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teensy-cores/teensy3/mk20dx128.c

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  1. /* Teensyduino Core Library

  2.  * http://www.pjrc.com/teensy/

  3.  * Copyright (c) 2013 PJRC.COM, LLC.

  4.  *

  5.  * Permission is hereby granted, free of charge, to any person obtaining

  6.  * a copy of this software and associated documentation files (the

  7.  * "Software"), to deal in the Software without restriction, including

  8.  * without limitation the rights to use, copy, modify, merge, publish,

  9.  * distribute, sublicense, and/or sell copies of the Software, and to

  10.  * permit persons to whom the Software is furnished to do so, subject to

  11.  * the following conditions:

  12.  *

  13.  * 1. The above copyright notice and this permission notice shall be 

  14.  * included in all copies or substantial portions of the Software.

  15.  *

  16.  * 2. If the Software is incorporated into a build system that allows 

  17.  * selection among a list of target devices, then similar target

  18.  * devices manufactured by PJRC.COM must be included in the list of

  19.  * target devices and selectable in the same manner.

  20.  *

  21.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

  22.  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

  23.  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

  24.  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS

  25.  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN

  26.  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

  27.  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

  28.  * SOFTWARE.

  29.  */

  30. 

  31. #include "mk20dx128.h"

  32. 

  33. 

  34. extern unsigned long _stext;

  35. extern unsigned long _etext;

  36. extern unsigned long _sdata;

  37. extern unsigned long _edata;

  38. extern unsigned long _sbss;

  39. extern unsigned long _ebss;

  40. extern unsigned long _estack;

  41. //extern void __init_array_start(void);

  42. //extern void __init_array_end(void);

  43. extern int main (void);

  44. void ResetHandler(void);

  45. void _init_Teensyduino_internal_(void);

  46. void __libc_init_array(void);

  47. 

  48. 

  49. void fault_isr(void)

  50. {

  51. 	while (1) {

  52. 		// keep polling some communication while in fault

  53. 		// mode, so we don't completely die.

  54. 		if (SIM_SCGC4 & SIM_SCGC4_USBOTG) usb_isr();

  55. 		if (SIM_SCGC4 & SIM_SCGC4_UART0) uart0_status_isr();

  56. 		if (SIM_SCGC4 & SIM_SCGC4_UART1) uart1_status_isr();

  57. 		if (SIM_SCGC4 & SIM_SCGC4_UART2) uart2_status_isr();

  58. 	}

  59. }

  60. 

  61. void unused_isr(void)

  62. {

  63. 	fault_isr();

  64. }

  65. 

  66. extern volatile uint32_t systick_millis_count;

  67. void systick_default_isr(void)

  68. {

  69. 	systick_millis_count++;

  70. }

  71. 

  72. void nmi_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  73. void hard_fault_isr(void)	__attribute__ ((weak, alias("unused_isr")));

  74. void memmanage_fault_isr(void)	__attribute__ ((weak, alias("unused_isr")));

  75. void bus_fault_isr(void)	__attribute__ ((weak, alias("unused_isr")));

  76. void usage_fault_isr(void)	__attribute__ ((weak, alias("unused_isr")));

  77. void svcall_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  78. void debugmonitor_isr(void)	__attribute__ ((weak, alias("unused_isr")));

  79. void pendablesrvreq_isr(void)	__attribute__ ((weak, alias("unused_isr")));

  80. void systick_isr(void)		__attribute__ ((weak, alias("systick_default_isr")));

  81. 

  82. void dma_ch0_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  83. void dma_ch1_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  84. void dma_ch2_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  85. void dma_ch3_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  86. void dma_ch4_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  87. void dma_ch5_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  88. void dma_ch6_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  89. void dma_ch7_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  90. void dma_ch8_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  91. void dma_ch9_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  92. void dma_ch10_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  93. void dma_ch11_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  94. void dma_ch12_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  95. void dma_ch13_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  96. void dma_ch14_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  97. void dma_ch15_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  98. void dma_error_isr(void)	__attribute__ ((weak, alias("unused_isr")));

  99. void mcm_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  100. void flash_cmd_isr(void)	__attribute__ ((weak, alias("unused_isr")));

  101. void flash_error_isr(void)	__attribute__ ((weak, alias("unused_isr")));

