/* Teensyduino Core Library * http://www.pjrc.com/teensy/ * Copyright (c) 2013 PJRC.COM, LLC. * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * 1. The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * 2. If the Software is incorporated into a build system that allows * selection among a list of target devices, then similar target * devices manufactured by PJRC.COM must be included in the list of * target devices and selectable in the same manner. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ #include "mk20dx128.h" extern unsigned long _stext; extern unsigned long _etext; extern unsigned long _sdata; extern unsigned long _edata; extern unsigned long _sbss; extern unsigned long _ebss; extern unsigned long _estack; //extern void __init_array_start(void); //extern void __init_array_end(void); extern int main (void); void ResetHandler(void); void _init_Teensyduino_internal_(void); void __libc_init_array(void); void fault_isr(void) { while (1) { // keep polling some communication while in fault // mode, so we don't completely die. if (SIM_SCGC4 & SIM_SCGC4_USBOTG) usb_isr(); if (SIM_SCGC4 & SIM_SCGC4_UART0) uart0_status_isr(); if (SIM_SCGC4 & SIM_SCGC4_UART1) uart1_status_isr(); if (SIM_SCGC4 & SIM_SCGC4_UART2) uart2_status_isr(); } } void unused_isr(void) { fault_isr(); } extern volatile uint32_t systick_millis_count; void systick_default_isr(void) { systick_millis_count++; } void nmi_isr(void) __attribute__ ((weak, alias("unused_isr"))); void hard_fault_isr(void) __attribute__ ((weak, alias("unused_isr"))); void memmanage_fault_isr(void) __attribute__ ((weak, alias("unused_isr"))); void bus_fault_isr(void) __attribute__ ((weak, alias("unused_isr"))); void usage_fault_isr(void) __attribute__ ((weak, alias("unused_isr"))); void svcall_isr(void) __attribute__ ((weak, alias("unused_isr"))); void debugmonitor_isr(void) __attribute__ ((weak, alias("unused_isr"))); void pendablesrvreq_isr(void) __attribute__ ((weak, alias("unused_isr"))); void systick_isr(void) __attribute__ ((weak, alias("systick_default_isr"))); void dma_ch0_isr(void) __attribute__ ((weak, alias("unused_isr"))); void dma_ch1_isr(void) __attribute__ ((weak, alias("unused_isr"))); void dma_ch2_isr(void) __attribute__ ((weak, alias("unused_isr"))); void dma_ch3_isr(void) __attribute__ ((weak, alias("unused_isr"))); void dma_ch4_isr(void) __attribute__ ((weak, alias("unused_isr"))); void dma_ch5_isr(void) __attribute__ ((weak, alias("unused_isr"))); void dma_ch6_isr(void) __attribute__ ((weak, alias("unused_isr"))); void dma_ch7_isr(void) __attribute__ ((weak, alias("unused_isr"))); void dma_ch8_isr(void) __attribute__ ((weak, alias("unused_isr"))); void dma_ch9_isr(void) __attribute__ ((weak, alias("unused_isr"))); void dma_ch10_isr(void) __attribute__ ((weak, alias("unused_isr"))); void dma_ch11_isr(void) __attribute__ ((weak, alias("unused_isr"))); void dma_ch12_isr(void) __attribute__ ((weak, alias("unused_isr"))); void dma_ch13_isr(void) __attribute__ ((weak, alias("unused_isr"))); void dma_ch14_isr(void) __attribute__ ((weak, alias("unused_isr"))); void dma_ch15_isr(void) __attribute__ ((weak, alias("unused_isr"))); void dma_error_isr(void) __attribute__ ((weak, alias("unused_isr"))); void