3 * Copyright (C) 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
5 * Permission is hereby granted, free of charge, to any person obtaining a copy of
6 * this software and associated documentation files (the "Software"), to deal in
7 * the Software without restriction, including without limitation the rights to
8 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
9 * the Software, and to permit persons to whom the Software is furnished to do so,
10 * subject to the following conditions:
12 * The above copyright notice and this permission notice shall be included in all
13 * copies or substantial portions of the Software.
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
17 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
18 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
19 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
20 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22 * http://www.FreeRTOS.org
23 * http://aws.amazon.com/freertos
28 /* Scheduler includes. */
34 /* Hardware specifics. */
38 /* States used by the LCD tasks. */
39 #define lcdRIGHT_TO_LEFT 0U
40 #define lcdLEFT_TO_RIGHT 1U
43 /* Characters on each line. */
44 #define lcdSTRING_LEN 8
46 /* Commands sent from the IRQ to the task controlling the second line of the
48 #define lcdSHIFT_BACK_COMMAND 0x01U
49 #define lcdSTART_STOP_COMMAND 0x02U
50 #define lcdSHIFT_FORWARD_COMMAND 0x03U
52 /* The length of the queue used to send commands from the ISRs. */
53 #define lcdCOMMAND_QUEUE_LENGTH 32U
55 /* Defines the minimum time that must pass between consecutive button presses
56 to accept a button press as a unique press rather than just a bounce. */
57 #define lcdMIN_TIME_BETWEEN_INTERRUPTS_MS ( 125UL / portTICK_PERIOD_MS )
59 /* Button interrupt handlers. */
60 #pragma interrupt ( prvIRQ1_Handler( vect = 65, enable ) )
61 static void prvIRQ1_Handler( void );
63 #pragma interrupt ( prvIRQ3_Handler( vect = 67, enable ) )
64 static void prvIRQ3_Handler( void );
66 #pragma interrupt ( prvIRQ4_Handler(vect = 68, enable ) )
67 static void prvIRQ4_Handler( void );
70 * Setup the IO needed for the buttons to generate interrupts.
72 static void prvSetupButtonIOAndInterrupts( void );
75 * A task that simply scrolls a string from left to right, then back from the
76 * right to the left. This is done on the first line of the display.
78 static void prvLCDTaskLine1( void *pvParameters );
81 * If no buttons are pushed, then this task acts as per prvLCDTaskLine1(), but
82 * using the second line of the display.
84 * Using the buttons, it is possible to start and stop the scrolling of the
85 * text. Once the scrolling has been stopped, other buttons can be used to
86 * manually scroll the text either left or right.
88 static void prvLCDTaskLine2( void *pvParameters );
91 * Looks at the direction the string is currently being scrolled in, and moves
92 * the index into the portion of the string that can be seen on the display
93 * either forward or backward as appropriate.
95 static prvScrollString( unsigned char *pucDirection, unsigned short *pusPosition, size_t xStringLength );
98 * Displays lcdSTRING_LEN characters starting from pcString on the line of the
99 * display requested by ucLine.
101 static void prvDisplayNextString( unsigned char ucLine, char *pcString );
104 * Called from the IRQ interrupts, which are generated on button pushes. Send
105 * ucCommand to the task on the button command queue if
106 * lcdMIN_TIME_BETWEEN_INTERRUPTS_MS milliseconds have passed since the button
107 * was last pushed (for debouncing).