  102. void low_voltage_isr(void)	__attribute__ ((weak, alias("unused_isr")));

  103. void wakeup_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  104. void watchdog_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  105. void i2c0_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  106. void i2c1_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  107. void i2c2_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  108. void spi0_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  109. void spi1_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  110. void spi2_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  111. void sdhc_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  112. void can0_message_isr(void)	__attribute__ ((weak, alias("unused_isr")));

  113. void can0_bus_off_isr(void)	__attribute__ ((weak, alias("unused_isr")));

  114. void can0_error_isr(void)	__attribute__ ((weak, alias("unused_isr")));

  115. void can0_tx_warn_isr(void)	__attribute__ ((weak, alias("unused_isr")));

  116. void can0_rx_warn_isr(void)	__attribute__ ((weak, alias("unused_isr")));

  117. void can0_wakeup_isr(void)	__attribute__ ((weak, alias("unused_isr")));

  118. void i2s0_tx_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  119. void i2s0_rx_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  120. void uart0_lon_isr(void)	__attribute__ ((weak, alias("unused_isr")));

  121. void uart0_status_isr(void)	__attribute__ ((weak, alias("unused_isr")));

  122. void uart0_error_isr(void)	__attribute__ ((weak, alias("unused_isr")));

  123. void uart1_status_isr(void)	__attribute__ ((weak, alias("unused_isr")));

  124. void uart1_error_isr(void)	__attribute__ ((weak, alias("unused_isr")));

  125. void uart2_status_isr(void)	__attribute__ ((weak, alias("unused_isr")));

  126. void uart2_error_isr(void)	__attribute__ ((weak, alias("unused_isr")));

  127. void uart3_status_isr(void)	__attribute__ ((weak, alias("unused_isr")));

  128. void uart3_error_isr(void)	__attribute__ ((weak, alias("unused_isr")));

  129. void uart4_status_isr(void)	__attribute__ ((weak, alias("unused_isr")));

  130. void uart4_error_isr(void)	__attribute__ ((weak, alias("unused_isr")));

  131. void uart5_status_isr(void)	__attribute__ ((weak, alias("unused_isr")));

  132. void uart5_error_isr(void)	__attribute__ ((weak, alias("unused_isr")));

  133. void adc0_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  134. void adc1_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  135. void cmp0_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  136. void cmp1_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  137. void cmp2_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  138. void ftm0_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  139. void ftm1_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  140. void ftm2_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  141. void ftm3_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  142. void cmt_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  143. void rtc_alarm_isr(void)	__attribute__ ((weak, alias("unused_isr")));

  144. void rtc_seconds_isr(void)	__attribute__ ((weak, alias("unused_isr")));

  145. void pit0_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  146. void pit1_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  147. void pit2_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  148. void pit3_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  149. void pdb_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  150. void usb_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  151. void usb_charge_isr(void)	__attribute__ ((weak, alias("unused_isr")));

  152. void dac0_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  153. void dac1_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  154. void tsi0_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  155. void mcg_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  156. void lptmr_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  157. void porta_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  158. void portb_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  159. void portc_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  160. void portd_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  161. void porte_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  162. void software_isr(void)		__attribute__ ((weak, alias("unused_isr")));

  163. 

  164. 

  165. // TODO: create AVR-stype ISR() macro, with default linkage to undefined handler

  166. //

  167. __attribute__ ((section(".vectors"), used))

  168. void (* const gVectors[])(void) =

  169. {

  170. 	(void (*)(void))((unsigned long)&_estack),	//  0 ARM: Initial Stack Pointer

  171. 	ResetHandler,					//  1 ARM: Initial Program Counter

  172. 	nmi_isr,					//  2 ARM: Non-maskable Interrupt (NMI)

  173. 	hard_fault_isr,					//  3 ARM: Hard Fault

  174. 	memmanage_fault_isr,				//  4 ARM: MemManage Fault

  175. 	bus_fault_isr,					//  5 ARM: Bus Fault

  176. 	usage_fault_isr,				//  6 ARM: Usage Fault

  177. 	fault_isr,					//  7 --

  178. 	fault_isr,					//  8 --

  179. 	fault_isr,					//  9 --

  180. 	fault_isr,					// 10 --

  181. 	svcall_isr,					// 11 ARM: Supervisor call (SVCall)

