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| -rw-r--r-- | alarm/alarm.asm | 65 | ||||
| -rw-r--r-- | alarm/assign.rst | 25 |
2 files changed, 90 insertions, 0 deletions
diff --git a/alarm/alarm.asm b/alarm/alarm.asm new file mode 100644 index 0000000..dd094ed --- /dev/null +++ b/alarm/alarm.asm @@ -0,0 +1,65 @@ +; +;30h-39h hold the 7seg bit patterns + mov 30h, #11000000B + mov 31h, #11111001B + mov 32h, #10100100B + mov 33h, #10110000B + mov 34h, #10011001B + mov 35h, #10010010B + mov 36h, #10000010B + mov 37h, #10000111B + mov 38h, #10000000B + mov 39h, #10011000B + + mov +start: + + + +jmp start +;40h-42h hold the 3 digits to display + +display: + mov acc, 50h + mov b, #1000 + div ab + mov 40h, acc + mov acc, b + mov b, #100 + div ab + mov 41h, acc; save 100's digit + mov acc, b ;put remainder in a + mov b, #10 ;find 10's & 1's digit + div ab + mov 42h, acc ;save 10's digit + mov 43h, b ;save 1's digit + + + +;display: + mov r1, #40h ;digits[0] + +loop: ;for each digit + mov acc, #30h + mov r3, acc ;save acc;next blob: + +;safe if you don't care about the +;bits of P3 other than p3.3 & p3.4 + mov a, r1 ;picks which + cpl a ;7seg to use p3.3 & + anl a, #03h ;p3.4 are a func + rl a ;of the low2 bits of + rl a ;the addr where the + rl a ;digits live + mov p1, #0ffh;undraw previous + mov p3, a ;set new 7seg + mov a, r3 ;restore acc + +; p1 = pattern[digit[i]] + add a, @r1 + mov r0, acc + mov p1, @r0 + inc r1 +; mov p1, #0ffh + cjne r1, #44h, loop + ret diff --git a/alarm/assign.rst b/alarm/assign.rst new file mode 100644 index 0000000..f9c802a --- /dev/null +++ b/alarm/assign.rst @@ -0,0 +1,25 @@ +=========== +Alarm clock +=========== + +Write an 8051 program which implements an alarm clock. This project will +have two phases, the first of which is described here. The alarm clock +runs all the time, with the current time displayed on the four 7-segment +displays. In this first phase your clock needs to: + 1. use timers to keep time updated to the second + 2. switch between 12 hour and 24 hour modes based switch bank.0 (0==12 + hr, 1==24hr) + 3. if you are in 12 hour mode, use the decimal point on the last + 7-segment display to indicate AM or PM (off = AM, on == PM) + 4. switch between display of hours:minutes and minutes:seconds based on + switch bank.1 (0==hours:minutes, 1==minutes:seconds) + 5. keep the decimal point of the second 7-segment display lit as a + visual separator + +AM/PM should remain indicated regardless of which display mode you are +using. + +You do not (yet) need to be able to: + - set the time (pick a starting value) + - set an alarm time + - perform an alarm |