Revision 0:11d039b90bde, committed 2020-08-25

Comitter:

elelthvd

Date:

Tue Aug 25 14:26:48 2020 +0800

Commit message:

Add LTC2601 library for Mbed OS

Changed in this revision

diff -r 000000000000 -r 11d039b90bde LTC2601.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/LTC2601.cpp	Tue Aug 25 14:26:48 2020 +0800
@@ -0,0 +1,48 @@
+#include "LTC2601.h"
+#include "mbed.h"
+
+/* Constructor */
+LTC2601::LTC2601 (SPI *spi, PinName cs, PinName rst) : _spi(spi), _cs(cs), _rst(rst) {
+    _cs = 1;  // deselect
+    _rst = 1; // deselect
+    _spi->format(16, 0);          // 16-bit word length
+    _spi->frequency(50*1000*1000); // 50 MHz spi clock
+
+};
+/* Set DAC voltage 0...5.0V */
+void LTC2601::updateVoltage(float voltage) {
+    uint16_t dac_value = (voltage/5.0) * 0xFFFF;
+    updateVoltage(dac_value);
+}
+/* Set DAC voltage 0...0xFFFF */
+void LTC2601::updateVoltage(uint16_t dac_value) {
+    writeRegister(WRITE, dac_value);
+}
+void LTC2601::powerDown() {
+    writeRegister(POWERDOWN, NULL);
+}
+/*
+* DAC 2 Click only has no MOSI function
+*
+* Input First SPI write 16-bit:
+* 8 bits of don't care
+* 4 bits of command word (C3-C0)
+* 4 bits if don't care
+*
+* Input Second SPI write 16-bit: 
+* 16 bits of data word (D15-D0)
+* This data word encodes the desired DAC value between 0.0V and Vref.
+* Vref on the Mikroe DAC2 Click equals 5.0V (jumper default).
+*
+*/
+void LTC2601::writeRegister(CommandName command, uint16_t data) {
+    _cs = 0; //  select;
+    _spi->write(command);
+    _spi->write(data);
+    _cs = 1; //  deselect;
+}
+void LTC2601::hwReset() {
+    _rst = 1; // select
+    wait_us(10*1000);   // wait some milliseconds (test only)
+    _rst = 1; // deselect
+}

diff -r 000000000000 -r 11d039b90bde LTC2601.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/LTC2601.h	Tue Aug 25 14:26:48 2020 +0800
@@ -0,0 +1,57 @@
+
+#ifndef _LTC2601_H
+#define _LTC2601_H
+#include "mbed.h"
+ 
+class LTC2601 {
+public:
+    /** Commands (Table 1): 
+    * C3 C2 C1 C0
+    *  0  0  0  0 Write to Input Register
+    *  0  0  0  1 Update (Power Up) DAC Register
+    *  0  0  1  1 Write to and Update (Power Up)
+    *  0  1  0  0 Power Down (and ignores data word)
+    *  1  1  1  1 No Operation (ignores data word)
+    * The first three commands all seem to have the same effect (update and power up). Commands not shown seem ignored.
+    * 
+    */
+    enum CommandName { 
+        WRITE           = (0b0000<<4),
+        UPDATE          = (0b0001<<4),
+        WRITE_UPDATE    = (0b0011<<4),
+        POWERDOWN       = (0b0100<<4),
+        NOOPERATION     = (0b1111<<4),
+    } ;
+    /* Constructor */
+    LTC2601 (SPI *spi, PinName cs, PinName rst);
+
+    /* Set DAC voltage 0...5.0V */
+    void updateVoltage(float voltage);
+    /* Set DAC voltage 0...0xFFFF */
+    void updateVoltage(uint16_t dac_value);
+    void powerDown();
+    /*
+    * DAC 2 Click only has no MOSI function
+    *
+    * Input First SPI write 16-bit:
+    * 8 bits of don't care
+    * 4 bits of command word (C3-C0)
+    * 4 bits if don't care
+    *
+    * Input Second SPI write 16-bit: 
+    * 16 bits of data word (D15-D0)
+    * This data word encodes the desired DAC value between 0.0V and Vref.
+    * Vref on the Mikroe DAC2 Click equals 5.0V (jumper default).
+    *
+    */
+    void writeRegister(CommandName command, uint16_t data);
+    void hwReset();
+protected:
+private:
+    SPI *_spi;
+    DigitalOut _cs;
+    DigitalOut _rst;
+};
+
+
+#endif  //  _LTC2601_H
\ No newline at end of file