mcm_isr(void) __attribute__ ((weak, alias("unused_isr"))); void flash_cmd_isr(void) __attribute__ ((weak, alias("unused_isr"))); void flash_error_isr(void) __attribute__ ((weak, alias("unused_isr"))); void low_voltage_isr(void) __attribute__ ((weak, alias("unused_isr"))); void wakeup_isr(void) __attribute__ ((weak, alias("unused_isr"))); void watchdog_isr(void) __attribute__ ((weak, alias("unused_isr"))); void i2c0_isr(void) __attribute__ ((weak, alias("unused_isr"))); void i2c1_isr(void) __attribute__ ((weak, alias("unused_isr"))); void i2c2_isr(void) __attribute__ ((weak, alias("unused_isr"))); void spi0_isr(void) __attribute__ ((weak, alias("unused_isr"))); void spi1_isr(void) __attribute__ ((weak, alias("unused_isr"))); void spi2_isr(void) __attribute__ ((weak, alias("unused_isr"))); void sdhc_isr(void) __attribute__ ((weak, alias("unused_isr"))); void can0_message_isr(void) __attribute__ ((weak, alias("unused_isr"))); void can0_bus_off_isr(void) __attribute__ ((weak, alias("unused_isr"))); void can0_error_isr(void) __attribute__ ((weak, alias("unused_isr"))); void can0_tx_warn_isr(void) __attribute__ ((weak, alias("unused_isr"))); void can0_rx_warn_isr(void) __attribute__ ((weak, alias("unused_isr"))); void can0_wakeup_isr(void) __attribute__ ((weak, alias("unused_isr"))); void i2s0_tx_isr(void) __attribute__ ((weak, alias("unused_isr"))); void i2s0_rx_isr(void) __attribute__ ((weak, alias("unused_isr"))); void uart0_lon_isr(void) __attribute__ ((weak, alias("unused_isr"))); void uart0_status_isr(void) __attribute__ ((weak, alias("unused_isr"))); void uart0_error_isr(void) __attribute__ ((weak, alias("unused_isr"))); void uart1_status_isr(void) __attribute__ ((weak, alias("unused_isr"))); void uart1_error_isr(void) __attribute__ ((weak, alias("unused_isr"))); void uart2_status_isr(void) __attribute__ ((weak, alias("unused_isr"))); void uart2_error_isr(void) __attribute__ ((weak, alias("unused_isr"))); void uart3_status_isr(void) __attribute__ ((weak, alias("unused_isr"))); void uart3_error_isr(void) __attribute__ ((weak, alias("unused_isr"))); void uart4_status_isr(void) __attribute__ ((weak, alias("unused_isr"))); void uart4_error_isr(void) __attribute__ ((weak, alias("unused_isr"))); void uart5_status_isr(void) __attribute__ ((weak, alias("unused_isr"))); void uart5_error_isr(void) __attribute__ ((weak, alias("unused_isr"))); void adc0_isr(void) __attribute__ ((weak, alias("unused_isr"))); void adc1_isr(void) __attribute__ ((weak, alias("unused_isr"))); void cmp0_isr(void) __attribute__ ((weak, alias("unused_isr"))); void cmp1_isr(void) __attribute__ ((weak, alias("unused_isr"))); void cmp2_isr(void) __attribute__ ((weak, alias("unused_isr"))); void ftm0_isr(void) __attribute__ ((weak, alias("unused_isr"))); void ftm1_isr(void) __attribute__ ((weak, alias("unused_isr"))); void ftm2_isr(void) __attribute__ ((weak, alias("unused_isr"))); void ftm3_isr(void) __attribute__ ((weak, alias("unused_isr"))); void cmt_isr(void) __attribute__ ((weak, alias("unused_isr"))); void rtc_alarm_isr(void) __attribute__ ((weak, alias("unused_isr"))); void rtc_seconds_isr(void) __attribute__ ((weak, alias("unused_isr"))); void pit0_isr(void) __attribute__ ((weak, alias("unused_isr"))); void pit1_isr(void) __attribute__ ((weak, alias("unused_isr"))); void pit2_isr(void) __attribute__ ((weak, alias("unused_isr"))); void pit3_isr(void) __attribute__ ((weak, alias("unused_isr"))); void pdb_isr(void) __attribute__ ((weak, alias("unused_isr"))); void usb_isr(void) __attribute__ ((weak, alias("unused_isr"))); void usb_charge_isr(void) __attribute__ ((weak, alias("unused_isr"))); void dac0_isr(void) __attribute__ ((weak, alias("unused_isr"))); void dac1_isr(void) __attribute__ ((weak, alias("unused_isr"))); void tsi0_isr(void) __attribute__ ((weak, alias("unused_isr"))); void mcg_isr(void) __attribute__ ((weak, alias("unused_isr"))); void lptmr_isr(void) __attribute__ ((weak, alias("unused_isr"))); void porta_isr(void) __attribute__ ((weak, alias("unused_isr"))); void portb_isr(void) __attribute__ ((weak, alias("unused_isr"))); void portc_isr(void) __attribute__ ((weak, alias("unused_isr"))); void portd_isr(void) __attribute__ ((weak, alias("unused_isr"))); void porte_isr(void) __attribute__ ((weak, alias("unused_isr"))); void software_isr(void) __attribute__ ((weak, alias("unused_isr"))); // TODO: create AVR-stype ISR() macro, with default linkage to undefined handler // __attribute__ ((section(".vectors"), used)) void (* const gVectors[])(void) = { (void (*)(void))((unsigned long)&_estack), // 0 ARM: Initial Stack Pointer ResetHandler, // 1 ARM: Initial Program Counter nmi_isr, // 2 ARM: Non-maskable Interrupt (NMI) hard_fault_isr, // 3 ARM: Hard Fault memmanage_fault_isr, // 4 ARM: MemManage Fault bus_fault_isr, // 5 ARM: Bus Fault usage_fault_isr, // 6 ARM: Usage Fault fault_isr, // 7 -- fault_isr, // 8 -- fault_isr, // 9 -- fault_isr, // 10 -- svcall_isr, // 11 ARM: Supervisor call (SVCall) debugmonitor_isr, // 12 ARM: Debug Monitor fault_isr, // 13 -- pendablesrvreq_isr, // 14 ARM: Pendable req serv(PendableSrvReq) systick_isr, // 15 ARM: System tick timer (SysTick) #if defined(_mk20dx128_) dma_ch0_isr, // 16 DMA channel 0 transfer complete dma_ch1_isr, // 17 DMA channel 1 transfer complete dma_ch2_isr, // 18 DMA channel 2 transfer complete dma_ch3_isr, // 19 DMA channel 3 transfer complete dma_error_isr, // 20 DMA error interrupt channel unused_isr, // 21 DMA -- flash_cmd_isr, // 22 Flash Memory Command complete flash_error_isr, // 23 Flash Read collision low_voltage_isr, // 24 Low-voltage detect/warning wakeup_isr, // 25 Low Leakage Wakeup watchdog_isr, // 26 Both EWM and WDOG interrupt i2c0_isr, // 27 I2C0 spi0_isr, // 28 SPI0 i2s0_tx_isr, // 29 I2S0 Transmit i2s0_rx_isr, // 30 I2S0 Receive uart0_lon_isr, // 31 UART0 CEA709.1-B (LON) status uart0_status_isr, // 32 UART0 status uart0_error_isr, // 33 UART0 error uart1_status_isr, // 34 UART1 status uart1_error_isr, // 35 UART1 error uart2_status_isr, // 36 UART2 status uart2_error_isr, // 37 UART2 error adc0_isr, // 38 ADC0 cmp0_isr, // 39 CMP0 cmp1_isr, // 40 CMP1 ftm0_isr, // 41 FTM0 ftm1_isr, // 42 FTM1 cmt_isr, // 43 CMT rtc_alarm_isr, // 44 RTC Alarm interrupt rtc_seconds_isr, // 45 RTC Seconds interrupt pit0_isr, // 46 PIT Channel 0 pit1_isr, // 47 PIT Channel 1 pit2_isr, // 48 PIT Channel 2 pit3_isr, // 49 PIT Channel 3 pdb_isr, // 50 PDB Programmable Delay Block usb_isr, // 