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lpc17xx_40xx_systick_arch.c
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1 /**********************************************************************
2 * @brief Setups up the LWIP timebase (tick)
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 "lwip/opt.h"
33
34 #if NO_SYS == 1
35
36 #include "chip.h"
37 #include "lpc_arch.h"
38
43 /*****************************************************************************
44 * Private types/enumerations/variables
45 ****************************************************************************/
46
47 /* Saved reference period foe standalone mode */
48 static uint32_t saved_period;
49
50 /* Saved total time in mS since timer was enabled */
51 static volatile u32_t systick_timems;
52
53 /*****************************************************************************
54 * Public types/enumerations/variables
55 ****************************************************************************/
56
57 /* Current system clock rate, mainly used for sysTick */
58 extern uint32_t SystemCoreClock;
59
60 /*****************************************************************************
61 * Private functions
62 ****************************************************************************/
63
64 /*****************************************************************************
65 * Public functions
66 ****************************************************************************/
67
68 /* Enable LWIP tick and interrupt */
69 void SysTick_Enable(uint32_t period)
70 {
71 /* Initialize System Tick with time interval */
72 // SYSTICK_InternalInit(period); // FIXME
73 // saved_period = period; // FIXME
74 // systick_timems = 0; // FIXME
75
76 /* Enable System Tick interrupt */
77 // SYSTICK_IntCmd(ENABLE); // FIXME
78
79 /* Enable System Tick Counter */
80 // SYSTICK_Cmd(ENABLE); // FIXME
81
82 saved_period = period;
83 SysTick_Config((SystemCoreClock * period) / 1000);
84 }
85
86 /* Disable LWIP tick */
87 void SysTick_Disable(void)
88 {
89 /* Disable System Tick Counter */
90 // SYSTICK_Cmd(DISABLE); // FIXME
91
92 /* Disable System Tick interrupt */
93 // SYSTICK_IntCmd(DISABLE); // FIXME
94
95 SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk;
96 }
97
104 void SysTick_Handler(void)
105 {
106 /* Clear System Tick counter flag */
107 // SYSTICK_ClearCounterFlag(); // FIXME
108
109 /* Increment tick count */
110 systick_timems += saved_period;
111 }
112
113
114 /* Get the current systick time in milliSeconds */
115 uint32_t SysTick_GetMS(void)
116 {
117 return systick_timems;
118 }
119
120 /* Delay for the specified number of milliSeconds */
121 void msDelay(uint32_t ms)
122 {
123 uint32_t to = ms + systick_timems;
124
125 while (to > systick_timems) {}
126 }
127
133 u32_t sys_now(void)
134 {
135 return (u32_t) SysTick_GetMS();
136 }
137
142 #endif /* NO_SYS == 1 */