Frank 26080115
These are the examples provided for [[/users/frank26080115/libraries/LPC1700CMSIS_Lib/]] Note, the entire "program" is not compilable!
SysTick/STCLK/systick_stclk.c@0:bf7b9fba3924, 2011-03-20 (annotated)
- Committer:
- frank26080115
- Date:
- Sun Mar 20 05:38:56 2011 +0000
- Revision:
- 0:bf7b9fba3924
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| frank26080115 | 0:bf7b9fba3924 | 1 | /***********************************************************************//** |
| frank26080115 | 0:bf7b9fba3924 | 2 | * @file systick_stclk.c |
| frank26080115 | 0:bf7b9fba3924 | 3 | * @purpose This example describes how to configure System Tick to use |
| frank26080115 | 0:bf7b9fba3924 | 4 | * with external clock source STCLK |
| frank26080115 | 0:bf7b9fba3924 | 5 | * @version 2.0 |
| frank26080115 | 0:bf7b9fba3924 | 6 | * @date 21. May. 2010 |
| frank26080115 | 0:bf7b9fba3924 | 7 | * @author NXP MCU SW Application Team |
| frank26080115 | 0:bf7b9fba3924 | 8 | *--------------------------------------------------------------------- |
| frank26080115 | 0:bf7b9fba3924 | 9 | * Software that is described herein is for illustrative purposes only |
| frank26080115 | 0:bf7b9fba3924 | 10 | * which provides customers with programming information regarding the |
| frank26080115 | 0:bf7b9fba3924 | 11 | * products. This software is supplied "AS IS" without any warranties. |
| frank26080115 | 0:bf7b9fba3924 | 12 | * NXP Semiconductors assumes no responsibility or liability for the |
| frank26080115 | 0:bf7b9fba3924 | 13 | * use of the software, conveys no license or title under any patent, |
| frank26080115 | 0:bf7b9fba3924 | 14 | * copyright, or mask work right to the product. NXP Semiconductors |
| frank26080115 | 0:bf7b9fba3924 | 15 | * reserves the right to make changes in the software without |
| frank26080115 | 0:bf7b9fba3924 | 16 | * notification. NXP Semiconductors also make no representation or |
| frank26080115 | 0:bf7b9fba3924 | 17 | * warranty that such application will be suitable for the specified |
| frank26080115 | 0:bf7b9fba3924 | 18 | * use without further testing or modification. |
| frank26080115 | 0:bf7b9fba3924 | 19 | **********************************************************************/ |
| frank26080115 | 0:bf7b9fba3924 | 20 | #include "lpc17xx_libcfg.h" |
| frank26080115 | 0:bf7b9fba3924 | 21 | #include "lpc17xx_gpio.h" |
| frank26080115 | 0:bf7b9fba3924 | 22 | #include "lpc17xx_systick.h" |
| frank26080115 | 0:bf7b9fba3924 | 23 | #include "lpc17xx_pinsel.h" |
| frank26080115 | 0:bf7b9fba3924 | 24 | #include "lpc17xx_timer.h" |
| frank26080115 | 0:bf7b9fba3924 | 25 | |
| frank26080115 | 0:bf7b9fba3924 | 26 | /* Example group ----------------------------------------------------------- */ |
| frank26080115 | 0:bf7b9fba3924 | 27 | /** @defgroup SysTick_STCLK STCLK |
| frank26080115 | 0:bf7b9fba3924 | 28 | * @ingroup SysTick_Examples |
| frank26080115 | 0:bf7b9fba3924 | 29 | * @{ |
| frank26080115 | 0:bf7b9fba3924 | 30 | */ |
| frank26080115 | 0:bf7b9fba3924 | 31 | |
