Diff: libraries/ad7790/AD7790.cpp

Revision:

1:c1f0670bb370

Child:

3:1a8c14043a4e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libraries/ad7790/AD7790.cpp	Wed Mar 30 17:35:04 2016 +0300
@@ -0,0 +1,117 @@
+/**
+*   @file     AD7790.cpp
+*   @brief    Source file for AD7790 ADC
+*   @version  V0.1
+*   @author   ADI
+*   @date     March 2015
+**/
+
+#include <stdint.h>
+#include "mbed.h"
+#include "ad7790.h"
+
+
+/**
+ * @brief AD7790 constructor, sets CS pin and SPI format
+ * @param CS - (optional)chip select of the AD7790
+ * @param MOSI - (optional)pin of the SPI interface
+ * @param MISO - (optional)pin of the SPI interface
+ * @param SCK  - (optional)pin of the SPI interface
+ */
+AD7790::AD7790(PinName CS,
+               PinName MOSI,
+               PinName MISO,
+               PinName SCK) :
+    ad7790(MOSI, MISO, SCK),cs(CS)
+{
+    ad7790.format(8,3);
+    cs = true; // cs is active low
+}
+
+/**
+ * @brief Set AD7790 SPI frequency
+ * @param hz - SPI bus frequency in hz
+ * @return none
+ */
+void AD7790::frequency(int hz)
+{
+    ad7790.frequency(hz);
+}
+
+/**
+ * @brief Resets the AD7790
+ * @return none
+ */
+void AD7790::reset()
+{
+    cs = false;
+    ad7790.write(_RESET);
+    ad7790.write(_RESET);
+    ad7790.write(_RESET);
+    ad7790.write(_RESET);
+    cs = true;
+}
+
+/**
+ * @brief Reads the data register of the AD7790
+ * @return value of the register
+ */
+uint16_t AD7790::read_data(void)
+{
+    uint16_t dataResult = 0;
+
+    cs = false;
+    ad7790.write(_DATA_READ);
+    dataResult  = ((ad7790.write(_DUMMY_BYTE)) << 8);
+    dataResult |=  (ad7790.write(_DUMMY_BYTE));
+    cs = true;
+
+    return dataResult;
+}
+
+/**
+ * @brief Reads a register of the AD7790
+ * @param  regAddress - address of the register
+ * @return value of the register
+ */
+uint16_t AD7790::read_reg(AD7790Registers_t regAddress)
+{
+    uint16_t data = regAddress << 12;
+    data |= _DUMMY_BYTE;
+    data |= _READ_FLAG;
+    return	write_spi(data);
+}
+
+/**
+ * @brief Writes a register of the AD7790
+ * @param regAddress - address of the register
+ * @param regValue - value to be written
+ * @return none
+ *
+ */
+void AD7790::write_reg(AD7790Registers_t regAddress,uint8_t regValue)
+{
+    uint16_t data = regAddress << 12;
+    data |= regValue;
+    write_spi(data);
+}
+
+/**
+ * @brief Writes 16bit data to the AD7790 SPI interface
+ * @param data to be written
+ * @return data returned by the AD7790
+ */
+uint16_t AD7790::write_spi(uint16_t data)
+{
+    uint16_t result;
+    uint8_t upper_byte = (data >> 8) & 0xFF;
+    uint8_t lower_byte = data & 0xFF;
+    cs = false;
+    result  =  (ad7790.write(upper_byte) << 8);
+    result |=   ad7790.write(lower_byte);
+    cs = true;
+    return result;
+}
+
+
+