  182. 	debugmonitor_isr,				// 12 ARM: Debug Monitor

  183. 	fault_isr,					// 13 --

  184. 	pendablesrvreq_isr,				// 14 ARM: Pendable req serv(PendableSrvReq)

  185. 	systick_isr,					// 15 ARM: System tick timer (SysTick)

  186. #if defined(__MK20DX128__)

  187. 	dma_ch0_isr,					// 16 DMA channel 0 transfer complete

  188. 	dma_ch1_isr,					// 17 DMA channel 1 transfer complete

  189. 	dma_ch2_isr,					// 18 DMA channel 2 transfer complete

  190. 	dma_ch3_isr,					// 19 DMA channel 3 transfer complete

  191. 	dma_error_isr,					// 20 DMA error interrupt channel

  192. 	unused_isr,					// 21 DMA --

  193. 	flash_cmd_isr,					// 22 Flash Memory Command complete

  194. 	flash_error_isr,				// 23 Flash Read collision

  195. 	low_voltage_isr,				// 24 Low-voltage detect/warning

  196. 	wakeup_isr,					// 25 Low Leakage Wakeup

  197. 	watchdog_isr,					// 26 Both EWM and WDOG interrupt

  198. 	i2c0_isr,					// 27 I2C0

  199. 	spi0_isr,					// 28 SPI0

  200. 	i2s0_tx_isr,					// 29 I2S0 Transmit

  201. 	i2s0_rx_isr,					// 30 I2S0 Receive

  202. 	uart0_lon_isr,					// 31 UART0 CEA709.1-B (LON) status

  203. 	uart0_status_isr,				// 32 UART0 status

  204. 	uart0_error_isr,				// 33 UART0 error

  205. 	uart1_status_isr,				// 34 UART1 status

  206. 	uart1_error_isr,				// 35 UART1 error

  207. 	uart2_status_isr,				// 36 UART2 status

  208. 	uart2_error_isr,				// 37 UART2 error

  209. 	adc0_isr,					// 38 ADC0

  210. 	cmp0_isr,					// 39 CMP0

  211. 	cmp1_isr,					// 40 CMP1

  212. 	ftm0_isr,					// 41 FTM0

  213. 	ftm1_isr,					// 42 FTM1

  214. 	cmt_isr,					// 43 CMT

  215. 	rtc_alarm_isr,					// 44 RTC Alarm interrupt

  216. 	rtc_seconds_isr,				// 45 RTC Seconds interrupt

  217. 	pit0_isr,					// 46 PIT Channel 0

  218. 	pit1_isr,					// 47 PIT Channel 1

  219. 	pit2_isr,					// 48 PIT Channel 2

  220. 	pit3_isr,					// 49 PIT Channel 3

  221. 	pdb_isr,					// 50 PDB Programmable Delay Block

  222. 	usb_isr,					// 51 USB OTG

  223. 	usb_charge_isr,					// 52 USB Charger Detect

  224. 	tsi0_isr,					// 53 TSI0

  225. 	mcg_isr,					// 54 MCG

  226. 	lptmr_isr,					// 55 Low Power Timer

  227. 	porta_isr,					// 56 Pin detect (Port A)

  228. 	portb_isr,					// 57 Pin detect (Port B)

  229. 	portc_isr,					// 58 Pin detect (Port C)

  230. 	portd_isr,					// 59 Pin detect (Port D)

  231. 	porte_isr,					// 60 Pin detect (Port E)

  232. 	software_isr,					// 61 Software interrupt

  233. #elif defined(__MK20DX256__)

