Yann Garcia / MCP4xxxx_SPI

Simplified access to a Microchip Digital Potentiometer (MCP41xxx/MCP42xxx) devices

Dependents:   MCP41xxxApp MCP320xApp MCP41xxxApp

Files at this revision

API Documentation at this revision

Revision 4:bbfc8e352ff5, committed 2013-02-04

Comitter:
Yann
Date:
Mon Feb 04 17:15:33 2013 +0000
Parent:
3:0acab5201dd8
Child:
5:4f6133144e7e
Commit message:
Change wrong comments

Changed in this revision

MCP4xxxx_SPI.cpp Show annotated file Show diff for this revision Revisions of this file 
--- a/MCP4xxxx_SPI.cpp	Sat Feb 02 10:15:25 2013 +0000
+++ b/MCP4xxxx_SPI.cpp	Mon Feb 04 17:15:33 2013 +0000
@@ -1,4 +1,4 @@
-/* mbed simplified access to Microchip 24LCxx Serial EEPROM devices (SPI)
+/* mbed simplified access to Microchip MCP42xxx/MCP41xxx Digital Potentiometer devices (SPI)
  * Copyright (c) 2013 ygarcia, MIT License
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of this software 
@@ -26,14 +26,15 @@
     CMCP4xxxx_SPI::CMCP4xxxx_SPI(const PinName p_mosi, const PinName p_miso, const PinName p_sclk, const PinName p_cs, const PinName p_reset, const PinName p_shdn, const unsigned int p_frequency) : _internalId("") {
         DEBUG_ENTER("CMCP4xxxx_SPI")
 
-        if (CMCP4xxxx_SPI::SPIModuleRefCounter != 0) {
-            error("CMCP4xxxx_SPI: Wrong params");
+        CMCP4xxxx_SPI::SPIModuleRefCounter += 1;
+        if (CMCP4xxxx_SPI::SPIModuleRefCounter > 1) {
+            // Nothing to do
+            return;
         }
 
         _spiInstance = new SPI(p_mosi, p_miso, p_sclk);
         _spiInstance->frequency(p_frequency); // Set the frequency of the SPI interface
         _spiInstance->format(16, 0); // See http://mbed.org/users/mbed_official/code/mbed/docs/0954ebd79f59//classmbed_1_1SPI.html
-        CMCP4xxxx_SPI::SPIModuleRefCounter += 1;
         DEBUG_ENTER("CMCP4xxxx_SPI: refCounter=%d", CMCP4xxxx_SPI::SPIModuleRefCounter)
 
         if (p_cs != NC) {