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/******************************************************************************
*
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******************************************************************************/
/*****************************************************************************/
/**
*
* @file xiicps.c
* @addtogroup iicps_v3_5
* @{
*
* Contains implementation of required functions for the XIicPs driver.
* See xiicps.h for detailed description of the device and driver.
*
* <pre> MODIFICATION HISTORY:
*
* Ver Who Date Changes
* ----- ------ -------- --------------------------------------------
* 1.00a drg/jz 01/30/10 First release
* 1.00a sdm 09/21/11 Updated the InstancePtr->Options in the
* XIicPs_CfgInitialize by calling XIicPs_GetOptions.
* 2.1 hk 04/25/14 Explicitly reset CR and clear FIFO in Abort function
* and state the same in the comments. CR# 784254.
* Fix for CR# 761060 - provision for repeated start.
* 2.3 sk 10/07/14 Repeated start feature removed.
* 3.0 sk 11/03/14 Modified TimeOut Register value to 0xFF
* in XIicPs_Reset.
* 12/06/14 Implemented Repeated start feature.
* 01/31/15 Modified the code according to MISRAC 2012 Compliant.
* 3.3 kvn 05/05/16 Modified latest code for MISRA-C:2012 Compliance.
*
* </pre>
*
******************************************************************************/
/***************************** Include Files *********************************/
#include "xiicps.h"
/************************** Constant Definitions *****************************/
/**************************** Type Definitions *******************************/
/***************** Macros (Inline Functions) Definitions *********************/
/************************** Function Prototypes ******************************/
static void StubHandler(void *CallBackRef, u32 StatusEvent);
/************************** Variable Definitions *****************************/
/*****************************************************************************/
/**
*
* Initializes a specific XIicPs instance such that the driver is ready to use.
*
* The state of the device after initialization is:
* - Device is disabled
* - Slave mode
*
* @param InstancePtr is a pointer to the XIicPs instance.
* @param ConfigPtr is a reference to a structure containing information
* about a specific IIC device. This function initializes an
* InstancePtr object for a specific device specified by the
* contents of Config.
* @param EffectiveAddr is the device base address in the virtual memory
* address space. The caller is responsible for keeping the address
* mapping from EffectiveAddr to the device physical base address
* unchanged once this function is invoked. Unexpected errors may
* occur if the address mapping changes after this function is
* called. If address translation is not used, use
* ConfigPtr->BaseAddress for this parameter, passing the physical
* address instead.
*
* @return The return value is XST_SUCCESS if successful.
*
* @note None.
*
******************************************************************************/
s32 XIicPs_CfgInitialize(XIicPs *InstancePtr, XIicPs_Config *ConfigPtr,
u32 EffectiveAddr)
{
/*
* Assert validates the input arguments.
*/
Xil_AssertNonvoid(InstancePtr != NULL);
Xil_AssertNonvoid(ConfigPtr != NULL);
/*
* Set some default values.
*/
InstancePtr->Config.DeviceId = ConfigPtr->DeviceId;
InstancePtr->Config.BaseAddress = EffectiveAddr;
InstancePtr->Config.InputClockHz = ConfigPtr->InputClockHz;
InstancePtr->StatusHandler = StubHandler;
InstancePtr->CallBackRef = NULL;
InstancePtr->IsReady = (u32)XIL_COMPONENT_IS_READY;
/*
* Reset the IIC device to get it into its initial state. It is expected
* that device configuration will take place after this initialization
* is done, but before the device is started.
*/
XIicPs_Reset(InstancePtr);
/*
* Keep a copy of what options this instance has.
*/
InstancePtr->Options = XIicPs_GetOptions(InstancePtr);
/* Initialize repeated start flag to 0 */
InstancePtr->IsRepeatedStart = 0;
return (s32)XST_SUCCESS;
}
/*****************************************************************************/
/**
* Check whether the I2C bus is busy
*
* @param InstancePtr is a pointer to the XIicPs instance.
*
* @return
* - TRUE if the bus is busy.
* - FALSE if the bus is not busy.
*
* @note None.
*
******************************************************************************/
s32 XIicPs_BusIsBusy(XIicPs *InstancePtr)
{
u32 StatusReg;
s32 Status;
StatusReg = XIicPs_ReadReg(InstancePtr->Config.BaseAddress,
XIICPS_SR_OFFSET);
if ((StatusReg & XIICPS_SR_BA_MASK) != 0x0U) {
Status = (s32)TRUE;
}else {
Status = (s32)FALSE;
}
return Status;
}
/*****************************************************************************/
/**
*
* This is a stub for the status callback. The stub is here in case the upper
* layers forget to set the handler.
*
* @param CallBackRef is a pointer to the upper layer callback reference.
* @param StatusEvent is the event that just occurred.
* @param ByteCount is the number of bytes transferred up until the event
* occurred.
*
* @return None.
