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" */

Core/Src/main.c

@@ -101,7 +101,7 @@ void start_id_task(void *argument);
 int main(void)
 {
   /* USER CODE BEGIN 1 */
-
+	int status = 0;
   /* USER CODE END 1 */
 
   /* MCU Configuration--------------------------------------------------------*/
@@ -142,6 +142,10 @@ int main(void)
 	  printf("Device No. %d (Instance No: 0x%x) is %s\n", i, (unsigned int) instance_si5351[i], (ready==0) ? "ready" : "N/A");
   }
 
+
+  status = si5351_program(instance_si5351[1]);
+  printf("Device #1 gets status %d\n", status);
+
   for (int i=2; i>=0; i--) {
 	  si5351_deinit(instance_si5351[i]);
   }

Core/Src/stm32_si5351.c

@@ -23,12 +23,12 @@
 */
 typedef struct __SI5351_HandleTypeDef {
 	void *		i2c_handle;
-
-	uint32_t	xtal_frequency;
+	uint32_t	xtal_frequency;			/*!< XTAL or CLKIN frequency */
 	int			si5351_num;
 	struct __SI5351_HandleTypeDef *next;
-	uint8_t  	i2c_address;
-	uint8_t		initialized:1;
+	uint8_t  	i2c_address;			/*!< I2C address of the datasheet	*/
+	// uint8_t		interrupt_status_mask;	/*!< Reg 2:	Interrupt Status Mask	*/
+	uint8_t		initialized:1;			/*!< mark the driver initialized	*/
 } si5351_HandleTypeDef;
 
 /* Private define ------------------------------------------------------------*/
@@ -39,6 +39,34 @@ int si5351_errno = 0;	/* error_number for functions whith return == NULL	  */
 /* Private function prototypes -----------------------------------------------*/
 /* Private functions ---------------------------------------------------------*/
 
+/* wrapper function for receiving bytes from I2C bus
+ */
+
+static int si5351_error_status_i2c(HAL_StatusTypeDef status) {
+	switch (status) {
+		case HAL_TIMEOUT: return -ETIMEDOUT; break;
+		case HAL_ERROR: return -EIO; break;
+		case HAL_BUSY: return -EBUSY; break;
+		default: return 0;
+	}
+}
+
+int si5351_read(si5351_inst_t instance, uint8_t regaddr, uint8_t *data, uint16_t size) {
+
+	HAL_StatusTypeDef status;
+	status = HAL_I2C_Mem_Read(instance->i2c_handle, instance->i2c_address<<1,
+				(uint16_t)regaddr, I2C_MEMADD_SIZE_8BIT, data, size, 0xffff);
+	return si5351_error_status_i2c(status);
+}
+
+int si5351_write(si5351_inst_t instance, uint8_t regaddr, uint8_t *data, uint16_t size) {
+
+	HAL_StatusTypeDef status;
+	status = HAL_I2C_Mem_Write(instance->i2c_handle, instance->i2c_address<<1,
+				(uint16_t)regaddr, I2C_MEMADD_SIZE_8BIT, data, size, 0xffff);
+	return si5351_error_status_i2c(status);
+}
+
 /**	@brief Initialize the device Si5351 with the main parameters
  * 	@param i2c_handle	the handle of the I2C bus from HAL function, e.g. hi2c1
  * 	@param xtal_frequency	either the XTAL frequency (25/27 MHz) or CLock-In
@@ -56,10 +84,6 @@ si5351_HandleTypeDef *si5351_init(void * i2c_handle, uint32_t xtal_frequency, ui
 		return NULL;
 	}
 
-#ifdef HAL_I2C_MODULE_ENABLED
-
-#endif
-
 	si5351_handle = calloc(1, sizeof(*si5351_handle));
 	if (si5351_handle == NULL) {
 		si5351_errno = ENOMEM;	// cannot allocate any memory
@@ -125,7 +149,7 @@ int si5351_deinit(si5351_HandleTypeDef * si5351_handle) {
 	return 0;
 }
 
-/**	@brief Check if there is the I2C device ready on the bus
+/**	@brief Check if there is any I2C device ready on the bus
  * 	@param si5351_instance	Given si5351 device handle
  *	@return	0 on success (HAL_StatusTypeDef)
  *	@retval	HAL_ERROR = 0x01
@@ -144,6 +168,42 @@ int si5351_isready(si5351_inst_t inst) {
 	/* @TODO: create a pointer to that function for more flexiblity using other tools as HAL */
 	return status;
 }
+
+int si5351_program(si5351_inst_t inst) {
+
+	uint8_t data;
+	int status = 0;
+
+	if(!inst)
+		return -EINVAL;
+
+	do {
+		status = si5351_read(inst, SI5351_DEVICE_STATUS, &data, 1);
+		if (status)
+			return status;
+
+	} while(data & SI5351_SYS_INIT);
+
+	/* Disable Outputs Set CLKx_DIS high, Reg. 3 = 0xFF */
+	data = 0xff;
+	status = si5351_write(inst, SI5351_OUTPUT_ENABLE_CONTROL, &data, 1);
+	if (status)
+		return status;
+
+	/* power down all output drivers reg 16 -- 23 */
+	data = 0x80;
+	for(int i = SI5351_CLK0_CONTROL; i <= SI5351_CLK7_CONTROL; i++) {
+		status = si5351_write(inst, i, &data, 1);
+		if (status)
+			return status;
+	}
+
+
+
+
+	return 0;
+}
+
 #if 0