begriffs open source - cmsis-freertos/blob - Demo/ColdFire_MCF52221_CodeWarrior/sources/MCF52221

1 /*

2 * File: mcf52221_sysinit.c

3 * Purpose: Power-on Reset configuration of the MCF52221.

4 *

5 * Notes:

6 *

7 */

8 #include "support_common.h"

9 #include "exceptions.h"

13 /********************************************************************/

14 static void pll_init(void)

15 {

17 MCF_CLOCK_CCHR =0x05; // The PLL pre divider - 48MHz / 6 = 8MHz

19 /* The PLL pre-divider affects this!!!

20 * Multiply 8Mhz reference crystal /CCHR by 10 to acheive system clock of 80Mhz

21 */

23 MCF_CLOCK_SYNCR = MCF_CLOCK_SYNCR_MFD(3) | MCF_CLOCK_SYNCR_CLKSRC| MCF_CLOCK_SYNCR_PLLMODE | MCF_CLOCK_SYNCR_PLLEN ;

25 while (!(MCF_CLOCK_SYNSR & MCF_CLOCK_SYNSR_LOCK))

26 {

27 }

28 }

29 /********************************************************************/

30 static void scm_init(void)

31 {

32 /*

33 * Enable on-chip modules to access internal SRAM

34 */

35 MCF_SCM_RAMBAR = (0

36 | MCF_SCM_RAMBAR_BA(RAMBAR_ADDRESS)

37 | MCF_SCM_RAMBAR_BDE);

38 }

40 /********************************************************************/

42 /*

43 * Out of reset, the low-level assembly code calls this routine to

44 * initialize the mcf5206e for this board. A temporary stack has been

45 * setup in the internal SRAM, and the stack pointer will be changed

46 * to point to DRAM once this routine returns.

47 */

48 void __initialize_hardware(void)

49 {

50 /*******************************************************

51 * Out of reset, the low-level assembly code calls this

52 * routine to initialize the MCF52221 modules for the

53 * M522223EVB board.

54 ********************************************************/

57 asm

58 {

59 /* Initialize IPSBAR */

60 move.l #__IPSBAR,d0

61 andi.l #0xC0000000,d0 // need to mask

62 add.l #0x1,d0

63 move.l d0,0x40000000

67 /* Initialize FLASHBAR */

68 move.l #__FLASHBAR,d0

69 andi.l #0xFFF80000,d0 // need to mask

70 add.l #0x61,d0

71 movec d0,FLASHBAR

73 }

76 /* Set real time clock freq */

77 MCF_CLOCK_RTCDR = 48000000;

79 pll_init();

80 scm_init();

82 initialize_exceptions();

83 }