  234. 	dma_ch0_isr,					// 16 DMA channel 0 transfer complete

  235. 	dma_ch1_isr,					// 17 DMA channel 1 transfer complete

  236. 	dma_ch2_isr,					// 18 DMA channel 2 transfer complete

  237. 	dma_ch3_isr,					// 19 DMA channel 3 transfer complete

  238. 	dma_ch4_isr,					// 20 DMA channel 4 transfer complete

  239. 	dma_ch5_isr,					// 21 DMA channel 5 transfer complete

  240. 	dma_ch6_isr,					// 22 DMA channel 6 transfer complete

  241. 	dma_ch7_isr,					// 23 DMA channel 7 transfer complete

  242. 	dma_ch8_isr,					// 24 DMA channel 8 transfer complete

  243. 	dma_ch9_isr,					// 25 DMA channel 9 transfer complete

  244. 	dma_ch10_isr,					// 26 DMA channel 10 transfer complete

  245. 	dma_ch11_isr,					// 27 DMA channel 10 transfer complete

  246. 	dma_ch12_isr,					// 28 DMA channel 10 transfer complete

  247. 	dma_ch13_isr,					// 29 DMA channel 10 transfer complete

  248. 	dma_ch14_isr,					// 30 DMA channel 10 transfer complete

  249. 	dma_ch15_isr,					// 31 DMA channel 10 transfer complete

  250. 	dma_error_isr,					// 32 DMA error interrupt channel

  251. 	unused_isr,					// 33 --

  252. 	flash_cmd_isr,					// 34 Flash Memory Command complete

  253. 	flash_error_isr,				// 35 Flash Read collision

  254. 	low_voltage_isr,				// 36 Low-voltage detect/warning

  255. 	wakeup_isr,					// 37 Low Leakage Wakeup

  256. 	watchdog_isr,					// 38 Both EWM and WDOG interrupt

  257. 	unused_isr,					// 39 --

  258. 	i2c0_isr,					// 40 I2C0

  259. 	i2c1_isr,					// 41 I2C1

  260. 	spi0_isr,					// 42 SPI0

  261. 	spi1_isr,					// 43 SPI1

  262. 	unused_isr,					// 44 --

  263. 	can0_message_isr,				// 45 CAN OR'ed Message buffer (0-15)

  264. 	can0_bus_off_isr,				// 46 CAN Bus Off

  265. 	can0_error_isr,					// 47 CAN Error

  266. 	can0_tx_warn_isr,				// 48 CAN Transmit Warning

  267. 	can0_rx_warn_isr,				// 49 CAN Receive Warning

  268. 	can0_wakeup_isr,				// 50 CAN Wake Up

  269. 	i2s0_tx_isr,					// 51 I2S0 Transmit

  270. 	i2s0_rx_isr,					// 52 I2S0 Receive

  271. 	unused_isr,					// 53 --

  272. 	unused_isr,					// 54 --

  273. 	unused_isr,					// 55 --

  274. 	unused_isr,					// 56 --

  275. 	unused_isr,					// 57 --

  276. 	unused_isr,					// 58 --

  277. 	unused_isr,					// 59 --

  278. 	uart0_lon_isr,					// 60 UART0 CEA709.1-B (LON) status

  279. 	uart0_status_isr,				// 61 UART0 status

  280. 	uart0_error_isr,				// 62 UART0 error

  281. 	uart1_status_isr,				// 63 UART1 status

  282. 	uart1_error_isr,				// 64 UART1 error

  283. 	uart2_status_isr,				// 65 UART2 status

  284. 	uart2_error_isr,				// 66 UART2 error

  285. 	unused_isr,					// 67 --

  286. 	unused_isr,					// 68 --

  287. 	unused_isr,					// 69 --

  288. 	unused_isr,					// 70 --

  289. 	unused_isr,					// 71 --

  290. 	unused_isr,					// 72 --

  291. 	adc0_isr,					// 73 ADC0

  292. 	adc1_isr,					// 74 ADC1

  293. 	cmp0_isr,					// 75 CMP0

  294. 	cmp1_isr,					// 76 CMP1

  295. 	cmp2_isr,					// 77 CMP2

  296. 	ftm0_isr,					// 78 FTM0

  297. 	ftm1_isr,					// 79 FTM1

  298. 	ftm2_isr,					// 80 FTM2

  299. 	cmt_isr,					// 81 CMT

  300. 	rtc_alarm_isr,					// 82 RTC Alarm interrupt

  301. 	rtc_seconds_isr,				// 83 RTC Seconds interrupt

  302. 	pit0_isr,					// 84 PIT Channel 0

  303. 	pit1_isr,					// 85 PIT Channel 1

  304. 	pit2_isr,					// 86 PIT Channel 2

  305. 	pit3_isr,					// 87 PIT Channel 3

  306. 	pdb_isr,					// 88 PDB Programmable Delay Block

  307. 	usb_isr,					// 89 USB OTG

  308. 	usb_charge_isr,					// 90 USB Charger Detect

  309. 	unused_isr,					// 91 --

  310. 	unused_isr,					// 92 --

  311. 	unused_isr,					// 93 --

  312. 	unused_isr,					// 94 --

  313. 	unused_isr,					// 95 --

  314. 	unused_isr,					// 96 --

  315. 	dac0_isr,					// 97 DAC0

  316. 	unused_isr,					// 98 --

  317. 	tsi0_isr,					// 99 TSI0

  318. 	mcg_isr,					// 100 MCG

  319. 	lptmr_isr,					// 101 Low Power Timer

  320. 	unused_isr,					// 102 --

  321. 	porta_isr,					// 103 Pin detect (Port A)

