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--- mp_mma7660 [2021/09/30 23:09]
gongyusu 创建
+++ mp_mma7660 [2021/10/13 21:54] (当前版本)
gongyusu
@@ 行 1: / 行 1: @@
-### I2C Scan from Maker Pi
+## 传感器的使用及I2C总线
+### 1. I2C Scan from Maker Pi
+[[https://learn.sparkfun.com/tutorials/i2c/all|Sparkfun上关于I2C的介绍]]
 <code python>
 # This code scans any I2C devices connected to I2C0 at frequency 100kHz
@@ 行 19: / 行 23: @@
 </code>
+I2C scan with printing
+<code python>
+# This code scans any I2C devices connected to I2C0 & I2C1 at frequency 100kHz
+# and print the address(es) on serial.
+# ---
+# Connection: I2C0, SCL0 = GP1, SDA0 = GP0
+#             I2C1, SCL1 = GP3, SDA1 = GP2
+# ---
+# Hardware: Any RP2040 boards.
+# ---
+import machine
+i2c0 = machine.I2C(0, scl=machine.Pin(1), sda=machine.Pin(0), freq=100000)
+i2c1 = machine.I2C(1, scl=machine.Pin(3), sda=machine.Pin(2), freq=100000)
+devices = i2c0.scan()
+if devices:
+    for d in devices:
+        print("i2c0:")
+        print(hex(d))
+devices = i2c1.scan()
+if devices:
+    for d in devices:
+        print("\ni2c1:")
+        print(hex(d))
+</code>
+### 2. MMA7660的驱动程序库
+<code python>
+# from machine import I2C
+class MMA7660_DATA:
+    def __init__(self):
+        self.X = None
+        self.Y = None
+        self.Z = None
+        self.TILT = None
+        self.SRST = None
+        self.SPCNT = None
+        self.INTSU = None
+        self.MODE = None
+        self.SR = None
+        self.PDET = None
+        self.PD = None
+# class MMA7660_ACC_DATA:
+#     def __init__(self,x,y,z):
+#         self.x = x
+#         self.y = y
+#         self.z = z
+class MMA7660_LOOKUP(object):
+    def __init__(self):
+        self.g = None
+        self.xyAngle = None
+        self.zAngle = None
+class Accelerometer(object):
+    MMA7660_ADDR = 0x4c
+    MMA7660TIMEOUT = 500
+    MMA7660_X = 0x00
+    MMA7660_Y = 0x01
+    MMA7660_Z = 0x02
+    MMA7660_TILT = 0x03
+    MMA7660_SRST = 0x04
+    MMA7660_SPCNT = 0x05
+    MMA7660_INTSU = 0x06
+    MMA7660_SHINTX = 0x80
+    MMA7660_SHINTY = 0x40
+    MMA7660_SHINTZ = 0x20
+    MMA7660_GINT = 0x10
+    MMA7660_ASINT = 0x08
+    MMA7660_PDINT = 0x04
+    MMA7660_PLINT = 0x02
+    MMA7660_FBINT = 0x01
+    MMA7660_MODE = 0x07
+    MMA7660_STAND_BY = 0x00
+    MMA7660_ACTIVE = 0x01
+    MMA7660_SR = 0x08      # sample rate register
+    AUTO_SLEEP_120 = 0X00     # 120 sample per second
+    AUTO_SLEEP_64 = 0X01
+    AUTO_SLEEP_32 = 0X02
+    AUTO_SLEEP_16 = 0X03
+    AUTO_SLEEP_8  = 0X04
+    AUTO_SLEEP_4  = 0X05
+    AUTO_SLEEP_2  = 0X06
+    AUTO_SLEEP_1  = 0X07
+    MMA7660_PDET = 0x09
+    MMA7660_PD = 0x0A
+    accLookup = []
+    for i in range(64):
+        s = MMA7660_LOOKUP()
+        accLookup.insert(i,s)
+    def __init__(self, i2c, address, interrupts=False):
+        self.i2c = i2c
+        self.address = address
+        i2c.init(I2C.MASTER, baudrate=20000)
+        initAccelTable()
+        setMode(MMA7660_STAND_BY)
+        setSampleRate(AUTO_SLEEP_32)
+        if interrupts:
+            write(MMA7660_INTSU, interrupts)
+        setMode(MMA7660_ACTIVE)
+    def write(self, register, data):
+        register = bytearray([register])
+        data = bytearray([data])
+        self.i2c.writeto_mem(self.address, register, data)
+    def read(self, register):
+        register = bytearray([register])
+        data = bytearray([data])
+        buf = ''
+        i2c.readfrom_mem_into(self.address,register,buf)
+        return buf
+    def initAccelTable(self):
+        val = 0
+        for i in range(32):
+            accLookup[i].g = val
+            val += 0.047
+        val = -0.047
+        for i in range(63,31,-1):
+            accLookup[i].g = val
+            val -= 0.047
+        val = 0
+        valZ = 90
+        for i in range(22):
+            accLookup[i].xyAngle = val
+            accLookup[i].zAngle = valZ
+            val -= 2.69
+            valZ += 2.69
+        val = -2.69
+        valZ = -87.31
+        for i in range(63, 42,-1):
+            accLookup[i].xyAngle = val
+            accLookup[i].zAngle = valZ
+            val -= 2.69
+            valZ += 2.69
+        for i in range(22,43):
+            accLookup[i].xyAngle = 255
+            accLookup[i].zAngle = 255
+    def setMode(self, mode):
+        write(MMA7660_MODE,mode)
+    def setSampleRate(self):
+        write(MMA7660_SR,rate)
+    def getXYZ(self, x, y, z):
+		count = 0
+		val = [64,64,64]
+        i2c.readfrom(self.address,1)
+        i2c.readfrom(self.address,3)
+        return data = (x,y,z)
+    def getAcceleration(self):
+        return True
+        return False
+    def getAllData(self):
+        count = 0
+        return True
+        return False
+</code>
+### 3. Maker.io上的文章
+[[https://www.digikey.com/en/maker/projects/raspberry-pi-pico-and-rp2040-micropython-part-2-i2c-sensor-and-module/b43e7958153f41fc9e7403df4d626ba5|I2C传感器和模块]]