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//###########################################################################
//
// FILE: F2837xD_Ipc.c
//
// TITLE: Inter-Processor Communication module support functions
//
//###########################################################################
// $TI Release: F2837xD Support Library v3.05.00.00 $
// $Release Date: Tue Jun 26 03:15:23 CDT 2018 $
// $Copyright:
// Copyright (C) 2013-2018 Texas Instruments Incorporated - http://www.ti.com/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the
// distribution.
//
// Neither the name of Texas Instruments Incorporated nor the names of
// its contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// $
//###########################################################################
//
// Included Files
//
#include "F2837xD_device.h"
#include "F2837xD_Examples.h"
#include <string.h>
//
// InitIpc - Initialize all IPC registers and clear all flags
//
void InitIpc()
{
//
//Clear sent flags. Received flags must not be cleared locally
//to handle the case where the remote CPU starts executing first.
//In this case, a remote flag could be sent correctly and be
//incorrectly cleared by this function. Unfortunately, we're
//still left with a startup synchronization problem if the
//remote CPU has flags left over from a previous run. There's
//probably a better way of handling this.
//
IpcRegs.IPCCLR.all = 0xFFFFFFFF;
//
//Clear commands
//
IpcRegs.IPCSENDCOM = 0;
IpcRegs.IPCSENDADDR = 0;
IpcRegs.IPCSENDDATA = 0;
IpcRegs.IPCLOCALREPLY = 0;
//
//Clear boot status and pump semaphore
//
#if defined(CPU1)
IpcRegs.IPCBOOTMODE = 0;
#elif defined(CPU2)
IpcRegs.IPCBOOTSTS = 0;
#endif
ReleaseFlashPump();
}
//
// ReadIpcTimer - Read the current IPC timer value. The low register must be
// read first to latch a value in the high register.
//
unsigned long long ReadIpcTimer()
{
Uint32 low, high;
low = IpcRegs.IPCCOUNTERL;
high = IpcRegs.IPCCOUNTERH;
return ((unsigned long long)high << 32) | (unsigned long long)low;
}
//
// SendIpcData - Copy data into the IPC send message RAM for this CPU and set
// a flag. If the specified 16-bit word length is greater than
// the size of the message RAM, the data is truncated.
//
void SendIpcData(void *data, Uint16 word_length, Uint16 flag)
{
word_length = (word_length < MSG_RAM_SIZE) ? word_length : MSG_RAM_SIZE;
memcpy(SEND_MSG_RAM, data, word_length);
if (flag != NO_IPC_FLAG)
{
SendIpcFlag(flag);
}
}
//
// RecvIpcData - Copy data out of the IPC receive message RAM for this CPU. If
// the specified 16-bit word length is greater than the size of
// the message RAM, the data is truncated.
//
void RecvIpcData(void *recv_buf, Uint16 word_length)
{
word_length = (word_length < MSG_RAM_SIZE) ? word_length : MSG_RAM_SIZE;
memcpy(recv_buf, RECV_MSG_RAM, word_length);
}
//
// FillIpcSendData - Fill the IPC send message RAM for this CPU with a constant
// value
//
void FillIpcSendData(Uint16 fill_data)
{
memset(SEND_MSG_RAM, fill_data, MSG_RAM_SIZE);
}
//
// SendIpcCommand - Write the send command, address, and data registers with
// the specified values, then set an IPC flag.
//
void SendIpcCommand(Uint32 command, Uint32 address, Uint32 data, Uint16 flag)
{
IpcRegs.IPCSENDCOM = command;
IpcRegs.IPCSENDADDR = address;
IpcRegs.IPCSENDDATA = data;
if (flag != NO_IPC_FLAG)
{
SendIpcFlag(flag);
}
}
//
// SendIpcFlag - Set an IPC flag bit for the other CPU. Flags 0-3 will generate
// PIE interrupts.
//
void SendIpcFlag(Uint16 flag)
{
IpcRegs.IPCSET.all = 1UL << flag;
}
//
// AckIpcFlag - Acknowledge/clear a received IPC flag
//
void AckIpcFlag(Uint16 flag)
{
IpcRegs.IPCACK.all = 1UL << flag;
}
//
// CancelIpcFlag - Clear a sent IPC flag bit before the other CPU acknowledges
// it. You will normally never use this function. To clear a
// received flag, call AckIpcFlag() instead.
//
void CancelIpcFlag(Uint16 flag)
{
IpcRegs.IPCCLR.all = 1UL << flag;
}
//
// WaitForIpcFlag - Wait for any IPC flag in the specified mask to be set.
// WARNING: If you use this function to wait for an IPC
// interrupt, you must not clear the IPC flag in the interrupt
// handler. Otherwise, this function will never return.
//
void WaitForIpcFlag(Uint16 flag)
{
//
//WARNING: Don't use this function to wait for an IPC interrupt!
//
while ((IpcRegs.IPCSTS.all & (1UL << flag)) == 0x00000000) {;}
}
//
// WaitForIpcAck - Wait for any IPC flag in the specified mask to be
// acknowledged.
//
void WaitForIpcAck(Uint16 flag)
{
while ((IpcRegs.IPCFLG.all & (1UL << flag)) != 0x00000000) {;}
}
//
// IpcSync - Synchronize the two CPUs. Neither CPU will return from this
// function call before the other one enters it. Must be called with
// the same flag number on both CPUs.
//
void IpcSync(Uint16 flag)
{
SendIpcFlag(flag);
WaitForIpcFlag(flag);
AckIpcFlag(flag);
WaitForIpcAck(flag);
}
//
// End of file
//
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