Diff: mcp3201.h

Revision:

0:f9b5c272f6ed

diff -r 000000000000 -r f9b5c272f6ed mcp3201.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mcp3201.h	Fri May 06 18:50:55 2016 +0000
@@ -0,0 +1,35 @@
+/*
+    Header for MCP3201 Analog SAR Converter with SPI interface 
+    Version: 1.0
+    Julio S.
+*/
+
+// SPI clock freq. in HZ
+// Limits from MCP3201 datasheet are:
+// 1500000Hz when vdd=5V
+// 800000Hz when vdd=2.7V
+// 1MHz should work and is the default value.
+#define MCP3201_CLK_FREQ    1000000
+
+// MCP3201 SPI channel pinout
+// p5 not wired, there are no commands to send for MCP3201 device
+SPI MCP3201(p5,p6,p7);
+// take control from CS pin to avoid transition changes between write commands
+DigitalOut cs(p8); 
+
+
+// Read the analog value from MCP3201.
+// return 12bit interger (0...4095)
+int ReadAnalogMCP3201(void)
+{
+ //uncommente below line only if the MCP3201_CLK_FREQ is diferrent of 1MHz
+ //MCP3201.frequency(MCP3201_CLK_FREQ);
+ 
+ cs=0;
+ int high_byte = MCP3201.write(0x00);
+ int low_byte = MCP3201.write(0x00);
+ cs=1;
+ int conv_result = ((high_byte & 0x1f) << 7) | ((low_byte >> 1) & 0x7f);  
+
+ return conv_result;
+}
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