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355 lines
14 KiB
355 lines
14 KiB
//***************************************************************************** |
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// LPC84x Microcontroller Startup code for use with MCUXpresso IDE |
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// |
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// Version : 170111 |
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//***************************************************************************** |
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// |
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// Copyright(C) NXP Semiconductors, 2017 |
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// All rights reserved. |
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// |
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// Software that is described herein is for illustrative purposes only |
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// which provides customers with programming information regarding the |
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// LPC products. This software is supplied "AS IS" without any warranties of |
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// any kind, and NXP Semiconductors and its licensor disclaim any and |
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// all warranties, express or implied, including all implied warranties of |
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// merchantability, fitness for a particular purpose and non-infringement of |
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// intellectual property rights. NXP Semiconductors assumes no responsibility |
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// or liability for the use of the software, conveys no license or rights under any |
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// patent, copyright, mask work right, or any other intellectual property rights in |
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// or to any products. NXP Semiconductors reserves the right to make changes |
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// in the software without notification. NXP Semiconductors also makes no |
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// representation or warranty that such application will be suitable for the |
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// specified use without further testing or modification. |
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// |
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// Permission to use, copy, modify, and distribute this software and its |
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// documentation is hereby granted, under NXP Semiconductors' and its |
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// licensor's relevant copyrights in the software, without fee, provided that it |
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// is used in conjunction with NXP Semiconductors microcontrollers. This |
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// copyright, permission, and disclaimer notice must appear in all copies of |
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// this code. |
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//***************************************************************************** |
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#if defined (__cplusplus) |
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#ifdef __REDLIB__ |
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#error Redlib does not support C++ |
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#else |
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//***************************************************************************** |
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// |
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// The entry point for the C++ library startup |
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// |
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//***************************************************************************** |
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extern "C" { |
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extern void __libc_init_array(void); |
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} |
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#endif |
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#endif |
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#define WEAK __attribute__ ((weak)) |
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#define ALIAS(f) __attribute__ ((weak, alias (#f))) |
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//***************************************************************************** |
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#if defined (__cplusplus) |
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extern "C" { |
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#endif |
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//***************************************************************************** |
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#if defined (__USE_CMSIS) || defined (__USE_LPCOPEN) |
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// Declaration of external SystemInit function |
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extern void SystemInit(void); |
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#endif |
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//***************************************************************************** |
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// Patch the AEABI integer divide functions to use MCU's romdivide library |
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#ifdef __USE_ROMDIVIDE |
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// Location in memory that holds the address of the ROM Driver table |
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#define PTR_ROM_DRIVER_TABLE ((unsigned int *)(0x0F001FF8)) |
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// Variables to store addresses of idiv and udiv functions within MCU ROM |
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unsigned int *pDivRom_idiv; |
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unsigned int *pDivRom_uidiv; |
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#endif |
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//***************************************************************************** |
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// |
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// Forward declaration of the default handlers. These are aliased. |
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// When the application defines a handler (with the same name), this will |
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// automatically take precedence over these weak definitions |
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// |
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//***************************************************************************** |
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void ResetISR(void); |
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WEAK void NMI_Handler(void); |
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WEAK void HardFault_Handler(void); |
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WEAK void SVC_Handler(void); |
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WEAK void PendSV_Handler(void); |
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WEAK void SysTick_Handler(void); |
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WEAK void IntDefaultHandler(void); |
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//***************************************************************************** |
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// |
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// Forward declaration of the specific IRQ handlers. These are aliased |
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// to the IntDefaultHandler, which is a 'forever' loop. When the application |
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// defines a handler (with the same name), this will automatically take |
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// precedence over these weak definitions |
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// |
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//***************************************************************************** |
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void SPI0_IRQHandler(void) ALIAS(IntDefaultHandler); |
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void DAC0_IRQHandler(void) ALIAS(IntDefaultHandler); |
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void UART0_IRQHandler(void) ALIAS(IntDefaultHandler); |
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void UART1_IRQHandler(void) ALIAS(IntDefaultHandler); |
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void I2C1_IRQHandler(void) ALIAS(IntDefaultHandler); |
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void I2C0_IRQHandler(void) ALIAS(IntDefaultHandler); |
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void MRT_IRQHandler(void) ALIAS(IntDefaultHandler); |
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void CMP_IRQHandler(void) ALIAS(IntDefaultHandler); |
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void WDT_IRQHandler(void) ALIAS(IntDefaultHandler); |
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void BOD_IRQHandler(void) ALIAS(IntDefaultHandler); |
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void FLASH_IRQHandler(void) ALIAS(IntDefaultHandler); |
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void WKT_IRQHandler(void) ALIAS(IntDefaultHandler); |
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void ADC_SEQA_IRQHandler(void) ALIAS(IntDefaultHandler); |
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void ADC_SEQB_IRQHandler(void) ALIAS(IntDefaultHandler); |
