How do I verify I have my I2C configured correctly for the VL53L5CX?

[John E KVAM · Accepted solution]

Here is a function. Put it at the top of your program. When it runs correctly, you can remove it secure that your I2C is not byte or word swapped.

/* --------------------------------------------------
 * --- This function can be used to test VL53L5CX I2C 
 * --------------------------------------------------
 */
 
uint8_t vl53l5cx_test_i2c(VL53L5CX_Configuration *p_dev){
	uint8_t status = VL53L5CX_STATUS_OK;
	printf("Starting VL53L5CX I2C test...\n");
 
/* To check the I2C RdByte/WrByte function :
 * Inside the function “vl53l5cx_is_alive()�?, it will call I2C RdByte/WrByte to
 * read device and verion ID. which can help you to verify the I2C RdByte/WrByte
 * functions at same time.
 */
	uint8_t device_id, revision_id;
	status |= WrByte(&(p_dev->platform), 0x7fff, 0x00);
	status |= RdByte(&(p_dev->platform), 0, &device_id);
	status |= RdByte(&(p_dev->platform), 1, &revision_id);
	status |= WrByte(&(p_dev->platform), 0x7fff, 0x02);
 
	if(status)
	{
		printf("Error Rd/Wr byte: status %u\n", status);
		return status;
	}
 
/* To check the I2C RdMulti/WrMulti function:
 * Below is example codes which can help you vefify the I2C RdMulti/WrMulti
 * function.
 */
 
	uint8_t Data_write[4]={0x5A,0xA5,0xAA,0x55};
	uint8_t Data_read[4]={0,0,0,0};
	uint8_t Data_default[4]={0,0,0,0};
 
	status |= RdMulti(&(p_dev->platform), 0x100, Data_default, 4);
	if(status)
	{
		printf("Error RdMulti: status %u\n", status);
		return status;
	}
 
	printf("Read default value and save it at begging\n");
	printf("Data_default (0x%x)\n", Data_default[0]);
	printf("Data_default (0x%x)\n", Data_default[1]);
	printf("Data_default (0x%x)\n", Data_default[2]);
	printf("Data_default (0x%x)\n", Data_default[3]);
 
	status |= WrMulti(&(Dev.platform), 0x100, Data_write, 4);
	if(status)
	{
		printf("Error WrMulti: status %u\n", status);
		return status;
	}
	printf("Writing values 0x5A 0xA5 0xAA 0x55\n");
 
	status |= RdMulti(&(p_dev->platform), 0x100, Data_read, 4);
	if(status)
	{
		printf("Error RdMulti: status %u\n", status);
		return status;
	}
 
	printf("Reading:\n");
	printf("Data_read (0x%x)\n", Data_read[0]);
	printf("Data_read (0x%x)\n", Data_read[1]);
	printf("Data_read (0x%x)\n", Data_read[2]);
	printf("Data_read (0x%x)\n", Data_read[3]);
 
 
	status |= WrMulti(&(Dev.platform), 0x100, Data_default, 4);
	printf("Write back default value\n");
	if(status)
	{
		printf("Error WrMulti: status %u\n", status);
		return status;
	}
 
	status |= RdMulti(&(Dev.platform), 0x100, Data_default, 4);
	if(status)
	{
		printf("Error RdMulti: status %u\n", status);
		return status;
	}
 
	printf("Read value again to make sure default value was correct loaded\n");
	printf("Data_default (0x%x)\n", Data_default[0]);
	printf("Data_default (0x%x)\n", Data_default[1]);
	printf("Data_default (0x%x)\n", Data_default[2]);
	printf("Data_default (0x%x)\n", Data_default[3]);
 
	printf("I2C test done - everything works fine.\n");
 
	return status;
}