51 USB OTG usb_charge_isr, // 52 USB Charger Detect tsi0_isr, // 53 TSI0 mcg_isr, // 54 MCG lptmr_isr, // 55 Low Power Timer porta_isr, // 56 Pin detect (Port A) portb_isr, // 57 Pin detect (Port B) portc_isr, // 58 Pin detect (Port C) portd_isr, // 59 Pin detect (Port D) porte_isr, // 60 Pin detect (Port E) software_isr, // 61 Software interrupt #elif defined(_mk20dx256_) dma_ch0_isr, // 16 DMA channel 0 transfer complete dma_ch1_isr, // 17 DMA channel 1 transfer complete dma_ch2_isr, // 18 DMA channel 2 transfer complete dma_ch3_isr, // 19 DMA channel 3 transfer complete dma_ch4_isr, // 20 DMA channel 4 transfer complete dma_ch5_isr, // 21 DMA channel 5 transfer complete dma_ch6_isr, // 22 DMA channel 6 transfer complete dma_ch7_isr, // 23 DMA channel 7 transfer complete dma_ch8_isr, // 24 DMA channel 8 transfer complete dma_ch9_isr, // 25 DMA channel 9 transfer complete dma_ch10_isr, // 26 DMA channel 10 transfer complete dma_ch11_isr, // 27 DMA channel 10 transfer complete dma_ch12_isr, // 28 DMA channel 10 transfer complete dma_ch13_isr, // 29 DMA channel 10 transfer complete dma_ch14_isr, // 30 DMA channel 10 transfer complete dma_ch15_isr, // 31 DMA channel 10 transfer complete dma_error_isr, // 32 DMA error interrupt channel unused_isr, // 33 -- flash_cmd_isr, // 34 Flash Memory Command complete flash_error_isr, // 35 Flash Read collision low_voltage_isr, // 36 Low-voltage detect/warning wakeup_isr, // 37 Low Leakage Wakeup watchdog_isr, // 38 Both EWM and WDOG interrupt unused_isr, // 39 -- i2c0_isr, // 40 I2C0 i2c1_isr, // 41 I2C1 spi0_isr, // 42 SPI0 spi1_isr, // 43 SPI1 unused_isr, // 44 -- can0_message_isr, // 45 CAN OR'ed Message buffer (0-15) can0_bus_off_isr, // 46 CAN Bus Off can0_error_isr, // 47 CAN Error can0_tx_warn_isr, // 48 CAN Transmit Warning can0_rx_warn_isr, // 49 CAN Receive Warning can0_wakeup_isr, // 50 CAN Wake Up i2s0_tx_isr, // 51 I2S0 Transmit i2s0_rx_isr, // 52 I2S0 Receive unused_isr, // 53 -- unused_isr, // 54 -- unused_isr, // 55 -- unused_isr, // 56 -- unused_isr, // 57 -- unused_isr, // 58 -- unused_isr, // 59 -- uart0_lon_isr, // 60 UART0 CEA709.1-B (LON) status uart0_status_isr, // 61 UART0 status uart0_error_isr, // 62 UART0 error uart1_status_isr, // 63 UART1 status uart1_error_isr, // 64 UART1 error uart2_status_isr, // 65 UART2 status uart2_error_isr, // 66 UART2 error unused_isr, // 67 -- unused_isr, // 68 -- unused_isr, // 69 -- unused_isr, // 70 -- unused_isr, // 71 -- unused_isr, // 72 -- adc0_isr, // 73 ADC0 adc1_isr, // 74 ADC1 cmp0_isr, // 75 CMP0 cmp1_isr, // 76 CMP1 cmp2_isr, // 77 CMP2 ftm0_isr, // 78 FTM0 ftm1_isr, // 79 FTM1 ftm2_isr, // 80 FTM2 cmt_isr, // 81 CMT rtc_alarm_isr, // 82 RTC Alarm interrupt rtc_seconds_isr, // 83 RTC Seconds interrupt pit0_isr, // 84 PIT Channel 0 pit1_isr, // 85 PIT Channel 1 pit2_isr, // 86 PIT Channel 2 pit3_isr, // 87 PIT Channel 3 pdb_isr, // 88 PDB Programmable Delay Block usb_isr, // 89 USB OTG usb_charge_isr, // 90 USB Charger Detect unused_isr, // 91 -- unused_isr, // 92 -- unused_isr, // 93 -- unused_isr, // 94 -- unused_isr, // 95 -- unused_isr, // 96 -- dac0_isr, // 97 DAC0 unused_isr, // 98 -- tsi0_isr, // 99 TSI0 mcg_isr, // 100 MCG lptmr_isr, // 101 Low