mma8451q driver

Dependents:   nRF51822_DataLogger_PowerImpulseCounter scpi_sx127x NAMote72_Utility

Revision:
1:778b685c3ad0
Parent:
0:cb0046a629c1
Child:
2:4bc96749141e
--- a/mma8451q.cpp	Wed Mar 18 00:58:44 2015 +0000
+++ b/mma8451q.cpp	Fri May 08 01:31:18 2015 +0000
@@ -11,12 +11,11 @@
 #define MMA8451_I2C_ADDRESS                          0x38 //0x1C
 
 
-MMA8451Q::MMA8451Q(I2C& r) : m_i2c(r)
+MMA8451Q::MMA8451Q(I2C& r, DigitalIn& int_pin) : m_i2c(r), m_int_pin(int_pin)
 {
-/*    char cmd[2];
-    
-    cmd[0] = MMA8451_ID;
-    m_i2c.read(MMA8451_I2C_ADDRESS, cmd, 1);*/
+    /* INT pins on this chip default to push-pull output */
+    write(MMA8451_CTRL_REG3, 0x01);    // set PP_OD
+    /* INT1 and INT2 are tied together */
     
 }
 
@@ -30,9 +29,9 @@
 
     cmd[0] = addr;
     if (m_i2c.write(MMA8451_I2C_ADDRESS, cmd, 1, true))
-        printf("MMA8451Q write-fail\n");
+        printf("MMA write-fail %02x\n", addr);
     if (m_i2c.read(MMA8451_I2C_ADDRESS, (char *)dst_buf, length))
-        printf("MMA8451Q read-fail\n");
+        printf("MMA read-fail\n");
 }
 
 uint8_t MMA8451Q::read_single(uint8_t addr)
@@ -41,21 +40,26 @@
 
     cmd[0] = addr;
     if (m_i2c.write(MMA8451_I2C_ADDRESS, cmd, 1, true))
-        printf("MMA8451Q write-fail\n");
+        printf("MMA write-fail %02x\n", addr);
     if (m_i2c.read(MMA8451_I2C_ADDRESS, cmd, 1))
-        printf("MMA8451Q read-fail\n");
+        printf("MMA read-fail\n");
 
     return cmd[0];
 }
 
 void MMA8451Q::print_regs()
 {
-    printf("ID: %x\n", read_single(MMA8451_ID));
-    printf("sysmod:%x\n", read_single(MMA8451_SYSMOD));
+    printf("ID: %02x\n", read_single(MMA8451_ID));
+    printf("sysmod:%02x\n", read_single(MMA8451_SYSMOD));
     ctrl_reg1.octet = read_single(MMA8451_CTRL_REG1);
-    printf("ctrl_reg1:%x\n", ctrl_reg1.octet);
-    printf("ctrl_reg2:%x\n", read_single(MMA8451_CTRL_REG2));
-    printf("status: %x\n", read_single(MMA8451_STATUS)); 
+    printf("ctrl_reg1:%02x\n", ctrl_reg1.octet);
+    printf("ctrl_reg2:%02x\n", read_single(MMA8451_CTRL_REG2));
+    printf("ctrl_reg3:%02x\n", read_single(MMA8451_CTRL_REG3)); /* TODO: PP_OD is bit 0 (1=open drain) */
+    printf("(int en) ctrl_reg4:%02x\n", read_single(MMA8451_CTRL_REG4));
+    printf("(int cfg) ctrl_reg5:%02x\n", read_single(MMA8451_CTRL_REG5));
+    printf("status:%02x\n", read_single(MMA8451_STATUS)); 
+    /* (interrupt status) int src at 0x0c (MMA8451_INT_SOURCE): data ready, motion/freefall, pulse, orientation, transient, auto sleep */
+    printf("INT_SOURCE:%02x\n", read_single(MMA8451_INT_SOURCE)); 
 }
 
 void MMA8451Q::write(uint8_t addr, uint8_t data)
@@ -66,7 +70,7 @@
     cmd[1] = data;
 
     if (m_i2c.write(MMA8451_I2C_ADDRESS, (char *)cmd, 2))
-        printf("MMA8451Q write-fail\n");
+        printf("MMA write-fail %02x\n", addr);
 }
 
 void MMA8451Q::set_active(char arg)
@@ -77,14 +81,17 @@
     cmd[1] = arg;
 
     if (m_i2c.write(MMA8451_I2C_ADDRESS, cmd, 2))
-        printf("write-fail\n");
+        printf("MMA write-fail %02x\n", cmd[0]);
 }
 
-uint8_t MMA8451Q::get_active(void)
+bool MMA8451Q::get_active(void)
 {
     uint8_t ret = read_single(MMA8451_CTRL_REG1);
-    printf("CTRL_REG1: %x\n", ret);
-    return ret;
+    //printf("CTRL_REG1: %x\n", ret);
+    if (ret & 1)
+        return true;
+    else
+        return false;
 }
 
 
@@ -137,3 +144,41 @@
      * System Interrupt Status and the Transient Status */
 }
 
+void MMA8451Q::service()
+{
+    mma_int_source_t int_src;
+    if (m_int_pin)
+        return; // no interrupt
+        
+    int_src.octet = read_single(MMA8451_INT_SOURCE);
+    
+    if (int_src.bits.SRC_DRDY) {
+        read(MMA8451_OUT_X_MSB, out.octets, 6);
+    }
+    if (int_src.bits.SRC_FF_MT) {
+        read_single(MMA8451_FF_MT_SRC);
+    }
+    if (int_src.bits.SRC_PULSE) {
+        read_single(MMA8451_PULSE_SRC);
+    }
+    if (int_src.bits.SRC_LNDPRT) {
+        read_single(MMA8451_PL_STATUS);
+    }                        
+    if (int_src.bits.SRC_TRANS) {
+        transient_src_t t_src;
+        t_src.octet = read_single(MMA8451_TRANSIENT_SRC);
+        printf("transient src:%x ", t_src.octet);
+        if (t_src.bits.XTRANSE)
+            printf("X_Pol:%d ", t_src.bits.X_Trans_Pol);
+        if (t_src.bits.YTRANSE)
+            printf("Y_Pol:%d ", t_src.bits.Y_Trans_Pol);
+        if (t_src.bits.ZTRANSE)
+            printf("Z_Pol:%d ", t_src.bits.Z_Trans_Pol);
+        printf("\n");        
+    }
+    
+    if (int_src.bits.SRC_ASLP) {
+        read_single(MMA8451_SYSMOD);
+    }
+    
+}