| frank26080115 | 0:bf7b9fba3924 | 32 | /************************** PRIVATE VARIABLES *************************/ |
| frank26080115 | 0:bf7b9fba3924 | 33 | FunctionalState Cur_State = ENABLE; |
| frank26080115 | 0:bf7b9fba3924 | 34 | Bool IO_State = FALSE; |
| frank26080115 | 0:bf7b9fba3924 | 35 | |
| frank26080115 | 0:bf7b9fba3924 | 36 | /************************** PRIVATE FUNCTIONS *************************/ |
| frank26080115 | 0:bf7b9fba3924 | 37 | void SysTick_Handler(void); |
| frank26080115 | 0:bf7b9fba3924 | 38 | |
| frank26080115 | 0:bf7b9fba3924 | 39 | /*----------------- INTERRUPT SERVICE ROUTINES --------------------------*/ |
| frank26080115 | 0:bf7b9fba3924 | 40 | /*********************************************************************//** |
| frank26080115 | 0:bf7b9fba3924 | 41 | * @brief SysTick interrupt handler |
| frank26080115 | 0:bf7b9fba3924 | 42 | * @param None |
| frank26080115 | 0:bf7b9fba3924 | 43 | * @return None |
| frank26080115 | 0:bf7b9fba3924 | 44 | ***********************************************************************/ |
| frank26080115 | 0:bf7b9fba3924 | 45 | void SysTick_Handler(void) |
| frank26080115 | 0:bf7b9fba3924 | 46 | { |
| frank26080115 | 0:bf7b9fba3924 | 47 | //Clear System Tick counter flag |
| frank26080115 | 0:bf7b9fba3924 | 48 | SYSTICK_ClearCounterFlag(); |
| frank26080115 | 0:bf7b9fba3924 | 49 | //toggle P0.0 |
| frank26080115 | 0:bf7b9fba3924 | 50 | if (Cur_State == ENABLE) |
| frank26080115 | 0:bf7b9fba3924 | 51 | { |
| frank26080115 | 0:bf7b9fba3924 | 52 | //pull-down pin |
| frank26080115 | 0:bf7b9fba3924 | 53 | GPIO_ClearValue(0, (1<<0)); |
| frank26080115 | 0:bf7b9fba3924 | 54 | Cur_State = DISABLE; |
| frank26080115 | 0:bf7b9fba3924 | 55 | } |
| frank26080115 | 0:bf7b9fba3924 | 56 | else |
| frank26080115 | 0:bf7b9fba3924 | 57 | { |
| frank26080115 | 0:bf7b9fba3924 | 58 | GPIO_SetValue(0, (1<<0)); |
| frank26080115 | 0:bf7b9fba3924 | 59 | Cur_State = ENABLE; |
| frank26080115 | 0:bf7b9fba3924 | 60 | } |
| frank26080115 | 0:bf7b9fba3924 | 61 | } |
| frank26080115 | 0:bf7b9fba3924 | 62 | |
| frank26080115 | 0:bf7b9fba3924 | 63 | |
| frank26080115 | 0:bf7b9fba3924 | 64 | /*-------------------------MAIN FUNCTION------------------------------*/ |
| frank26080115 | 0:bf7b9fba3924 | 65 | /*********************************************************************//** |
| frank26080115 | 0:bf7b9fba3924 | 66 | * @brief c_entry: Main program body |
| frank26080115 | 0:bf7b9fba3924 | 67 | * @param[in] None |
| frank26080115 | 0:bf7b9fba3924 | 68 | * @return int |
| frank26080115 | 0:bf7b9fba3924 | 69 | **********************************************************************/ |
| frank26080115 | 0:bf7b9fba3924 | 70 | int c_entry (void) |
| frank26080115 | 0:bf7b9fba3924 | 71 | { |
| frank26080115 | 0:bf7b9fba3924 | 72 | PINSEL_CFG_Type PinCfg; |
| frank26080115 | 0:bf7b9fba3924 | 73 | TIM_TIMERCFG_Type TIM_ConfigStruct; |
| frank26080115 | 0:bf7b9fba3924 | 74 | TIM_MATCHCFG_Type TIM_MatchConfigStruct; |
| frank26080115 | 0:bf7b9fba3924 | 75 | |
| frank26080115 | 0:bf7b9fba3924 | 76 | // Conifg P1.28 as MAT0.0 |