Power Timer unused_isr, // 102 -- porta_isr, // 103 Pin detect (Port A) portb_isr, // 104 Pin detect (Port B) portc_isr, // 105 Pin detect (Port C) portd_isr, // 106 Pin detect (Port D) porte_isr, // 107 Pin detect (Port E) unused_isr, // 108 -- unused_isr, // 109 -- software_isr, // 110 Software interrupt #endif }; //void usb_isr(void) //{ //} __attribute__ ((section(".flashconfig"), used)) const uint8_t flashconfigbytes[16] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFE, 0xFF, 0xFF, 0xFF }; // Automatically initialize the RTC. When the build defines the compile // time, and the user has added a crystal, the RTC will automatically // begin at the time of the first upload. #ifndef TIME_T #define TIME_T 1349049600 // default 1 Oct 2012 (never used, Arduino sets this) #endif extern void rtc_set(unsigned long t); static void startup_unused_hook(void) {} void startup_early_hook(void) __attribute__ ((weak, alias("startup_unused_hook"))); void startup_late_hook(void) __attribute__ ((weak, alias("startup_unused_hook"))); __attribute__ ((section(".startup"))) void ResetHandler(void) { uint32_t *src = &_etext; uint32_t *dest = &_sdata; unsigned int i; WDOG_UNLOCK = WDOG_UNLOCK_SEQ1; WDOG_UNLOCK = WDOG_UNLOCK_SEQ2; WDOG_STCTRLH = WDOG_STCTRLH_ALLOWUPDATE; startup_early_hook(); // enable clocks to always-used peripherals #if defined(_mk20dx128_) SIM_SCGC5 = 0x00043F82; // clocks active to all GPIO SIM_SCGC6 = SIM_SCGC6_RTC | SIM_SCGC6_FTM0 | SIM_SCGC6_FTM1 | SIM_SCGC6_ADC0 | SIM_SCGC6_FTFL; #elif defined(_mk20dx256_) SIM_SCGC3 = SIM_SCGC3_ADC1 | SIM_SCGC3_FTM2; SIM_SCGC5 = 0x00043F82; // clocks active to all GPIO SIM_SCGC6 = SIM_SCGC6_RTC | SIM_SCGC6_FTM0 | SIM_SCGC6_FTM1 | SIM_SCGC6_ADC0 | SIM_SCGC6_FTFL; #endif // if the RTC oscillator isn't enabled, get it started early if (!(RTC_CR & RTC_CR_OSCE)) { RTC_SR = 0; RTC_CR = RTC_CR_SC16P | RTC_CR_SC4P | RTC_CR_OSCE; } // release I/O pins hold, if we woke up from VLLS mode if (PMC_REGSC & PMC_REGSC_ACKISO) PMC_REGSC |= PMC_REGSC_ACKISO; // TODO: do this while the PLL is waiting to lock.... while (dest < &_edata) *dest++ = *src++; dest = &_sbss; while (dest < &_ebss) *dest++ = 0; SCB_VTOR = 0; // use vector table in flash // default all interrupts to medium priority level for (i=0; i < NVIC_NUM_INTERRUPTS; i++) NVIC_SET_PRIORITY(i, 128); // start in FEI mode // enable capacitors for crystal OSC0_CR = OSC_SC8P | OSC_SC2P; // enable osc, 8-32 MHz range, low power mode MCG_C2 = MCG_C2_RANGE0(2) | MCG_C2_EREFS; // switch to crystal as clock source, FLL input = 16 MHz / 512 MCG_C1 = MCG_C1_CLKS(2) | MCG_C1_FRDIV(4); // wait for crystal oscillator to begin while ((MCG_S & MCG_S_OSCINIT0) == 0) ; // wait for FLL to use oscillator while ((MCG_S & MCG_S_IREFST) != 0) ; // wait for MCGOUT to use oscillator while ((MCG_S & MCG_S_CLKST_MASK) != MCG_S_CLKST(2)) ; // now we're in FBE mode // config PLL input for 16 MHz Crystal / 4 = 4 MHz MCG_C5 = MCG_C5_PRDIV0(3); // config PLL for 96 MHz output MCG_C6 = MCG_C6_PLLS | MCG_C6_VDIV0(0); // wait for PLL to start using xtal as its input while (!(MCG_S & MCG_S_PLLST)) ; // wait for PLL to lock while (!