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Diffstat (limited to 'teensy/core/mk20dx128.c')
| -rw-r--r-- | teensy/core/mk20dx128.c | 662 |
1 files changed, 662 insertions, 0 deletions
diff --git a/teensy/core/mk20dx128.c b/teensy/core/mk20dx128.c new file mode 100644 index 000000000..0f5f1e19e --- /dev/null +++ b/teensy/core/mk20dx128.c @@ -0,0 +1,662 @@ +/* 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_default_early_hook(void) { WDOG_STCTRLH = WDOG_STCTRLH_ALLOWUPDATE; } +static void startup_default_late_hook(void) {} +void startup_early_hook(void) __attribute__ ((weak, alias("startup_default_early_hook"))); +void startup_late_hook(void) __attribute__ ((weak, alias("startup_default_late_hook"))); + +__attribute__ ((section(".startup"))) +void ResetHandler(void) +{ + uint32_t *src = &_etext; + uint32_t *dest = &_sdata; + unsigned int i; +#if F_CPU <= 2000000 + volatile int n; +#endif + + WDOG_UNLOCK = WDOG_UNLOCK_SEQ1; + WDOG_UNLOCK = WDOG_UNLOCK_SEQ2; + __asm__ volatile ("nop"); + __asm__ volatile ("nop"); + // programs using the watchdog timer or needing to initialize hardware as + // early as possible can implement startup_early_hook() + 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; + + // since this is a write once register, make it visible to all F_CPU's + // so we can into other sleep modes in the future at any speed + SMC_PMPROT = SMC_PMPROT_AVLP | SMC_PMPROT_ALLS | SMC_PMPROT_AVLLS; + + // 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); + + // hardware always starts in FEI mode + // C1[CLKS] bits are written to 00 + // C1[IREFS] bit is written to 1 + // C6[PLLS] bit is written to 0 +// MCG_SC[FCDIV] defaults to divide by two for internal ref clock +// I tried changing MSG_SC to divide by 1, it didn't work for me +#if F_CPU <= 2000000 + // use the internal oscillator + MCG_C1 = MCG_C1_CLKS(1) | MCG_C1_IREFS; + // wait for MCGOUT to use oscillator + while ((MCG_S & MCG_S_CLKST_MASK) != MCG_S_CLKST(1)) ; + for (n=0; n<10; n++) ; // TODO: why do we get 2 mA extra without this delay? + MCG_C2 = MCG_C2_IRCS; + while (!(MCG_S & MCG_S_IRCST)) ; + // now in FBI mode: + // C1[CLKS] bits are written to 01 + // C1[IREFS] bit is written to 1 + // C6[PLLS] is written to 0 + // C2[LP] is written to 0 + MCG_C2 = MCG_C2_IRCS | MCG_C2_LP; + // now in BLPI mode: + // C1[CLKS] bits are written to 01 + // C1[IREFS] bit is written to 1 + // C6[PLLS] bit is written to 0 + // C2[LP] bit is written to 1 +#else + // 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 in FBE mode + // C1[CLKS] bits are written to 10 + // C1[IREFS] bit is written to 0 + // C1[FRDIV] must be written to divide xtal to 31.25-39 kHz + // C6[PLLS] bit is written to 0 + // C2[LP] is written to 0 + #if F_CPU <= 16000000 + // if the crystal is fast enough, use it directly (no FLL or PLL) + MCG_C2 = MCG_C2_RANGE0(2) | MCG_C2_EREFS | MCG_C2_LP; + // BLPE mode: + // C1[CLKS] bits are written to 10 + // C1[IREFS] bit is written to 0 + // C2[LP] bit is written to 1 + #else + // if we need faster than the crystal, turn on the PLL + #if F_CPU == 72000000 + MCG_C5 = MCG_C5_PRDIV0(5); // config PLL input for 16 MHz Crystal / 6 = 2.667 Hz + #else + MCG_C5 = MCG_C5_PRDIV0(3); // config PLL input for 16 MHz Crystal / 4 = 4 MHz + #endif + #if F_CPU == 168000000 + MCG_C6 = MCG_C6_PLLS | MCG_C6_VDIV0(18); // config PLL for 168 MHz output + #elif F_CPU == 144000000 + MCG_C6 = MCG_C6_PLLS | MCG_C6_VDIV0(12); // config PLL for 144 MHz output + #elif F_CPU == 120000000 + MCG_C6 = MCG_C6_PLLS | MCG_C6_VDIV0(6); // config PLL for 120 MHz output + #elif F_CPU == 72000000 + MCG_C6 = MCG_C6_PLLS | MCG_C6_VDIV0(3); // config PLL for 72 MHz output + #else + MCG_C6 = MCG_C6_PLLS | MCG_C6_VDIV0(0); // config PLL for 96 MHz output + #endif + // 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 + #endif +#endif + + // now program the clock dividers +#if F_CPU == 168000000 + // config divisors: 168 MHz core, 56 MHz bus, 33.6 MHz flash, USB = 168 * 