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OPT3004EVM[原理圖下載]

LAUNCHXL-CC1352P[原理圖下載]

SDA

DIO5

SCK

DIO22

VOUT

3V3

GND

GND

請根據實際板子情況進行連接，CC1352P的DIO5和DIO22已通過3.3KΩ電阻上拉，因此直接使用這兩個引腳。

Constants

ALS_CFG_ONE_SHOOT  

0xC210  

OPT3004 configuration triggering 100ms single conversion

ALS_CFG_RESET

0xC810

OPT3004 configuration at reset (shutdown)

ALS_I2C_ADDR

0x0088

OPT3004 I2C address

ALS_REG_CFG

1

OPT3004 configuration register[配置寄存器 1]

ALS_REG_RESULT

0

OPT3004 result register[結果寄存器 0]

DataStructures

cfg.highThreshold

65535  

High alert threshold

cfg.lowThreshold

0

Low alert threshold

• output. value

0

Light sensor output value

Task Resources

Serial Interfaces

I2C Master

System CPU Communication

System CPU alert

Task Event Handling

Timer 1 Event Trigger

Task Execution

RTC-based Execution Scheduling

IO Mapping

DIO22 – I2C SCL   DIO5 – I2C SDA

代碼

Initialization Code

// Schedule the first execution

fwScheduleTask(1);

Execution Code

// Configure and start the next measurement

i2cStart();

i2cTx(I2C_OP_WRITE | ALS_I2C_ADDR); //

i2cTx(ALS_REG_CFG);

i2cTx(ALS_CFG_ONE_SHOT >> 8);

i2cTx(ALS_CFG_ONE_SHOT >> 0);

i2cStop();

// Read the result after 100 milliseconds + a 20% margin

evhSetupTimer1Trigger(0, 120, 2);

// Schedule the next execution

fwScheduleTask(1);

Event Handler A Code

// If a measurement was successfully started during the last execution ...

if (state.i2cStatus == 0x0000) {

       // Select the result register

       i2cStart();

       i2cTx(I2C_OP_WRITE | ALS_I2C_ADDR);

       i2cTx(ALS_REG_RESULT);

       // If successful

       if (state.i2cStatus == 0x0000) {

               U16 resultRegH;

               U16 resultRegL;

              // Read the result

               i2cRepeatedStart();

               i2cTx(I2C_OP_READ | ALS_I2C_ADDR);

               i2cRxAck(resultRegH);

               i2cRxNack(resultRegL);

               i2cStop();

               // Convert the result (4-bit exponent + 12-bit mantissa) into 16-bit fixed-point

               U16 exp = resultRegH >> 4;

               U16 mant = (resultRegH << 12) | (resultRegL << 4);

               // The exponent is in range 0 to 11

               U16 value = mant >> (11 - exp);

               output.value = value;

               // Notify the application

               if (value < cfg.lowThreshold) {

                       fwGenalertInterrupt();

               }

               if (value > cfg.highThreshold) {

                       fwGenalertInterrupt();

               }

   } else {

               i2cStop();

               }

}

Termination Code

// Shut down the light sensor

i2cStart();

i2cTx(I2C_OP_WRITE | ALS_I2C_ADDR);

i2cTx(ALS_REG_CFG);

i2cTx(ALS_CFG_RESET >> 8);

i2cTx(ALS_CFG_RESET >> 0);

i2cStop();

// Cancel the potentially active event trigger

evhCancelTrigger(0);

30秒連續運行下，平均電流20uA ,使用CR2032 200mAh的電池，評估可運行一年三個月。