Diff: ad5668.cpp

Revision:

0:55d636c5638a

Child:

1:b54ba779d19a

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ad5668.cpp	Wed Apr 05 22:15:15 2017 +0000
@@ -0,0 +1,155 @@
+/**
+ * @file ad5668.cpp
+ *
+ * @author Jon Buckman
+ * 
+ * @section LICENSE
+ *
+ * Copyright (c) 2017 Jon Buckman
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU General Public License as published by
+ *    the Free Software Foundation, either version 3 of the License, or
+ *    (at your option) any later version.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU General Public License for more details.
+ *
+ *    You should have received a copy of the GNU General Public License
+ *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * @section DESCRIPTION
+ *
+ * AD5668 Digital to Analog Converter from Analog Devices.
+ *
+ * Datasheet:
+ *
+ * http://www.analog.com/media/en/technical-documentation/data-sheets/AD5668.pdf
+ */
+ 
+/**
+ * Includes
+ */
+#include "ad5668.h"
+
+/**
+ * Defines
+ */
+
+
+/**
+ * Methods
+ */
+AD5668::AD5668(PinName mosi,
+                    PinName miso,
+                    PinName sck, 
+                    PinName csn) : spi_(mosi, miso, sck), nCS_(csn) {
+
+    nCS_ = 1;
+
+    spi_.frequency(AD5668_SPI_MAX_DATA_RATE/5);     // 2Mbit, 1/5th the maximum transfer rate for the SPI bus
+    spi_.format(8,1);                                   // 8-bit, ClockPhase = 0, ClockPolarity = 1
+
+    /* Behaves as a power-on reset. */
+    AD5668_Reset();
+    /* Turns on the on-board reference. */
+    AD5668_SetInputRegister(AD5668_CMD(AD5668_CMD_SET_INT_REF)| AD5668_INT_REF_ON);
+    /* Clear code is set to 0x0000. */
+    AD5668_SetInputRegister(AD5668_CMD(AD5668_CMD_LOAD_CLEAR_CODE)| AD5668_CODE_0X0000);
+}
+
+/***************************************************************************//**
+ * @brief Sets the device in a specific power mode.
+ *
+ * @param pwrMode - power mode of the device.
+ *                  Example: AD5668_PWRDN_NONE
+ *                           AD5668_PWRDN_1K
+ *                           AD5668_PWRDN_100K
+ *                           AD5668_PWRDN_3STATE
+ *
+ * @param channel - The channel or channels that are being configured.
+ *                  Example:  AD5668_ADDR_DAC_A
+ *                            AD5668_ADDR_DAC_B
+ *                            ...
+ *                            AD5668_ADDR_DAC_ALL
+ *
+ * @return none.
+*******************************************************************************/
+void AD5668::AD5668_PowerMode(unsigned char pwrMode, unsigned char channel)
+{
+    unsigned char selectedChannel = 0;
+
+    if(channel == AD5668_ADDR_DAC_ALL)
+    {
+        selectedChannel = 0xFF;
+    }
+    else
+    {
+        selectedChannel = (1 << channel);
+    }
+    /* Selects a power mode for the selected channel. */
+    AD5668_SetInputRegister(AD5668_CMD(AD5668_CMD_POWERDOWN) |
+                            AD5668_POWER_MODE(pwrMode) |
+                            selectedChannel);
+}
+
+/***************************************************************************//**
+ * @brief Resets the device.
+ *
+ * @return none.
+*******************************************************************************/
+void AD5668::AD5668_Reset(void)
+{
+     AD5668_SetInputRegister(AD5668_CMD(AD5668_CMD_RESET));
+}
+
+void AD5668::AD5668_WRITE_INPUT_N(uint8_t channel, uint16_t data)
+{
+    AD5668_SetInputRegister(AD5668_CMD(AD5668_CMD_WRITE_INPUT_N) | AD5668_ADDR(channel) | AD5668_DATA_BITS(data));
+}
+
+void AD5668::AD5668_UPDATE_DAC_N(uint8_t channel, uint16_t data)
+{
+    AD5668_SetInputRegister(AD5668_CMD(AD5668_CMD_UPDATE_DAC_N) | AD5668_ADDR(channel) | AD5668_DATA_BITS(data));
+}
+
+void AD5668::AD5668_WRITE_INPUT_N_UPDATE_ALL(uint8_t channel, uint16_t data)
+{
+    AD5668_SetInputRegister(AD5668_CMD(AD5668_CMD_WRITE_INPUT_N_UPDATE_ALL) | AD5668_ADDR(channel) | AD5668_DATA_BITS(data));
+}
+
+void AD5668::AD5668_WRITE_INPUT_N_UPDATE_N(uint8_t channel, uint16_t data)
+{
+    AD5668_SetInputRegister(AD5668_CMD(AD5668_CMD_WRITE_INPUT_N_UPDATE_N) | AD5668_ADDR(channel) | AD5668_DATA_BITS(data));
+}
+    
+/***************************************************************************//**
+ * @brief Writes a 32-bit data-word to the Input Register of the device.
+ *
+ * @param registerValue - Value of the register.
+ *
+ * @return none.
+*******************************************************************************/
+void AD5668::AD5668_SetInputRegister(unsigned int registerValue)
+{
+    unsigned char registerWord[4] = {0, 0, 0, 0};
+    registerWord[0] = (unsigned char)((registerValue & 0xFF000000) >> 24);
+    registerWord[1] = (unsigned char)((registerValue & 0x00FF0000) >> 16);
+    registerWord[2] = (unsigned char)((registerValue & 0x0000FF00) >> 8);
+    registerWord[3] = (unsigned char)((registerValue & 0x000000FF) >> 0);
+    SPI_Write(registerWord);
+}
+
+void AD5668::SPI_Write(unsigned char *reg)
+{
+    nCS_=0;
+    for (int i = 0; i < 4; i++) {
+        spi_.write(reg[i]);
+    }
+    nCS_=1;
+}
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