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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 "chip.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 */
51 void Chip_RGU_TriggerReset(CHIP_RGU_RST_T ResetNumber)
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 */
67 void Chip_RGU_ClearReset(CHIP_RGU_RST_T ResetNumber)
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(CHIP_RGU_RST_T 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 }