diff options
| author | Yuval Adam <yuv.adm@gmail.com> | 2014-06-29 12:34:32 +0300 |
|---|---|---|
| committer | Yuval Adam <yuv.adm@gmail.com> | 2014-06-29 12:34:32 +0300 |
| commit | c3e4c9a25c2910d2d66d52215b3406b13d5b23d5 (patch) | |
| tree | added370d1e356901f8579f076e3263fb0464db7 /boards/ek-tm4c123gxl/freertos_demo/switch_task.c | |
| parent | 990090a4cc9070837d31e66b58d40f0c3d038741 (diff) | |
Add more board models
Diffstat (limited to 'boards/ek-tm4c123gxl/freertos_demo/switch_task.c')
| -rw-r--r-- | boards/ek-tm4c123gxl/freertos_demo/switch_task.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/boards/ek-tm4c123gxl/freertos_demo/switch_task.c b/boards/ek-tm4c123gxl/freertos_demo/switch_task.c new file mode 100644 index 0000000..cc90b73 --- /dev/null +++ b/boards/ek-tm4c123gxl/freertos_demo/switch_task.c @@ -0,0 +1,177 @@ +//*****************************************************************************
+//
+// switch_task.c - A simple switch task to process the buttons.
+//
+// Copyright (c) 2012-2014 Texas Instruments Incorporated. All rights reserved.
+// Software License Agreement
+//
+// Texas Instruments (TI) is supplying this software for use solely and
+// exclusively on TI's microcontroller products. The software is owned by
+// TI and/or its suppliers, and is protected under applicable copyright
+// laws. You may not combine this software with "viral" open-source
+// software in order to form a larger program.
+//
+// THIS SOFTWARE IS PROVIDED "AS IS" AND WITH ALL FAULTS.
+// NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT
+// NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. TI SHALL NOT, UNDER ANY
+// CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
+// DAMAGES, FOR ANY REASON WHATSOEVER.
+//
+// This is part of revision 2.1.0.12573 of the EK-TM4C123GXL Firmware Package.
+//
+//*****************************************************************************
+
+#include <stdbool.h>
+#include <stdint.h>
+#include "inc/hw_memmap.h"
+#include "inc/hw_types.h"
+#include "inc/hw_gpio.h"
+#include "driverlib/sysctl.h"
+#include "driverlib/gpio.h"
+#include "driverlib/rom.h"
+#include "drivers/buttons.h"
+#include "utils/uartstdio.h"
+#include "switch_task.h"
+#include "led_task.h"
+#include "priorities.h"
+#include "FreeRTOS.h"
+#include "task.h"
+#include "queue.h"
+#include "semphr.h"
+
+//*****************************************************************************
+//
+// The stack size for the display task.
+//
+//*****************************************************************************
+#define SWITCHTASKSTACKSIZE 128 // Stack size in words
+
+extern xQueueHandle g_pLEDQueue;
+extern xSemaphoreHandle g_pUARTSemaphore;
+
+//*****************************************************************************
+//
+// This task reads the buttons' state and passes this information to LEDTask.
+//
+//*****************************************************************************
+static void
+SwitchTask(void *pvParameters)
+{
+ portTickType ui16LastTime;
+ uint32_t ui32SwitchDelay = 25;
+ uint8_t ui8CurButtonState, ui8PrevButtonState;
+ uint8_t ui8Message;
+
+ ui8CurButtonState = ui8PrevButtonState = 0;
+
+ //
+ // Get the current tick count.
+ //
+ ui16LastTime = xTaskGetTickCount();
+
+ //
+ // Loop forever.
+ //
+ while(1)
+ {
+ //
+ // Poll the debounced state of the buttons.
+ //
+ ui8CurButtonState = ButtonsPoll(0, 0);
+
+ //
+ // Check if previous debounced state is equal to the current state.
+ //
+ if(ui8CurButtonState != ui8PrevButtonState)
+ {
+ ui8PrevButtonState = ui8CurButtonState;
+
+ //
+ // Check to make sure the change in state is due to button press
+ // and not due to button release.
+ //
+ if((ui8CurButtonState & ALL_BUTTONS) != 0)
+ {
+ if((ui8CurButtonState & ALL_BUTTONS) == LEFT_BUTTON)
+ {
+ ui8Message = LEFT_BUTTON;
+
+ //
+ // Guard UART from concurrent access.
+ //
+ xSemaphoreTake(g_pUARTSemaphore, portMAX_DELAY);
+ UARTprintf("Left Button is pressed.\n");
+ xSemaphoreGive(g_pUARTSemaphore);
+ }
+ else if((ui8CurButtonState & ALL_BUTTONS) == RIGHT_BUTTON)
+ {
+ ui8Message = RIGHT_BUTTON;
+
+ //
+ // Guard UART from concurrent access.
+ //
+ xSemaphoreTake(g_pUARTSemaphore, portMAX_DELAY);
+ UARTprintf("Right Button is pressed.\n");
+ xSemaphoreGive(g_pUARTSemaphore);
+ }
+
+ //
+ // Pass the value of the button pressed to LEDTask.
+ //
+ if(xQueueSend(g_pLEDQueue, &ui8Message, portMAX_DELAY) !=
+ pdPASS)
+ {
+ //
+ // Error. The queue should never be full. If so print the
+ // error message on UART and wait for ever.
+ //
+ UARTprintf("\nQueue full. This should never happen.\n");
+ while(1)
+ {
+ }
+ }
+ }
+ }
+
+ //
+ // Wait for the required amount of time to check back.
+ //
+ vTaskDelayUntil(&ui16LastTime, ui32SwitchDelay / portTICK_RATE_MS);
+ }
+}
+
+//*****************************************************************************
+//
+// Initializes the switch task.
+//
+//*****************************************************************************
+uint32_t
+SwitchTaskInit(void)
+{
+ //
+ // Unlock the GPIO LOCK register for Right button to work.
+ //
+ HWREG(GPIO_PORTF_BASE + GPIO_O_LOCK) = GPIO_LOCK_KEY;
+ HWREG(GPIO_PORTF_BASE + GPIO_O_CR) = 0xFF;
+
+ //
+ // Initialize the buttons
+ //
+ ButtonsInit();
+
+ //
+ // Create the switch task.
+ //
+ if(xTaskCreate(SwitchTask, (signed portCHAR *)"Switch",
+ SWITCHTASKSTACKSIZE, NULL, tskIDLE_PRIORITY +
+ PRIORITY_SWITCH_TASK, NULL) != pdTRUE)
+ {
+ return(1);
+ }
+
+ //
+ // Success.
+ //
+ return(0);
+}
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