John Kemp / mcp3208

A library to interface to the MCP3208 SPI-based ADC from Microchip. This chip provides eight analogue inputs, providing converted 12-bit values via SPI.

Dependents:   Nucleo_MCP3208_Test Nucleo_MCP3208_Ticker_Test BBMv2_eps ref_BBMv2_eps ... more

Diff: mcp3208.cpp

Revision:
2:93009a423b45
Parent:
1:316f86115221
Child:
3:e7de500b1f2d
diff -r 316f86115221 -r 93009a423b45 mcp3208.cpp
--- a/mcp3208.cpp	Tue May 24 13:58:00 2011 +0000
+++ b/mcp3208.cpp	Tue May 24 14:06:57 2011 +0000
@@ -1,57 +1,57 @@
-#include "mcp3208.h"
-
-
-#define START_BIT   0x04
-#define MODE_SINGLE 0x02    // Single-ended mode
-#define MODE_DIFF   0x00    // Differential mode
-
-
-MCP3208::MCP3208(SPI bus, PinName cs)
-    : m_cs(cs), m_bus(bus)
-{}
-
-MCP3208::~MCP3208() {}
-
-
-void MCP3208::select() {m_cs = 0;}
-void MCP3208::deselect() {m_cs = 1;}
-
-
-float MCP3208::read_input(int channel)
-{
-    int command_high = START_BIT | MODE_SINGLE | ((channel & 0x04) >> 2);
-    int command_low = (channel & 0x03) << 6;
-
-    select();
-    
-    // Odd writing requirements, see the datasheet for details
-    m_bus.write(command_high);
-    int high_byte = m_bus.write(command_low) & 0x0F;
-    int low_byte = m_bus.write(0);
-    
-    deselect();
-    
-    int conv_result = (high_byte << 8) | low_byte;
-    
-    return float(conv_result) / 4096;
-}
-
-
-float MCP3208::read_diff_input(int channel, Polarity polarity)
-{
-    int command_high = START_BIT | MODE_DIFF | ((channel & 0x02) >> 1);
-    int command_low = ((channel & 0x01) << 7) | (polarity << 6);
-
-    select();
-    
-    // Odd writing and reading requirements, see the datasheet for details.
-    m_bus.write(command_high);
-    int high_byte = m_bus.write(command_low) & 0x0F;
-    int low_byte = m_bus.write(0);
-    
-    deselect();
-    
-    int conv_result = (high_byte << 8) | low_byte;
-    
-    return float(conv_result) / 4096;
-}
+#include "mcp3208.h"
+
+
+#define START_BIT   0x04
+#define MODE_SINGLE 0x02    // Single-ended mode
+#define MODE_DIFF   0x00    // Differential mode
+
+
+MCP3208::MCP3208(SPI bus, PinName cs)
+    : m_cs(cs), m_bus(bus)
+{}
+
+MCP3208::~MCP3208() {}
+
+
+void MCP3208::select() {m_cs = 0;}
+void MCP3208::deselect() {m_cs = 1;}
+
+
+float MCP3208::read_input(int channel)
+{
+    int command_high = START_BIT | MODE_SINGLE | ((channel & 0x04) >> 2);
+    int command_low = (channel & 0x03) << 6;
+
+    select();
+    
+    // Odd writing requirements, see the datasheet for details
+    m_bus.write(command_high);
+    int high_byte = m_bus.write(command_low) & 0x0F;
+    int low_byte = m_bus.write(0);
+    
+    deselect();
+    
+    int conv_result = (high_byte << 8) | low_byte;
+    
+    return float(conv_result) / 4096;
+}
+
+
+float MCP3208::read_diff_input(int channel, Polarity polarity)
+{
+    int command_high = START_BIT | MODE_DIFF | ((channel & 0x02) >> 1);
+    int command_low = ((channel & 0x01) << 7) | (polarity << 6);
+
+    select();
+    
+    // Odd writing and reading requirements, see the datasheet for details.
+    m_bus.write(command_high);
+    int high_byte = m_bus.write(command_low) & 0x0F;
+    int low_byte = m_bus.write(0);
+    
+    deselect();
+    
+    int conv_result = (high_byte << 8) | low_byte;
+    
+    return float(conv_result) / 4096;
+}