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import smbus
import time
SI1132_I2C_ADDR = 0x60
SI1132_PARTID = 0x32
cmds = {
'Si1132_PARAM_QUERY' : 0x80,
'Si1132_PARAM_SET' : 0xA0,
'Si1132_NOP' : 0x00,
'Si1132_RESET' : 0x01,
'Si1132_BUSADDR' : 0x02,
'Si1132_GET_CAL' : 0x12,
'Si1132_ALS_FORCE' : 0x06,
'Si1132_ALS_PAUSE' : 0x0A,
'Si1132_ALS_AUTO' : 0x0E,
}
params = {
'Si1132_PARAM_I2CADDR' : 0x00,
'Si1132_PARAM_CHLIST' : 0x01,
'Si1132_PARAM_CHLIST_ENUV' : 0x80,
'Si1132_PARAM_CHLIST_ENAUX' : 0x40,
'Si1132_PARAM_CHLIST_ENALSIR' : 0x20,
'Si1132_PARAM_CHLIST_ENALSVIS' : 0x10,
'Si1132_PARAM_ALSENCODING' : 0x06,
'Si1132_PARAM_ALSIRADCMUX' : 0x0E,
'Si1132_PARAM_AUXADCMUX' : 0x0F,
'Si1132_PARAM_ALSVISADCCOUNTER' : 0x10,
'Si1132_PARAM_ALSENCODING' : 0x06,
'Si1132_PARAM_ALSIRADCMUX' : 0x0E,
'Si1132_PARAM_AUXADCMUX' : 0x0F,
'Si1132_PARAM_ALSVISADCCOUNTER' : 0x10,
'Si1132_PARAM_ALSVISADCGAIN' : 0x11,
'Si1132_PARAM_ALSVISADCMISC' : 0x12,
'Si1132_PARAM_ALSVISADCMISC_VISRANGE' : 0x20,
'Si1132_PARAM_ALSIRADCCOUNTER' : 0x1D,
'Si1132_PARAM_ALSIRADCGAIN' : 0x1E,
'Si1132_PARAM_ALSIRADCMISC' : 0x1F,
'Si1132_PARAM_ALSIRADCMISC_RANGE' : 0x20,
'Si1132_PARAM_ADCCOUNTER_511CLK' : 0x70,
'Si1132_PARAM_ADCMUX_SMALLIR' : 0x00,
'Si1132_PARAM_ADCMUX_LARGEIR' : 0x03,
}
regs = {
'Si1132_REG_PARTID' : 0x00,
'Si1132_REG_REVID' : 0x01,
'Si1132_REG_SEQID' : 0x02,
'Si1132_REG_INTCFG' : 0x03,
'Si1132_REG_INTCFG_INTOE' : 0x01,
'Si1132_REG_IRQEN' : 0x04,
'Si1132_REG_IRQEN_ALSEVERYSAMPLE' : 0x01,
'Si1132_REG_IRQMODE1' : 0x05,
'Si1132_REG_IRQMODE2' : 0x06,
'Si1132_REG_HWKEY' : 0x07,
'Si1132_REG_MEASRATE0' : 0x08,
'Si1132_REG_MEASRATE1' : 0x09,
'Si1132_REG_UCOEF0' : 0x13,
'Si1132_REG_UCOEF1' : 0x14,
'Si1132_REG_UCOEF2' : 0x15,
'Si1132_REG_UCOEF3' : 0x16,
'Si1132_REG_PARAMWR' : 0x17,
'Si1132_REG_COMMAND' : 0x18,
'Si1132_REG_RESPONSE' : 0x20,
'Si1132_REG_IRQSTAT' : 0x21,
'Si1132_REG_ALSVISDATA0' : 0x22,
'Si1132_REG_ALSVISDATA1' : 0x23,
'Si1132_REG_ALSIRDATA0' : 0x24,
'Si1132_REG_ALSIRDATA1' : 0x25,
'Si1132_REG_UVINDEX0' : 0x2C,
'Si1132_REG_UVINDEX1' : 0x2D,
'Si1132_REG_PARAMRD' : 0x2E,
'Si1132_REG_CHIPSTAT' : 0x30,
}
class SI1132:
def __init__(self, i2c_dev):
self.bus = smbus.SMBus(int(i2c_dev.split('-')[-1]))
self.id = self.read_reg8(0x00)
if self.id != SI1132_PARTID:
print("Wrong Device ID [", hex(self.id), "]")
exit()
self.reset()
self.write_reg8(regs['Si1132_REG_UCOEF0'], 0x7B)
self.write_reg8(regs['Si1132_REG_UCOEF1'], 0x6B)
self.write_reg8(regs['Si1132_REG_UCOEF2'], 0x01)
