1 | //*****************************************************************************
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2 | // +--+
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3 | // | ++----+
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4 | // +-++ |
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5 | // | |
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6 | // +-+--+ |
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7 | // | +--+--+
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8 | // +----+ Copyright (c) 2010-11 Code Red Technologies Ltd.
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9 | //
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10 | // LED flashing Timer16 application for LPCXPresso1114 board
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11 | //
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12 | // Software License Agreement
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13 | //
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14 | // The software is owned by Code Red Technologies and/or its suppliers, and is
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15 | // protected under applicable copyright laws. All rights are reserved. Any
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16 | // use in violation of the foregoing restrictions may subject the user to criminal
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17 | // sanctions under applicable laws, as well as to civil liability for the breach
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18 | // of the terms and conditions of this license.
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19 | //
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20 | // THIS SOFTWARE IS PROVIDED "AS IS". NO WARRANTIES, WHETHER EXPRESS, IMPLIED
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21 | // OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
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22 | // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
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23 | // USE OF THIS SOFTWARE FOR COMMERCIAL DEVELOPMENT AND/OR EDUCATION IS SUBJECT
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24 | // TO A CURRENT END USER LICENSE AGREEMENT (COMMERCIAL OR EDUCATIONAL) WITH
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25 | // CODE RED TECHNOLOGIES LTD.
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26 | //
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27 | //*****************************************************************************
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28 |
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29 |
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30 | #include "LPC11xx.h" /* LPC11xx definitions */
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31 | #include "timer16.h"
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32 | #include "clkconfig.h"
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33 | #include "gpio.h"
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34 |
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35 | #include <cr_section_macros.h>
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36 | #include <NXP/crp.h>
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37 |
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38 | // Variable to store CRP value in. Will be placed automatically
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39 | // by the linker when "Enable Code Read Protect" selected.
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40 | // See crp.h header for more information
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41 | __CRP const unsigned int CRP_WORD = CRP_NO_CRP ;
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42 |
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43 | // LPCXpresso processor card LED
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44 | #define LED_PORT 0 // Port for led
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45 | #define LED_BIT 7 // Bit on port for led
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46 | #define LED_ON 1 // Level to set port to turn on led
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47 | #define LED_OFF 0 // Level to set port to turn off led
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48 |
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49 | extern volatile uint32_t timer16_0_counter;
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50 |
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51 | int main (void)
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52 | {
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53 | GPIOInit();
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54 |
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55 | // Initialise Timer16_0 to tick at rate of 1/2000th of second.
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56 | // Note that as this is a 16 bit timer, the maximum count we can
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57 | // load into timer is 0xFFFF, or 65535. Default clock speed
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58 | // set up by CMSIS SystemInit function - SystemCoreClock - is
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59 | // 48MHz or 48000000 Hz. Dividing this by 2000 is 24000 which is
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60 | // within appropriate timer16 maximum. This could be extended
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61 | // if timer routine extended to make use of Prescale Counter register
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62 | // Note by default LPC_SYSCON->SYSAHBCLKDIV is 1.
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63 | init_timer16(0, (SystemCoreClock/LPC_SYSCON->SYSAHBCLKDIV)/2000 );
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64 |
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65 | // Initialise counter that counts Timer16_0 ticks
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66 | timer16_0_counter = 0;
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67 |
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68 | //Enable Timer16_0
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69 | enable_timer16(0);
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70 |
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71 | // Set port for LED to output
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72 | GPIOSetDir( LED_PORT, LED_BIT, 1 );
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73 | GPIOSetDir( 0, 10, 1 ); // Set PORT0 direction Bit10 to output
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74 |
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75 | while (1) /* Loop forever */
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76 | {
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77 |
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78 | // LED is on for 1st half-second
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79 | if ( (timer16_0_counter > 0) && (timer16_0_counter <= 1000) )
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80 | {
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81 | GPIOSetValue( LED_PORT, LED_BIT, LED_OFF );
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82 | GPIOSetValue(0,10,1); // PORT0 Bit10 High
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83 | }
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84 |
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85 | // LED is off for 2nd half-second
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86 | if ( (timer16_0_counter > 1000) && (timer16_0_counter <= 2000) )
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87 | {
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88 | GPIOSetValue( LED_PORT, LED_BIT, LED_ON );
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89 | GPIOSetValue(0,10,0); // PORT0 Bit10 Low
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90 | }
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91 |
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92 | // Reset counter
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93 | else if ( timer16_0_counter > 2000 )
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94 | {
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95 | timer16_0_counter = 0;
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96 | }
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97 | }
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98 | }
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