Analog Devices
AD7798 ADC driver
Diff: AD7798.h
- Revision:
- 0:fb6fe6fa2835
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/AD7798.h Mon Nov 07 15:45:27 2016 +0000
@@ -0,0 +1,148 @@
+#ifndef _AD7798_H_
+#define _AD7798_H_
+
+#include <mbed.h>
+
+/******************************************************************************/
+/* AD7798 */
+/******************************************************************************/
+
+/*AD7798 Registers*/
+#define AD7798_REG_COMM 0 /* Communications Register(WO, 8-bit) */
+#define AD7798_REG_STAT 0 /* Status Register (RO, 8-bit) */
+#define AD7798_REG_MODE 1 /* Mode Register (RW, 16-bit */
+#define AD7798_REG_CONF 2 /* Configuration Register (RW, 16-bit)*/
+#define AD7798_REG_DATA 3 /* Data Register (RO, 16-/24-bit) */
+#define AD7798_REG_ID 4 /* ID Register (RO, 8-bit) */
+#define AD7798_REG_IO 5 /* IO Register (RO, 8-bit) */
+#define AD7798_REG_OFFSET 6 /* Offset Register (RW, 24-bit */
+#define AD7798_REG_FULLSCALE 7 /* Full-Scale Register (RW, 24-bit */
+
+/* Communications Register Bit Designations (AD7798_REG_COMM) */
+#define AD7798_COMM_WEN (1 << 7) /* Write Enable */
+#define AD7798_COMM_WRITE (0 << 6) /* Write Operation */
+#define AD7798_COMM_READ (1 << 6) /* Read Operation */
+#define AD7798_COMM_ADDR(x) (((x) & 0x7) << 3) /* Register Address */
+#define AD7798_COMM_CREAD (1 << 2) /* Continuous Read of Data Register */
+
+/* Status Register Bit Designations (AD7798_REG_STAT) */
+#define AD7798_STAT_RDY (1 << 7) /* Ready */
+#define AD7798_STAT_ERR (1 << 6) /* Error (Overrange, Underrange) */
+#define AD7798_STAT_CH3 (1 << 2) /* Channel 3 */
+#define AD7798_STAT_CH2 (1 << 1) /* Channel 2 */
+#define AD7798_STAT_CH1 (1 << 0) /* Channel 1 */
+
+
+#define AD7798_CH3 (1 << 2) /* Channel 3 */
+#define AD7798_CH2 (1 << 1) /* Channel 2 */
+#define AD7798_CH1 (1 << 0) /* Channel 1 */
+
+/* Mode Register Bit Designations (AD7798_REG_MODE) */
+#define AD7798_MODE_SEL(x) (((x) & 0x7) << 13) /* Operation Mode Select */
+#define AD7798_MODE_PSW(x) (1 << 12) /* Power Switch Control Bit */
+#define AD7798_MODE_RATE(x) ((x) & 0xF) /* Filter Update Rate Select */
+
+/* AD7798_MODE_SEL(x) options */
+#define AD7798_MODE_CONT 0 /* Continuous Conversion Mode */
+#define AD7798_MODE_SINGLE 1 /* Single Conversion Mode */
+#define AD7798_MODE_IDLE 2 /* Idle Mode */
+#define AD7798_MODE_PWRDN 3 /* Power-Down Mode */
+#define AD7798_MODE_CAL_INT_ZERO 4 /* Internal Zero-Scale Calibration */
+#define AD7798_MODE_CAL_INT_FULL 5 /* Internal Full-Scale Calibration */
+#define AD7798_MODE_CAL_SYS_ZERO 6 /* System Zero-Scale Calibration */
+#define AD7798_MODE_CAL_SYS_FULL 7 /* System Full-Scale Calibration */
+
+/* Configuration Register Bit Designations (AD7798_REG_CONF) */
+#define AD7798_CONF_BO_EN (1 << 13) /* Burnout Current Enable */
+#define AD7798_CONF_UNIPOLAR (1 << 12) /* Unipolar/Bipolar Enable */
+#define AD7798_CONF_GAIN(x) (((x) & 0x7) << 8) /* Gain Select */
+#define AD7798_CONF_REFDET(x) (((x) & 0x1) << 5) /* Reference detect function */
