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iicps_v2_4: Added repeated start example.

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This Patch add repeated start example for iicps.

Signed-off-by: P L Sai Krishna <lakshmis@xilinx.com>
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P L Sai Krishna 2014-12-08 16:57:19 +05:30 • committed by Suneel Garapati
parent 5ae0b34872
commit 63cfac47b5
1 changed files with 468 additions and 0 deletions
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468
XilinxProcessorIPLib/drivers/iicps_v2_4/examples/xiicps_repeated_start_example.c Executable file
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/******************************************************************************
*
* Copyright (C) 2014 Xilinx, Inc. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* Use of the Software is limited solely to applications:
* (a) running on a Xilinx device, or
* (b) that interact with a Xilinx device through a bus or interconnect.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* XILINX CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
* OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Except as contained in this notice, the name of the Xilinx shall not be used
* in advertising or otherwise to promote the sale, use or other dealings in
* this Software without prior written authorization from Xilinx.
*
******************************************************************************/
/*****************************************************************************/
/**
* @file xiicps_repeated_start_example.c
*
* This file consists of a repeated start example using xiicps driver
* in polled mode. The slave used is an EEPROM.
*
* The example is tested with a 2Kb/8Kb serial IIC EEPROM (ST M24C02/M24C08).
* The WP pin of this EEPROM is hardwired to ground in the HW in which this
* was tested.
* This example can be used directly to read upto 16 pages
* from start address in this EEPROM (Since single address byte).
*
* The AddressType should be u8 as the address pointer in the on-board
* EEPROM is 1 bytes.
*
* This code assumes that no Operating System is being used.
*
* @note
*
* The I2C controller does not indicate completion of a receive transfer if HOLD
* bit is set. Due to this errata, repeated start cannot be used if a receive
* transfer is followed by any other transfer.
*
* <pre>
* MODIFICATION HISTORY:
*
* Ver Who Date Changes
* ----- ---- -------- ---------------------------------------------------------
* 2.1 hk 03/15/10 First release
*
* </pre>
*
******************************************************************************/
/***************************** Include Files *********************************/
#include "xparameters.h"
#include "sleep.h"
#include "xiicps.h"
#include "xil_printf.h"
/************************** Constant Definitions *****************************/
/*
* The following constants map to the XPAR parameters created in the
* xparameters.h file. They are defined here such that a user can easily
* change all the needed parameters in one place.
*/
#define IIC_DEVICE_ID XPAR_XIICPS_0_DEVICE_ID
/*
* The following constant defines the address of the IIC Slave device on the
* IIC bus. Note that since the address is only 7 bits, this constant is the
* address divided by 2.
*/
#define IIC_SLAVE_ADDR 0x54
#define IIC_SCLK_RATE 100000
#define IIC_MUX_ADDRESS 0x74
/*
* The page size determines how much data should be written at a time.
* The write function should be called with this as a maximum byte count.
*/
#define PAGE_SIZE 16
/*
* The Starting address in the IIC EEPROM on which this test is performed.
*/
#define EEPROM_START_ADDRESS 0
/**************************** Type Definitions *******************************/
/*
* The AddressType should be u8 as the address pointer in the on-board
* EEPROM is 1 bytes.
*/
typedef u8 AddressType;
/***************** Macros (Inline Functions) Definitions *********************/
/************************** Function Prototypes ******************************/
int IicPsRepeatedStartExample(void);
int EepromWriteData(u16 ByteCount);
int MuxInit(void);
int EepromReadDataRepStart(u8 *BufferPtr, u16 ByteCount);
/************************** Variable Definitions *****************************/
XIicPs IicInstance; /* The instance of the IIC device. */
/*
* Write buffer for writing a page.
*/
u8 WriteBuffer[sizeof(AddressType) + PAGE_SIZE];
u8 ReadBuffer[PAGE_SIZE*20]; /* Read buffer for reading a page. */
/************************** Function Definitions *****************************/
/*****************************************************************************/
/**
* Main function to call the Iic repeated start example.
*
* @param None.
