projects / z180-stamp-cpm3.git / blame
| Commit | Line | Data |
|---|---|---|
| d6829fd3 L |
1 | |
| 2 | public as_init | |
| 3 | ||
| 4 | extrn ioiniml | |
| 5 | extrn f_cpu,add_hla,div32_r | |
| 6 | extrn @ctbl | |
| 7 | ||
| 8 | include config.inc | |
| 9 | include z180reg.inc | |
| 10 | ||
| 11 | ||
| 12 | ;-------------------------------------------------------------- | |
| 13 | ; TC = (f PHI /(2*baudrate*Clock_mode)) - 2 | |
| 14 | ; | |
| 15 | ; Clock_mode == 16 | |
| 16 | ; TC = (f PHI / (32 * baudrate)) - 2 | |
| 17 | ; | |
| 18 | ; br150 = baudrate/150 | |
| 19 | ; TC = (f PHI / (32 * 150 * br150)) - 2 | |
| 20 | ; TC = (f PHI / (32 * 150 * br150)) - 2 | |
| 21 | ||
| 22 | ||
| 23 | ;-------------------------------------------------------------- | |
| 24 | ; Init Serial I/O for console input and output (ASCI1) | |
| 25 | ; | |
| 26 | ; b: device number (0..15) | |
| 27 | ; c: asci channel number (0/1) | |
| 28 | ||
| 29 | dseg | |
| 30 | as_init: | |
| 31 | ld hl,initab0 | |
| 32 | dec c | |
| 33 | jr nz,$+5 | |
| 34 | ld hl,initab1 | |
| 35 | ||
| 46c2044d | 36 | push hl ;save initab addr |
| d6829fd3 L |
37 | ld c,8 ; |
| 38 | mlt bc ; | |
| 39 | ld hl,@ctbl+7 ;get baudrate index | |
| 40 | add hl,bc ; | |
| 41 | ld a,(hl) | |
| 42 | and 0fh | |
| 43 | add a,a ;get factor | |
| 44 | ld hl,bd150_tab | |
| 45 | call add_hla | |
| 46 | ld c,(hl) | |
| 47 | inc hl | |
| 48 | ld b,(hl) | |
| 49 | ld hl,(f_cpu) | |
| 50 | ld de,(f_cpu+2) | |
| 51 | call div32_r | |
| 52 | ld bc,32*150 | |
| 53 | call div32_r | |
| 54 | ld de,2 | |
| 55 | or a | |
| 56 | sbc hl,de | |
| 57 | jr nc,as_ini_1 | |
| 58 | ld hl,0 | |
| 59 | as_ini_1: | |
| 60 | ld b,h | |
| 61 | ld c,l | |
| 46c2044d | 62 | pop de ;get back initab addr |
| d6829fd3 L |
63 | ld hl,init_br_off |
| 64 | add hl,de | |
| 65 | ld (hl),c | |
| 66 | inc hl | |
| 67 | ld (hl),b | |
| 68 | ex de,hl | |
| 69 | jp ioiniml | |
| 70 | ||
| 71 | ||
| 72 | bd150_tab: | |
| 73 | ; factor index baudrate orig. cp/m | |
| 74 | dw 19200/150 ; 0 19200 - | |
| 75 | dw 28800/150 ; 1 28800 50 | |
| 76 | dw 38400/150 ; 2 38400 75 | |
| 77 | dw 57600/150 ; 3 57600 110 | |
| 78 | dw 11520/15 ; 4 115200 134.5 | |
| 79 | dw 150/150 ; 5 150 | |
| 80 | dw 300/150 ; 6 300 | |
| 81 | dw 600/150 ; 7 600 | |
| 82 | dw 1200/150 ; 8 1200 | |
| 83 | dw 1800/150 ; 9 1800 | |
| 84 | dw 2400/150 ;10 2400 | |
| 85 | dw 3600/150 ;11 3600 | |
| 86 | dw 4800/150 ;12 4800 | |
| 87 | dw 7200/150 ;13 7200 | |
| 88 | dw 9600/150 ;14 9600 | |
| 89 | dw 19200/150 ;15 19200 | |
| 90 | ||
| 91 | ||
| 92 | ||
| 93 | ||
| 94 | initab0: | |
| 95 | db 1,stat0,0 ;Disable rx/tx interrupts | |
| 96 | ;Enable baud rate generator | |
| b8ad769f | 97 | db 1,asext0,M_BRGMOD+M_DCD0DIS ; +M_CTS0DIS |
| d6829fd3 L |
98 | db 2,astc0l |
| 99 | init_br_off equ $ - initab0 | |
| 100 | dw 28 | |
| 101 | db 1,cntlb0,M_MPBT ;No MP Mode, X16 | |
| 102 | db 1,cntla0,M_RE+M_TE+M_MOD2 ;Rx/Tx enable, 8N1 | |
| 103 | db 0 | |
| 104 | ||
| 105 | initab1: | |
| 106 | db 1,stat1,0 ;Disable rx/tx ints, disable CTS1 | |
| 107 | db 1,asext1,M_BRGMOD ;Enable baud rate generator | |
| 108 | db 2,astc1l,low 3, high 3 | |
| 109 | db 1,cntlb1,M_MPBT ;No MP Mode, X16 | |
| 110 | db 1,cntla1,M_RE+M_TE+M_MOD2 ;Rx/Tx enable, 8N1 | |
| 111 | db 0 | |
| 112 | ||
| 113 | end |