add i2c write block data

wiringPi/wiringPiI2C.c

@@ -189,6 +189,18 @@ int wiringPiI2CWriteReg16 (int fd, int reg, int value)
   return i2c_smbus_access (fd, I2C_SMBUS_WRITE, reg, I2C_SMBUS_WORD_DATA, &data) ;
 }
 
+int wiringPiI2CWriteBlockData (int fd, int size, int reg, uint8_t *value)
+{
+    union i2c_smbus_data data ;
+
+    data.block[0] = size;
+    for(int i=0; i < size; i++) {
+        data.block[i+1] = value[i];
+    }
+
+    return i2c_smbus_access (fd, I2C_SMBUS_WRITE, reg, I2C_SMBUS_BLOCK_DATA, &data) ;
+}
+
 
 /*
  * wiringPiI2CSetupInterface:

wiringPi/wiringPiI2C.h

@@ -21,6 +21,8 @@
  *    If not, see <http://www.gnu.org/licenses/>.
  ***********************************************************************
  */
+#include <stdlib.h>
+#include <stdint.h>
 
 #ifdef __cplusplus
 extern "C" {
@@ -37,6 +39,8 @@ extern int wiringPiI2CWriteReg16     (int fd, int reg, int data) ;
 extern int wiringPiI2CSetupInterface (const char *device, int devId) ;
 extern int wiringPiI2CSetup          (const int devId) ;
 
+extern int wiringPiI2CWriteBlockData (int fd, int size, int reg, uint8_t *value);
+
 #ifdef __cplusplus
 }
 #endif