From 67d25d837ac55f28a366c0a3b262e439a6e75fc3 Mon Sep 17 00:00:00 2001 From: Dimitri Sokolyuk Date: Sat, 19 Aug 2017 12:15:28 +0200 Subject: Add AmForth --- .../msp430/devices/msp430g2553/words/cold.asm | 41 ++++++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 amforth-6.5/msp430/devices/msp430g2553/words/cold.asm (limited to 'amforth-6.5/msp430/devices/msp430g2553/words/cold.asm') diff --git a/amforth-6.5/msp430/devices/msp430g2553/words/cold.asm b/amforth-6.5/msp430/devices/msp430g2553/words/cold.asm new file mode 100644 index 0000000..0828eb4 --- /dev/null +++ b/amforth-6.5/msp430/devices/msp430g2553/words/cold.asm @@ -0,0 +1,41 @@ +CODEHEADER(XT_COLD,4,"cold") +main: ; Debugger requires the 'main' symbol. +reset: + ; Watchdog Timer + MOV #(WDTPW+WDTHOLD),&WDTCTL ; stop watchdog timer + + ; Basic Clock Module + ; My thanks to the 4e4th team for the following two lines! + MOV.B &CALBC1_8MHZ, &BCSCTL1 ; Set DCO + MOV.B &CALDCO_8MHZ, &DCOCTL ; to 8 MHz. + + MOV.B #00h,&BCSCTL2 ; MCLK=DCO/1, SMCLK=DCO/1 + + ; Flash Memory Controller + ; Flash Timing Generator frequency must be 257-476 kHz. + ; 8 MHZ/17 = 470.59 kHz. tFTG=2.125 msec. + ; At 470 kHz, byte/word program time is 35*tFTG = 75 usec. + ; Cumulative program time to any 64-byte block (between erasures) + ; must not exceed 4 msec, thus 53 writes at 250 kHz. Therefore, + ; do not use exclusively byte writes in a 64-byte block. + ; Also, "a flash word (low + high byte) must not + ; be written more than twice between erasures." + ; Program/Erase endurance is 10,000 cycles minimum. + MOV #FWKEY+0,&FCTL1 ; write & erase modes OFF + MOV #FWKEY+FSSEL1+16,&FCTL2 ; SMCLK/17 = 471 kHz. + MOV #FWKEY+LOCK,&FCTL3 ; lock flash memory against writing + + ; Interrupt Enables + MOV.B #0,&IE1 ; no interrupts enabled + MOV.B #0,&IE2 ; no interrupts enabled + + ; Forth registers + MOV #RSTACK,SP ; set up stack + MOV #PSTACK,PSP + MOV #UAREA,UP ; initial user pointer + + CLR R15 + + ; now hand over to Forth with WARM (a colon word) + MOV #XT_WARM+2,IP + NEXT -- cgit v1.2.3