1 /*
2 * @brief General Purpose Input/Output example
3 *
4 * @note
5 * Copyright(C) NXP Semiconductors, 2013
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 "board.h"
33
34 /*****************************************************************************
35 * Private types/enumerations/variables
36 ****************************************************************************/
37
38 /* Number of tickrate per second */
39 #define TICKRATE_HZ (10)
40
41 #if defined(BOARD_NXP_LPCXPRESSO_1549)
42 /* LPCXpresso LPC1549 board has LEDs on P0_0, P0_1, and P0_24. We'll toggle them
43 all at once. */
44 #define PORT_MASK ((1 << 0) | (1 << 1) | (1 << 24))
45
46 #else
47 #error "No PORT_MASK defined"
48 #endif /* defined(BOARD_NXP_LPCXPRESSO_1549) */
49
50 /*****************************************************************************
51 * Public types/enumerations/variables
52 ****************************************************************************/
53
54 /*****************************************************************************
55 * Private functions
56 ****************************************************************************/
57
58 /*****************************************************************************
59 * Public functions
60 ****************************************************************************/
61
62 /**
63 * @brief Handle interrupt from SysTick timer
64 * @return Nothing
65 */
SysTick_Handler(void)66 void SysTick_Handler(void)
67 {
68 uint32_t states;
69
70 /* Get current masked port states */
71 states = Chip_GPIO_GetMaskedPortValue(LPC_GPIO, 0);
72
73 /* Toggle all the states */
74 states = ~states;
75
76 /* Write states back via masked set function. Only the enanled
77 (masked states) will be changed. */
78 Chip_GPIO_SetMaskedPortValue(LPC_GPIO, 0, states);
79 }
80
81 /**
82 * @brief Main program body
83 * @return Does not return
84 */
main(void)85 int main(void) {
86
87 /* Generic Initialization */
88 SystemCoreClockUpdate();
89 Board_Init();
90
91 /* Chip_GPIO_Init(LPC_GPIO) is called as part of Board_Init() */
92
93 /* Set port 0 pins to the output direction */
94 Chip_GPIO_SetPortDIROutput(LPC_GPIO, 0, PORT_MASK);
95
96 /* Set GPIO port mask value to make sure only port 0
97 selected pins are activated during writes */
98 Chip_GPIO_SetPortMask(LPC_GPIO, 0, ~PORT_MASK);
99
100 /* Enable SysTick Timer */
101 SysTick_Config(SystemCoreClock / TICKRATE_HZ);
102
103 /* All work happens in the systick interrupt handler */
104 while (1) {
105 __WFI();
106 }
107
108 return 0;
109 }
110