LPCOpen Platform for LPC18XX/43XX microcontrollers: C:/w/lpcopen_docs/software/freertos/freertoslpc/FreeRTOS_lpc43xx_m0_Tick.c Source File

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FreeRTOS_lpc43xx_m0_Tick.c
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1 /*
2 * @brief FreeRTOS LPC43xx M0 core tick function using RITimer
3 *
4 * @note
5 * Copyright(C) NXP Semiconductors, 2012
6 * All rights reserved.
7 *
8 * @par
9 * Software that is described herein is for illustrative purposes only
10 * which provides customers with programming information regarding the
11 * LPC products. This software is supplied "AS IS" without any warranties of
12 * any kind, and NXP Semiconductors and its licensor disclaim any and
13 * all warranties, express or implied, including all implied warranties of
14 * merchantability, fitness for a particular purpose and non-infringement of
15 * intellectual property rights. NXP Semiconductors assumes no responsibility
16 * or liability for the use of the software, conveys no license or rights under any
17 * patent, copyright, mask work right, or any other intellectual property rights in
18 * or to any products. NXP Semiconductors reserves the right to make changes
19 * in the software without notification. NXP Semiconductors also makes no
20 * representation or warranty that such application will be suitable for the
21 * specified use without further testing or modification.
22 *
23 * @par
24 * Permission to use, copy, modify, and distribute this software and its
25 * documentation is hereby granted, under NXP Semiconductors' and its
26 * licensor's relevant copyrights in the software, without fee, provided that it
27 * is used in conjunction with NXP Semiconductors microcontrollers. This
28 * copyright, permission, and disclaimer notice must appear in all copies of
29 * this code.
30 */
31
32 #include "chip.h"
33 #include "FreeRTOS.h"
34
43 #if (defined(CHIP_LPC43XX) && defined(CORE_M0))
44
45 /*****************************************************************************
46 * Private types/enumerations/variables
47 ****************************************************************************/
48
49 #define portNVIC_PENDSVSET 0x10000000
50 #ifndef portNVIC_INT_CTRL
51 #define portNVIC_INT_CTRL ((volatile unsigned long *) 0xe000ed04)
52 #endif
53 #define portMIN_INTERRUPT_PRIORITY (255UL)
54 #define portNVIC_SYSTICK_PRI portMIN_INTERRUPT_PRIORITY
55
56 #define RITENCLR (1 << 1)
57 #define RITINT (1 << 0)
58
59 /* Timer reload value for next tick */
60 static uint32_t reload_val;
61
62 /*****************************************************************************
63 * Public types/enumerations/variables
64 ****************************************************************************/
65
66 /* FreeRTOS tick update function */
67 extern BaseType_t xTaskIncrementTick(void);
68
69 /*****************************************************************************
70 * Private functions
71 ****************************************************************************/
72
73 /*****************************************************************************
74 * Public functions
75 ****************************************************************************/
76
82 void RIT_IRQHandler(void)
83 {
84 unsigned long ulPreviousMask;
85
86 /* TODO: check if WWDT interrupt and redirect */
87 Chip_RIT_ClearInt(LPC_RITIMER);
88 Chip_RIT_SetCOMPVAL(LPC_RITIMER, Chip_RIT_GetCounter(LPC_RITIMER) + reload_val);/* Reload value */
89
90 #if configUSE_PREEMPTION == 1
91 /* If using preemption, also force a context switch. */
92 *(portNVIC_INT_CTRL) = portNVIC_PENDSVSET;
93 #endif
94
95 ulPreviousMask = portSET_INTERRUPT_MASK_FROM_ISR();
96 {
97 /* Increment the RTOS tick. */
98 if( xTaskIncrementTick() != pdFALSE )
99 {
100 /* Pend a context switch. */
101 *(portNVIC_INT_CTRL) = portNVIC_PENDSVSET;
102 }
103 }
104 portCLEAR_INTERRUPT_MASK_FROM_ISR( ulPreviousMask );
105 }
106
113 void ritimer_setup(void)
114 {
115 /* Clear any pending interrupt */
116 Chip_RIT_ClearInt(LPC_RITIMER);
117
118 /* Calculate reload value */
119 reload_val = (configCPU_CLOCK_HZ / configTICK_RATE_HZ);
120 Chip_RIT_SetCOMPVAL(LPC_RITIMER, Chip_RIT_GetCounter(LPC_RITIMER) + reload_val);/* Start tick */
121
122 /* Set the priority and enable the interrupt */
123 NVIC_SetPriority((IRQn_Type) RITIMER_IRQn, portNVIC_SYSTICK_PRI);
124 NVIC_EnableIRQ((IRQn_Type) RITIMER_IRQn);
125 }
126
127 #endif
128