self.write_reg8(regs['Si1132_REG_UCOEF3'], 0x00)
param = params['Si1132_PARAM_CHLIST_ENUV'] | params['Si1132_PARAM_CHLIST_ENALSIR'] | params['Si1132_PARAM_CHLIST_ENALSVIS']
self.writeParam(params['Si1132_PARAM_CHLIST'], param)
self.write_reg8(regs['Si1132_REG_INTCFG'], regs['Si1132_REG_INTCFG_INTOE'])
self.write_reg8(regs['Si1132_REG_IRQEN'], regs['Si1132_REG_IRQEN_ALSEVERYSAMPLE'])
self.writeParam(params['Si1132_PARAM_ALSIRADCMUX'], params['Si1132_PARAM_ADCMUX_SMALLIR'])
time.sleep(0.01)
self.writeParam(params['Si1132_PARAM_ALSIRADCGAIN'], 0)
time.sleep(0.01)
self.writeParam(params['Si1132_PARAM_ALSIRADCCOUNTER'], params['Si1132_PARAM_ADCCOUNTER_511CLK'])
self.writeParam(params['Si1132_PARAM_ALSIRADCMISC'], params['Si1132_PARAM_ALSIRADCMISC_RANGE'])
time.sleep(0.01)
self.writeParam(params['Si1132_PARAM_ALSIRADCGAIN'], 0)
time.sleep(0.01)
self.writeParam(params['Si1132_PARAM_ALSIRADCCOUNTER'], params['Si1132_PARAM_ADCCOUNTER_511CLK'])
self.writeParam(params['Si1132_PARAM_ALSVISADCMISC'], params['Si1132_PARAM_ALSVISADCMISC_VISRANGE'])
time.sleep(0.01)
self.write_reg8(regs['Si1132_REG_MEASRATE0'], 0xFF)
self.write_reg8(regs['Si1132_REG_COMMAND'], cmds['Si1132_ALS_AUTO'])
def reset(self):
self.write_reg8(regs['Si1132_REG_MEASRATE0'], 0)
self.write_reg8(regs['Si1132_REG_MEASRATE1'], 0)
self.write_reg8(regs['Si1132_REG_IRQEN'], 0)
self.write_reg8(regs['Si1132_REG_IRQMODE1'], 0)
self.write_reg8(regs['Si1132_REG_IRQMODE2'], 0)
self.write_reg8(regs['Si1132_REG_INTCFG'], 0)
self.write_reg8(regs['Si1132_REG_IRQSTAT'], 0xFF)
self.write_reg8(regs['Si1132_REG_COMMAND'], cmds['Si1132_RESET'])
time.sleep(0.01)
self.write_reg8(regs['Si1132_REG_HWKEY'], 0x17)
time.sleep(0.01)
def read_reg8(self, reg):
return self.bus.read_byte_data(SI1132_I2C_ADDR, reg)
def read_reg16(self, reg):
return self.bus.read_word_data(SI1132_I2C_ADDR, reg)
def write_reg8(self, reg, val):
self.bus.write_byte_data(SI1132_I2C_ADDR, reg, val)
def write_reg16(self, reg, val):
self.bus.write_word_data(SI1132_I2C_ADDR, reg, val)
def writeParam(self, param, val):
self.write_reg8(regs['Si1132_REG_PARAMWR'], val)
self.write_reg8(regs['Si1132_REG_COMMAND'], param | cmds['Si1132_PARAM_SET'])
def readVisible(self):
time.sleep(0.01)
return ((self.read_reg16(0x22) - 256) / 0.282) * 14.5
def readIR(self):
time.sleep(0.01)
return ((self.read_reg16(0x24) - 250) / 2.44) * 14.5
def readUV(self):
time.sleep(0.01)
return self.read_reg16(0x2c)
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