Diff: mma8452.cpp

Revision:

0:65b19bf1382a

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mma8452.cpp	Sun Jul 02 16:04:27 2017 +0000
@@ -0,0 +1,67 @@
+/*
+ * Library for mma8452 3-Axis, 12-bit/8-bit, Digital Accelerometer
+ * Made by Jurica Resetar
+ * jurica_resetar@yahoo.com
+ *
+ * All rights reserved
+ */
+ 
+ 
+#include "mma8452.h"
+
+Acc_MMA8452::Acc_MMA8452(PinName sda, PinName scl, char address): i2c(sda, scl), acc_address(address){
+}
+
+Acc_MMA8452::~Acc_MMA8452(){
+}
+
+uint8_t Acc_MMA8452::set_register(char reg, char data){
+    char cmd[2] = {0, 0};
+    i2c.start();
+    cmd[0] = MODE_STATUS;
+    cmd[1] = 0x00;                      // Standby Mode on
+    i2c.write(acc_address, cmd, 2);
+  
+    cmd[0] = reg;
+    cmd[1] = data;                      // New value of the register
+    i2c.write(acc_address, cmd, 2); 
+      
+    cmd[0] = MODE_STATUS;
+    cmd[1] = 0x01;                      // Active Mode on
+    i2c.write(acc_address, cmd, 2);
+    i2c.stop();
+    return 0;       // Success
+}
+
+uint8_t Acc_MMA8452::get_register(char reg, char *data){
+    char temp_read = 2;
+    i2c.start();
+    if(i2c.write(acc_address & 0xFE) == 0){            // just good practice to force bit 1 to a '0' by ANDing with 0xFE
+        return 1;                                       // we failed to write the mcu address on the bus to initiate dialogue 
+    }
+    if(i2c.write(reg) == 0){
+        return 1;                                       // we failed to write 'who am i' to the chip
+    }
+    i2c.start();
+    if(i2c.write(acc_address | 0x01) == 0){           // this is asking to read the slave mcu address - even though it's a 'write' method!!! Crap API...
+        return 1;                                       // we failed to request a read from that mcu - this really is just writing the mcu vaule on the bus
+    }
+    temp_read = i2c.read(0);
+    i2c.stop();
+    *data = temp_read;
+        
+    return 0;       // Success
+}
+
+uint8_t Acc_MMA8452::get_x_acc(char *data){
+    get_register(OUT_X_MSB, data);
+    return 0;
+}
+uint8_t Acc_MMA8452::get_y_acc(char *data){
+    get_register(OUT_Y_MSB, data);
+    return 0;
+}
+uint8_t Acc_MMA8452::get_z_acc(char *data){
+    get_register(OUT_Z_MSB, data);
+    return 0;
+}
\ No newline at end of file