Frank 26080115
Date: March 20, 2011 This library is created from "LPC17xx CMSIS-Compliant Standard Peripheral Firmware Driver Library (GNU, Keil, IAR) (Jan 28, 2011)", available from NXP's website, under "All microcontrollers support documents" [[http://ics.nxp.com/support/documents/microcontrollers/?type=software]] You will need to follow [[/projects/libraries/svn/mbed/trunk/LPC1768/LPC17xx.h]] while using this library Examples provided here [[/users/frank26080115/programs/LPC1700CMSIS_Examples/]] The beautiful thing is that NXP does not place copyright protection on any of the files in here Only a few modifications are made to make it compile with the mbed online compiler, I fixed some warnings as well. This is untested as of March 20, 2011 Forum post about this library: [[/forum/mbed/topic/2030/]]
lpc17xx_systick.c@0:84d7747641aa, 2011-03-20 (annotated)
- Committer:
- frank26080115
- Date:
- Sun Mar 20 18:45:15 2011 +0000
- Revision:
- 0:84d7747641aa
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| frank26080115 | 0:84d7747641aa | 1 | /***********************************************************************//** |
| frank26080115 | 0:84d7747641aa | 2 | * @file lpc17xx_systick.c |
| frank26080115 | 0:84d7747641aa | 3 | * @brief Contains all functions support for SYSTICK firmware library on LPC17xx |
| frank26080115 | 0:84d7747641aa | 4 | * @version 2.0 |
| frank26080115 | 0:84d7747641aa | 5 | * @date 21. May. 2010 |
| frank26080115 | 0:84d7747641aa | 6 | * @author NXP MCU SW Application Team |
| frank26080115 | 0:84d7747641aa | 7 | ************************************************************************** |
| frank26080115 | 0:84d7747641aa | 8 | * Software that is described herein is for illustrative purposes only |
| frank26080115 | 0:84d7747641aa | 9 | * which provides customers with programming information regarding the |
| frank26080115 | 0:84d7747641aa | 10 | * products. This software is supplied "AS IS" without any warranties. |
| frank26080115 | 0:84d7747641aa | 11 | * NXP Semiconductors assumes no responsibility or liability for the |
| frank26080115 | 0:84d7747641aa | 12 | * use of the software, conveys no license or title under any patent, |
| frank26080115 | 0:84d7747641aa | 13 | * copyright, or mask work right to the product. NXP Semiconductors |
| frank26080115 | 0:84d7747641aa | 14 | * reserves the right to make changes in the software without |
| frank26080115 | 0:84d7747641aa | 15 | * notification. NXP Semiconductors also make no representation or |
| frank26080115 | 0:84d7747641aa | 16 | * warranty that such application will be suitable for the specified |
| frank26080115 | 0:84d7747641aa | 17 | * use without further testing or modification. |
| frank26080115 | 0:84d7747641aa | 18 | **********************************************************************/ |
| frank26080115 | 0:84d7747641aa | 19 | |
| frank26080115 | 0:84d7747641aa | 20 | /* Peripheral group ----------------------------------------------------------- */ |
| frank26080115 | 0:84d7747641aa | 21 | /** @addtogroup SYSTICK |
| frank26080115 | 0:84d7747641aa | 22 | * @{ |
| frank26080115 | 0:84d7747641aa | 23 | */ |
| frank26080115 | 0:84d7747641aa | 24 | |
| frank26080115 | 0:84d7747641aa | 25 | /* Includes ------------------------------------------------------------------- */ |
| frank26080115 | 0:84d7747641aa | 26 | #include "lpc17xx_systick.h" |
| frank26080115 | 0:84d7747641aa | 27 | #include "lpc17xx_clkpwr.h" |
| frank26080115 | 0:84d7747641aa | 28 | |