*
* @return XST_SUCCESS if successful else XST_FAILURE.
*
* @note None.
*
******************************************************************************/
int main(void)
{
int Status;
xil_printf("IIC Repeated Start Example Test \r\n");
/*
* Run the Iic repeated start example.
* Refer to note in the header - repeated start cannot be used
* if read transfer is followed by any other transfer.
*/
Status = IicPsRepeatedStartExample();
if (Status != XST_SUCCESS) {
xil_printf("IIC Repeated Start Example Test Failed\r\n");
return XST_FAILURE;
}
xil_printf("Successfully ran IIC Repeated Start Example Test\r\n");
return XST_SUCCESS;
}
/*****************************************************************************/
/**
* This function writes, reads, and verifies the data to the IIC EEPROM.
* Page write is used. Buffered read with repeated start option is done.
*
* @param None.
*
* @return XST_SUCCESS if successful else XST_FAILURE.
*
* @note None.
*
******************************************************************************/
int IicPsRepeatedStartExample(void)
{
u32 Index;
int Status;
XIicPs_Config *ConfigPtr; /* Pointer to configuration data */
AddressType Address = EEPROM_START_ADDRESS;
AddressType AddressTemp;
int PageCnt;
int NumPages = 16;
/*
* Initialize the IIC driver so that it is ready to use.
*/
ConfigPtr = XIicPs_LookupConfig(IIC_DEVICE_ID);
if (ConfigPtr == NULL) {
return XST_FAILURE;
}
Status = XIicPs_CfgInitialize(&IicInstance, ConfigPtr,
ConfigPtr->BaseAddress);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/*
* Set the IIC serial clock rate.
*/
XIicPs_SetSClk(&IicInstance, IIC_SCLK_RATE);
/*
* Set the channel value in IIC Mux.
*/
Status = MuxInit();
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
AddressTemp = Address;
for(PageCnt = 0; PageCnt < NumPages; PageCnt++) {
/*
* Initialize the data to write and the read buffer.
*/
if (sizeof(AddressTemp) == 1) {
WriteBuffer[0] = (u8) (AddressTemp);
} else {
WriteBuffer[0] = (u8) (AddressTemp >> 8);
WriteBuffer[1] = (u8) (AddressTemp);
}
for (Index = 0; Index < PAGE_SIZE; Index++) {
WriteBuffer[sizeof(AddressTemp) + Index] = 0xFF;
ReadBuffer[Index] = 0;
}
/*
* Write to the EEPROM.
*/
Status = EepromWriteData(sizeof(AddressTemp) + PAGE_SIZE);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
AddressTemp += PAGE_SIZE;
}
/*
* Read from the EEPROM.
*/
Status = EepromReadDataRepStart(ReadBuffer, PAGE_SIZE*NumPages);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/*
* Verify the data read against the data written.
*/
for (Index = 0; Index < PAGE_SIZE*NumPages; Index++) {
if (ReadBuffer[Index] !=
WriteBuffer[Index%PAGE_SIZE + sizeof(Address)]) {
return XST_FAILURE;
}
ReadBuffer[Index] = 0;
}
AddressTemp = Address;
for(PageCnt = 0; PageCnt < NumPages; PageCnt++) {
/*
* Initialize the data to write and the read buffer.
*/
if (sizeof(AddressTemp) == 1) {
WriteBuffer[0] = (u8) (AddressTemp);
} else {
WriteBuffer[0] = (u8) (AddressTemp >> 8);
WriteBuffer[1] = (u8) (AddressTemp);
}
for (Index = 0; Index < PAGE_SIZE; Index++) {
WriteBuffer[sizeof(AddressTemp) + Index] = Index + 10;
ReadBuffer[Index] = 0;
}
/*
* Write to the EEPROM.
*/
Status = EepromWriteData(sizeof(AddressTemp) + PAGE_SIZE);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
AddressTemp += PAGE_SIZE;
}
/*
* Read from the EEPROM.
*/
Status = EepromReadDataRepStart(ReadBuffer, PAGE_SIZE*NumPages);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/*
* Verify the data read against the data written.
