Diff: Max7221.cpp

Revision:

6:191569a26f50

Parent:

5:1f3dbf38d027

Child:

7:a160cb7cdd86

--- a/Max7221.cpp	Thu Nov 19 23:27:53 2015 +0000
+++ b/Max7221.cpp	Thu Nov 19 23:58:07 2015 +0000
@@ -11,14 +11,11 @@
 
 ///Intialize the Class static members
 ///Devices used per SPI bus are set to ZERO
-int Max7221::maxInUseSPI1 = 0;
-int Max7221::maxInUseSPI2 = 0;
+int Max7221::maxInUseSPI = 0;
 ///Set the static pointers to the SPI busses to NULL
-SPI *Max7221::spi1=NULL;
-SPI *Max7221::spi2=NULL;
+SPI *Max7221::spi=NULL;
 ///Set the static pointers to the load signals to NULL
-DigitalOut *Max7221::load1=NULL;
-DigitalOut *Max7221::load2=NULL;
+DigitalOut *Max7221::cs=NULL;
 
 /**
 *  Constructor. This is the default constructor
@@ -30,42 +27,16 @@
 *  @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 PTC6: 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 = load1;
-              break;
-     ///If using SPI bus #2
-     case PTD7: 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");
-   }
-   
+  ///Set this insctance to pointers to the correct static pointers
+  this->id=maxInUseSPI;
+  this->maxInUse=&maxInUseSPI;
+  ///If no devices have been assigned to the SPI bus it must be initialized
+  if (spi ==NULL) {
+     spi = new SPI(msoi, NC, mclk);
+     cs = new DigitalOut(load);
+  }
+  this->max7221_spi= spi;
+  this->max7221_cs = cs;
 }
 
 /**
@@ -83,23 +54,23 @@
 */
 void Max7221::Write( unsigned int reg, unsigned int data) {
     int c = 0;
-    *load = LOW;
+    *cs = 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
+        max7221_spi->write(0);  // no-op
+        max7221_spi->write(0);  // no-op
     }
     ///Write to this device registers
-    max72_spi->write(reg);  // specify register
-    max72_spi->write(data);  // put data
+    max7221_spi->write(reg);  // specify register
+    max7221_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
+        max7221_spi->write(0);  // no-op
+        max7221_spi->write(0);  // no-op
     }
-    *load = HIGH;
+    *cs = HIGH;
 }
 
 /**
@@ -110,10 +81,10 @@
 void Max7221::Setup () {
     // initiation of the max 7221
     // SPI setup: 8 bits, mode 0
-    max72_spi->format(8, 0);
+    max7221_spi->format(8, 0);
     
     // going by the datasheet, min clk is 100ns so theoretically 10MHz should work...
-    max72_spi->frequency(10*MHZ);
+    max7221_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
@@ -135,22 +106,13 @@
 */   
 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
+    if(cs !=NULL) {
+        *cs = LOW;                    // begin
+        for ( int c=1; c<= maxInUseSPI; c++) {
+            spi->write(reg);  // specify register
+            spi->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;
+        *cs = HIGH;
     }
 }
 /**
@@ -251,14 +213,10 @@
 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);    
-    }        
+    if(spi!=NULL) {
+       spi->format(8, 0);
+       spi->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