| frank26080115 | 0:84d7747641aa | 29 | /* If this source file built with example, the LPC17xx FW library configuration |
| frank26080115 | 0:84d7747641aa | 30 | * file in each example directory ("lpc17xx_libcfg.h") must be included, |
| frank26080115 | 0:84d7747641aa | 31 | * otherwise the default FW library configuration file must be included instead |
| frank26080115 | 0:84d7747641aa | 32 | */ |
| frank26080115 | 0:84d7747641aa | 33 | #ifdef __BUILD_WITH_EXAMPLE__ |
| frank26080115 | 0:84d7747641aa | 34 | #include "lpc17xx_libcfg.h" |
| frank26080115 | 0:84d7747641aa | 35 | #else |
| frank26080115 | 0:84d7747641aa | 36 | #include "lpc17xx_libcfg_default.h" |
| frank26080115 | 0:84d7747641aa | 37 | #endif /* __BUILD_WITH_EXAMPLE__ */ |
| frank26080115 | 0:84d7747641aa | 38 | |
| frank26080115 | 0:84d7747641aa | 39 | |
| frank26080115 | 0:84d7747641aa | 40 | #ifdef _SYSTICK |
| frank26080115 | 0:84d7747641aa | 41 | |
| frank26080115 | 0:84d7747641aa | 42 | /* Public Functions ----------------------------------------------------------- */ |
| frank26080115 | 0:84d7747641aa | 43 | /** @addtogroup SYSTICK_Public_Functions |
| frank26080115 | 0:84d7747641aa | 44 | * @{ |
| frank26080115 | 0:84d7747641aa | 45 | */ |
| frank26080115 | 0:84d7747641aa | 46 | /*********************************************************************//** |
| frank26080115 | 0:84d7747641aa | 47 | * @brief Initial System Tick with using internal CPU clock source |
| frank26080115 | 0:84d7747641aa | 48 | * @param[in] time time interval(ms) |
| frank26080115 | 0:84d7747641aa | 49 | * @return None |
| frank26080115 | 0:84d7747641aa | 50 | **********************************************************************/ |
| frank26080115 | 0:84d7747641aa | 51 | void SYSTICK_InternalInit(uint32_t time) |
| frank26080115 | 0:84d7747641aa | 52 | { |
| frank26080115 | 0:84d7747641aa | 53 | uint32_t cclk; |
| frank26080115 | 0:84d7747641aa | 54 | float maxtime; |
| frank26080115 | 0:84d7747641aa | 55 | |
| frank26080115 | 0:84d7747641aa | 56 | cclk = SystemCoreClock; |
| frank26080115 | 0:84d7747641aa | 57 | /* With internal CPU clock frequency for LPC17xx is 'SystemCoreClock' |
| frank26080115 | 0:84d7747641aa | 58 | * And limit 24 bit for LOAD value |
| frank26080115 | 0:84d7747641aa | 59 | * So the maximum time can be set: |
| frank26080115 | 0:84d7747641aa | 60 | * 1/SystemCoreClock * (2^24) * 1000 (ms) |
| frank26080115 | 0:84d7747641aa | 61 | */ |
| frank26080115 | 0:84d7747641aa | 62 | //check time value is available or not |
| frank26080115 | 0:84d7747641aa | 63 | maxtime = (1<<24)/(SystemCoreClock / 1000) ; |
| frank26080115 | 0:84d7747641aa | 64 | if(time > maxtime) |
| frank26080115 | 0:84d7747641aa | 65 | //Error loop |
| frank26080115 | 0:84d7747641aa | 66 | while(1); |
| frank26080115 | 0:84d7747641aa | 67 | else |
| frank26080115 | 0:84d7747641aa | 68 | { |
| frank26080115 | 0:84d7747641aa | 69 | //Select CPU clock is System Tick clock source |
| frank26080115 | 0:84d7747641aa | 70 | SysTick->CTRL |= ST_CTRL_CLKSOURCE; |
| frank26080115 | 0:84d7747641aa | 71 | /* Set RELOAD value |
| frank26080115 | 0:84d7747641aa | 72 | * RELOAD = (SystemCoreClock/1000) * time - 1 |
| frank26080115 | 0:84d7747641aa | 73 | * with time base is millisecond |
| frank26080115 | 0:84d7747641aa | 74 | */ |
| frank26080115 | 0:84d7747641aa | 75 | SysTick->LOAD = (cclk/1000)*time - 1; |
| frank26080115 | 0:84d7747641aa | 76 | } |
| frank26080115 | 0:84d7747641aa | 77 | } |
| frank26080115 | 0:84d7747641aa | 78 | |
