Sakai Ritaro
/
MCP4922
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Revision 0:2e338068a5a7, committed 2019-08-05
- Comitter:
- ritarosakai
- Date:
- Mon Aug 05 03:53:01 2019 +0000
- Child:
- 1:6c010acaae66
- Commit message:
- Initial Commit
Changed in this revision
| MCP4922.cpp | Show annotated file Show diff for this revision Revisions of this file |
| MCP4922.h | Show annotated file Show diff for this revision Revisions of this file |
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/MCP4922.cpp Mon Aug 05 03:53:01 2019 +0000
@@ -0,0 +1,31 @@
+#include "MCP4922.h"
+#include "mbed.h"
+
+MCP4922::MCP4922(PinName MOSI,PinName MISO,PinName SCK,PinName CS,PinName LDAC):
+ dac_SPI(MOSI,MISO,SCK),dac_cs(CS),dac_l(LDAC)
+{
+ dac_SPI.format(16,0);
+ dac_SPI.frequency(20000000);
+ dac_cs=1;
+ dac_l=1;
+}
+
+void MCP4922::write(int ch,float value)
+{
+ if(value<0) {
+ value=0;
+ } else if(value>1) {
+ value=1;
+ }
+ dac_cs=0;
+ int data;
+ if(ch==0) {
+ data=(0b0011<<12)|(int)(value*0xFFF);
+ } else if(ch==1) {
+ data=(0b1011<<12)|(int)(value*0xFFF);
+ }
+ dac_SPI.write(data);
+ dac_cs=1;
+ dac_l=0;
+ dac_l=1;
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/MCP4922.h Mon Aug 05 03:53:01 2019 +0000
@@ -0,0 +1,12 @@
+#include "mbed.h"
+
+class MCP4922
+{
+public:
+ MCP4922(PinName MOSI,PinName MISO,PinName SCK,PinName CS,PinName LDAC);
+ void write(int ch,float value);
+private:
+ SPI dac_SPI;
+ DigitalOut dac_cs;
+ DigitalOut dac_l;
+};