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void ADC_THCMP_IRQHandler(void) ALIAS(IntDefaultHandler); |
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void ADC_OVR_IRQHandler(void) ALIAS(IntDefaultHandler); |
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void CTIMER0_IRQHandler(void) ALIAS(IntDefaultHandler); |
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void PININT0_IRQHandler(void) ALIAS(IntDefaultHandler); |
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void PININT1_IRQHandler(void) ALIAS(IntDefaultHandler); |
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void PININT2_IRQHandler(void) ALIAS(IntDefaultHandler); |
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void PININT3_IRQHandler(void) ALIAS(IntDefaultHandler); |
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void PININT4_IRQHandler(void) ALIAS(IntDefaultHandler); |
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void PININT5_IRQHandler(void) ALIAS(IntDefaultHandler); |
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void PININT6_IRQHandler(void) ALIAS(IntDefaultHandler); |
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void PININT7_IRQHandler(void) ALIAS(IntDefaultHandler); |
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//***************************************************************************** |
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// |
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// The entry point for the application. |
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// __main() is the entry point for Redlib based applications |
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// main() is the entry point for Newlib based applications |
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// |
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//***************************************************************************** |
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#if defined (__REDLIB__) |
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extern void __main(void); |
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#else |
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extern int main(void); |
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#endif |
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//***************************************************************************** |
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// |
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// External declaration for the pointer to the stack top from the Linker Script |
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// |
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//***************************************************************************** |
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extern void _vStackTop(void); |
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//***************************************************************************** |
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// |
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// External declaration for LPC MCU vector table checksum from Linker Script |
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// |
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//***************************************************************************** |
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WEAK extern void __valid_user_code_checksum(); |
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//***************************************************************************** |
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#if defined (__cplusplus) |
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} // extern "C" |
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#endif |
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//***************************************************************************** |
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// |
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// The vector table. |
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// This relies on the linker script to place at correct location in memory. |
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// |
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//***************************************************************************** |
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extern void (* const g_pfnVectors[])(void); |
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__attribute__ ((used,section(".isr_vector"))) |
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void (* const g_pfnVectors[])(void) = { |
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// Core Level - CM0plus |
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&_vStackTop, // The initial stack pointer |
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ResetISR, // The reset handler |
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NMI_Handler, // The NMI handler |
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HardFault_Handler, // The hard fault handler |
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0, // Reserved |
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0, // Reserved |
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0, // Reserved |
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__valid_user_code_checksum, // LPC MCU Checksum |
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0, // Reserved |
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0, // Reserved |
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0, // Reserved |
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SVC_Handler, // SVCall handler |
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0, // Reserved |
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0, // Reserved |
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PendSV_Handler, // The PendSV handler |
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SysTick_Handler, // The SysTick handler |
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// Chip Level - LPC80x |
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SPI0_IRQHandler, // 0 - SPI0 |
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0, // 1 - Reserved |
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DAC0_IRQHandler, // 2 - DAC0 |
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UART0_IRQHandler, // 3 - UART0 |
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UART1_IRQHandler, // 4 - UART1 |
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0, // 5 - Reserved |
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0, // 6 - Reserved |
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I2C1_IRQHandler, // 7 - I2C1 |
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I2C0_IRQHandler, // 8 - I2C0 |
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0, // 9 - Reserved |
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MRT_IRQHandler, // 10 - Multi-rate timer |
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CMP_IRQHandler, // 11 - Analog comparator / Cap Touch |
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WDT_IRQHandler, // 12 - Windowed watchdog timer |
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BOD_IRQHandler, // 13 - BOD |
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FLASH_IRQHandler, // 14 - FLASH |
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WKT_IRQHandler, // 15 - Self wake-up timer |
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ADC_SEQA_IRQHandler, // 16 - ADC seq A |
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ADC_SEQB_IRQHandler, // 17 - ADC_seq B |
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ADC_THCMP_IRQHandler, // 18 - ADC threshold compare |
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ADC_OVR_IRQHandler, // 19 - ADC overrun |
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0, // 20 - Reserved |
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0, // 21 - Reserved |
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0, // 22 - Reserved |
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CTIMER0_IRQHandler, // 23 - Timer 0 |
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PININT0_IRQHandler, // 24 - PININT0 |
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PININT1_IRQHandler, // 25 - PININT1 |
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PININT2_IRQHandler, // 26 - PININT2 |
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PININT3_IRQHandler, // 27 - PININT3 |
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PININT4_IRQHandler, // 28 - PININT4 |
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PININT5_IRQHandler, // 29 - PININT5 |
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PININT6_IRQHandler, // 30 - PININT6 |
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PININT7_IRQHandler // 31 - PININT7 |
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}; /* End of g_pfnVectors */ |
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//***************************************************************************** |
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// Functions to carry out the initialization of RW and BSS data sections. These |
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// are written as separate functions rather than being inlined within the |
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// ResetISR() function in order to cope with MCUs with multiple banks of |
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// memory. |
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//***************************************************************************** |
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__attribute__ ((section(".after_vectors"))) |
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void data_init(unsigned int romstart, unsigned int start, unsigned int len) { |
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unsigned int *pulDest = (unsigned int*) start; |
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unsigned int *pulSrc = (unsigned int*) romstart; |
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unsigned int loop; |
