Diff: main.cpp

Revision:

0:3718fa40956d

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Apr 18 04:59:01 2014 +0000
@@ -0,0 +1,107 @@
+#include "mbed.h"
+
+#define MMA8451_I2C_ADDRESS (0x1d<<1)
+#define REG_WHO_AM_I        0x0D
+#define REG_CTRL_REG1       0x2A
+#define REG_CTRL_REG2       0x2B
+#define REG_CTRL_REG3       0x2C
+#define REG_SYSMOD          0x0B
+#define REG_OUT_X_MSB       0x01
+  
+
+DigitalOut myled(LED_GREEN);
+Serial pc(USBTX, USBRX);
+I2C i2c(PTE25, PTE24); //MMA8451 Accelerometer
+
+
+int main() {
+    pc.baud(9600);
+    
+    uint8_t reg1_orig;
+    char t1[1] = {REG_CTRL_REG1};
+    i2c.write(MMA8451_I2C_ADDRESS, t1, 1, true);
+    i2c.read(MMA8451_I2C_ADDRESS, (char*) &reg1_orig, 1);
+    
+    uint8_t reg2_orig;
+    char t3[1] = {REG_CTRL_REG2};
+    i2c.write(MMA8451_I2C_ADDRESS, t3, 1, true);
+    i2c.read(MMA8451_I2C_ADDRESS, (char*) &reg2_orig, 1);
+    
+    while (true) {
+        
+        //This uses the I2C library function long forms
+        
+        pc.printf("reg1_orig: %x\n", reg1_orig);
+        pc.printf("reg2_orig: %x\n", reg2_orig);
+
+        
+        uint8_t who_am_i;
+        char t[1] = {REG_WHO_AM_I};
+        i2c.write(MMA8451_I2C_ADDRESS, t, 1, true);
+        i2c.read(MMA8451_I2C_ADDRESS, (char*) &who_am_i, 1);
+        pc.printf("WAI: %x\n", who_am_i);  //Print both to screen
+        
+        uint8_t x_val;
+        char tx_val[1] = {REG_OUT_X_MSB};
+        i2c.write(MMA8451_I2C_ADDRESS, tx_val, 1, true);
+        i2c.read(MMA8451_I2C_ADDRESS, (char*) &x_val, 1);
+        pc.printf("x: %x\n", x_val);  //Print both to screen
+        
+        myled=0;
+        wait(0.1);
+        myled=1;
+        wait(0.1);
+        myled=0;
+        wait(0.1);
+        myled=1;
+        wait(0.1);
+        
+        uint8_t w1[2] = {REG_CTRL_REG1, 0x01};
+        i2c.write(MMA8451_I2C_ADDRESS, (char *) w1, 2);
+        uint8_t w2[2] = {REG_CTRL_REG2, 0x00};
+        i2c.write(MMA8451_I2C_ADDRESS, (char *) w2, 2);
+        wait(5); //delay for measurement
+        
+        myled=0;
+        wait(0.1);
+        myled=1;
+        wait(0.1);
+        
+        uint8_t w1_off[2] = {REG_CTRL_REG1, 0x00};
+        i2c.write(MMA8451_I2C_ADDRESS, (char *) w1_off, 2);
+        wait(5); //delay for measurement
+
+        
+        uint8_t reg1_value=6;
+        i2c.write(MMA8451_I2C_ADDRESS, t1, 1, true);
+        i2c.read(MMA8451_I2C_ADDRESS, (char*) &reg1_value, 1);
+        pc.printf("reg1_new: %x\n", reg1_value);  //Print both to screen
+
+        uint8_t reg2_value=6;
+        i2c.write(MMA8451_I2C_ADDRESS, t3, 1, true);
+        i2c.read(MMA8451_I2C_ADDRESS, (char*) &reg2_value, 1);
+        pc.printf("reg2_new: %x\n", reg2_value);  //Print both to screen
+
+
+        //End of Long form
+        //wait(5);
+        
+        uint8_t sys_mod;
+        char t2[1] = {REG_SYSMOD};
+        i2c.write(MMA8451_I2C_ADDRESS, t2, 1, true);
+        i2c.read(MMA8451_I2C_ADDRESS, (char*) &sys_mod, 1);
+        pc.printf("Sysmod: %x\n", sys_mod);  //Print both to screen
+
+        //pc.printf("WAI: %x, Reg1: %x\n", who_am_i, reg1_value);  //Print both to screen
+        //pc.printf("Short: %x Long: %x\n", who_am_i, who_am_i_2);  //Print both to screen
+
+        //myled = !myled; //Heartbeat
+    }
+}
+
+/*    
+void MMA8451Q::readRegs(int addr, uint8_t * data, int len) {
+    char t[1] = {addr};
+    m_i2c.write(m_addr, t, 1, true);
+    m_i2c.read(m_addr, (char *)data, len);
+}*/
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