > NUMDIGITS && (ptr==-1 || ptr>NUMDIGITS))
-        for (int i=0;i<NUMDIGITS;i++) {
-           buffer[i]=0x0a;
-        }
-  //if number is smaller than display, fill with ' '      
-  if (len<=NUMDIGITS) { 
-      for (int i=1;i<=NUMDIGITS;i++) {
-           if(len-i>=0) {
-             Write(i,buffer[len-i]);
-           } else {
-             Write(i,0xf);   
-           }
-      }
-  } else {
-  //Write out the buffer, truncating the decimal digits if larger than display
-      for (int i=0;i<NUMDIGITS;i++) {
-          Write(NUMDIGITS-i,buffer[i]);
-      }
-  }
-}
-
-/**
-*  This method is used to write an intial set off values to ALL device to prepare them for use.
-*  @author Dwayne S. Dilbeck
-*  @date 8/6/2013   
-*/   
-void Max7221::SetupAll () {
-    // initiation of the max 7219
-    // SPI setup: 8 bits, mode 0
-    if(spi1!=NULL) {
-       spi1->format(8, 0);
-       spi1->frequency(10*MHZ);    
-    }        
-    if(spi2!=NULL) {
-       spi2->format(8, 0);
-       spi2->frequency(10*MHZ);    
-    }        
-    WriteAll(max7219_reg_scanLimit, 0x07);
-    WriteAll(max7219_reg_decodeMode, 0xff);  // using an led matrix (not digits)
-    WriteAll(max7219_reg_shutdown, 0x01);    // not in shutdown mode
-    WriteAll(max7219_reg_displayTest, 0x00); // no display test
-    for (int e=1; e<=8; e++) {            // empty registers, turn all LEDs off
-        WriteAll(e,0xf);
-    }
-    WriteAll(max7219_reg_intensity, 0x01 & 0x0f);    // the first 0x0f is the value you can set
-                                                  // range: 0x00 to 0x0f
-}
-