Diff: VL53L1X_I2C.h

Revision:

7:6d3ab15363a2

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/VL53L1X_I2C.h	Wed Jul 24 10:36:51 2019 +0000
@@ -0,0 +1,89 @@
+/* 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 */