  322. 	portb_isr,					// 104 Pin detect (Port B)

  323. 	portc_isr,					// 105 Pin detect (Port C)

  324. 	portd_isr,					// 106 Pin detect (Port D)

  325. 	porte_isr,					// 107 Pin detect (Port E)

  326. 	unused_isr,					// 108 --

  327. 	unused_isr,					// 109 --

  328. 	software_isr,					// 110 Software interrupt

  329. #endif

  330. };

  331. 

  332. //void usb_isr(void)

  333. //{

  334. //}

  335. 

  336. __attribute__ ((section(".flashconfig"), used))

  337. const uint8_t flashconfigbytes[16] = {

  338. 	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,

  339. 	0xFF, 0xFF, 0xFF, 0xFF, 0xFE, 0xFF, 0xFF, 0xFF

  340. };

  341. 

  342. 

  343. // Automatically initialize the RTC.  When the build defines the compile

  344. // time, and the user has added a crystal, the RTC will automatically

  345. // begin at the time of the first upload.

  346. #ifndef TIME_T

  347. #define TIME_T 1349049600 // default 1 Oct 2012 (never used, Arduino sets this)

  348. #endif

  349. extern void rtc_set(unsigned long t);

  350. 

  351. 

  352. static void startup_default_early_hook(void) { WDOG_STCTRLH = WDOG_STCTRLH_ALLOWUPDATE; }

  353. static void startup_default_late_hook(void) {}

  354. void startup_early_hook(void)		__attribute__ ((weak, alias("startup_default_early_hook")));

  355. void startup_late_hook(void)		__attribute__ ((weak, alias("startup_default_late_hook")));

  356. 

  357. __attribute__ ((section(".startup")))

  358. void ResetHandler(void)

  359. {

  360. 	uint32_t *src = &_etext;

  361. 	uint32_t *dest = &_sdata;

  362. 	unsigned int i;

  363. 

  364. 	WDOG_UNLOCK = WDOG_UNLOCK_SEQ1;

  365. 	WDOG_UNLOCK = WDOG_UNLOCK_SEQ2;

  366. 	asm volatile ("nop");

  367. 	asm volatile ("nop");

  368. 	// programs using the watchdog timer or needing to initialize hardware as

  369. 	// early as possible can implement startup_early_hook()

  370. 	startup_early_hook();

  371. 

  372. 	// enable clocks to always-used peripherals

  373. #if defined(__MK20DX128__)

  374. 	SIM_SCGC5 = 0x00043F82;		// clocks active to all GPIO

  375. 	SIM_SCGC6 = SIM_SCGC6_RTC | SIM_SCGC6_FTM0 | SIM_SCGC6_FTM1 | SIM_SCGC6_ADC0 | SIM_SCGC6_FTFL;

  376. #elif defined(__MK20DX256__)

  377. 	SIM_SCGC3 = SIM_SCGC3_ADC1 | SIM_SCGC3_FTM2;

  378. 	SIM_SCGC5 = 0x00043F82;		// clocks active to all GPIO

  379. 	SIM_SCGC6 = SIM_SCGC6_RTC | SIM_SCGC6_FTM0 | SIM_SCGC6_FTM1 | SIM_SCGC6_ADC0 | SIM_SCGC6_FTFL;

  380. #endif

  381. 

  382. 	// if the RTC oscillator isn't enabled, get it started early

  383. 	if (!(RTC_CR & RTC_CR_OSCE)) {

  384. 		RTC_SR = 0;

  385. 		RTC_CR = RTC_CR_SC16P | RTC_CR_SC4P | RTC_CR_OSCE;

  386. 	}

  387. 

