211 lines
8.6 KiB
C
211 lines
8.6 KiB
C
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/*
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Include LPC11U3x Chip Library
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The chip library can be downloaded from LPCOpen
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and is included in the file
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lpcopen_v2_03_lpcxpresso_nxp_lpcxpresso_11u37h.zip
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*/
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#include <chip.h>
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#define SYS_CORE_CLOCK 12000000UL
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#define SYS_TICK_PERIOD_IN_MS 100
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/*=======================================================================*/
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/* system procedures and sys tick master task */
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volatile uint32_t sys_tick_irq_cnt=0;
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void __attribute__ ((interrupt)) SysTick_Handler(void)
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{
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sys_tick_irq_cnt++;
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}
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/*
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setup the hardware and start interrupts.
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called by "Reset_Handler"
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*/
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int __attribute__ ((noinline)) main(void)
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{
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/* set systick and start systick interrupt */
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SysTick_Config(SYS_CORE_CLOCK/1000UL*(unsigned long)SYS_TICK_PERIOD_IN_MS);
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/* turn on GPIO */
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Chip_GPIO_Init(LPC_GPIO);
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/* turn on IOCON */
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Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_IOCON);
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Chip_GPIO_SetPinDIROutput(LPC_GPIO, 0, 7); /* port 0, pin 7: LED on eHaJo Breakout Board */
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for(;;)
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{
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uint32_t t;
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Chip_GPIO_SetPinOutHigh(LPC_GPIO, 0, 7);
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t = sys_tick_irq_cnt;
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while( sys_tick_irq_cnt == t )
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;
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Chip_GPIO_SetPinOutLow(LPC_GPIO, 0, 7);
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t = sys_tick_irq_cnt;
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while( sys_tick_irq_cnt == t )
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;
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}
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/* enter sleep mode: Reduce from 1.4mA to 0.8mA with 12MHz */
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while (1)
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{
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SCB->SCR |= (1UL << SCB_SCR_SLEEPONEXIT_Pos); /* enter sleep mode after interrupt */
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Chip_PMU_SleepState(LPC_PMU); /* enter sleep mode now */
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}
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}
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/*=======================================================================*/
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/*
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Reserve some space for the stack. This is used to check if global variables + stack exceed RAM size.
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If -Wl,--gc-sections is used, then also define -Wl,--undefined=arm_stack_area to keep the variable in RAM.
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The name of the variable (here: arm_stack_area) does not matter.
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Heap (=dynamic memory allocation) is not supported
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*/
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#ifndef __STACK_SIZE
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#define __STACK_SIZE 0x100
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#endif
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unsigned char arm_stack_area[__STACK_SIZE] __attribute__ ((section(".stack"))) __attribute__ ((aligned(8)));
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/*=======================================================================*/
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/* isr system procedures */
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/* make the top of the stack known to the c compiler, value will be calculated by the linker script */
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void __StackTop(void);
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void __attribute__ ((interrupt)) __attribute__ ((noreturn)) Reset_Handler(void)
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{
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register unsigned long *ptr;
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register unsigned long *start;
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register unsigned long *end;
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/*
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Loop to copy data from read only memory to RAM. The ranges
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of copy from/to are specified by following symbols evaluated in
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linker script.
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__etext: End of code section, i.e., begin of data sections to copy from.
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__data_start__/__data_end__: RAM address range that data should be
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copied to. Both must be aligned to 4 bytes boundary.
