初始化提交

boards/default_src/micropython/origin/build/lib/adxl345.py

@@ -0,0 +1,56 @@
+#ADXL345
+import time
+import ustruct
+from micropython import const
+
+DATA_FORMAT = const(0x31)
+BW_RATE     = const(0x2c)
+POWER_CTL   = const(0x2d)
+INT_ENABLE  = const(0x2E)
+OFSX        = const(0x1e)
+OFSY        = const(0x1f)
+OFSZ        = const(0x20)
+
+class ADXL345:
+    def __init__(self, i2c, address=0X53):
+        self._device = i2c
+        self._address = address
+        for addr in self._device.scan():
+            if self._device.readfrom_mem(addr, 0, 1)[0] == 0xe5:
+                self._address = addr
+                break
+            else:
+                raise AttributeError("Cannot find a ADXL345")
+                
+        self._wreg(DATA_FORMAT,0x2B)    #16g量程
+        self._wreg(BW_RATE,0x0A)        #数据输出速度为100Hz
+        self._wreg(INT_ENABLE,0x00)     #不使用中断
+
+        self._wreg(OFSX,0x00)
+        self._wreg(OFSY,0x00)
+        self._wreg(OFSZ,0x00)
+        self._wreg(POWER_CTL,0x08)      #链接使能,测量模式
+        time.sleep(0.5)
+
+    def readXYZ(self):
+        x, = ustruct.unpack('<h', self._rreg(0x32,2))
+        y, = ustruct.unpack('<h', self._rreg(0x34,2))
+        z, = ustruct.unpack('<h', self._rreg(0x36,2))
+        return (x/256,y/256,z/256)
+
+    def readX(self):
+        return self.readXYZ()[0]
+
+    def readY(self):
+        return self.readXYZ()[1]
+
+    def readZ(self):
+        return self.readXYZ()[2]
+
+    def _wreg(self, reg, val):
+        '''Write memory address'''
+        self._device.writeto_mem(self._address,reg,val.to_bytes(1, 'little'))
+
+    def _rreg(self, reg,nbytes=1):
+        '''Read memory address'''
+        return  self._device.readfrom_mem(self._address, reg, nbytes)[0] if nbytes<=1 else self._device.readfrom_mem(self._address, reg, nbytes)[0:nbytes]