add cs5460a.py

Author: Lyubiao

07.sensors/cs5460a/cs5460a.py

@@ -0,0 +1,87 @@
+from machine import Pin, SPI
+import utime
+
+class cs5460a(object):
+    def __init__(self, spi, cs=4, rst=2):
+        self.spi = spi
+        self.cs = Pin(cs, Pin.OUT)
+        self.rst = Pin(rst, Pin.OUT)
+        self.FLOAT24 = 16777216.0  # 2^24
+        self.VOLTAGE_MULTIPLIER = (1 / self.FLOAT24 * 385)
+        self.CURRENT_MULTIPLIER = (1 / self.FLOAT24 * 11.66)
+        self.POWER_MULTIPLIER = (1 / self.FLOAT24 * 1.024 * 385 * 11.66 * 2)
+
+    def read(self, addr):
+        b = bytearray([0xfe, 0xfe, 0xfe])
+        buf = bytearray(3)
+        self.cs.value(0)
+        self.spi.write(bytearray([addr]))
+        self.spi.write_readinto(b, buf)
+        self.cs.value(1)
+        # print(buf[0],buf[1],buf[2])
+        return buf
+
+    def write(self, addr, data):
+        self.cs.value(0)
+        self.spi.write(bytearray([addr]))
+        self.spi.write(data)
+        self.cs.value(1)
+        # print('write_ok')
+
+    def cs5460a_init(self):
+        self.rst.value(0)
+        utime.sleep_ms(50)
+        self.rst.value(1)  # reset the  cs5460a
+
+        self.cs.value(0)
+        self.spi.write(bytearray([0xa0]))
+        self.cs.value(1)  # the command of the power_up
+
+        self.write(0x40, bytearray([0x00, 0x00, 0x61]))  # set
+        self.write(0x48, bytearray([0x46, 0xfa, 0xcb]))
+        self.write(0x44, bytearray([0x42, 0x66, 0xb4]))
+
+        self.cs.value(0)
+        self.spi.write(bytearray([0xe8]))
+        self.cs.value(1)  # start to convert
+
+    def conv(self, true_power):
+        if true_power[0] > 0x80:
+            a = bytearray([~true_power[0]])
+            a[0] &= 0x7f
+            # print(a)
+            b = bytearray([~true_power[1]])
+            # print(b)
+            c = bytearray([~true_power[2]])
+            # print(c)
+            temp = ((c[0] + b[0] * 256 + a[0] * 65536) + 1)
+        else:
+            temp = ((true_power[0] + true_power[0] * 256 + true_power[0] * 65536) + 1)
+        return temp
+
+
+def unit_test():
+    vspi = SPI(-1, sck=Pin(18), mosi=Pin(23), miso=Pin(19), baudrate=2000000)  # -1 software spi
+    ts = cs5460a(vspi)
+    ts.cs5460a_init()  # 初始化
+
+    while True:
+        utime.sleep_ms(1000)
+        k = ts.read(0x1e)
+        print(k)
+        voltage = ts.read(0x18)
+        current = ts.read(0x16)
+        true_power = ts.read(0x14)
+        temp1 = (current[2] + current[1] * 256 + current[0] * 65536)
+        temp2 = (voltage[2] + voltage[1] * 256 + voltage[0] * 65536)
+        t = ts.conv(true_power)
+        A = ts.CURRENT_MULTIPLIER * temp1
+        V = ts.VOLTAGE_MULTIPLIER * temp2
+        P = ts.POWER_MULTIPLIER * t
+        print('current=%.2f A' % A)
+        print('voltage=%.2f V' % V)
+        print('ture_power=%.2f W' % P)
+
+
+if __name__ == '__main__':
+    unit_test()