ADD read and write wrapper function for i2c bus, start programming

procedure for si5351

Core/Inc/stm32_si5351.h

@@ -81,7 +81,7 @@ extern "C" {
 
 /* Includes ------------------------------------------------------------------*/
 #include <stdint.h>
-
+#include <stm32_si5351_reg.h>	/* register map of the Si5351 */
 /* Private includes ----------------------------------------------------------*/
 
 /* Exported types ------------------------------------------------------------*/
@@ -89,14 +89,17 @@ extern "C" {
 typedef struct __SI5351_HandleTypeDef *si5351_inst_t;
 
 /* Exported constants --------------------------------------------------------*/
-/** @enum errno_t Error Number Constants
+/** @enum errno_t Error Number Constants,  @TODO could also errno.h included!!
  */
 typedef enum {
 	EPERM	=  1,	/*!< Operation not permitted	*/
+	EIO		=  5,	/*!< I/O error	*/
 	ENOMEM	= 12,	/*!< Out of memory		*/
 	ENODEV	= 19,	/*!< No such device 	*/
+	EBUSY 	= 16,	/*!< Device or resource busy	*/
 	EINVAL	= 22,	/*!< Invalid argument	*/
-	EADDRINUSE = 98	/*!< Address already in use	*/
+	EADDRINUSE = 98,/*!< Address already in use	*/
+	ETIMEDOUT = 116	/*!< Connection timed out	*/
 } si5351_errno_t;
 
 /* Exported variables --------------------------------------------------------*/
@@ -107,6 +110,7 @@ typedef enum {
 si5351_inst_t si5351_init(void * i2c_handle, uint32_t xtal_frequency, uint8_t i2c_address);
 int si5351_deinit(si5351_inst_t si5351_handle);
 int si5351_isready(si5351_inst_t inst);
+int si5351_program(si5351_inst_t inst);
 
 #ifdef __cplusplus
 } /* extern "C" */