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for (loop = 0; loop < len; loop = loop + 4) |
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*pulDest++ = *pulSrc++; |
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} |
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__attribute__ ((section(".after_vectors"))) |
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void bss_init(unsigned int start, unsigned int len) { |
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unsigned int *pulDest = (unsigned int*) start; |
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unsigned int loop; |
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for (loop = 0; loop < len; loop = loop + 4) |
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*pulDest++ = 0; |
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} |
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//***************************************************************************** |
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// The following symbols are constructs generated by the linker, indicating |
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// the location of various points in the "Global Section Table". This table is |
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// created by the linker via the Code Red managed linker script mechanism. It |
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// contains the load address, execution address and length of each RW data |
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// section and the execution and length of each BSS (zero initialized) section. |
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//***************************************************************************** |
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extern unsigned int __data_section_table; |
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extern unsigned int __data_section_table_end; |
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extern unsigned int __bss_section_table; |
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extern unsigned int __bss_section_table_end; |
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//***************************************************************************** |
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// Reset entry point for your code. |
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// Sets up a simple runtime environment and initializes the C/C++ |
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// library. |
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//***************************************************************************** |
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__attribute__ ((section(".after_vectors"))) |
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void |
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ResetISR(void) { |
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// |
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// Copy the data sections from flash to SRAM. |
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// |
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unsigned int LoadAddr, ExeAddr, SectionLen; |
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unsigned int *SectionTableAddr; |
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// Load base address of Global Section Table |
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SectionTableAddr = &__data_section_table; |
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// Copy the data sections from flash to SRAM. |
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while (SectionTableAddr < &__data_section_table_end) { |
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LoadAddr = *SectionTableAddr++; |
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ExeAddr = *SectionTableAddr++; |
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SectionLen = *SectionTableAddr++; |
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data_init(LoadAddr, ExeAddr, SectionLen); |
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} |
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// At this point, SectionTableAddr = &__bss_section_table; |
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// Zero fill the bss segment |
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while (SectionTableAddr < &__bss_section_table_end) { |
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ExeAddr = *SectionTableAddr++; |
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SectionLen = *SectionTableAddr++; |
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bss_init(ExeAddr, SectionLen); |
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} |
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// Patch the AEABI integer divide functions to use MCU's romdivide library |
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#ifdef __USE_ROMDIVIDE |
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// Get address of Integer division routines function table in ROM |
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unsigned int *div_ptr = (unsigned int *)((unsigned int *)*(PTR_ROM_DRIVER_TABLE))[4]; |
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// Get addresses of integer divide routines in ROM |
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// These address are then used by the code in aeabi_romdiv_patch.s |
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pDivRom_idiv = (unsigned int *)div_ptr[0]; |
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pDivRom_uidiv = (unsigned int *)div_ptr[1]; |
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#endif |
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#if defined (__USE_CMSIS) || defined (__USE_LPCOPEN) |
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SystemInit(); |
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#endif |
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#if defined (__cplusplus) |
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// |
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// Call C++ library initialisation |
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// |
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__libc_init_array(); |
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#endif |
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#if defined (__REDLIB__) |
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// Call the Redlib library, which in turn calls main() |
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__main() ; |
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#else |
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main(); |
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#endif |
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// |
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// main() shouldn't return, but if it does, we'll just enter an infinite loop |
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// |
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while (1) { |
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; |
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} |
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} |
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//***************************************************************************** |
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// Default exception handlers. Override the ones here by defining your own |
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// handler routines in your application code. |
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//***************************************************************************** |
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__attribute__ ((section(".after_vectors"))) |
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void NMI_Handler(void) |
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{ while(1) {} |
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} |
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__attribute__ ((section(".after_vectors"))) |
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void HardFault_Handler(void) |
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{ while(1) {} |
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} |
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__attribute__ ((section(".after_vectors"))) |
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void SVC_Handler(void) |
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{ while(1) {} |
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} |
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__attribute__ ((section(".after_vectors"))) |
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void PendSV_Handler(void) |
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{ while(1) {} |
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} |
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__attribute__ ((section(".after_vectors"))) |
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void SysTick_Handler(void) |
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{ while(1) {} |
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} |
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//***************************************************************************** |
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// |
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// Processor ends up here if an unexpected interrupt occurs or a specific |
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// handler is not present in the application code. |
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// |
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//***************************************************************************** |
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__attribute__ ((section(".after_vectors"))) |
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void IntDefaultHandler(void) |
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{ while(1) {} |
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}
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