Tool/software:
Hello,
I am trying to connect the VL53L0X Time-of-Flight (ToF) sensor to the MSPM0G3507 LaunchPad using I2C. The sensor is connected as follows:
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VCC → 3.3V
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GND → GND
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SCL → PB2
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SDA → PB3
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GPIO1 → Not connected
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XSHUT → 3.3V
I am using the I2C driver example from:
C:\ti\mspm0_sdk_2_04_00_06\examples\rtos\LP_MSPM0G3507\drivers\i2c_tmp
Modifications Made:
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Changed the I2C slave address to match the VL53L0X sensor.
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The example supports two sensors, but I commented out the code for the second sensor.
I need to determine which memory address to read from the VL53L0X sensor to retrieve distance measurements correctly.
I have attached my full code below. Could you help me identify the correct memory address to read for distance data?
/* * ======== i2ctmp.c ======== */ #include <stddef.h> #include <stdint.h> #include <unistd.h> /* Driver Header files */ #include <ti/display/DisplayUart.h> #include <ti/drivers/GPIO.h> #include <ti/drivers/I2C.h> /* Driver configuration */ #include "ti_drivers_config.h" /* Temperature result registers */ #define TMP11X_RESULT_REG 0xc0 /* I2C target addresses */ #define TMP11X_BASSENSORS_ADDR 0x29 //#define TMP116_LAUNCHPAD_ADDR 0x49 /* Number of supported sensor iterations */ #define TMP_COUNT 1 uint8_t gBuffer[CONFIG_UART_BUFFER_LENGTH] = {0}; /* * Data structure containing currently supported I2C TMP sensors. * Sensors are ordered by descending preference. */ static const struct { uint8_t address; uint8_t resultReg; char *id; } sensors[TMP_COUNT] = {{TMP11X_BASSENSORS_ADDR, TMP11X_RESULT_REG, "11X"}}; // {TMP116_LAUNCHPAD_ADDR, TMP11X_RESULT_REG, "116"}}; static uint8_t targetAddress; static Display_Handle display; static void i2cErrorHandler( I2C_Transaction *transaction, Display_Handle display); /* * ======== mainThread ======== */ void *mainThread(void *arg0) { uint16_t sample; int16_t temperature; uint8_t txBuffer[1]; uint8_t rxBuffer[2]; int8_t i; I2C_Handle i2c; I2C_Params i2cParams; I2C_Transaction i2cTransaction; /* Call driver init functions */ Display_init(); GPIO_init(); I2C_init(); /* Configure the LED and if applicable, the TMP_EN pin */ GPIO_setConfig(CONFIG_GPIO_LED_0, GPIO_CFG_OUT_STD | GPIO_CFG_OUT_HIGH | CONFIG_GPIO_LED_0_IOMUX); #ifdef CONFIG_GPIO_TMP_EN GPIO_setConfig(CONFIG_GPIO_TMP_EN, GPIO_CFG_OUT_STD | GPIO_CFG_OUT_HIGH | CONFIG_GPIO_TMP_EN_IOMUX); /* Allow the sensor to power on */ sleep(1); #endif /* Open the UART display for output */ display = Display_open(Display_Type_UART, NULL); if (display == NULL) { while (1) { } } /* Turn on user LED to indicate successful initialization */ GPIO_write(CONFIG_GPIO_LED_0, CONFIG_LED_ON); Display_printf(display, 0, 0, "Starting the i2ctmp example\n"); /* Create I2C for usage */ I2C_Params_init(&i2cParams); i2cParams.bitRate = I2C_100kHz; i2c = I2C_open(CONFIG_I2C_TMP, &i2cParams); if (i2c == NULL) { Display_printf(display, 0, 0, "Error Initializing I2C\n"); while (1) { } } else { Display_printf(display, 0, 0, "I2C Initialized!\n"); } /* Common I2C transaction setup */ i2cTransaction.writeBuf = txBuffer; i2cTransaction.writeCount = 1; i2cTransaction.readBuf = rxBuffer; i2cTransaction.readCount = 0; /* * Determine which I2C sensors are present by querying known I2C * target addresses. */ for (i = TMP_COUNT - 1; i >= 0; i--) { i2cTransaction.targetAddress = sensors[i].address; txBuffer[0] = sensors[i].resultReg; if (I2C_transfer(i2c, &i2cTransaction)) { targetAddress = sensors[i].address; Display_printf(display, 0, 0, "Detected TMP%s sensor with target" " address 0x%x", sensors[i].id, sensors[i].address); } else { i2cErrorHandler(&i2cTransaction, display); } } /* If we never assigned a target address */ if (targetAddress == 0) { Display_printf(display, 0, 0, "Failed to detect a sensor!"); I2C_close(i2c); while (1) { } } Display_printf(display, 0, 0, "\nUsing last known sensor for samples."); i2cTransaction.targetAddress = targetAddress; /* Take 20 samples and print them out onto the console */ for (sample = 0; sample < 20; sample++) { i2cTransaction.readCount = 2; if (I2C_transfer(i2c, &i2cTransaction)) { /* * Extract degrees C from the received data; * see TMP sensor datasheet */ temperature = (rxBuffer[0] << 8) | (rxBuffer[1]); // temperature *= 0.0078125; Display_printf( display, 0, 0, "Sample %u: %d C", sample, temperature); } else { i2cErrorHandler(&i2cTransaction, display); } /* Sleep for 1 second */ sleep(1); } Display_printf(display, 0, 0, "I2C closed!"); I2C_close(i2c); return (NULL); } /* * ======== i2cErrorHandler ======== */ static void i2cErrorHandler( I2C_Transaction *transaction, Display_Handle display) { switch (transaction->status) { case I2C_STATUS_TIMEOUT: Display_printf(display, 0, 0, "I2C transaction timed out!"); break; case I2C_STATUS_CLOCK_TIMEOUT: Display_printf(display, 0, 0, "I2C serial clock line timed out!"); break; case I2C_STATUS_ADDR_NACK: Display_printf(display, 0, 0, "I2C target address 0x%x not" " acknowledged!", transaction->targetAddress); break; case I2C_STATUS_DATA_NACK: Display_printf(display, 0, 0, "I2C data byte not acknowledged!"); break; case I2C_STATUS_ARB_LOST: Display_printf( display, 0, 0, "I2C arbitration to another controller!"); break; case I2C_STATUS_INCOMPLETE: Display_printf( display, 0, 0, "I2C transaction returned before completion!"); break; case I2C_STATUS_BUS_BUSY: Display_printf(display, 0, 0, "I2C bus is already in use!"); break; case I2C_STATUS_CANCEL: Display_printf(display, 0, 0, "I2C transaction cancelled!"); break; case I2C_STATUS_INVALID_TRANS: Display_printf(display, 0, 0, "I2C transaction invalid!"); break; case I2C_STATUS_ERROR: Display_printf(display, 0, 0, "I2C generic error!"); break; default: Display_printf(display, 0, 0, "I2C undefined error case!"); break; } }
