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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) && (configUSE_CUSTOM_TICK == 1))
44 
45  /*****************************************************************************
46  * Private types/enumerations/variables
47  ****************************************************************************/
48 
49 #define portNVIC_PENDSVSET 0x10000000
50 #define portNVIC_INT_CTRL ((volatile unsigned long *) 0xe000ed04)
51 #define portMIN_INTERRUPT_PRIORITY (255UL)
52 #define portNVIC_SYSTICK_PRI portMIN_INTERRUPT_PRIORITY
53 
54 #define RITENCLR (1 << 1)
55 #define RITINT (1 << 0)
56 
57 /* Timer reload value for next tick */
58 static uint32_t reload_val;
59 
60 /*****************************************************************************
61  * Public types/enumerations/variables
62  ****************************************************************************/
63 
64 /* FreeRTOS tick update function */
65 extern void vTaskIncrementTick(void);
66 
67 /*****************************************************************************
68  * Private functions
69  ****************************************************************************/
70 
71 /*****************************************************************************
72  * Public functions
73  ****************************************************************************/
74 
80 void xPortSysTickHandler(void)
81 {
82  unsigned long ulDummy;
83 
84  /* TODO: check if WWDT interrupt and redirect */
86  Chip_RIT_SetCOMPVAL(Chip_RIT_GetCounter() + reload_val);/* Reload value */
87 
88 #if configUSE_PREEMPTION == 1
89  /* If using preemption, also force a context switch. */
90  *(portNVIC_INT_CTRL) = portNVIC_PENDSVSET;
91 #endif
92 
93  ulDummy = portSET_INTERRUPT_MASK_FROM_ISR();
94  {
95  vTaskIncrementTick();
96  }
97  portCLEAR_INTERRUPT_MASK_FROM_ISR(ulDummy);
98 }
99 
106 void prvSetupTimerInterrupt(void)
107 {
108  /* Clear any pending interrupt */
110 
111  /* Calculate reload value */
112  reload_val = (configCPU_CLOCK_HZ / configTICK_RATE_HZ);
113  Chip_RIT_SetCOMPVAL(Chip_RIT_GetCounter() + reload_val);/* Start tick */
114 
115  /* Set the priority and enable the interrupt */
116  NVIC_SetPriority((IRQn_Type) RITIMER_IRQn, portNVIC_SYSTICK_PRI);
117  NVIC_EnableIRQ((IRQn_Type) RITIMER_IRQn);
118 }
119 
120 #endif
121