Johnny Yam
simple MCP4XXX digital potentiometer library
datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/22060b.pdf
Diff: MCP4XXX.cpp
- Revision:
- 0:dc2196d5163f
- Child:
- 1:d0bc73e899a3
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/MCP4XXX.cpp Wed Nov 27 06:42:37 2013 +0000
@@ -0,0 +1,30 @@
+#include "MCP4XXX.h"
+
+MCP4XXX::MCP4XXX(PinName miso, PinName mosi, PinName clk, PinName cs) {
+ _cs = new DigitalOut(cs);
+ _spi = new SPI(miso, mosi, clk);
+ _spi->format(8,0);
+ _spi->frequency(1000000);
+ _lvl = 0x00;
+}
+
+MCP4XXX::~MCP4XXX()
+{
+ delete _cs;
+ delete _spi;
+}
+
+void MCP4XXX::setLevel(unsigned char lvl, bool isR0) {
+ *_cs = 0;
+ if (isR0)
+ _spi->write(P0);
+ else
+ _spi->write(P1);
+ _spi->write(lvl);
+ *_cs = 1;
+ _lvl = lvl;
+}
+
+unsigned char MCP4XXX::getLevel() {
+ return _lvl;
+}
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