VL6180X_REG_RESULT_INTERRUPT_STATUS_GPIO always 0

QZH · ‎2023-10-20

when I use vl6810 with 51 chip , the i2c use pull up to 1.8V 。

all the init register is correctly， I Using an oscilloscope for detection ，It seems all correct。

but it always wait at VL6180X_REG_RESULT_INTERRUPT_STATUS_GPIO here ：

while(!(VL6180X_ReadByte(VL6180X_REG_RESULT_INTERRUPT_STATUS_GPIO)&0x04));

it always read 0 ，It took me a long time and I couldn't find where the problem

But if I use STM32 as the MCU, everything will be fine。

QZH · ‎2023-10-20

The code is as follows：

uint8_t VL6180X_Init(void)

{

if(VL6180X_Read_ID() == VL6180X_DEFAULT_ID)

{

VL6180X_WriteByte(0x0207, 0x01);

VL6180X_WriteByte(0x0208, 0x01);

VL6180X_WriteByte(0x0096, 0x00);

VL6180X_WriteByte(0x0097, 0xfd);

VL6180X_WriteByte(0x00e3, 0x00);

VL6180X_WriteByte(0x00e4, 0x04);

VL6180X_WriteByte(0x00e5, 0x02);

VL6180X_WriteByte(0x00e6, 0x01);

VL6180X_WriteByte(0x00e7, 0x03);

VL6180X_WriteByte(0x00f5, 0x02);

VL6180X_WriteByte(0x00d9, 0x05);

VL6180X_WriteByte(0x00db, 0xce);

VL6180X_WriteByte(0x00dc, 0x03);

VL6180X_WriteByte(0x00dd, 0xf8);

VL6180X_WriteByte(0x009f, 0x00);

VL6180X_WriteByte(0x00a3, 0x3c);

VL6180X_WriteByte(0x00b7, 0x00);

VL6180X_WriteByte(0x00bb, 0x3c);

VL6180X_WriteByte(0x00b2, 0x09);

VL6180X_WriteByte(0x00ca, 0x09);

VL6180X_WriteByte(0x0198, 0x01);

VL6180X_WriteByte(0x01b0, 0x17);

VL6180X_WriteByte(0x01ad, 0x00);

VL6180X_WriteByte(0x00ff, 0x05);

VL6180X_WriteByte(0x0100, 0x05);

VL6180X_WriteByte(0x0199, 0x05);

VL6180X_WriteByte(0x01a6, 0x1b);

VL6180X_WriteByte(0x01ac, 0x3e);

VL6180X_WriteByte(0x01a7, 0x1f);

VL6180X_WriteByte(0x0030, 0x00);

// Recommended : Public registers - See data sheet for more detail

VL6180X_WriteByte(0x0011, 0x10); // Enables polling for 'New Sample ready'

// when measurement completes

VL6180X_WriteByte(0x010a, 0x30); // Set the averaging sample period

// (compromise between lower noise and

// increased execution time)

VL6180X_WriteByte(0x003f, 0x46); // Sets the light and dark gain (upper

// nibble). Dark gain should not be

// changed. !???????0x4 ?????1.0

VL6180X_WriteByte(0x0031, 0xFF); // sets the # of range measurements after

// which auto calibration of system is

// performed

VL6180X_WriteByte(0x0040, 0x63); // Set ALS integration time to 100ms

VL6180X_WriteByte(0x002e, 0x01); // perform a single temperature calibration

// of the ranging sensor

// Optional: Public registers - See data sheet for more detail

VL6180X_WriteByte(0x001b, 0x09); //???? ????

// period to 100ms ??10ms->0-10ms

VL6180X_WriteByte(0x003e, 0x31); //???? ALS??

// to 500ms

VL6180X_WriteByte(0x0014, 0x24); // Configures interrupt on 'New Sample

// Ready threshold event'

return 0;

}

else return 1;

}

//????

uint8_t VL6180X_Read_Range(void)

{

uint8_t range = 0;

//????

while(!(VL6180X_ReadByte(VL6180X_REG_RESULT_RANGE_STATUS) & 0x01));

VL6180X_WriteByte(VL6180X_REG_SYSRANGE_START,0x01); //??????

//???????????(New Sample Ready threshold event)

while(!(VL6180X_ReadByte(VL6180X_REG_RESULT_INTERRUPT_STATUS_GPIO) & 0x04));

range = VL6180X_ReadByte(VL6180X_REG_RESULT_RANGE_VAL);

//???????????

VL6180X_WriteByte(VL6180X_REG_SYSTEM_INTERRUPT_CLEAR,0x07); //0111b ?????????

return range;

}

QZH · ‎2023-10-20

1.8V is directly pulled up, STM32 has undergone level conversion, GPIO0 is pulled up to 2.8V, GPIO1 NC