Diff: SWSPI_BI.cpp

Revision:

0:9efb460e962b

Child:

1:01459a6ab296

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SWSPI_BI.cpp	Tue Sep 23 08:25:23 2014 +0000
@@ -0,0 +1,120 @@
+/* SWSPI, Software SPI library
+ * Copyright (c) 2012-2014, David R. Van Wagner, http://techwithdave.blogspot.com
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+ /* 
+  * modified the software for adapt to the AD9249 ADC  ( bi directional ) with LVDS interface 
+    
+    
+ */ 
+
+#include <mbed.h>
+#include "SWSPI_BI.h"
+#include "S_SCTRL_SM1_hwfunct.h"
+
+/** 
+    PARAM
+    @misopin pointer to the input / output pin for the data communication
+    @rdir_pin  pointer to the output pin that sets the remote LVDS buffer to read / write 
+    @ldir_pin  pointer to the output pin that sets the local  LVDS buffer to read / write  
+    @sclk_pin  pointer to the output pin that act as the clock signal for the interface 
+    
+*/
+SWSPI_BI::SWSPI_BI(DigitalInOut *msio_pin, DigitalOut *rdir_pin,DigitalOut *ldir_pin, DigitalOut *sclk_pin) {
+    
+    msio = msio_pin;
+    rdir = rdir_pin;
+    ldir = ldir_pin;
+    sclk = sclk_pin;
+    set_bi_spi_mo(1, msio,ldir,rdir);
+    
+    format(8);
+    frequency(500000);
+}
+
+SWSPI_BI::~SWSPI_BI()
+{
+}
+
+void SWSPI_BI::format( int bitsin, int modein ){
+    bits = bitsin;
+    mode = modein;
+    polarity = !((modein >> 1) & 1);
+    phase = modein & 1;
+    sclk->write(polarity);
+}
+
+void SWSPI_BI::frequency(int hz)
+{
+    this->freq = hz;
+}
+
+void  SWSPI_BI::write(unsigned int value, DigitalOut * cs, bool lastdata, int cs_pol,bool nxtrd ){
+
+    // write data to output 
+    // assumption is that the cs line was just set from high to low so that the SPI slave is in read mode 
+        value= ~value;    
+        set_bi_spi_mo(1,msio,ldir,rdir);        
+        cs->write(cs_pol); 
+        for (int bit = bits-1; bit >= 0; --bit)    {
+            msio->write(((value >> bit) & 0x01) != 0);
+            if(phase) {   sclk->write(!polarity);   wait(1.0/freq/2); sclk->write(polarity); 
+                    if(!bit and nxtrd) set_bi_spi_mo(0,msio,ldir,rdir); // set already to input mode 
+                     wait(1.0/freq/2);    }
+            else  { wait(1.0/freq/2);  sclk->write(!polarity);  wait(1.0/freq/2);  sclk->write(polarity);      }
+          
+          
+        }
+        if( lastdata) {
+            set_bi_spi_mo(0,msio,ldir,rdir); 
+            cs->write(!cs_pol); 
+        }
+        else {
+        }
+}        
+
+unsigned int  SWSPI_BI::read( DigitalOut * cs, bool lastdata, int cs_pol ){
+    unsigned int read = 0;    
+    set_bi_spi_mo(0,msio,ldir,rdir);        
+    cs->write(cs_pol); 
+    wait(1.0/freq/2);
+    for (int bit = bits-1; bit >= 0; --bit)  {
+        if (phase == 0) {
+            if (msio->read())  read |= (1 << bit);
+               
+        }
+        sclk->write(!polarity);
+        wait(1.0/freq/2);
+        if (phase == 1) {
+            if (msio->read()) read |= (1 << bit);            
+        }
+
+        sclk->write(polarity);
+        wait(1.0/freq/2);
+    }
+    if( lastdata) {    
+            cs->write(!cs_pol); 
+    }
+    // else keep current io config 
+   
+    
+    return ~read;
+}
+