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
|
/*
* FreeRTOS Kernel V10.4.0
* Copyright (C) 2020 Amazon.com, Inc. or its affiliates. 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.
*
* 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 AUTHORS OR
* COPYRIGHT HOLDERS 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.
*
* http://www.FreeRTOS.org
* http://aws.amazon.com/freertos
*
* 1 tab == 4 spaces!
*/
#include <device.h>
#include "FreeRTOS.h"
#include "queue.h"
#include "task.h"
#include "serial.h"
/*---------------------------------------------------------------------------*/
#define serialSTRING_DELAY_TICKS ( portMAX_DELAY )
/*---------------------------------------------------------------------------*/
CY_ISR_PROTO( vUartRxISR );
CY_ISR_PROTO( vUartTxISR );
/*---------------------------------------------------------------------------*/
static QueueHandle_t xSerialTxQueue = NULL;
static QueueHandle_t xSerialRxQueue = NULL;
/*---------------------------------------------------------------------------*/
xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
{
/* Configure Rx. */
xSerialRxQueue = xQueueCreate( uxQueueLength, sizeof( signed char ) );
isr_UART1_RX_BYTE_RECEIVED_ClearPending();
isr_UART1_RX_BYTE_RECEIVED_StartEx(vUartRxISR);
/* Configure Tx */
xSerialTxQueue = xQueueCreate( uxQueueLength, sizeof( signed char ) );
isr_UART1_TX_BYTE_COMPLETE_ClearPending() ;
isr_UART1_TX_BYTE_COMPLETE_StartEx(vUartTxISR);
/* Clear the interrupt modes for the Tx for the time being. */
UART_1_SetTxInterruptMode( 0 );
/* Both configured successfully. */
return ( xComPortHandle )( xSerialTxQueue && xSerialRxQueue );
}
/*---------------------------------------------------------------------------*/
void vSerialPutString( xComPortHandle pxPort, const signed char * const pcString, unsigned short usStringLength )
{
unsigned short usIndex = 0;
for( usIndex = 0; usIndex < usStringLength; usIndex++ )
{
/* Check for pre-mature end of line. */
if( '\0' == pcString[ usIndex ] )
{
break;
}
/* Send out, one character at a time. */
if( pdTRUE != xSerialPutChar( NULL, pcString[ usIndex ], serialSTRING_DELAY_TICKS ) )
{
/* Failed to send, this will be picked up in the receive comtest task. */
}
}
}
/*---------------------------------------------------------------------------*/
signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, TickType_t xBlockTime )
{
portBASE_TYPE xReturn = pdFALSE;
if( pdTRUE == xQueueReceive( xSerialRxQueue, pcRxedChar, xBlockTime ) )
{
/* Picked up a character. */
xReturn = pdTRUE;
}
return xReturn;
}
/*---------------------------------------------------------------------------*/
signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, TickType_t xBlockTime )
{
portBASE_TYPE xReturn = pdFALSE;
/* The ISR is processing characters is so just add to the end of the queue. */
if( pdTRUE == xQueueSend( xSerialTxQueue, &cOutChar, xBlockTime ) )
{
xReturn = pdTRUE;
}
else
{
/* The queue is probably full. */
xReturn = pdFALSE;
}
/* Make sure that the interrupt will fire in the case where:
Currently sending so the Tx Complete will fire.
Not sending so the Empty will fire. */
taskENTER_CRITICAL();
UART_1_SetTxInterruptMode( UART_1_TX_STS_COMPLETE | UART_1_TX_STS_FIFO_EMPTY );
taskEXIT_CRITICAL();
return xReturn;
}
/*---------------------------------------------------------------------------*/
CY_ISR(vUartRxISR)
{
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
volatile unsigned char ucStatus = 0;
signed char cInChar = 0;
unsigned long ulMask = 0;
/* Read the status to acknowledge. */
ucStatus = UART_1_ReadRxStatus();
/* Only interested in a character being received. */
if( 0 != ( ucStatus & UART_1_RX_STS_FIFO_NOTEMPTY ) )
{
/* Get the character. */
cInChar = UART_1_GetChar();
/* Mask off the other RTOS interrupts to interact with the queue. */
ulMask = portSET_INTERRUPT_MASK_FROM_ISR();
{
/* Try to deliver the character. */
if( pdTRUE != xQueueSendFromISR( xSerialRxQueue, &cInChar, &xHigherPriorityTaskWoken ) )
{
/* Run out of space. */
}
}
portCLEAR_INTERRUPT_MASK_FROM_ISR( ulMask );
}
/* If we delivered the character then a context switch might be required.
xHigherPriorityTaskWoken was set to pdFALSE on interrupt entry. If calling
xQueueSendFromISR() caused a task to unblock, and the unblocked task has
a priority equal to or higher than the currently running task (the task this
ISR interrupted), then xHigherPriorityTaskWoken will have been set to pdTRUE and
portEND_SWITCHING_ISR() will request a context switch to the newly unblocked
task. */
portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
}
/*---------------------------------------------------------------------------*/
CY_ISR(vUartTxISR)
{
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
volatile unsigned char ucStatus = 0;
signed char cOutChar = 0;
unsigned long ulMask = 0;
/* Read the status to acknowledge. */
ucStatus = UART_1_ReadTxStatus();
/* Check to see whether this is a genuine interrupt. */
if( ( 0 != ( ucStatus & UART_1_TX_STS_COMPLETE ) ) || ( 0 != ( ucStatus & UART_1_TX_STS_FIFO_EMPTY ) ) )
{
/* Mask off the other RTOS interrupts to interact with the queue. */
ulMask = portSET_INTERRUPT_MASK_FROM_ISR();
{
if( pdTRUE == xQueueReceiveFromISR( xSerialTxQueue, &cOutChar, &xHigherPriorityTaskWoken ) )
{
/* Send the next character. */
UART_1_PutChar( cOutChar );
/* If we are firing, then the only interrupt we are interested in
is the Complete. The application code will add the Empty interrupt
when there is something else to be done. */
UART_1_SetTxInterruptMode( UART_1_TX_STS_COMPLETE );
}
else
{
/* There is no work left so disable the interrupt until the application
puts more into the queue. */
UART_1_SetTxInterruptMode( 0 );
}
}
portCLEAR_INTERRUPT_MASK_FROM_ISR( ulMask );
}
/* If we delivered the character then a context switch might be required.
xHigherPriorityTaskWoken was set to pdFALSE on interrupt entry. If calling
xQueueSendFromISR() caused a task to unblock, and the unblocked task has
a priority equal to or higher than the currently running task (the task this
ISR interrupted), then xHigherPriorityTaskWoken will have been set to pdTRUE and
portEND_SWITCHING_ISR() will request a context switch to the newly unblocked
task. */
portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
}
/*---------------------------------------------------------------------------*/
|
