Diff: LTC2601.cpp

Revision:

0:11d039b90bde

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
+}