1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
|
/*
FreeRTOS V8.0.1 - Copyright (C) 2014 Real Time Engineers Ltd.
All rights reserved
VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
***************************************************************************
* *
* FreeRTOS provides completely free yet professionally developed, *
* robust, strictly quality controlled, supported, and cross *
* platform software that has become a de facto standard. *
* *
* Help yourself get started quickly and support the FreeRTOS *
* project by purchasing a FreeRTOS tutorial book, reference *
* manual, or both from: http://www.FreeRTOS.org/Documentation *
* *
* Thank you! *
* *
***************************************************************************
This file is part of the FreeRTOS distribution.
FreeRTOS is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License (version 2) as published by the
Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
>>! NOTE: The modification to the GPL is included to allow you to !<<
>>! distribute a combined work that includes FreeRTOS without being !<<
>>! obliged to provide the source code for proprietary components !<<
>>! outside of the FreeRTOS kernel. !<<
FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. Full license text is available from the following
link: http://www.freertos.org/a00114.html
1 tab == 4 spaces!
***************************************************************************
* *
* Having a problem? Start by reading the FAQ "My application does *
* not run, what could be wrong?" *
* *
* http://www.FreeRTOS.org/FAQHelp.html *
* *
***************************************************************************
http://www.FreeRTOS.org - Documentation, books, training, latest versions,
license and Real Time Engineers Ltd. contact details.
http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
including FreeRTOS+Trace - an indispensable productivity tool, a DOS
compatible FAT file system, and our tiny thread aware UDP/IP stack.
http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
licenses offer ticketed support, indemnification and middleware.
http://www.SafeRTOS.com - High Integrity Systems also provide a safety
engineered and independently SIL3 certified version for use in safety and
mission critical applications that require provable dependability.
1 tab == 4 spaces!
*/
/* Hardware specific includes. */
#include <tc1782.h>
#include <machine/intrinsics.h>
#include <machine/cint.h>
#include <machine/wdtcon.h>
/* Scheduler Includes. */
#include "FreeRTOS.h"
#include "task.h"
#include "queue.h"
/* Demo Includes. */
#include "serial.h"
/*****************************************************************************
* Please note!
*
* This file is here to provide a means of generating interrupts to test the
* FreeRTOS tricore port. First - it configures the UART into loopback mode,
* and has only been used in loopback mode. Therefore, the baud rate
* calculation used has never been verified for correctness. Second -
* characters are passed into and out of the interrupt service routines using
* character queues. This provides a good test of the interrupt interaction,
* context switching mechanism, and kernel loading, it is however highly
* inefficient if the UART is being used to handle even moderate amounts of
* data throughput.
*/
/*---------------------------------------------------------------------------*/
/*
* See if the Serial Transmit Interrupt is currently activated, meaning that
* the interrupt is working through the back log of bytes that it needs to
* send. If the ISR is not enabled, then it will be triggered to send the first
* byte, and it will be automatically re-triggered when that byte has been
* sent. When the queue is exhausted, the ISR disables itself.
*/
static void prvCheckTransmit( void );
/*
* The transmit and receive interrupt handlers.
*/
static void prvTxBufferInterruptHandler( int iArg ) __attribute__( ( longcall ) );
static void prvRxInterruptHandler( int iArg )__attribute__( ( longcall ) );
/*-----------------------------------------------------------*/
/* Queues used to pass bytes into and out of the interrupt handlers.