109 static portBASE_TYPE prvSendCommandOnDebouncedInput( TickType_t *pxTimeLastInterrupt, unsigned char ucCommand );
111 /*-----------------------------------------------------------*/
113 /* The queue used to pass commands from the button interrupt handlers to the
114 prvLCDTaskLine2() task. */
115 static QueueHandle_t xButtonCommandQueue = NULL;
117 /* The mutex used to ensure only one task writes to the display at any one
119 static SemaphoreHandle_t xLCDMutex = NULL;
121 /* The string that is scrolled up and down the first line of the display. */
122 static const char cDataString1[] = " http://www.FreeRTOS.org ";
124 /* The string that is scrolled/nudged up and down the second line of the
126 static const char cDataString2[] = "........Rx210 Highlights....1.56 DMips/MHz....DSP functions....1.62V-5.5V operation....200 uA/MHz....Up to 512 kBytes Flash....up to 64 kbytes SRAM....EE Dataflash with 100k w/e....1.3 uA in Real Time Clock Mode....Powerful Motor control timer....4 x 16-bit timers....4 x 8-bit timers....Full Real Time Clock calendar with calibration and alarm functions....Up to 16 channels 1 uS 12-bit ADC, with Dual group programmable SCAN, 3 sample and holds, sample accumulate function....DMA controller....Data Transfer Controller....Up to 9 serial Channels....Up to 6 USARTs ( with Simple I2C / SPI )....USART ( with unique Frame based protocol support )....Multimaster IIC....RSPI....Temperature Sensor....Event Link Controller....Comparators....Safety features include CRC....March X....Dual watchdog Timers with window and independent oscillator....ADC self test....I/O Pin Test....Supported with E1 on chip debugger and RSK210 evaluation system....Rx210 Highlights........";
128 /* Structures passed into the two tasks to inform them which line to use on the
129 display, how long to delay for, and which string to use. */
130 struct _LCD_Params xLCDLine1 =
132 LCD_LINE1, 215, ( char * ) cDataString1
135 struct _LCD_Params xLCDLine2 =
137 LCD_LINE2, 350, ( char * ) cDataString2
141 /*-----------------------------------------------------------*/
143 void vStartButtonAndLCDDemo( void )
145 prvSetupButtonIOAndInterrupts();
148 /* Create the mutex used to guard the LCD. */
149 xLCDMutex = xSemaphoreCreateMutex();
150 configASSERT( xLCDMutex );
152 /* Create the queue used to pass commands from the IRQ interrupts to the
153 prvLCDTaskLine2() task. */
154 xButtonCommandQueue = xQueueCreate( lcdCOMMAND_QUEUE_LENGTH, sizeof( unsigned char ) );
155 configASSERT( xButtonCommandQueue );
157 /* Start the two tasks as described at the top of this file. */
158 xTaskCreate( prvLCDTaskLine1, "LCD1", configMINIMAL_STACK_SIZE * 3, ( void * ) &xLCDLine1, tskIDLE_PRIORITY + 1, NULL );
159 xTaskCreate( prvLCDTaskLine2, "LCD2", configMINIMAL_STACK_SIZE * 3, ( void * ) &xLCDLine2, tskIDLE_PRIORITY + 2, NULL );
161 /*-----------------------------------------------------------*/
163 static void prvLCDTaskLine1( void *pvParameters )
165 struct _LCD_Params *pxLCDParamaters = ( struct _LCD_Params * ) pvParameters;
166 unsigned short usPosition = 0U;
167 unsigned char ucDirection = lcdRIGHT_TO_LEFT;
171 vTaskDelay( pxLCDParamaters->Speed / portTICK_PERIOD_MS );
173 /* Write the string. */
