Revision 0:d9853774f233, committed 2016-03-03

Comitter:

rmcwilliam101

Date:

Thu Mar 03 13:49:03 2016 +0000

Commit message:

AXDL library

Changed in this revision

diff -r 000000000000 -r d9853774f233 ADXL362.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ADXL362.cpp	Thu Mar 03 13:49:03 2016 +0000
@@ -0,0 +1,91 @@
+#include "mbed.h"
+#include "ADXL362.h"
+ 
+// Class
+ 
+ADXL362::ADXL362(PinName mosi, PinName miso, PinName sclk, PinName cbs)
+	: SPI_m(mosi, miso, sclk) 
+	, CBS_m(cbs) {
+	CBS_m=1;
+	}
+	
+// SPI 
+
+void ADXL362::init_spi(){
+	// spi 8 bits, mode 0, 1 MHz for adxl362
+    SPI_m.format(8,0);
+    // 5 MHz, max for acc - works fine
+    SPI_m.frequency(5000000);
+}
+
+
+
+void ADXL362::init_adxl362(){
+	//uint8_t reg;
+	// reset the adxl362
+    wait_ms(200);
+    ACC_WriteReg(RESET, 0x52);
+    wait_ms(200);
+
+    // set FIFO
+    ACC_WriteReg(FIFO_CTL,0x0A);  // stream mode, AH bit
+    //ACC_WriteReg(FIFO_CTL,0x02);  // stream mode, no AH bit
+    //reg = ACC_ReadReg(FIFO_CTL);
+    //pc.printf("FIFO_CTL = 0x%X\r\n", reg);
+
+	// Not used but keep in case it is important to set FIFO parameters.
+    //ACC_WriteReg(FIFO_SAM,SAMPLE_SET * 3);   // fifo depth
+    //reg = ACC_ReadReg(FIFO_SAM);
+    //pc.printf("FIFO_SAM = 0x%X\r\n", reg);
+
+    // set adxl362 to 4g range, 25Hz
+    //ACC_WriteReg(FILTER_CTL,0x51);
+    // 2g, 25Hz
+    ACC_WriteReg(FILTER_CTL,0x11);
+    //reg = ACC_ReadReg(FILTER_CTL);
+    //printf("FILTER_CTL = 0x%X\r\n", reg);
+
+    // map adxl362 interrupts
+    //ACC_WriteReg(INTMAP1,0x01); //data ready
+    ACC_WriteReg(INTMAP1,0x04); //watermark
+    //reg = ACC_ReadReg(INTMAP1);
+    //pc.printf("INTMAP1 = 0x%X\r\n", reg);
+
+    // set adxl362 to measurement mode, ultralow noise
+    ACC_WriteReg(POWER_CTL,0x22);
+    //reg = ACC_ReadReg(POWER_CTL);
+    //pc.printf("POWER_CTL = 0x%X\r\n", reg);
+}
+
+void ADXL362::ACC_GetXYZ8(int8_t* x, int8_t* y, int8_t* z)
+{
+    CBS_m = DOWN;
+    SPI_m.write(RD_SPI);
+    SPI_m.write(0x08);
+
+    *x = SPI_m.write(0x00);
+    *y = SPI_m.write(0x00);
+    *z = SPI_m.write(0x00);
+
+    CBS_m = UP;
+}
+
+
+uint8_t ADXL362::ACC_ReadReg( uint8_t reg )
+{
+    CBS_m = DOWN;
+    SPI_m.write(RD_SPI);
+    SPI_m.write(reg);
+    uint8_t val = SPI_m.write(0x00);
+    CBS_m = UP;
+    return (val);
+}
+
+void ADXL362::ACC_WriteReg( uint8_t reg, uint8_t cmd )
+{
+    CBS_m = DOWN;
+    SPI_m.write(WR_SPI);
+    SPI_m.write(reg);
+    SPI_m.write(cmd);
+    CBS_m = UP;
+}

diff -r 000000000000 -r d9853774f233 ADXL362.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ADXL362.h	Thu Mar 03 13:49:03 2016 +0000
@@ -0,0 +1,85 @@
+#ifndef _ADXL362_H_
+#define _ADXL362_H_
+
+#include "mbed.h"
+
+// ACC Registers
+#define ID0 0x00
+#define STATUS 0x0b
+#define FIFO_EL 0x0c
+#define FIFO_EH 0x0d
+#define RESET 0x1f
+#define FIFO_CTL 0x28
+#define FIFO_SAM 0x29
+#define INTMAP1 0x2a
+#define INTMAP2 0x2b
+#define FILTER_CTL 0x2c
+#define POWER_CTL 0x2d
+#define WR_SPI 0x0a
+#define RD_SPI 0x0b
+#define RD_FIFO 0x0d
+#define DOWN 0
+#define UP 1
+#define SAMPLE_SET 128
+
+/*		Class ADXL362: configure and connect to ADXL362 3-axis accelerometer.
+ *		Richard McWilliam
+ *
+ *		Example:
+ *
+ *		#include "mbed.h"
+ *		#include "ADXL362.h"
+ *
+ *		ADXL362 adxl362(p11, p12, p13, p10);  // Accelerometer (mosi, miso, sclk, cs)
+ *
+ *		int main()
+ *		{
+ *		// local variables
+ *		int8_t x8 = 0;
+ *		int8_t y8 = 0;
+ *		int8_t z8 = 0;	
+ *		uint8_t reg;
+ *
+ *		// set up SPI interface
+ *		adxl362.init_spi();
+ *		// Set up accelerometer
+ *		adxl362.init_adxl362();
+ *
+ *		// Check settings
+ *		reg = adxl362.ACC_ReadReg(FILTER_CTL);
+ * 		printf("FILTER_CTL = 0x%X\r\n", reg);
+ *
+ *		adxl362.ACC_GetXYZ8(&x8, &y8, &z8); // Fetch sample from ADXL362
+ *		wait(0.1); // Wait is required in this mode
+ *			
+ *		}
+*/
+class ADXL362 {
+	
+	public:
+		// Set up object for communcation with ADXL362. Pins are mosi, miso, sclk, cs
+		ADXL362(PinName mosi, PinName miso, PinName sclk, PinName cbs);
+		//~ADXL362() {};
+		
+		// Initialise the SPI interface for ADXL362
+		void init_spi();
+		
+		// Initialise ADXL362 in basic capture mode, 8 bit pcakets.
+		void init_adxl362();
+		
+		// Fetch a single set of x,y,z packets indicating acceleration
+		void ACC_GetXYZ8(int8_t* x, int8_t* y, int8_t* z);
+		
+		// Read specified register of ADXL362
+		uint8_t ACC_ReadReg( uint8_t reg );
+		
+		// Write to register of ADXL362
+		void ACC_WriteReg( uint8_t reg, uint8_t cmd );
+	
+	private:
+		SPI SPI_m;
+        DigitalOut CBS_m;		
+
+};
+
+#endif
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