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Dependencies: X_NUCLEO_COMMON ST_INTERFACES
vl53L1x_I2c.h
- Committer:
- dmathew
- Date:
- 2019-05-17
- Revision:
- 6:aa13392d16bb
- Parent:
- 5:f16727052990
File content as of revision 6:aa13392d16bb:
/* Define to prevent from recursive inclusion --------------------------------*/
#ifndef __DEV_53L1X_I2C_H
#define __DEV_53L1X_I2C_H
/* Includes ------------------------------------------------------------------*/
#include "mbed.h"
#include "pinmap.h"
//Class replacing DevI2C class as it was not implementing a 16bit address registers
class vl53L1X_DevI2C : public I2C
{
public:
/** Create a DevI2C Master interface, connected to the specified pins
*
* @param sda I2C data line pin
* @param scl I2C clock line pin
*/
vl53L1X_DevI2C(PinName sda, PinName scl) : I2C(sda, scl) {}
/**
* @brief Writes a buffer towards the I2C peripheral device.
* @param pBuffer pointer to the byte-array data to send
* @param DeviceAddr specifies the peripheral device slave address.
* @param RegisterAddr specifies the internal address register
* where to start writing to (must be correctly masked).
* @param NumByteToWrite number of bytes to be written.
* @retval 0 if ok,
* @retval -1 if an I2C error has occured, or
* @retval -2 on temporary buffer overflow (i.e. NumByteToWrite was too high)
* @note On some devices if NumByteToWrite is greater
* than one, the RegisterAddr must be masked correctly!
*/
int v53l1x_i2c_write(uint8_t* pBuffer, uint8_t DeviceAddr, uint16_t RegisterAddr,
uint16_t NumByteToWrite) {
int ret;
uint8_t tmp[TEMP_BUF_SIZE];
if(NumByteToWrite >= TEMP_BUF_SIZE) return -2;
/* First, send device address. Then, send data and STOP condition */
tmp[0] = RegisterAddr >> 8;
tmp[1] = RegisterAddr & 0x0FF;
memcpy(tmp+2, pBuffer, NumByteToWrite);
ret = write(DeviceAddr, (const char*)tmp, NumByteToWrite+2, false);
if(ret) return -1;
return 0;
}
/**
* @brief Reads a buffer from the I2C peripheral device.
* @param pBuffer pointer to the byte-array to read data in to
* @param DeviceAddr specifies the peripheral device slave address.
* @param RegisterAddr specifies the internal address register
* where to start reading from (must be correctly masked).
* @param NumByteToRead number of bytes to be read.
* @retval 0 if ok,
* @retval -1 if an I2C error has occured
* @note On some devices if NumByteToWrite is greater
* than one, the RegisterAddr must be masked correctly!
*/
int v53l1x_i2c_read(uint8_t* pBuffer, uint8_t DeviceAddr, uint16_t RegisterAddr,
uint16_t NumByteToRead) {
int ret;
uint8_t ExpanderData[2];
ExpanderData[0] = RegisterAddr >> 8;
ExpanderData[1] = RegisterAddr & 0x0FF;
/* Send device address, with no STOP condition */
ret = write(DeviceAddr, (const char*)ExpanderData, 2, true);
if(!ret) {
/* Read data, with STOP condition */
ret = read(DeviceAddr, (char*)pBuffer, NumByteToRead, false);
}
if(ret) return -1;
return 0;
}
private:
static const unsigned int TEMP_BUF_SIZE = 32;
};
#endif /* __DEV_53L1X_I2C_H */