174 prvDisplayNextString( pxLCDParamaters->Line, &( pxLCDParamaters->ptr_str[ usPosition ] ) );
176 /* Move the string in whichever direction the scroll is currently going
178 prvScrollString( &ucDirection, &usPosition, strlen( pxLCDParamaters->ptr_str ) );
181 /*-----------------------------------------------------------*/
183 static void prvLCDTaskLine2( void *pvParameters )
185 struct _LCD_Params *pxLCDParamaters = ( struct _LCD_Params * ) pvParameters;
186 unsigned short usPosition = 0U;
187 unsigned char ucDirection = lcdRIGHT_TO_LEFT, ucStatus = lcdRUNNING, ucQueueData;
188 TickType_t xDelayTicks = ( pxLCDParamaters->Speed / portTICK_PERIOD_MS );
192 /* Wait for a message from an IRQ handler. */
193 if( xQueueReceive( xButtonCommandQueue, &ucQueueData, xDelayTicks ) != pdPASS )
195 /* A message was not received before xDelayTicks ticks passed, so
196 generate the next string to display and display it. */
197 prvDisplayNextString( pxLCDParamaters->Line, &( pxLCDParamaters->ptr_str[ usPosition ] ) );
199 /* Move the string in whichever direction the scroll is currently
201 prvScrollString( &ucDirection, &usPosition, strlen( pxLCDParamaters->ptr_str ) );
205 /* A command was received. Process it. */
206 switch( ucQueueData )
208 case lcdSTART_STOP_COMMAND :
210 /* If the LCD is running, top it. If the LCD is stopped, start
212 ucStatus = !ucStatus;
214 if( ucStatus == lcdRUNNING )
216 xDelayTicks = ( pxLCDParamaters->Speed / portTICK_PERIOD_MS );
220 xDelayTicks = portMAX_DELAY;
225 case lcdSHIFT_BACK_COMMAND :
227 if( ucStatus != lcdRUNNING )
229 /* If not already at the start of the display.... */
230 if( usPosition != 0U )
232 /* ....move the display position back by one char. */
234 prvDisplayNextString( pxLCDParamaters->Line, &( pxLCDParamaters->ptr_str[ usPosition ] ) );
240 case lcdSHIFT_FORWARD_COMMAND :
242 if( ucStatus != lcdRUNNING )
244 /* If not already at the end of the display.... */
245 if( usPosition != ( strlen( pxLCDParamaters->ptr_str ) - ( lcdSTRING_LEN - 1 ) ) )
247 /* ....move the display position forward by one
250 prvDisplayNextString( pxLCDParamaters->Line, &( pxLCDParamaters->ptr_str[ usPosition ] ) );
258 /*-----------------------------------------------------------*/
260 void prvSetupButtonIOAndInterrupts( void )
262 /* Configure SW 1-3 pin settings */
263 PORT3.PDR.BIT.B1 = 0; /* Switch 1 - Port 3.1 - IRQ1 */
264 PORT3.PDR.BIT.B3 = 0; /* Switch 2 - Port 3.3 - IRQ3 */
265 PORT3.PDR.BIT.B4 = 0; /* Switch 3 - Port 3.4 - IRQ4 */
267 PORT3.PMR.BIT.B1 = 1;
268 PORT3.PMR.BIT.B3 = 1;
269 PORT3.PMR.BIT.B4 = 1;
271 MPC.PWPR.BIT.B0WI = 0; /* Writing to the PFSWE bit is enabled */
272 MPC.PWPR.BIT.PFSWE = 1; /* Writing to the PFS register is enabled */
273 MPC.P31PFS.BIT.ISEL = 1;
274 MPC.P33PFS.BIT.ISEL = 1;
275 MPC.P34PFS.BIT.ISEL = 1;
278 ICU.IER[ 0x08 ].BIT.IEN1 = 1;
279 ICU.IPR[ 65 ].BIT.IPR = configMAX_SYSCALL_INTERRUPT_PRIORITY - 1;
280 ICU.IR[ 65 ].BIT.IR = 0;
281 ICU.IRQCR[ 1 ].BIT.IRQMD = 2; /* Rising edge */
284 ICU.IER[ 0x08 ].BIT.IEN3 = 1;
285 ICU.IPR[ 67 ].BIT.IPR = configMAX_SYSCALL_INTERRUPT_PRIORITY - 1;
286 ICU.IR[ 67 ].BIT.IR = 0;
287 ICU.IRQCR[ 3 ].BIT.IRQMD = 2; /* Rising edge */
290 ICU.IER[ 0x08 ].BIT.IEN4 = 1;
