Diff: DACx578.cpp

Revision:

0:7ebbac9efdb4

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DACx578.cpp	Mon May 14 04:23:31 2018 +0000
@@ -0,0 +1,68 @@
+/*
+ * DAC5578 (8bit)
+ * DAC6578 (10bit)
+ * DAC7578 (12bit)
+ */
+
+#include "DACx578.h"
+
+DACx578::DACx578 (PinName sda, PinName scl, int addr, enum DEVICE device) : _i2c(sda, scl) {
+    _addr = addr;
+    _device = device;
+    init();
+}
+
+DACx578::DACx578 (I2C &i2c, int addr, enum DEVICE device) : _i2c(i2c) {
+    _addr = addr;
+    _device = device;
+    init();
+}
+
+int DACx578::init () {
+    char buf[3];
+
+    buf[0] = 0x70; // reset
+    buf[1] = 0x00;
+    buf[2] = 0x00;
+    if (_i2c.write(_addr, buf, 3)) return -1;
+    wait_ms(10);
+
+    buf[0] = 0x40; // power on
+    buf[1] = 0x1f;
+    buf[2] = 0xe0;
+    if (_i2c.write(_addr, buf, 3)) return -1;
+/*
+    buf[0] = 0x60; // ignore LDAC
+    buf[1] = 0xff;
+    buf[2] = 0x00;
+    if (_i2c.write(_addr, buf, 3)) return -1;
+*/
+    return 0;
+}
+
+int DACx578::write (int channel, int value, int ldac) {
+    char buf[3];
+
+    buf[0] = (ldac ? 0x30 : 0x00) | (channel & 0x0f); // Individual Software LDAC / Input Register
+    buf[1] = (value >> _device) & 0xff;
+    buf[2] = ((8 - value) << _device) & 0xff;
+    return _i2c.write(_addr, buf, 3);
+}
+
+int DACx578::ldacWrite (int channel, int value) {
+    char buf[3];
+
+    buf[0] = 0x20 | (channel & 0x0f); // Global Software LDAC
+    buf[1] = (value >> _device) & 0xff;
+    buf[2] = ((8 - value) << _device) & 0xff;
+    return _i2c.write(_addr, buf, 3);
+}
+
+int DACx578::update (int channel) {
+    char buf[3];
+
+    buf[0] = 0x10 | (channel & 0x0f); // Register Update
+    buf[1] = 0;
+    buf[2] = 0;
+    return _i2c.write(_addr, buf, 3);
+}