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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 */
85 Chip_RIT_ClearInt(LPC_RITIMER);
86 Chip_RIT_SetCOMPVAL(LPC_RITIMER, Chip_RIT_GetCounter(LPC_RITIMER) + 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 */
109 Chip_RIT_ClearInt(LPC_RITIMER);
110
111 /* Calculate reload value */
112 reload_val = (configCPU_CLOCK_HZ / configTICK_RATE_HZ);
113 Chip_RIT_SetCOMPVAL(LPC_RITIMER, Chip_RIT_GetCounter(LPC_RITIMER) + 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