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rgu_18xx_43xx.c
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1 /*
2  * @brief LPC18xx/43xx Reset Generator Unit driver
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 "rgu_18xx_43xx.h"
33 
34 /*****************************************************************************
35  * Private types/enumerations/variables
36  ****************************************************************************/
37 
38 /*****************************************************************************
39  * Public types/enumerations/variables
40  ****************************************************************************/
41 
42 /*****************************************************************************
43  * Private functions
44  ****************************************************************************/
45 
46 /*****************************************************************************
47  * Public functions
48  ****************************************************************************/
49 
50 /* Trigger a peripheral reset for the selected peripheral */
52 {
53  volatile uint32_t *p;
54 
55  /* To trigger reset- write RESET_CTRLx with a 1 bit */
56  p = (volatile uint32_t *) &(LPC_RGU->RESET_CTRL0);
57 
58  /* higher numbers are in RESET_CTRL1, RESET_CTRL2, etc. */
59  p += ResetNumber / 32;
60 
61  /* On the LPC18xx and LPC43xx, most of the reset bits automatically clear
62  after 1 clock cycle, so set the bit and return */
63  *p = (1 << (ResetNumber % 32));
64 }
65 
66 /* Clears reset for the selected peripheral */
68 {
69  volatile uint32_t *p;
70 
71  /* To trigger reset- write RESET_CTRLx with a 1 bit */
72  p = (volatile uint32_t *) &(LPC_RGU->RESET_CTRL0);
73 
74  /* higher numbers are in RESET_CTRL1, RESET_CTRL2, etc. */
75  p += ResetNumber / 32;
76 
77  /* On the LPC18xx and LPC43xx, most of the reset bits automatically clear
78  after 1 clock cycle, so set the bit and return */
79  *p = 0;
80 }
81 
82 /* Checks the reset status of a peripheral */
83 bool Chip_RGU_InReset(RGU_RST_TYPE ResetNumber)
84 {
85  volatile uint32_t *read;
86 
87  read = (volatile uint32_t *) &(LPC_RGU->RESET_ACTIVE_STATUS0);
88  read += ResetNumber / 32;
89 
90  /* Reset not asserted if bit is set */
91  return (bool) ((*read & (1 << (ResetNumber % 32))) == 0);
92 }