  388. 	// release I/O pins hold, if we woke up from VLLS mode

  389. 	if (PMC_REGSC & PMC_REGSC_ACKISO) PMC_REGSC |= PMC_REGSC_ACKISO;

  390. 

  391. 	// TODO: do this while the PLL is waiting to lock....

  392. 	while (dest < &_edata) *dest++ = *src++;

  393. 	dest = &_sbss;

  394. 	while (dest < &_ebss) *dest++ = 0;

  395. 	SCB_VTOR = 0;	// use vector table in flash

  396. 

  397. 	// default all interrupts to medium priority level

  398. 	for (i=0; i < NVIC_NUM_INTERRUPTS; i++) NVIC_SET_PRIORITY(i, 128);

  399. 

  400. 	// start in FEI mode

  401. 	// enable capacitors for crystal

  402. 	OSC0_CR = OSC_SC8P | OSC_SC2P;

  403. 	// enable osc, 8-32 MHz range, low power mode

  404. 	MCG_C2 = MCG_C2_RANGE0(2) | MCG_C2_EREFS;

  405. 	// switch to crystal as clock source, FLL input = 16 MHz / 512

  406. 	MCG_C1 =  MCG_C1_CLKS(2) | MCG_C1_FRDIV(4);

  407. 	// wait for crystal oscillator to begin

  408. 	while ((MCG_S & MCG_S_OSCINIT0) == 0) ;

  409. 	// wait for FLL to use oscillator

  410. 	while ((MCG_S & MCG_S_IREFST) != 0) ;

  411. 	// wait for MCGOUT to use oscillator

  412. 	while ((MCG_S & MCG_S_CLKST_MASK) != MCG_S_CLKST(2)) ;

  413. 	// now we're in FBE mode

  414. 	// config PLL input for 16 MHz Crystal / 4 = 4 MHz

  415. 	MCG_C5 = MCG_C5_PRDIV0(3);

  416. 	// config PLL for 96 MHz output

  417. 	MCG_C6 = MCG_C6_PLLS | MCG_C6_VDIV0(0);

  418. 	// wait for PLL to start using xtal as its input

  419. 	while (!(MCG_S & MCG_S_PLLST)) ;

  420. 	// wait for PLL to lock

  421. 	while (!(MCG_S & MCG_S_LOCK0)) ;

  422. 	// now we're in PBE mode

  423. #if F_CPU == 96000000

  424. 	// config divisors: 96 MHz core, 48 MHz bus, 24 MHz flash

  425. 	SIM_CLKDIV1 = SIM_CLKDIV1_OUTDIV1(0) | SIM_CLKDIV1_OUTDIV2(1) |	 SIM_CLKDIV1_OUTDIV4(3);

  426. #elif F_CPU == 48000000

  427. 	// config divisors: 48 MHz core, 48 MHz bus, 24 MHz flash

  428. 	SIM_CLKDIV1 = SIM_CLKDIV1_OUTDIV1(1) | SIM_CLKDIV1_OUTDIV2(1) |	 SIM_CLKDIV1_OUTDIV4(3);

  429. #elif F_CPU == 24000000

  430. 	// config divisors: 24 MHz core, 24 MHz bus, 24 MHz flash

  431. 	SIM_CLKDIV1 = SIM_CLKDIV1_OUTDIV1(3) | SIM_CLKDIV1_OUTDIV2(3) |	 SIM_CLKDIV1_OUTDIV4(3);

  432. #else

  433. #error "Error, F_CPU must be 96000000, 48000000, or 24000000"

  434. #endif

  435. 	// switch to PLL as clock source, FLL input = 16 MHz / 512

  436. 	MCG_C1 = MCG_C1_CLKS(0) | MCG_C1_FRDIV(4);

  437. 	// wait for PLL clock to be used

  438. 	while ((MCG_S & MCG_S_CLKST_MASK) != MCG_S_CLKST(3)) ;

  439. 	// now we're in PEE mode

  440. 	// configure USB for 48 MHz clock

  441. 	SIM_CLKDIV2 = SIM_CLKDIV2_USBDIV(1); // USB = 96 MHz PLL / 2

  442. 	// USB uses PLL clock, trace is CPU clock, CLKOUT=OSCERCLK0

  443. 	SIM_SOPT2 = SIM_SOPT2_USBSRC | SIM_SOPT2_PLLFLLSEL | SIM_SOPT2_TRACECLKSEL | SIM_SOPT2_CLKOUTSEL(6);

  444. 