*
* @note None.
*
******************************************************************************/
static void StubHandler(void *CallBackRef, u32 StatusEvent)
{
(void) ((void *)CallBackRef);
(void) StatusEvent;
Xil_AssertVoidAlways();
}
/*****************************************************************************/
/**
*
* Aborts a transfer in progress by resetting the FIFOs. The byte counts are
* cleared.
*
* @param InstancePtr is a pointer to the XIicPs instance.
*
* @return None.
*
* @note None.
*
******************************************************************************/
void XIicPs_Abort(XIicPs *InstancePtr)
{
u32 IntrMaskReg;
u32 IntrStatusReg;
Xil_AssertVoid(InstancePtr != NULL);
Xil_AssertVoid(InstancePtr->IsReady == (u32)XIL_COMPONENT_IS_READY);
/*
* Enter a critical section, so disable the interrupts while we clear
* the FIFO and the status register.
*/
IntrMaskReg = XIicPs_ReadReg(InstancePtr->Config.BaseAddress,
XIICPS_IMR_OFFSET);
XIicPs_WriteReg(InstancePtr->Config.BaseAddress,
XIICPS_IDR_OFFSET, XIICPS_IXR_ALL_INTR_MASK);
/*
* Reset the settings in config register and clear the FIFOs.
*/
XIicPs_WriteReg(InstancePtr->Config.BaseAddress, XIICPS_CR_OFFSET,
(u32)XIICPS_CR_RESET_VALUE | (u32)XIICPS_CR_CLR_FIFO_MASK);
/*
* Read, then write the interrupt status to make sure there are no
* pending interrupts.
*/
IntrStatusReg = XIicPs_ReadReg(InstancePtr->Config.BaseAddress,
XIICPS_ISR_OFFSET);
XIicPs_WriteReg(InstancePtr->Config.BaseAddress,
XIICPS_ISR_OFFSET, IntrStatusReg);
/*
* Restore the interrupt state.
*/
IntrMaskReg = (u32)XIICPS_IXR_ALL_INTR_MASK & (~IntrMaskReg);
XIicPs_WriteReg(InstancePtr->Config.BaseAddress,
XIICPS_IER_OFFSET, IntrMaskReg);
}
/*****************************************************************************/
/**
*
* Resets the IIC device. Reset must only be called after the driver has been
* initialized. The configuration of the device after reset is the same as its
* configuration after initialization. Any data transfer that is in progress is
* aborted.
*
* The upper layer software is responsible for re-configuring (if necessary)
* and reenabling interrupts for the IIC device after the reset.
*
* @param InstancePtr is a pointer to the XIicPs instance.
*
* @return None.
*
* @note None.
*
******************************************************************************/
void XIicPs_Reset(XIicPs *InstancePtr)
{
Xil_AssertVoid(InstancePtr != NULL);
Xil_AssertVoid(InstancePtr->IsReady == (u32)XIL_COMPONENT_IS_READY);
/*
* Abort any transfer that is in progress.
*/
XIicPs_Abort(InstancePtr);
/*
* Reset any values so the software state matches the hardware device.
*/
XIicPs_WriteReg(InstancePtr->Config.BaseAddress, XIICPS_CR_OFFSET,
XIICPS_CR_RESET_VALUE);
XIicPs_WriteReg(InstancePtr->Config.BaseAddress,
XIICPS_TIME_OUT_OFFSET, XIICPS_TO_RESET_VALUE);
XIicPs_WriteReg(InstancePtr->Config.BaseAddress, XIICPS_IDR_OFFSET,
XIICPS_IXR_ALL_INTR_MASK);
}
/*****************************************************************************/
/**
* Put more data into the transmit FIFO, number of bytes is ether expected
* number of bytes for this transfer or available space in FIFO, which ever
* is less.
*
* @param InstancePtr is a pointer to the XIicPs instance.
*
* @return Number of bytes left for this instance.
*
* @note This is function is shared by master and slave.
*
******************************************************************************/
s32 TransmitFifoFill(XIicPs *InstancePtr)
{
u8 AvailBytes;
s32 LoopCnt;
s32 NumBytesToSend;
/*
* Determine number of bytes to write to FIFO.
*/
AvailBytes = (u8)XIICPS_FIFO_DEPTH -
(u8)XIicPs_ReadReg(InstancePtr->Config.BaseAddress,
XIICPS_TRANS_SIZE_OFFSET);
if (InstancePtr->SendByteCount > (s32)AvailBytes) {
NumBytesToSend = (s32)AvailBytes;
} else {
NumBytesToSend = InstancePtr->SendByteCount;
}
/*
* Fill FIFO with amount determined above.
*/
for (LoopCnt = 0; LoopCnt < NumBytesToSend; LoopCnt++) {
XIicPs_SendByte(InstancePtr);
}
return InstancePtr->SendByteCount;
}
/** @} */