+#define AD7798_CONF_BUF (1 << 4) /* Buffered Mode Enable */
+#define AD7798_CONF_CHAN(x) ((x) & 0x7) /* Channel select */
+
+/* AD7798_CONF_GAIN(x) options */
+#define AD7798_GAIN_1 0
+#define AD7798_GAIN_2 1
+#define AD7798_GAIN_4 2
+#define AD7798_GAIN_8 3
+#define AD7798_GAIN_16 4
+#define AD7798_GAIN_32 5
+#define AD7798_GAIN_64 6
+#define AD7798_GAIN_128 7
+
+/* AD7798_CONF_REFDET(x) options */
+#define AD7798_REFDET_ENA 1
+#define AD7798_REFDET_DIS 0
+
+/* AD7798_CONF_CHAN(x) options */
+#define AD7798_CH_AIN1P_AIN1M 0 /* AIN1(+) - AIN1(-) */
+#define AD7798_CH_AIN2P_AIN2M 1 /* AIN2(+) - AIN2(-) */
+#define AD7798_CH_AIN3P_AIN3M 2 /* AIN3(+) - AIN3(-) */
+#define AD7798_CH_AIN1M_AIN1M 3 /* AIN1(-) - AIN1(-) */
+#define AD7798_CH_AVDD_MONITOR 7 /* AVDD Monitor */
+
+/* ID Register Bit Designations (AD7798_REG_ID) */
+#define AD7798_ID 0x8
+#define AD7798_ID_MASK 0xF
+
+/* IO (Excitation Current Sources) Register Bit Designations (AD7798_REG_IO) */
+#define AD7798_IOEN (1 << 6)
+#define AD7798_IO1(x) (((x) & 0x1) << 4)
+#define AD7798_IO2(x) (((x) & 0x1) << 5)
+
+#define TRUE 1
+#define FALSE 0
+
+#define AD7798_UNIPOLAR TRUE
+#define AD7798_BIPOLAR FALSE
+
+#define AD7798_ENABLE TRUE
+#define AD7798_DISABLE FALSE
+
+/******************************************************************************/
+/* Functions Prototypes */
+/*****************************************************************************/
+
+class AD7798
+{
+public:
+ AD7798( PinName CS, PinName MOSI = SPI_MOSI, PinName MISO = SPI_MISO, PinName SCK = SPI_SCK);
+ /* Initialize AD7798 and check if the device is present*/
+ uint8_t init(void);
+ void frequency(int hz);
+ /* Sends 32 consecutive 1's on SPI in order to reset the part. */
+ void reset(void);
+ /* Reads the value of the selected register. */
+ uint16_t get_register_value(uint8_t regAddress, uint8_t size, bool toggle_cs = true);
+ /* Writes a value to the register. */
+ void set_register_value(uint8_t regAddress, uint16_t regValue, uint8_t size, bool toggle_cs = true);
+ /* Sets the operating mode of AD7798. */
+ void set_mode(uint8_t mode);
+ /* Reads /RDY bit of Status register. */
+ uint8_t ready(void);
+ /* Selects the channel of AD7798. */
+ void set_channel(uint8_t channel);
+ /* Sets the gain of the In-Amp. */
+ void set_gain(uint16_t gain);
+ /* Enables or disables the reference detect function. */
+ void set_reference(uint8_t state);
+
+ void set_filter(uint8_t filter);
+ void set_coding_mode(uint8_t mode);
+ void set_burnout_current(uint8_t select);
+
+ void read_data(uint8_t adcChannel, uint16_t *adcData);
+
+ uint8_t spi_read(uint8_t *data, uint8_t bytes_number, bool toggle_cs = true);
+ uint8_t spi_write(uint8_t *data, uint8_t bytes_number, bool toggle_cs = true);
+
+
+
+ //DigitalIn miso;///< DigitalIn must be initialized before SPI to prevent pin MUX overwrite
+ SPI ad7798;
+ DigitalOut cs;
+
+private:
+ const uint8_t _SPI_MODE = 0x03;
+};
+#endif // _AD7798_H_