*/
for (Index = 0; Index < PAGE_SIZE*NumPages; Index++) {
if (ReadBuffer[Index] !=
WriteBuffer[Index%PAGE_SIZE + sizeof(Address)]) {
return XST_FAILURE;
}
ReadBuffer[Index] = 0;
}
return XST_SUCCESS;
}
/*****************************************************************************/
/**
* This function writes a buffer of data to the IIC serial EEPROM.
*
* @param ByteCount contains the number of bytes in the buffer to be
* written.
*
* @return XST_SUCCESS if successful else XST_FAILURE.
*
* @note The Byte count should not exceed the page size of the EEPROM as
* noted by the constant PAGE_SIZE.
*
******************************************************************************/
int EepromWriteData(u16 ByteCount)
{
int Status;
/*
* Send the Data.
*/
Status = XIicPs_MasterSendPolled(&IicInstance, WriteBuffer,
ByteCount, IIC_SLAVE_ADDR);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/*
* Wait until bus is idle to start another transfer.
*/
if (!(IicInstance.IsRepeatedStart)) {
while (XIicPs_BusIsBusy(&IicInstance));
}
/*
* Wait for a bit of time to allow the programming to complete
*/
usleep(250000);
return XST_SUCCESS;
}
/*****************************************************************************/
/**
* This function reads data from the IIC serial EEPROM into a specified buffer.
*
* @param BufferPtr contains the address of the data buffer to be filled.
* @param ByteCount contains the number of bytes in the buffer to be read.
*
* @return XST_SUCCESS if successful else XST_FAILURE.
*
* @note None.
*
******************************************************************************/
int EepromReadDataRepStart(u8 *BufferPtr, u16 ByteCount)
{
int Status;
AddressType Address = EEPROM_START_ADDRESS;
/*
* Enable repeated start option.
* This call will give an indication to the driver.
* The hold bit is actually set before beginning the following transfer
*/
XIicPs_SetOptions(&IicInstance, XIICPS_REP_START_OPTION);
/*
* Position the Pointer in EEPROM.
*/
if (sizeof(Address) == 1) {
WriteBuffer[0] = (u8) (Address);
}
else {
WriteBuffer[0] = (u8) (Address >> 8);
WriteBuffer[1] = (u8) (Address);
}
Status = EepromWriteData(sizeof(Address));
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/*
* Disbale repeated start option.
* This call will give an indication to the driver.
* The hold bit is actually reset when the following transfer ends.
*/
XIicPs_ClearOptions(&IicInstance, XIICPS_REP_START_OPTION);
/*
* Receive the Data.
*/
Status = XIicPs_MasterRecvPolled(&IicInstance, BufferPtr,
ByteCount, IIC_SLAVE_ADDR);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/*
* Wait until bus is idle to start another transfer.
*/
while (XIicPs_BusIsBusy(&IicInstance));
return XST_SUCCESS;
}
/*****************************************************************************/
/**
* This function initializes the IIC MUX to select EEPROM.
*
* @param None.
*
* @return XST_SUCCESS if pass, otherwise XST_FAILURE.
*
* @note None.
*
****************************************************************************/
int MuxInit(void)
{
u8 WriteBuffer;
u8 MuxIicAddr = IIC_MUX_ADDRESS;
u8 Buffer = 0;
int Status = 0;
/*
* Channel select value for EEPROM.
*/
WriteBuffer = 0x04;
/*
* Send the Data.
*/
Status = XIicPs_MasterSendPolled(&IicInstance, &WriteBuffer,1,
MuxIicAddr);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/*
* Wait until bus is idle to start another transfer.
*/
while (XIicPs_BusIsBusy(&IicInstance));
/*
* Receive the Data.
*/
Status = XIicPs_MasterRecvPolled(&IicInstance, &Buffer,1, MuxIicAddr);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/*
* Wait until bus is idle to start another transfer.
*/
while (XIicPs_BusIsBusy(&IicInstance));
return XST_SUCCESS;
}