Takashi Matsuoka
/
MjAD520x
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Revision 0:1d45c35a717b, committed 2015-10-18
- Comitter:
- matsujirushi
- Date:
- Sun Oct 18 05:12:59 2015 +0000
- Commit message:
- created.
Changed in this revision
| MjAD520x.cpp | Show annotated file Show diff for this revision Revisions of this file |
| MjAD520x.h | Show annotated file Show diff for this revision Revisions of this file |
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/MjAD520x.cpp Sun Oct 18 05:12:59 2015 +0000
@@ -0,0 +1,27 @@
+#include "MjAD520x.h"
+
+MjAD520x::MjAD520x(PinName mosi, PinName miso, PinName sclk, PinName cs_n, int terminalResistance)
+ : HwSpi(mosi, miso, sclk), HwCs_n(cs_n, 1)
+{
+ TerminalResistance = terminalResistance;
+
+ HwSpi.format(11, 0);
+ HwSpi.frequency(1000000);
+}
+
+void MjAD520x::write(int channel, int resistance)
+{
+ write_u8(channel, resistance <= TerminalResistance ? resistance * 255 / TerminalResistance : 255);
+}
+
+void MjAD520x::write_u8(int channel, uint8_t value)
+{
+ HwCs_n.write(0);
+ wait_us(1);
+
+ HwSpi.write(channel << 8 | value);
+
+ HwCs_n.write(1);
+ wait_us(1);
+}
+
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/MjAD520x.h Sun Oct 18 05:12:59 2015 +0000
@@ -0,0 +1,20 @@
+#ifndef MJ_AD520X_H
+#define MJ_AD520X_H
+
+#include "mbed.h"
+
+class MjAD520x
+{
+public:
+ MjAD520x(PinName mosi, PinName miso, PinName sclk, PinName cs_n, int terminalResistance);
+ void write(int channel, int resistance);
+ void write_u8(int channel, uint8_t value);
+
+private:
+ SPI HwSpi;
+ DigitalOut HwCs_n;
+ int TerminalResistance;
+
+};
+
+#endif // MJ_AD520X_H
\ No newline at end of file