Add MMC5603 Magnetic Sensor

Author: shaoziyang

sensor/MMC5603/MMC5603.py

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+from machine import I2C
+from micropython import const
+
+MMC5603ADDR = const(48)
+
+class MMC5603:
+    
+    def __init__(self, i2c):
+        self.i2c = i2c
+        self.tb = bytearray(1)
+        self.rb = bytearray(1)
+        self._rawx = 0
+        self._rawy = 0
+        self._rawz = 0
+        if self.reg_get(0x39) != 0x10:
+           raise Exception('MMC5603 ID error!')
+        self.on()
+    
+    def on(self):
+        # ODR = 10
+        self.reg_set(0x1A, 10)
+        self.reg_set(0x1C, 0x03)
+        # set CONTINUOUS mode
+        self.reg_set(0x1B, 0xA0)
+        self.reg_set(0x1D, 0x1B)
+
+    def off(self):
+        # soft reset
+        self.reg_set(0x1C, 0x80)        
+
+    def reg_set(self, reg, val):
+        self.tb[0] = val
+        self.i2c.writeto_mem(MMC5603ADDR, reg, self.tb)
+        
+    def reg_get(self, reg):
+        self.i2c.readfrom_mem_into(MMC5603ADDR, reg, self.rb)
+        return self.rb[0]        
+    
+    def rawx(self):
+        self._rawx = self.reg_get(0)*256+self.reg_get(1)-32768
+        return self._rawx
+
+    def rawy(self):
+        self._rawy = self.reg_get(2)*256+self.reg_get(3)-32768
+        return self._rawy
+
+    def rawz(self):
+        self._rawz = self.reg_get(4)*256+self.reg_get(5)-32768
+        return self._rawz
+    
+    def x(self):
+        return self.rawx() // 10
+
+    def y(self):
+        return self.rawy() // 10
+
+    def z(self):
+        return self.rawz() // 10
+    
+    def T(self):
+        self.reg_set(0x1B, 0xA3)
+        return self.reg_get(9)*0.8-75
+

sensor/MMC5603/READMD.md

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+# [mpy-lib](https://github.com/micropython-Chinese-Community/mpy-lib)
+
+## MMC5603 3-axis Magnetic Sensor
+
+- [DataSheet](
+https://www.memsic.com/Public/Uploads/uploadfile/files/20220119/MMC5603NJDatasheetRev.B.pdf)
+
+The MMC5603NJ is a monolithic complete 3-axis AMR magnetic sensor with  on-chip signal processing and integrated digital bus (I 2 C fast mode and I3C interface), the device can be connected directly to a microprocessor,  eliminating the need for A/D converters or timing resources. 
+
+## Example
+
+
+```py
+from machine import I2C, Pin
+from time import sleep_ms
+
+from MMC5603 import MMC5603
+
+i2c = I2C(0, sda=Pin(4), scl=Pin(16))
+
+m = MMC5603(i2c)
+
+while 1:
+    sleep_ms(500)
+    print(m.x(), m.y(), m.z())
+
+```