Mederic Melard / ADS1248

ADS1246/7/8 24bit ADC converter for Temperature Sensors class

Files at this revision

API Documentation at this revision

Revision 1:d62be7487e9d, committed 2016-01-19

Comitter:
mederic
Date:
Tue Jan 19 07:52:07 2016 +0000
Parent:
0:e015f99b8dfb
Commit message:
Increase hold time before & after release the CS pin

Changed in this revision

ADS1248.cpp Show annotated file Show diff for this revision Revisions of this file 
diff -r e015f99b8dfb -r d62be7487e9d ADS1248.cpp
--- a/ADS1248.cpp	Wed Sep 17 08:20:38 2014 +0000
+++ b/ADS1248.cpp	Tue Jan 19 07:52:07 2016 +0000
@@ -1,5 +1,7 @@
 #include "ADS1248.h"
 
+#define ADS1248_HOLD_TIME_US        2
+
 //***********************************/************************************
 //                         Constructors                                 //
 //***********************************/************************************
@@ -28,8 +30,9 @@
     _start = 1;
     _cs = 0;
     _spi.write(en<<1);
-    wait_us(1);
+    wait_us(ADS1248_HOLD_TIME_US);
     _cs = 1;
+    wait_us(ADS1248_HOLD_TIME_US);
     waitReady();
 }
 
@@ -38,16 +41,18 @@
     _cs = 0;
     _spi.write(SYNC);
     _spi.write(SYNC);
-    wait_us(1);
-    _cs = 1;   
+    wait_us(ADS1248_HOLD_TIME_US);
+    _cs = 1;
+    wait_us(ADS1248_HOLD_TIME_US);   
 }
 
 void ADS1248::reset(void){
     _start = 1;  
     _cs = 0;
     _spi.write(RESET);
-    wait_us(1);
-    _cs = 1; 
+    wait_us(ADS1248_HOLD_TIME_US);
+    _cs = 1;
+    wait_us(ADS1248_HOLD_TIME_US); 
     wait_us(600);    
 }
 
@@ -63,9 +68,9 @@
     data |=((_spi.write(0)<< 8)&0x0000FF00);
     data >>= 8;
     data &= 0xfffffff8;
-    wait_us(1);
+    wait_us(ADS1248_HOLD_TIME_US);
     _cs = 1;
-    wait_us(1);
+    wait_us(ADS1248_HOLD_TIME_US);
     return data;
 }
 
@@ -81,9 +86,10 @@
     _spi.write(len-1);
     while(len--){
         *(buff++) = _spi.write(0);
-    }wait_us(1);
+    }
+    wait_us(ADS1248_HOLD_TIME_US);
     _cs = 1;
-    wait_us(1);
+    wait_us(ADS1248_HOLD_TIME_US);
 }
 
 unsigned char ADS1248::readReg(unsigned char reg){
@@ -99,9 +105,10 @@
     _spi.write(len-1);
     while(len--){
         _spi.write(*(buff++));
-    }wait_us(1);
+    }
+    wait_us(ADS1248_HOLD_TIME_US);
     _cs = 1;
-    wait_us(1);
+    wait_us(ADS1248_HOLD_TIME_US);
 }
 
 void ADS1248::writeReg(unsigned char reg, unsigned char val){
@@ -112,8 +119,9 @@
     _start = 1;
     _cs = 0;
     _spi.write(SYSOCAL);
-    wait_us(1);
+    wait_us(ADS1248_HOLD_TIME_US);
     _cs = 1;
+    wait_us(ADS1248_HOLD_TIME_US);
     waitReady();
 }
 
@@ -121,8 +129,9 @@
     _start = 1;
     _cs = 0;
     _spi.write(SYSGCAL);
-    wait_us(1);
+    wait_us(ADS1248_HOLD_TIME_US);
     _cs = 1;
+    wait_us(ADS1248_HOLD_TIME_US);
     waitReady();  
 }
 
@@ -130,7 +139,7 @@
     _start = 1;
     _cs = 0;
     _spi.write(SELFOCAL);
-    wait_us(1);
+    wait_us(ADS1248_HOLD_TIME_US);
     _cs = 1;
     waitReady();
 }