2 / 7 + SIM_CLKDIV1 = SIM_CLKDIV1_OUTDIV1(0) | SIM_CLKDIV1_OUTDIV2(2) | SIM_CLKDIV1_OUTDIV4(4); + SIM_CLKDIV2 = SIM_CLKDIV2_USBDIV(6) | SIM_CLKDIV2_USBFRAC; +#elif F_CPU == 144000000 + // config divisors: 144 MHz core, 48 MHz bus, 28.8 MHz flash, USB = 144 / 3 + SIM_CLKDIV1 = SIM_CLKDIV1_OUTDIV1(0) | SIM_CLKDIV1_OUTDIV2(2) | SIM_CLKDIV1_OUTDIV4(4); + SIM_CLKDIV2 = SIM_CLKDIV2_USBDIV(2); +#elif F_CPU == 120000000 + // config divisors: 120 MHz core, 60 MHz bus, 24 MHz flash, USB = 128 * 2 / 5 + SIM_CLKDIV1 = SIM_CLKDIV1_OUTDIV1(0) | SIM_CLKDIV1_OUTDIV2(1) | SIM_CLKDIV1_OUTDIV4(4); + SIM_CLKDIV2 = SIM_CLKDIV2_USBDIV(4) | SIM_CLKDIV2_USBFRAC; +#elif F_CPU == 96000000 + // config divisors: 96 MHz core, 48 MHz bus, 24 MHz flash, USB = 96 / 2 + SIM_CLKDIV1 = SIM_CLKDIV1_OUTDIV1(0) | SIM_CLKDIV1_OUTDIV2(1) | SIM_CLKDIV1_OUTDIV4(3); + SIM_CLKDIV2 = SIM_CLKDIV2_USBDIV(1); +#elif F_CPU == 72000000 + // config divisors: 72 MHz core, 36 MHz bus, 24 MHz flash, USB = 72 * 2 / 3 + SIM_CLKDIV1 = SIM_CLKDIV1_OUTDIV1(0) | SIM_CLKDIV1_OUTDIV2(1) | SIM_CLKDIV1_OUTDIV4(2); + SIM_CLKDIV2 = SIM_CLKDIV2_USBDIV(2) | SIM_CLKDIV2_USBFRAC; +#elif F_CPU == 48000000 + // config divisors: 48 MHz core, 48 MHz bus, 24 MHz flash, USB = 96 / 2 + SIM_CLKDIV1 = SIM_CLKDIV1_OUTDIV1(1) | SIM_CLKDIV1_OUTDIV2(1) | SIM_CLKDIV1_OUTDIV4(3); + SIM_CLKDIV2 = SIM_CLKDIV2_USBDIV(1); +#elif F_CPU == 24000000 + // config divisors: 24 MHz core, 24 MHz bus, 24 MHz flash, USB = 96 / 2 + SIM_CLKDIV1 = SIM_CLKDIV1_OUTDIV1(3) | SIM_CLKDIV1_OUTDIV2(3) | SIM_CLKDIV1_OUTDIV4(3); + SIM_CLKDIV2 = SIM_CLKDIV2_USBDIV(1); +#elif F_CPU == 16000000 + // config divisors: 16 MHz core, 16 MHz bus, 16 MHz flash + SIM_CLKDIV1 = SIM_CLKDIV1_OUTDIV1(0) | SIM_CLKDIV1_OUTDIV2(0) | SIM_CLKDIV1_OUTDIV4(0); +#elif F_CPU == 8000000 + // config divisors: 8 MHz core, 8 MHz bus, 8 MHz flash + SIM_CLKDIV1 = SIM_CLKDIV1_OUTDIV1(1) | SIM_CLKDIV1_OUTDIV2(1) | SIM_CLKDIV1_OUTDIV4(1); +#elif F_CPU == 4000000 + // config divisors: 4 MHz core, 4 MHz bus, 2 MHz flash + // since we are running from external clock 16MHz + // fix outdiv too -> cpu 16/4, bus 16/4, flash 16/4 + // here we can go into vlpr? + // config divisors: 4 MHz core, 4 MHz bus, 4 MHz flash + SIM_CLKDIV1 = SIM_CLKDIV1_OUTDIV1(3) | SIM_CLKDIV1_OUTDIV2(3) | SIM_CLKDIV1_OUTDIV4(3); +#elif F_CPU == 2000000 + // since we are running from the fast internal reference clock 4MHz + // but is divided down by 2 so we actually have a 2MHz, MCG_SC[FCDIV] default is 2 + // fix outdiv -> cpu 2/1, bus 2/1, flash 2/2 + // config divisors: 2 MHz core, 2 MHz bus, 1 MHz flash + SIM_CLKDIV1 = SIM_CLKDIV1_OUTDIV1(0) | SIM_CLKDIV1_OUTDIV2(0) | SIM_CLKDIV1_OUTDIV4(1); +#else +#error "Error, F_CPU must be 168, 144, 120, 96, 72, 48, 24, 16, 8, 4, or 2 MHz" +#endif + +#if F_CPU > 16000000 + // 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 + // 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); +#else + SIM_SOPT2 = SIM_SOPT2_TRACECLKSEL | SIM_SOPT2_CLKOUTSEL(3); +#endif + +#if F_CPU <= 2000000 + // since we are not going into "stop mode" i removed it + SMC_PMCTRL = SMC_PMCTRL_RUNM(2); // VLPR mode :-) +#endif + + // 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_(); + if (RTC_SR & RTC_SR_TIF) { + // TODO: this should probably set the time more agressively, if + // we could reliably detect the first reboot after programming. + rtc_set(TIME_T); + } + + __libc_init_array(); + + startup_late_hook(); + main(); + while (1) ; +} + +char *__brkval = (char *)&_ebss; + +void * _sbrk(int incr) +{ + char *prev = __brkval; + __brkval += incr; + return prev; +} + +__attribute__((weak)) +int _read(int file, char *ptr, int len) +{ + return 0; +} + +__attribute__((weak)) +int _close(int fd) +{ + return -1; +} + +#include <sys/stat.h> + +__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 (char *g) +{ + return !(*g); +} + +__attribute__((weak)) +void __cxa_guard_release(char *g) +{ + *g = 1; +} + +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; +} + |