Diff: drv_I2C_M24SR_mbed.cpp

Revision:

3:0528e68eac4a

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/drv_I2C_M24SR_mbed.cpp	Wed Dec 17 00:32:28 2014 +0000
@@ -0,0 +1,204 @@
+/**
+  ******************************************************************************
+  * @file    drv_I2C_M24SR_mbed.cpp
+  * @author  MMY Application Team
+  * @version V1.0.0
+  * @date    19-March-2014
+  * @brief   This file provides a set of functions needed to manage the I2C of
+	*				   the M24SR device.
+ ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT 2014 STMicroelectronics</center></h2>
+  *
+  * Licensed under MMY-ST Liberty SW License Agreement V2, (the "License");
+  * You may not use this file except in compliance with the License.
+  * You may obtain a copy of the License at:
+  *
+  *        http://www.st.com/software_license_agreement_liberty_v2
+  *
+  * Unless required by applicable law or agreed to in writing, software 
+  * distributed under the License is distributed on an "AS IS" BASIS, 
+  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  * See the License for the specific language governing permissions and
+  * limitations under the License.
+  *
+  ******************************************************************************
+  */
+
+/* Includes ------------------------------------------------------------------*/
+#include "drv_I2C_M24SR.h"
+#include "mbed.h"
+
+#define M24SR_SDA_PIN                                                       D14
+#define M24SR_SCL_PIN                                                       D15
+#define M24SR_GPO_PIN                                                       D12
+#define M24SR_RFDIS_PIN                                                     D11
+
+#if defined	__MBED__					  /* F4 */
+	#define M24SR_I2C_SPEED_10														10000
+	#define M24SR_I2C_SPEED_100														100000
+	#define M24SR_I2C_SPEED_400														400000
+	#define M24SR_I2C_SPEED_1000												M24SR_I2C_SPEED_400 // 1MHz I2C not supported by mbed
+#else
+	#error "Use only for mbed"
+#endif
+	
+#define M24SR_I2C_SPEED				M24SR_I2C_SPEED_400
+
+/* MBED objects */
+I2C i2c(I2C_SDA, I2C_SCL);
+DigitalOut pRFD(M24SR_RFDIS_PIN);
+DigitalIn pGPO(M24SR_GPO_PIN);
+
+static uint8_t						uSynchroMode = M24SR_WAITINGTIME_POLLING;
+
+/**
+  * @brief  This function initializes the M24SR_I2C interface
+	* @retval None  
+  */
+void M24SR_I2CInit(void)
+{
+	i2c.frequency(M24SR_I2C_SPEED);
+	pRFD.write(0);
+	pGPO.mode(PullNone);
+}
+
+/**
+  * @brief  this functions configure I2C synchronization mode
+	* @param  mode : 
+  * @retval None
+  */
+void M24SR_SetI2CSynchroMode(uint8_t mode)
+{
+#if defined (I2C_GPO_SYNCHRO_ALLOWED)
+	uSynchroMode = mode;
+#else
+	if(mode == M24SR_WAITINGTIME_GPO || mode == M24SR_INTERRUPT_GPO)
+		uSynchroMode = M24SR_WAITINGTIME_POLLING;
+	else
+		uSynchroMode = mode;
+#endif /*  I2C_GPO_SYNCHRO_ALLOWED */
+}
+
+/**
+  * @brief  This functions polls the I2C interface
+  * @retval M24SR_STATUS_SUCCESS : the function is succesful
+	* @retval M24SR_ERROR_I2CTIMEOUT : The I2C timeout occured. 
+  */
+int8_t M24SR_PollI2C(void)
+{
+	int status = 1;
+	uint32_t nbTry = 0;
+	char buffer;
+	// 
+	wait_ms(M24SR_POLL_DELAY);
+	while (status != 0 && nbTry < M24SR_I2C_POLLING)
+	{
+		status = i2c.read(M24SR_ADDR, &buffer, 1, false);
+		nbTry++;
+	}
+	if (status == 0)
+		return M24SR_STATUS_SUCCESS;
+	else
+	{
+		return M24SR_ERROR_I2CTIMEOUT;
+	}
+}
+
+/**
+  * @brief  This functions reads a response of the M24SR device
+	* @param  NbByte : Number of byte to read (shall be >= 5)
+  * @param  pBuffer : Pointer to the buffer to send to the M24SR
+  * @retval M24SR_STATUS_SUCCESS : The function is succesful
+	* @retval M24SR_ERROR_I2CTIMEOUT : The I2C timeout occured. 
+  */
+int8_t M24SR_ReceiveI2Cresponse(uint8_t NbByte, uint8_t *pBuffer)
+{
+	if (i2c.read(M24SR_ADDR, (char*)pBuffer, NbByte, false) == 0)
+		return M24SR_STATUS_SUCCESS;
+	else
+		return M24SR_ERROR_I2CTIMEOUT;
+}
+
+/**
+  * @brief  This functions sends the command buffer 
+	* @param  NbByte : Number of byte to send
+  * @param  pBuffer : pointer to the buffer to send to the M24SR
+  * @retval M24SR_STATUS_SUCCESS : the function is succesful
+	* @retval M24SR_ERROR_I2CTIMEOUT : The I2C timeout occured. 
+  */
+int8_t M24SR_SendI2Ccommand(uint8_t NbByte ,uint8_t *pBuffer)
+{
+	if (i2c.write(M24SR_ADDR, (char*)pBuffer, NbByte, false) == 0)
+	{
+		return M24SR_STATUS_SUCCESS;
+	}
+	else
+	{
+		return M24SR_ERROR_I2CTIMEOUT;
+	}
+}
+
+/**
+  * @brief  This functions returns M24SR_STATUS_SUCCESS when a response is ready
+  * @retval M24SR_STATUS_SUCCESS : a response of the M24LR is ready
+	* @retval M24SR_ERROR_DEFAULT : the response of the M24LR is not ready
+  */
+int8_t M24SR_IsAnswerReady(void)
+{
+	uint16_t status ;
+	uint32_t retry = 0xFFFFF;
+	uint8_t stable = 0;
+	
+	switch (uSynchroMode)
+	{
+			case M24SR_WAITINGTIME_POLLING :
+				errchk(M24SR_PollI2C ( ));
+				return M24SR_STATUS_SUCCESS;
+			
+			case M24SR_WAITINGTIME_TIMEOUT :
+				// M24SR FWI=5 => (256*16/fc)*2^5=9.6ms but M24SR ask for extended time to program up to 246Bytes.
+				// can be improved by 
+				wait_ms(80);	
+				return M24SR_STATUS_SUCCESS;
+
+			case M24SR_WAITINGTIME_GPO :
+				do
+				{
+					if(pGPO.read() == 0)
+					{
+						stable ++;
+					}
+					retry --;						
+				}
+				while(stable <5 && retry>0);
+				if(!retry)
+					goto Error;				
+				return M24SR_STATUS_SUCCESS;
+				
+			default : 
+				return M24SR_ERROR_DEFAULT;
+		}
+
+Error :
+		return M24SR_ERROR_DEFAULT;
+}
+
+/**
+  * @brief  This function enable or disable RF communication
+	* @param	OnOffChoice: GPO configuration to set
+  */
+void M24SR_RFConfig_Hard(uint8_t OnOffChoice)
+{
+	/* Disable RF */
+	if ( OnOffChoice != 0 )
+	{	
+		pRFD = 0;
+	}
+	else
+	{	
+		pRFD = 1;
+	}
+}
+