Diff: LS7366.cpp

Revision:

0:c2458154721b

Child:

1:c627734cf04c

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/LS7366.cpp	Tue Dec 09 19:08:46 2014 +0000
@@ -0,0 +1,171 @@
+// LS7366.cpp for Encoder Class Library
+// J. Bradshaw 20141030
+/* Copyright (c) 2014, jbradshaw (http://mbed.org)
+ *
+ * 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.
+ *
+*/ 
+#include "LS7366.h"
+
+//----- LS7366 Encoder/Counter Routines --------------------
+
+//Constructor
+LS7366::LS7366(SPI& spi, PinName cs) : _spi(spi), _cs(cs) {
+    _cs = 1;           // Initialize chip select as off (high)
+    _init();
+}
+
+void LS7366::LS7366_cmd(int inst, int reg){
+    char cmd;
+    
+    _spi.format(8, 0);
+    _spi.frequency(2000000);
+    cmd = (inst << 6) | (reg << 3);
+//    printf("\r\ncmd=0X%2X", cmd);
+    _spi.write(cmd);
+}
+
+long LS7366::LS7366_read_counter(){
+    union bytes{
+        char byte_enc[4];
+        long long_enc;
+    }counter;
+    
+    _spi.format(8, 0);
+    _spi.frequency(2000000);
+
+    _cs = 0;    
+    wait_us(1);
+    LS7366_cmd(LOAD,OTR);//cmd = 0xe8, LOAD to OTR
+    _cs = 1;
+    wait_us(1);
+    
+    _cs = 0;        
+
+    wait_us(1);
+    LS7366_cmd(RD,CNTR);  //cmd = 0x60, READ from CNTR
+    counter.byte_enc[3] = _spi.write(0x00);
+    counter.byte_enc[2] = _spi.write(0x00);
+    counter.byte_enc[1] = _spi.write(0x00);
+    counter.byte_enc[0] = _spi.write(0x00);
+
+    _cs = 1;    
+    
+    count = counter.long_enc;  
+    return counter.long_enc;  //return count
+}
+
+void LS7366::LS7366_quad_mode_x4(){
+    
+    _spi.format(8, 0);
+    _spi.frequency(2000000);
+    
+    _cs = 0;    
+   
+    wait_us(1);
+    LS7366_cmd(WR,MDR0);// Write to the MDR0 register
+    _spi.write(0x03); // X4 quadrature count mode
+
+    _cs = 1;    
+}
+
+void LS7366::LS7366_reset_counter(){
+    
+    _spi.format(8, 0);
+    _spi.frequency(2000000);
+    
+    _cs = 0;    
+   
+    wait_us(1);
+    LS7366_cmd(CLR,CNTR);//Clear the counter register
+
+    _cs = 1;    
+
+    wait_us(1);
+    
+    _cs = 0;    
+            
+    wait_us(1);
+    LS7366_cmd(LOAD,CNTR);//
+
+    _cs = 1;    
+}
+
+void LS7366::LS7366_write_DTR(long enc_value)
+{
+    union bytes
+    {
+        char byte_enc[4];
+        long long_enc;
+    }counter;
+    
+    _spi.format(8, 0);
+    _spi.frequency(2000000);
+    
+    counter.long_enc = enc_value;
+    
+    _cs = 0;    
+   
+    wait_us(1);
+    LS7366_cmd(WR,DTR);//
+    _spi.write(counter.byte_enc[3]);
+    _spi.write(counter.byte_enc[2]);
+    _spi.write(counter.byte_enc[1]);
+    _spi.write(counter.byte_enc[0]);
+
+    _cs = 1;         
+    
+    wait_us(1);
+
+    _cs = 0;    
+
+    wait_us(1);
+    LS7366_cmd(LOAD,CNTR);//
+
+    _cs = 1;    
+}
+
+void LS7366::_init(){
+    _spi.frequency(2000000);
+    LS7366_reset_counter();
+    LS7366_quad_mode_x4();       
+    LS7366_write_DTR(0);    
+}
+
+void LS7366::write(long wcount){
+    LS7366_write_DTR(wcount);    
+}
+
+long LS7366::read(){
+    return LS7366_read_counter();    
+}
+
+LS7366& LS7366::operator= (long wcount) { 
+    write(wcount);
+    return *this;
+}
+ 
+LS7366& LS7366::operator= (LS7366& rhs) {
+    write(rhs.read());
+    return *this;
+}
+
+LS7366::operator long() {
+    return read();    
+}
\ No newline at end of file