Diff: libraries/AD7798/AD7798.h

Revision:

33:c3ec596a29c2

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libraries/AD7798/AD7798.h	Mon Nov 07 16:27:12 2016 +0200
@@ -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_