| frank26080115 | 0:84d7747641aa | 79 | /*********************************************************************//** |
| frank26080115 | 0:84d7747641aa | 80 | * @brief Initial System Tick with using external clock source |
| frank26080115 | 0:84d7747641aa | 81 | * @param[in] freq external clock frequency(Hz) |
| frank26080115 | 0:84d7747641aa | 82 | * @param[in] time time interval(ms) |
| frank26080115 | 0:84d7747641aa | 83 | * @return None |
| frank26080115 | 0:84d7747641aa | 84 | **********************************************************************/ |
| frank26080115 | 0:84d7747641aa | 85 | void SYSTICK_ExternalInit(uint32_t freq, uint32_t time) |
| frank26080115 | 0:84d7747641aa | 86 | { |
| frank26080115 | 0:84d7747641aa | 87 | float maxtime; |
| frank26080115 | 0:84d7747641aa | 88 | |
| frank26080115 | 0:84d7747641aa | 89 | /* With external clock frequency for LPC17xx is 'freq' |
| frank26080115 | 0:84d7747641aa | 90 | * And limit 24 bit for RELOAD value |
| frank26080115 | 0:84d7747641aa | 91 | * So the maximum time can be set: |
| frank26080115 | 0:84d7747641aa | 92 | * 1/freq * (2^24) * 1000 (ms) |
| frank26080115 | 0:84d7747641aa | 93 | */ |
| frank26080115 | 0:84d7747641aa | 94 | //check time value is available or not |
| frank26080115 | 0:84d7747641aa | 95 | maxtime = (1<<24)/(freq / 1000) ; |
| frank26080115 | 0:84d7747641aa | 96 | if (time>maxtime) |
| frank26080115 | 0:84d7747641aa | 97 | //Error Loop |
| frank26080115 | 0:84d7747641aa | 98 | while(1); |
| frank26080115 | 0:84d7747641aa | 99 | else |
| frank26080115 | 0:84d7747641aa | 100 | { |
| frank26080115 | 0:84d7747641aa | 101 | //Select external clock is System Tick clock source |
| frank26080115 | 0:84d7747641aa | 102 | SysTick->CTRL &= ~ ST_CTRL_CLKSOURCE; |
| frank26080115 | 0:84d7747641aa | 103 | /* Set RELOAD value |
| frank26080115 | 0:84d7747641aa | 104 | * RELOAD = (freq/1000) * time - 1 |
| frank26080115 | 0:84d7747641aa | 105 | * with time base is millisecond |
| frank26080115 | 0:84d7747641aa | 106 | */ |
| frank26080115 | 0:84d7747641aa | 107 | maxtime = (freq/1000)*time - 1; |
| frank26080115 | 0:84d7747641aa | 108 | SysTick->LOAD = (freq/1000)*time - 1; |
| frank26080115 | 0:84d7747641aa | 109 | } |
| frank26080115 | 0:84d7747641aa | 110 | } |
| frank26080115 | 0:84d7747641aa | 111 | |
| frank26080115 | 0:84d7747641aa | 112 | /*********************************************************************//** |
| frank26080115 | 0:84d7747641aa | 113 | * @brief Enable/disable System Tick counter |
| frank26080115 | 0:84d7747641aa | 114 | * @param[in] NewState System Tick counter status, should be: |
| frank26080115 | 0:84d7747641aa | 115 | * - ENABLE |
| frank26080115 | 0:84d7747641aa | 116 | * - DISABLE |
| frank26080115 | 0:84d7747641aa | 117 | * @return None |
| frank26080115 | 0:84d7747641aa | 118 | **********************************************************************/ |
| frank26080115 | 0:84d7747641aa | 119 | void SYSTICK_Cmd(FunctionalState NewState) |
| frank26080115 | 0:84d7747641aa | 120 | { |
| frank26080115 | 0:84d7747641aa | 121 | CHECK_PARAM(PARAM_FUNCTIONALSTATE(NewState)); |
| frank26080115 | 0:84d7747641aa | 122 | |
| frank26080115 | 0:84d7747641aa | 123 | if(NewState == ENABLE) |
| frank26080115 | 0:84d7747641aa | 124 | //Enable System Tick counter |
| frank26080115 | 0:84d7747641aa | 125 | SysTick->CTRL |= ST_CTRL_ENABLE; |
| frank26080115 | 0:84d7747641aa | 126 | else |
| frank26080115 | 0:84d7747641aa | 127 | //Disable System Tick counter |
| frank26080115 | 0:84d7747641aa | 128 | SysTick->CTRL &= ~ST_CTRL_ENABLE; |