| frank26080115 | 0:bf7b9fba3924 | 77 | PinCfg.Funcnum = 3; |
| frank26080115 | 0:bf7b9fba3924 | 78 | PinCfg.OpenDrain = 0; |
| frank26080115 | 0:bf7b9fba3924 | 79 | PinCfg.Pinmode = 0; |
| frank26080115 | 0:bf7b9fba3924 | 80 | PinCfg.Portnum = 1; |
| frank26080115 | 0:bf7b9fba3924 | 81 | PinCfg.Pinnum = 28; |
| frank26080115 | 0:bf7b9fba3924 | 82 | PINSEL_ConfigPin(&PinCfg); |
| frank26080115 | 0:bf7b9fba3924 | 83 | |
| frank26080115 | 0:bf7b9fba3924 | 84 | /* P3.26 as STCLK */ |
| frank26080115 | 0:bf7b9fba3924 | 85 | PinCfg.Funcnum = 1; |
| frank26080115 | 0:bf7b9fba3924 | 86 | PinCfg.OpenDrain = 0; |
| frank26080115 | 0:bf7b9fba3924 | 87 | PinCfg.Pinmode = 0; |
| frank26080115 | 0:bf7b9fba3924 | 88 | PinCfg.Portnum = 3; |
| frank26080115 | 0:bf7b9fba3924 | 89 | PinCfg.Pinnum = 26; |
| frank26080115 | 0:bf7b9fba3924 | 90 | PINSEL_ConfigPin(&PinCfg); |
| frank26080115 | 0:bf7b9fba3924 | 91 | |
| frank26080115 | 0:bf7b9fba3924 | 92 | // Initialize timer 0, prescale count time of 10uS |
| frank26080115 | 0:bf7b9fba3924 | 93 | TIM_ConfigStruct.PrescaleOption = TIM_PRESCALE_USVAL; |
| frank26080115 | 0:bf7b9fba3924 | 94 | TIM_ConfigStruct.PrescaleValue = 10; |
| frank26080115 | 0:bf7b9fba3924 | 95 | |
| frank26080115 | 0:bf7b9fba3924 | 96 | // use channel 0, MR0 |
| frank26080115 | 0:bf7b9fba3924 | 97 | TIM_MatchConfigStruct.MatchChannel = 0; |
| frank26080115 | 0:bf7b9fba3924 | 98 | // Disable interrupt when MR0 matches the value in TC register |
| frank26080115 | 0:bf7b9fba3924 | 99 | TIM_MatchConfigStruct.IntOnMatch = TRUE; |
| frank26080115 | 0:bf7b9fba3924 | 100 | //Enable reset on MR0: TIMER will reset if MR0 matches it |
| frank26080115 | 0:bf7b9fba3924 | 101 | TIM_MatchConfigStruct.ResetOnMatch = TRUE; |
| frank26080115 | 0:bf7b9fba3924 | 102 | //Stop on MR0 if MR0 matches it |
| frank26080115 | 0:bf7b9fba3924 | 103 | TIM_MatchConfigStruct.StopOnMatch = FALSE; |
| frank26080115 | 0:bf7b9fba3924 | 104 | //Toggle MR0.0 pin if MR0 matches it |
| frank26080115 | 0:bf7b9fba3924 | 105 | TIM_MatchConfigStruct.ExtMatchOutputType =TIM_EXTMATCH_TOGGLE; |
| frank26080115 | 0:bf7b9fba3924 | 106 | // Set Match value, count value of 10 (10 * 10uS = 100uS --> 10KHz) |
| frank26080115 | 0:bf7b9fba3924 | 107 | TIM_MatchConfigStruct.MatchValue = 10; |
| frank26080115 | 0:bf7b9fba3924 | 108 | |
| frank26080115 | 0:bf7b9fba3924 | 109 | TIM_Init(LPC_TIM0, TIM_TIMER_MODE,&TIM_ConfigStruct); |
| frank26080115 | 0:bf7b9fba3924 | 110 | TIM_ConfigMatch(LPC_TIM0,&TIM_MatchConfigStruct); |
| frank26080115 | 0:bf7b9fba3924 | 111 | TIM_Cmd(LPC_TIM0,ENABLE); |
| frank26080115 | 0:bf7b9fba3924 | 112 | |
| frank26080115 | 0:bf7b9fba3924 | 113 | GPIO_SetDir(0, (1<<0), 1); //Set P0.0 as output |
| frank26080115 | 0:bf7b9fba3924 | 114 | |
| frank26080115 | 0:bf7b9fba3924 | 115 | //Use P0.0 to test System Tick interrupt |
| frank26080115 | 0:bf7b9fba3924 | 116 | /* Initialize System Tick with 10ms time interval |
| frank26080115 | 0:bf7b9fba3924 | 117 | * Frequency input = 10kHz /2 = 5kHz |