  445. 	// initialize the SysTick counter

  446. 	SYST_RVR = (F_CPU / 1000) - 1;

  447. 	SYST_CSR = SYST_CSR_CLKSOURCE | SYST_CSR_TICKINT | SYST_CSR_ENABLE;

  448. 

  449. 	//init_pins();

  450. 	__enable_irq();

  451. 

  452. 	_init_Teensyduino_internal_();

  453. 	if (RTC_SR & RTC_SR_TIF) rtc_set(TIME_T);

  454. 

  455. 	__libc_init_array();

  456. 

  457. /*

  458. 	for (ptr = &__init_array_start; ptr < &__init_array_end; ptr++) {

  459. 		(*ptr)();

  460. 	}

  461. */

  462. 	startup_late_hook();

  463. 	main();

  464. 	while (1) ;

  465. }

  466. 

  467. // TODO: is this needed for c++ and where does it come from?

  468. /*

  469. void _init(void)

  470. {

  471. }

  472. */

  473. 

  474. char *__brkval = (char *)&_ebss;

  475. 

  476. void * _sbrk(int incr)

  477. {

  478. 	//static char *heap_end = (char *)&_ebss;

  479. 	//char *prev = heap_end;

  480. 	//heap_end += incr;

  481. 

  482. 	char *prev = __brkval;

  483. 	__brkval += incr;

  484. 	return prev;

  485. }

  486. 

  487. __attribute__((weak)) 

  488. int _read(int file, char *ptr, int len)

  489. {

  490. 	return 0;

  491. }

  492. 

  493. /*  moved to Print.cpp, to support Print::printf()

  494. __attribute__((weak)) 

  495. int _write(int file, char *ptr, int len)

  496. {

  497. 	return 0;

  498. }

  499. */

  500. 

  501. __attribute__((weak)) 

  502. int _close(int fd)

  503. {

  504. 	return -1;

  505. }

  506. 

  507. #include <sys/stat.h>

  508. 

  509. __attribute__((weak)) 

  510. int _fstat(int fd, struct stat *st)

  511. {

  512. 	st->st_mode = S_IFCHR;

  513. 	return 0;

  514. }

  515. 

  516. __attribute__((weak)) 

  517. int _isatty(int fd)

  518. {

  519. 	return 1;

  520. }

  521. 

  522. __attribute__((weak)) 

  523. int _lseek(int fd, long long offset, int whence)

  524. {

  525. 	return -1;

  526. }

  527. 

  528. __attribute__((weak)) 

  529. void _exit(int status)

  530. {

  531. 	while (1);

  532. }

  533. 

  534. __attribute__((weak)) 

  535. void __cxa_pure_virtual()

  536. {

  537. 	while (1);

  538. }

  539. 

  540. __attribute__((weak)) 

  541. int __cxa_guard_acquire (char *g) 

  542. {

  543. 	return !(*g);

  544. }

  545. 

  546. __attribute__((weak)) 

  547. void __cxa_guard_release(char *g)

  548. {

  549. 	*g = 1;

  550. }

  551. 

  552. int nvic_execution_priority(void)

  553. {

  554. 	int priority=256;

  555. 	uint32_t primask, faultmask, basepri, ipsr;

  556. 

  557. 	// full algorithm in ARM DDI0403D, page B1-639

  558. 	// this isn't quite complete, but hopefully good enough

  559. 	asm volatile("mrs %0, faultmask\n" : "=r" (faultmask)::);

  560. 	if (faultmask) return -1;

  561. 	asm volatile("mrs %0, primask\n" : "=r" (primask)::);

  562. 	if (primask) return 0;

  563. 	asm volatile("mrs %0, ipsr\n" : "=r" (ipsr)::);

  564. 	if (ipsr) {

  565. 		if (ipsr < 16) priority = 0; // could be non-zero

  566. 		else priority = NVIC_GET_PRIORITY(ipsr - 16);

  567. 	}

  568. 	asm volatile("mrs %0, basepri\n" : "=r" (basepri)::);

  569. 	if (basepri > 0 && basepri < priority) priority = basepri;

  570. 	return priority;

  571. }