| frank26080115 | 0:84d7747641aa | 129 | } |
| frank26080115 | 0:84d7747641aa | 130 | |
| frank26080115 | 0:84d7747641aa | 131 | /*********************************************************************//** |
| frank26080115 | 0:84d7747641aa | 132 | * @brief Enable/disable System Tick interrupt |
| frank26080115 | 0:84d7747641aa | 133 | * @param[in] NewState System Tick interrupt status, should be: |
| frank26080115 | 0:84d7747641aa | 134 | * - ENABLE |
| frank26080115 | 0:84d7747641aa | 135 | * - DISABLE |
| frank26080115 | 0:84d7747641aa | 136 | * @return None |
| frank26080115 | 0:84d7747641aa | 137 | **********************************************************************/ |
| frank26080115 | 0:84d7747641aa | 138 | void SYSTICK_IntCmd(FunctionalState NewState) |
| frank26080115 | 0:84d7747641aa | 139 | { |
| frank26080115 | 0:84d7747641aa | 140 | CHECK_PARAM(PARAM_FUNCTIONALSTATE(NewState)); |
| frank26080115 | 0:84d7747641aa | 141 | |
| frank26080115 | 0:84d7747641aa | 142 | if(NewState == ENABLE) |
| frank26080115 | 0:84d7747641aa | 143 | //Enable System Tick counter |
| frank26080115 | 0:84d7747641aa | 144 | SysTick->CTRL |= ST_CTRL_TICKINT; |
| frank26080115 | 0:84d7747641aa | 145 | else |
| frank26080115 | 0:84d7747641aa | 146 | //Disable System Tick counter |
| frank26080115 | 0:84d7747641aa | 147 | SysTick->CTRL &= ~ST_CTRL_TICKINT; |
| frank26080115 | 0:84d7747641aa | 148 | } |
| frank26080115 | 0:84d7747641aa | 149 | |
| frank26080115 | 0:84d7747641aa | 150 | /*********************************************************************//** |
| frank26080115 | 0:84d7747641aa | 151 | * @brief Get current value of System Tick counter |
| frank26080115 | 0:84d7747641aa | 152 | * @param[in] None |
| frank26080115 | 0:84d7747641aa | 153 | * @return current value of System Tick counter |
| frank26080115 | 0:84d7747641aa | 154 | **********************************************************************/ |
| frank26080115 | 0:84d7747641aa | 155 | uint32_t SYSTICK_GetCurrentValue(void) |
| frank26080115 | 0:84d7747641aa | 156 | { |
| frank26080115 | 0:84d7747641aa | 157 | return (SysTick->VAL); |
| frank26080115 | 0:84d7747641aa | 158 | } |
| frank26080115 | 0:84d7747641aa | 159 | |
| frank26080115 | 0:84d7747641aa | 160 | /*********************************************************************//** |
| frank26080115 | 0:84d7747641aa | 161 | * @brief Clear Counter flag |
| frank26080115 | 0:84d7747641aa | 162 | * @param[in] None |
| frank26080115 | 0:84d7747641aa | 163 | * @return None |
| frank26080115 | 0:84d7747641aa | 164 | **********************************************************************/ |
| frank26080115 | 0:84d7747641aa | 165 | void SYSTICK_ClearCounterFlag(void) |
| frank26080115 | 0:84d7747641aa | 166 | { |
| frank26080115 | 0:84d7747641aa | 167 | SysTick->CTRL &= ~ST_CTRL_COUNTFLAG; |
| frank26080115 | 0:84d7747641aa | 168 | } |
| frank26080115 | 0:84d7747641aa | 169 | /** |
| frank26080115 | 0:84d7747641aa | 170 | * @} |
| frank26080115 | 0:84d7747641aa | 171 | */ |
| frank26080115 | 0:84d7747641aa | 172 | |
| frank26080115 | 0:84d7747641aa | 173 | #endif /* _SYSTICK */ |
| frank26080115 | 0:84d7747641aa | 174 | |
| frank26080115 | 0:84d7747641aa | 175 | /** |
| frank26080115 | 0:84d7747641aa | 176 | * @} |
| frank26080115 | 0:84d7747641aa | 177 | */ |
| frank26080115 | 0:84d7747641aa | 178 | |
| frank26080115 | 0:84d7747641aa | 179 | /* --------------------------------- End Of File ------------------------------ */ |
| frank26080115 | 0:84d7747641aa | 180 |