Diff: MMA7455L_SPI.h

Revision:

0:0d4a1401a9c5

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MMA7455L_SPI.h	Sun Feb 05 21:03:49 2012 +0000
@@ -0,0 +1,80 @@
+/*This class is meant to interface the MMA7455L digital acceleromter with the mbed micro through a SPI interface.
+This class deals mainly with acquiring measurment from the acceleromter, but doesn't deal with pulse detection 
+or interrupts, so it needs to be extended*/
+
+#ifndef MMA7455L_SPI_H
+#define MMA7455L_SPI_H
+
+#include "mbed.h"
+
+/*declaration of the registers of the MMA7455L accelermoter*/
+
+#define X_OUT                                   0x06
+#define Y_OUT                                   0x07
+#define Z_OUT                                   0x08
+#define STATUS                                  0x09
+#define DETECTION_SOURCE_REGISTER               0x0A
+#define X_OFF_LSB                               0x10
+#define X_OFF_MSB                               0x11
+#define Y_OFF_LSB                               0x12
+#define Y_OFF_MSB                               0x13
+#define Z_OFF_LSB                               0x14
+#define Z_OFF_MSB                               0x15
+#define MODE_CONTROL                            0x16
+#define INTERRUPT_LATCH_RESET                   0x17
+#define CONTROL_1                               0x18
+#define CONTROL_2                               0x19
+#define LEVEL_DETECTION_THRESHOLD_LIMIT         0x1A
+#define PULSE_DETECTION_THRESHOLD_LIMIT         0x1B
+#define PULSE_DURATION_VALUE                    0x1C
+#define LATENCY_TIME_VALUE                      0x1D
+
+/*some useful charechters for writing, reading and checking readiness of data*/
+#define READ                                    0x00
+#define WRITE                                   0x80
+#define DATA_READY                              0x01
+
+               
+
+
+ class MMA7455L_SPI{
+ 
+ public: 
+ 
+ float Ax,Ay,Az;
+ MMA7455L_SPI(PinName, PinName, PinName, PinName); /*mosi, miso, clk and cs*/
+ void update_acceleration();
+ void set_range_of_measurment(int GS1, int GS0); /*this function takes two bits, zeros ones
+                                                   and they are used to determine the required char 
+                                                   to be sent to the mode control register*/
+//void set_mode_of_operation(int LSB1, int LSB2);                                                 
+ 
+ 
+ private:
+ 
+ int sensetivity;
+ DigitalOut _CS;
+ SPI _spi;
+ 
+ /*we declare some basic functions for reading data from accelermoter and writing to the accelermoter**/
+ signed char read(char adress);
+ void write(char adress, char content);
+ 
+ /*some basic functions that take a char that controls mode of operation and behaviour of the accelermoter*/
+ void set_mode(char);
+ void set_interrupt_latch_reset_time(char value = 0x03);
+ void set_offsets(char, char, char); 
+ void set_control_1(char value = 0x00);
+ void set_control_2(char value = 0x00);
+ void set_level_detection_thershold_limit_value(char value = 0x2F);
+ void set_pulse_detection_thershold_limit_value(char value = 0x2F);
+ void set_pulse_duration_value(char value = 0x2F);
+ void set_latency_time_value(char value =0x2F);
+ 
+ /*some auxillary functions that describes its status*/
+ signed char status();
+ 
+ 
+ 
+ };
+ #endif
\ No newline at end of file