L VD / LTC2601

Mbed library for LTC2601 / Mikroe DAC 2 Click peripheral.

Dependents:   LTC2601_test

LTC2601.cpp@0:11d039b90bde, 2020-08-25 (annotated)

Committer:
elelthvd
Date:
Tue Aug 25 14:26:48 2020 +0800
Revision:
0:11d039b90bde
Add LTC2601 library for Mbed OS

Who changed what in which revision?

UserRevisionLine numberNew contents of line
elelthvd 0:11d039b90bde 1 #include "LTC2601.h"
elelthvd 0:11d039b90bde 2 #include "mbed.h"
elelthvd 0:11d039b90bde 3
elelthvd 0:11d039b90bde 4 /* Constructor */
elelthvd 0:11d039b90bde 5 LTC2601::LTC2601 (SPI *spi, PinName cs, PinName rst) : _spi(spi), _cs(cs), _rst(rst) {
elelthvd 0:11d039b90bde 6 _cs = 1; // deselect
elelthvd 0:11d039b90bde 7 _rst = 1; // deselect
elelthvd 0:11d039b90bde 8 _spi->format(16, 0); // 16-bit word length
elelthvd 0:11d039b90bde 9 _spi->frequency(50*1000*1000); // 50 MHz spi clock
elelthvd 0:11d039b90bde 10
elelthvd 0:11d039b90bde 11 };
elelthvd 0:11d039b90bde 12 /* Set DAC voltage 0...5.0V */
elelthvd 0:11d039b90bde 13 void LTC2601::updateVoltage(float voltage) {
elelthvd 0:11d039b90bde 14 uint16_t dac_value = (voltage/5.0) * 0xFFFF;
elelthvd 0:11d039b90bde 15 updateVoltage(dac_value);
elelthvd 0:11d039b90bde 16 }
elelthvd 0:11d039b90bde 17 /* Set DAC voltage 0...0xFFFF */
elelthvd 0:11d039b90bde 18 void LTC2601::updateVoltage(uint16_t dac_value) {
elelthvd 0:11d039b90bde 19 writeRegister(WRITE, dac_value);
elelthvd 0:11d039b90bde 20 }
elelthvd 0:11d039b90bde 21 void LTC2601::powerDown() {
elelthvd 0:11d039b90bde 22 writeRegister(POWERDOWN, NULL);
elelthvd 0:11d039b90bde 23 }
elelthvd 0:11d039b90bde 24 /*
elelthvd 0:11d039b90bde 25 * DAC 2 Click only has no MOSI function
elelthvd 0:11d039b90bde 26 *
elelthvd 0:11d039b90bde 27 * Input First SPI write 16-bit:
elelthvd 0:11d039b90bde 28 * 8 bits of don't care
elelthvd 0:11d039b90bde 29 * 4 bits of command word (C3-C0)
elelthvd 0:11d039b90bde 30 * 4 bits if don't care
elelthvd 0:11d039b90bde 31 *
elelthvd 0:11d039b90bde 32 * Input Second SPI write 16-bit:
elelthvd 0:11d039b90bde 33 * 16 bits of data word (D15-D0)
elelthvd 0:11d039b90bde 34 * This data word encodes the desired DAC value between 0.0V and Vref.
elelthvd 0:11d039b90bde 35 * Vref on the Mikroe DAC2 Click equals 5.0V (jumper default).
elelthvd 0:11d039b90bde 36 *
elelthvd 0:11d039b90bde 37 */
elelthvd 0:11d039b90bde 38 void LTC2601::writeRegister(CommandName command, uint16_t data) {
elelthvd 0:11d039b90bde 39 _cs = 0; // select;
elelthvd 0:11d039b90bde 40 _spi->write(command);
elelthvd 0:11d039b90bde 41 _spi->write(data);
elelthvd 0:11d039b90bde 42 _cs = 1; // deselect;
elelthvd 0:11d039b90bde 43 }
elelthvd 0:11d039b90bde 44 void LTC2601::hwReset() {
elelthvd 0:11d039b90bde 45 _rst = 1; // select
elelthvd 0:11d039b90bde 46 wait_us(10*1000); // wait some milliseconds (test only)
elelthvd 0:11d039b90bde 47 _rst = 1; // deselect
elelthvd 0:11d039b90bde 48 }