NOTE: This is not intended to be an example of an efficient interrupt handler,
but instead to load the kernel and interrupt mechanisms in order to test the
FreeRTOS port. Using a FIFO, DMA, circular buffer, etc. architecture will
to improve efficiency. */
static QueueHandle_t xSerialTransmitQueue = NULL;
static QueueHandle_t xSerialReceiveQueue = NULL;
static volatile portBASE_TYPE xTransmitStatus = 0UL;
/*-----------------------------------------------------------*/
xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
{
unsigned long ulReloadValue = 0UL;
ulReloadValue = ( configPERIPHERAL_CLOCK_HZ / ( 48UL * ulWantedBaud ) ) - 1UL;
if( NULL == xSerialTransmitQueue )
{
xSerialTransmitQueue = xQueueCreate( uxQueueLength, sizeof( char ) );
xSerialReceiveQueue = xQueueCreate( uxQueueLength, sizeof( char ) );
}
/* Enable ASC0 Module. */
unlock_wdtcon();
{
while ( 0 != ( WDT_CON0.reg & 0x1UL ) );
ASC0_CLC.reg = 0x0200UL;
}
lock_wdtcon();
/* Disable the Operation. */
ASC0_CON.reg &= 0xFFFF7FFF;
/* Set-up the GPIO Ports. */
P3_IOCR0.reg = 0x00009000; /* 3.0 ASC In, 3.1 Alt ASC Out */
/* Write the baud rate. */
ASC0_BG.reg = ulReloadValue;
/* Reconfigure and re-initialise the Operation. */
ASC0_PISEL.reg = 0UL;
ASC0_CON.reg = 0UL;
ASC0_CON.bits.M = 0x01; /* 8bit async. */
ASC0_CON.bits.REN = 0x01; /* Receiver enabled. */
ASC0_CON.bits.FDE = 0x01; /* Fractional divider enabled. */
ASC0_CON.bits.BRS = 0x01; /* Divide by three. */
ASC0_CON.bits.LB = 0x01; /* Loopback enabled. */
ASC0_CON.bits.R = 0x01; /* Enable the baud rate generator. */
/* Install the Tx interrupt. */
if( 0 != _install_int_handler( configINTERRUPT_PRIORITY_TX, prvTxBufferInterruptHandler, 0 ) )
{
ASC0_TBSRC.reg = configINTERRUPT_PRIORITY_TX | 0x5000UL;
xTransmitStatus = 0UL;
}
/* Install the Rx interrupt. */
if( 0 != _install_int_handler( configINTERRUPT_PRIORITY_RX, prvRxInterruptHandler, 0 ) )
{
ASC0_RSRC.reg = configINTERRUPT_PRIORITY_RX | 0x5000UL;
}
/* COM Handle is never used by demo code. */
return (xComPortHandle) pdPASS;
}
/*---------------------------------------------------------------------------*/
void vSerialPutString( xComPortHandle pxPort, const signed char * const pcString, unsigned short usStringLength )
{
unsigned short usChar;
for( usChar = 0; usChar < usStringLength; usChar++ )
{
xSerialPutChar( pxPort, pcString[ usChar ], portMAX_DELAY );
}
}
/*---------------------------------------------------------------------------*/
signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, TickType_t xBlockTime )
{
/* Just to remove compiler warnings about unused parameters. */
( void )pxPort;
return xQueueReceive( xSerialReceiveQueue, pcRxedChar, xBlockTime );
}
/*---------------------------------------------------------------------------*/
signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, TickType_t xBlockTime )
{
portBASE_TYPE xReturn = pdPASS;
/* Just to remove compiler warnings about unused parameters. */
( void )pxPort;
/* Send the character to the interrupt handler. */
xReturn = xQueueSend( xSerialTransmitQueue, &cOutChar, xBlockTime );
/* Start the transmission of bytes if necessary. */
prvCheckTransmit();
return xReturn;
}
/*---------------------------------------------------------------------------*/
static void prvTxBufferInterruptHandler( int iArg )
{
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
unsigned char ucTx;
/* Just to remove compiler warnings about unused parameters. */
( void ) iArg;
/* ACK. */
ASC0_TBSRC.reg |= 0x4000UL;
xTransmitStatus = 1UL;
/* TBUF Can be refilled. */
if( pdPASS == xQueueReceiveFromISR( xSerialTransmitQueue, &ucTx, &xHigherPriorityTaskWoken ) )
{
ASC0_TBUF.reg = ucTx;
}
else
{
/* Failed to get a character out of the Queue. No longer busy. */
xTransmitStatus = 0UL;
}
/* Finally end ISR and switch Task if necessary. */
portYIELD_FROM_ISR( xHigherPriorityTaskWoken );
}
/*---------------------------------------------------------------------------*/
static void prvRxInterruptHandler( int iArg )
{
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
unsigned char ucRx;
/* Just to remove compiler warnings about unused parameters. */
( void ) iArg;
/* Grab the character as early as possible. */
ucRx = ( unsigned char ) ASC0_RBUF.reg;
/* ACK. */
ASC0_RSRC.reg |= 0x4000UL;
/* Frame available in RBUF. */
if( pdPASS != xQueueSendFromISR( xSerialReceiveQueue, &ucRx, &xHigherPriorityTaskWoken ) )
{
/* Error handling code can go here. */
}
/* Finally end ISR and switch Task if necessary. */
portYIELD_FROM_ISR( xHigherPriorityTaskWoken );
}
/*---------------------------------------------------------------------------*/
void prvCheckTransmit( void )
{
/* Check to see if the interrupt handler is working its way through the
buffer. */
if( 0 == xTransmitStatus )
{
/* Not currently operational so kick off the first byte. */
ASC0_TBSRC.reg |= 0x8000UL;
}
}
/*---------------------------------------------------------------------------*/
|
