LPCOpen Platform  v1.03
LPCOpen Platform for NXP LPC Microcontrollers
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swm_8xx.c
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1 /*
2  * @brief LPC8xx Pin Switch Matrix 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 licenser 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 #define PINASSIGN_IDX(movable) ((movable >> 4))
39 #define PINSHIFT(movable) (8 * (movable & (0xF)))
40 
41 /*****************************************************************************
42  * Public types/enumerations/variables
43  ****************************************************************************/
44 
45 /*****************************************************************************
46  * Private functions
47  ****************************************************************************/
48 
49 /*****************************************************************************
50  * Public functions
51  ****************************************************************************/
52 
53 /* assign a movable pin function to a physical pin */
54 void Chip_SWM_MovablePinAssign(CHIP_SWM_PIN_MOVABLE_T movable, CHIP_PINx_T pin)
55 {
56  uint32_t temp;
57  temp = LPC_SWM->PINASSIGN[PINASSIGN_IDX(movable)] & (~(0xFF << PINSHIFT(movable)));
58  LPC_SWM->PINASSIGN[PINASSIGN_IDX(movable)] = temp | (pin << PINSHIFT(movable));
59 }
60 
61 /* true enables, false disables a Switch Matrix fixed-pin Function */
62 void Chip_SWM_FixedPinEnable(CHIP_SWM_PIN_FIXED_T pin, bool enable)
63 {
64  if (enable) { /* clear the bit */
65  LPC_SWM->PINENABLE0 &= ~(1 << pin);
66  }
67  else { /* set the bit */
68  LPC_SWM->PINENABLE0 |= (1 << pin);
69  }
70 }
71 
72 /* returns true if pin function is enabled, false if disabled */
73 bool Chip_SWM_IsEnabled(CHIP_SWM_PIN_FIXED_T pin)
74 {
75  if (LPC_SWM->PINENABLE0 & (1 << pin)) {
76  return false; /* the bit is set, has not been enabled */
77  }
78  return true;/* the bit is not set, therefore is enabled */
79 }