| frank26080115 | 0:bf7b9fba3924 | 118 | * Time input = 10ms |
| frank26080115 | 0:bf7b9fba3924 | 119 | */ |
| frank26080115 | 0:bf7b9fba3924 | 120 | SYSTICK_ExternalInit(5000, 10); |
| frank26080115 | 0:bf7b9fba3924 | 121 | //Enable System Tick interrupt |
| frank26080115 | 0:bf7b9fba3924 | 122 | SYSTICK_IntCmd(ENABLE); |
| frank26080115 | 0:bf7b9fba3924 | 123 | //Enable System Tick Counter |
| frank26080115 | 0:bf7b9fba3924 | 124 | SYSTICK_Cmd(ENABLE); |
| frank26080115 | 0:bf7b9fba3924 | 125 | |
| frank26080115 | 0:bf7b9fba3924 | 126 | while(1); |
| frank26080115 | 0:bf7b9fba3924 | 127 | return 1; |
| frank26080115 | 0:bf7b9fba3924 | 128 | } |
| frank26080115 | 0:bf7b9fba3924 | 129 | |
| frank26080115 | 0:bf7b9fba3924 | 130 | |
| frank26080115 | 0:bf7b9fba3924 | 131 | /* With ARM and GHS toolsets, the entry point is main() - this will |
| frank26080115 | 0:bf7b9fba3924 | 132 | allow the linker to generate wrapper code to setup stacks, allocate |
| frank26080115 | 0:bf7b9fba3924 | 133 | heap area, and initialize and copy code and data segments. For GNU |
| frank26080115 | 0:bf7b9fba3924 | 134 | toolsets, the entry point is through __start() in the crt0_gnu.asm |
| frank26080115 | 0:bf7b9fba3924 | 135 | file, and that startup code will setup stacks and data */ |
| frank26080115 | 0:bf7b9fba3924 | 136 | int main(void) |
| frank26080115 | 0:bf7b9fba3924 | 137 | { |
| frank26080115 | 0:bf7b9fba3924 | 138 | return c_entry(); |
| frank26080115 | 0:bf7b9fba3924 | 139 | } |
| frank26080115 | 0:bf7b9fba3924 | 140 | |
| frank26080115 | 0:bf7b9fba3924 | 141 | #ifdef DEBUG |
| frank26080115 | 0:bf7b9fba3924 | 142 | /******************************************************************************* |
| frank26080115 | 0:bf7b9fba3924 | 143 | * @brief Reports the name of the source file and the source line number |
| frank26080115 | 0:bf7b9fba3924 | 144 | * where the CHECK_PARAM error has occurred. |
| frank26080115 | 0:bf7b9fba3924 | 145 | * @param[in] file Pointer to the source file name |
| frank26080115 | 0:bf7b9fba3924 | 146 | * @param[in] line assert_param error line source number |
| frank26080115 | 0:bf7b9fba3924 | 147 | * @return None |
| frank26080115 | 0:bf7b9fba3924 | 148 | *******************************************************************************/ |
| frank26080115 | 0:bf7b9fba3924 | 149 | void check_failed(uint8_t *file, uint32_t line) |
| frank26080115 | 0:bf7b9fba3924 | 150 | { |
| frank26080115 | 0:bf7b9fba3924 | 151 | /* User can add his own implementation to report the file name and line number, |
| frank26080115 | 0:bf7b9fba3924 | 152 | ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */ |
| frank26080115 | 0:bf7b9fba3924 | 153 | |
| frank26080115 | 0:bf7b9fba3924 | 154 | /* Infinite loop */ |
| frank26080115 | 0:bf7b9fba3924 | 155 | while(1); |
| frank26080115 | 0:bf7b9fba3924 | 156 | } |
| frank26080115 | 0:bf7b9fba3924 | 157 | #endif |
| frank26080115 | 0:bf7b9fba3924 | 158 | |
| frank26080115 | 0:bf7b9fba3924 | 159 | /* |
| frank26080115 | 0:bf7b9fba3924 | 160 | * @} |
| frank26080115 | 0:bf7b9fba3924 | 161 | */ |