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*/
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extern unsigned long __data_start__[];
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extern unsigned long __data_end__[];
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extern unsigned long __etext[];
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ptr = __etext;
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start = __data_start__;
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end = __data_end__;
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while( start < end )
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{
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*start = *ptr;
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start++;
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ptr++;
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}
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/*
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Loop to zero out BSS section, which uses following symbols
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in linker script:
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__bss_start__: start of BSS section. Must align to 4
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__bss_end__: end of BSS section. Must align to 4
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*/
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extern unsigned long __bss_start__[];
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extern unsigned long __bss_end__[];
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ptr = __bss_start__;
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end = __bss_end__;
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while( ptr < end )
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{
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*ptr = 0;
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ptr++;
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}
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/* Call main procedure */
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main();
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/* finished, do nothing. */
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for(;;)
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;
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}
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/* "NMI_Handler" is used in the ld script to calculate the checksum */
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void __attribute__ ((interrupt)) NMI_Handler(void)
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{
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}
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/* "HardFault_Handler" is used in the ld script to calculate the checksum */
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void __attribute__ ((interrupt)) HardFault_Handler(void)
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{
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}
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/* make the checksum known to the c compiler, value will be calculated by the linker script */
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void LPC_checksum(void);
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/*=======================================================================*/
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/* isr vector */
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/* see page 445 of the LPC11U3x user manual */
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/* see also enum LPC11UXX_IRQn in isr/cmsis_11uxx.h */
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typedef void (*isr_handler_t)(void);
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isr_handler_t __isr_vector[48] __attribute__ ((section(".isr_vector"))) __attribute__ ((aligned(4)))=
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{
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__StackTop, /* 0x00: Top of Stack, calculated by the linker script */
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Reset_Handler, /* 0x04: Reset Handler, DO NOT CHANGE THE ISR NAME (used for LPC_checksum calculation) */
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NMI_Handler, /* 0x08: NMI Handler, DO NOT CHANGE THE ISR NAME (used for LPC_checksum calculation) */
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HardFault_Handler, /* 0x0c: Hard Fault Handler, DO NOT CHANGE THE ISR NAME (used for LPC_checksum calculation) */
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0, /* 0x10: Reserved, must be 0 */
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0, /* 0x14: Reserved, must be 0 */
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0, /* 0x18: Reserved, must be 0 */
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LPC_checksum, /* 0x1c: Checksum, calculated by the linker script or the flash utility */
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0, /* Reserved */
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0, /* Reserved */
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0, /* Reserved */
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0, /* SVCall Handler */
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0, /* Reserved */
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0, /* Reserved */
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0, /* PendSV Handler */
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SysTick_Handler, /* SysTick Handler */
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0, /* PIN_INT0_IRQn = 0, Pin Interrupt 0 */
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0, /* PIN_INT1_IRQn = 1, Pin Interrupt 1 */
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0, /* PIN_INT2_IRQn = 2, Pin Interrupt 2 */
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0, /* PIN_INT3_IRQn = 3, Pin Interrupt 3 */
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0, /* PIN_INT4_IRQn = 4, Pin Interrupt 4 */
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0, /* PIN_INT5_IRQn = 5, Pin Interrupt 5 */
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0, /* PIN_INT6_IRQn = 6, Pin Interrupt 6 */
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0, /* PIN_INT7_IRQn = 7, Pin Interrupt 7 */
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0, /* GINT0_IRQn = 8, GPIO GROUP 0 interrupt */
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0, /* GINT1_IRQn = 9, GPIO GROUP 1 interrupt */
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0, /* Reserved10_IRQn = 10, Reserved Interrupt */
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0, /* Reserved11_IRQn = 11, */
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0, /* Reserved12_IRQn = 12, */
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0, /* Reserved13_IRQn = 13, */
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0, /* SSP1_IRQn = 14, SSP1 Interrupt */
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0, /* I2C0_IRQn = 15, I2C Interrupt */
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0, /* TIMER_16_0_IRQn = 16, 16-bit Timer0 Interrupt */
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0, /* TIMER_16_1_IRQn = 17, 16-bit Timer1 Interrupt */
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0, /* TIMER_32_0_IRQn = 18, 32-bit Timer0 Interrupt */
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0, /* TIMER_32_1_IRQn = 19, 32-bit Timer1 Interrupt */
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0, /* SSP0_IRQn = 20, SSP0 Interrupt */
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0, /* UART0_IRQn = 21, UART Interrupt */
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0, /* USB0_IRQn = 22, USB IRQ interrupt */
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0, /* USB0_FIQ_IRQn = 23, USB FIQ interrupt */
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0, /* ADC_IRQn = 24, A/D Converter Interrupt */
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0, /* WDT_IRQn = 25, Watchdog timer Interrupt */
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0, /* BOD_IRQn = 26, Brown Out Detect(BOD) Interrupt */
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0, /* FMC_IRQn = 27, Flash Memory Controller Interrupt */
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0, /* RESERVED28_IRQn = 28, */
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0, /* RESERVED29_IRQn = 29, */
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0, /* USB_WAKEUP_IRQn = 30, USB wake-up interrupt Interrupt */
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0 /* IOH_IRQn = 31, I/O Handler IRQ (Only for LPC11U37) */
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};
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