(MCG_S & MCG_S_LOCK0)) ; // now we're in PBE mode #if F_CPU == 96000000 // config divisors: 96 MHz core, 48 MHz bus, 24 MHz flash SIM_CLKDIV1 = SIM_CLKDIV1_OUTDIV1(0) | SIM_CLKDIV1_OUTDIV2(1) | SIM_CLKDIV1_OUTDIV4(3); #elif F_CPU == 48000000 // config divisors: 48 MHz core, 48 MHz bus, 24 MHz flash SIM_CLKDIV1 = SIM_CLKDIV1_OUTDIV1(1) | SIM_CLKDIV1_OUTDIV2(1) | SIM_CLKDIV1_OUTDIV4(3); #elif F_CPU == 24000000 // config divisors: 24 MHz core, 24 MHz bus, 24 MHz flash SIM_CLKDIV1 = SIM_CLKDIV1_OUTDIV1(3) | SIM_CLKDIV1_OUTDIV2(3) | SIM_CLKDIV1_OUTDIV4(3); #else #error "Error, F_CPU must be 96000000, 48000000, or 24000000" #endif // switch to PLL as clock source, FLL input = 16 MHz / 512 MCG_C1 = MCG_C1_CLKS(0) | MCG_C1_FRDIV(4); // wait for PLL clock to be used while ((MCG_S & MCG_S_CLKST_MASK) != MCG_S_CLKST(3)) ; // now we're in PEE mode // configure USB for 48 MHz clock SIM_CLKDIV2 = SIM_CLKDIV2_USBDIV(1); // USB = 96 MHz PLL / 2 // USB uses PLL clock, trace is CPU clock, CLKOUT=OSCERCLK0 SIM_SOPT2 = SIM_SOPT2_USBSRC | SIM_SOPT2_PLLFLLSEL | SIM_SOPT2_TRACECLKSEL | SIM_SOPT2_CLKOUTSEL(6); // initialize the SysTick counter SYST_RVR = (F_CPU / 1000) - 1; SYST_CSR = SYST_CSR_CLKSOURCE | SYST_CSR_TICKINT | SYST_CSR_ENABLE; //init_pins(); __enable_irq(); //_init_Teensyduino_internal_(); XXX HaaTa - Why is this here? Perhaps fixed in a new version of the API? //if (RTC_SR & RTC_SR_TIF) rtc_set(TIME_T); XXX HaaTa - We don't care about the rtc __libc_init_array(); /* for (ptr = &__init_array_start; ptr < &__init_array_end; ptr++) { (*ptr)(); } */ startup_late_hook(); main(); while (1) ; } // TODO: is this needed for c++ and where does it come from? /* void _init(void) { } */ char *__brkval = (char *)&_ebss; void * _sbrk(int incr) { //static char *heap_end = (char *)&_ebss; //char *prev = heap_end; //heap_end += incr; char *prev = __brkval; __brkval += incr; return prev; } __attribute__((weak)) int _read(int file, char *ptr, int len) { return 0; } /* moved to Print.cpp, to support Print::printf() __attribute__((weak)) int _write(int file, char *ptr, int len) { return 0; } */ __attribute__((weak)) int _close(int fd) { return -1; } #include __attribute__((weak)) int _fstat(int fd, struct stat *st) { st->st_mode = S_IFCHR; return 0; } __attribute__((weak)) int _isatty(int fd) { return 1; } __attribute__((weak)) int _lseek(int fd, long long offset, int whence) { return -1; } __attribute__((weak)) void _exit(int status) { while (1); } __attribute__((weak)) void __cxa_pure_virtual() { while (1); } __attribute__((weak)) int __cxa_guard_acquire (int *g) { return 1; } __attribute__((weak)) void __cxa_guard_release(int *g) { } int nvic_execution_priority(void) { int priority=256; uint32_t primask, faultmask, basepri, ipsr; // full algorithm in ARM DDI0403D, page B1-639 // this isn't quite complete, but hopefully good enough asm volatile("mrs %0, faultmask\n" : "=r" (faultmask)::); if (faultmask) return -1; asm volatile("mrs %0, primask\n" : "=r" (primask)::); if (primask) return 0; asm volatile("mrs %0, ipsr\n" : "=r" (ipsr)::); if (ipsr) { if (ipsr < 16) priority = 0; // could be non-zero else priority = NVIC_GET_PRIORITY(ipsr - 16); } asm volatile("mrs %0, basepri\n" : "=r" (basepri)::); if (basepri > 0 && basepri < priority) priority = basepri; return priority; }