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Macros | |
| #define | _DEFAULT_SOURCE |
| #define | IIC_TIMEOUT 5 |
Functions | |
| unsigned | XIic_Recv (UINTPTR BaseAddress, u8 Address, u8 *BufferPtr, unsigned ByteCount, u8 Option) |
| unsigned | XIic_Send (UINTPTR BaseAddress, u8 Address, u8 *BufferPtr, unsigned ByteCount, u8 Option) |
| u32 | XIic_CheckIsBusBusy (UINTPTR BaseAddress) |
| u32 | XIic_WaitBusFree (UINTPTR BaseAddress) |
Macro Definition Documentation
◆ _DEFAULT_SOURCE
| #define _DEFAULT_SOURCE |
This file contains low-level driver functions that can be used to access the device in normal and dynamic controller mode. The user should refer to the hardware device specification for more details of the device operation.
MODIFICATION HISTORY:
Ver Who Date Changes
----- --- ------- -----------------------------------------------
1.01b jhl 05/13/02 First release
1.01b jhl 10/14/02 Corrected bug in the receive function, the setup of the
interrupt status mask was not being done in the loop such
that a read would sometimes fail on the last byte because
the transmit error which should have been ignored was
being used. This would leave an extra byte in the FIFO
and the bus throttled such that the next operation would
also fail. Also updated the receive function to not
disable the device after the last byte until after the
bus transitions to not busy which is more consistent
with the expected behavior.
1.01c ecm 12/05/02 new rev
1.02a mta 03/09/06 Implemented Repeated Start in the Low Level Driver.
1.03a mta 04/04/06 Implemented Dynamic IIC core routines.
1.03a ecm 06/15/06 Fixed the hang in low_level_eeprom_test with -O0
Added polling loops for BNB to allow the slave to
respond correctly. Also added polling loop prior
to reset in _Recv.
1.13a wgr 03/22/07 Converted to new coding style.
1.13b ecm 11/29/07 added BB polling loops to the DynSend and DynRecv
routines to handle the race condition with BNB in IISR.
2.00a sdm 10/22/09 Converted all register accesses to 32 bit access.
Updated to use the HAL APIs/macros.
Some of the macros have been renamed to remove _m from
the name and Some of the macros have been renamed to be
consistent, see the xiic_i.h and xiic_l.h files for
further information.
2.02a sdm 10/08/10 Updated to disable the device at the end of the transfer,
only when addressed as slave in XIic_Send for CR565373.
2.04a sdm 07/22/11 Removed a compiler warning by adding parenthesis around &
at line 479.
2.08a adk 29/07/13 In Low level driver In repeated start condition the
Direction of Tx bit must be disabled in Receive
condition It Fixes the CR:685759 Changes are done
in the function XIic_Recv.
3.2 sk 11/10/15 Used UINTPTR instead of u32 for Baseaddress CR# 867425.
Changed the prototypes of RecvData, SendData,
DynRecvData, DynSendData APIs.
3.2 sd 18/02/16 In Low level driver in repeated start condition
NACK for last byte is added. Changes are done in
XIic_Recv for CR# 862303
3.3 sk 06/17/16 Added bus busy checks for slave send/recv and master
send/recv.
3.3 als 06/27/16 Added Low-level XIic_CheckIsBusBusy API.
3.3 als 06/27/16 Added low-level XIic_WaitBusFree API.
3.4 nk 16/11/16 Reduced sleeping time in Bus-busy check.
3.5 sd 08/29/18 Fix bus busy check for the NACK case.
◆ IIC_TIMEOUT
Function Documentation
◆ XIic_CheckIsBusBusy()
| u32 XIic_CheckIsBusBusy | ( | UINTPTR | BaseAddress | ) |
◆ XIic_Recv()
| unsigned XIic_Recv | ( | UINTPTR | BaseAddress, |
| u8 | Address, | ||
| u8 * | BufferPtr, | ||
| unsigned | ByteCount, | ||
| u8 | Option | ||
| ) |
Receive data as a master on the IIC bus. This function receives the data using polled I/O and blocks until the data has been received. It only supports 7 bit addressing mode of operation. This function returns zero if bus is busy.
- Parameters
-
BaseAddress contains the base address of the IIC device. Address contains the 7 bit IIC address of the device to send the specified data to. BufferPtr points to the data to be sent. ByteCount is the number of bytes to be sent. Option indicates whether to hold or free the bus after reception of data, XIIC_STOP = end with STOP condition, XIIC_REPEATED_START = don't end with STOP condition.
- Returns
- The number of bytes received.
- Note
- None.
Definition at line 117 of file xiic_l.c.
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◆ XIic_Send()
| unsigned XIic_Send | ( | UINTPTR | BaseAddress, |
| u8 | Address, | ||
| u8 * | BufferPtr, | ||
| unsigned | ByteCount, | ||
| u8 | Option | ||
| ) |
Send data as a master on the IIC bus. This function sends the data using polled I/O and blocks until the data has been sent. It only supports 7 bit addressing mode of operation. This function returns zero if bus is busy.
- Parameters
-
BaseAddress contains the base address of the IIC device. Address contains the 7 bit IIC address of the device to send the specified data to. BufferPtr points to the data to be sent. ByteCount is the number of bytes to be sent. Option indicates whether to hold or free the bus after transmitting the data.
- Returns
- The number of bytes sent.
- Note
- None.
Definition at line 373 of file xiic_l.c.
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◆ XIic_WaitBusFree()
| u32 XIic_WaitBusFree | ( | UINTPTR | BaseAddress | ) |
This function will wait until the I2C bus is free or timeout.
- Parameters
-
BaseAddress contains the base address of the I2C device.
- Returns
- XST_SUCCESS if the I2C bus was freed before the timeout.
- XST_FAILURE otherwise.
- Note
- None.
Definition at line 638 of file xiic_l.c.
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