291 ICU.IPR[ 68 ].BIT.IPR = configMAX_SYSCALL_INTERRUPT_PRIORITY - 1;
292 ICU.IR[ 68 ].BIT.IR = 0;
293 ICU.IRQCR[ 4 ].BIT.IRQMD = 2; /* Rising edge */
295 /*-----------------------------------------------------------*/
297 static prvScrollString( unsigned char *pucDirection, unsigned short *pusPosition, size_t xStringLength )
299 /* Check which way to scroll. */
300 if( *pucDirection == lcdRIGHT_TO_LEFT )
302 /* Move to the next character. */
305 /* Has the end of the string been reached? */
306 if( ( *pusPosition ) == ( xStringLength - ( lcdSTRING_LEN - 1 ) ) )
308 /* Switch direction. */
309 *pucDirection = lcdLEFT_TO_RIGHT;
315 /* Move (backward) to the next character. */
317 if( *pusPosition == 0U )
319 /* Switch Direction. */
320 *pucDirection = lcdRIGHT_TO_LEFT;
324 /*-----------------------------------------------------------*/
326 static void prvDisplayNextString( unsigned char ucLine, char *pcString )
328 static char cSingleLine[ lcdSTRING_LEN + 1 ];
330 xSemaphoreTake( xLCDMutex, portMAX_DELAY );
331 strncpy( cSingleLine, pcString, lcdSTRING_LEN );
332 DisplayString( ucLine, cSingleLine );
333 xSemaphoreGive( xLCDMutex );
335 /*-----------------------------------------------------------*/
337 static portBASE_TYPE prvSendCommandOnDebouncedInput( TickType_t *pxTimeLastInterrupt, unsigned char ucCommand )
339 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
340 TickType_t xCurrentTickCount;
342 /* Check the time now for debouncing purposes. */
343 xCurrentTickCount = xTaskGetTickCountFromISR();
345 /* Has enough time passed since the button was last push to accept it as a
347 if( ( xCurrentTickCount - *pxTimeLastInterrupt ) > lcdMIN_TIME_BETWEEN_INTERRUPTS_MS )
349 xQueueSendToBackFromISR( xButtonCommandQueue, &ucCommand, &xHigherPriorityTaskWoken );
352 /* Remember the time now, so debounce can be performed again on the next
354 *pxTimeLastInterrupt = xCurrentTickCount;
356 return xHigherPriorityTaskWoken;
358 /*-----------------------------------------------------------*/
360 static void prvIRQ1_Handler( void )
362 static TickType_t xTimeLastInterrupt = 0UL;
363 static const unsigned char ucCommand = lcdSHIFT_BACK_COMMAND;
364 portBASE_TYPE xHigherPriorityTaskWoken;
366 xHigherPriorityTaskWoken = prvSendCommandOnDebouncedInput( &xTimeLastInterrupt, ucCommand );
367 portYIELD_FROM_ISR( xHigherPriorityTaskWoken );
369 /*-----------------------------------------------------------*/
371 static void prvIRQ3_Handler(void)
373 static TickType_t xTimeLastInterrupt = 0UL;
374 static const unsigned char ucCommand = lcdSTART_STOP_COMMAND;
375 portBASE_TYPE xHigherPriorityTaskWoken;
377 xHigherPriorityTaskWoken = prvSendCommandOnDebouncedInput( &xTimeLastInterrupt, ucCommand );
378 portYIELD_FROM_ISR( xHigherPriorityTaskWoken );
380 /*-----------------------------------------------------------*/
382 static void prvIRQ4_Handler(void)
384 static TickType_t xTimeLastInterrupt = 0UL;
385 static const unsigned char ucCommand = lcdSHIFT_FORWARD_COMMAND;
386 portBASE_TYPE xHigherPriorityTaskWoken;
388 xHigherPriorityTaskWoken = prvSendCommandOnDebouncedInput( &xTimeLastInterrupt, ucCommand );
389 portYIELD_FROM_ISR( xHigherPriorityTaskWoken );