1 ;======================================================================
3 ; common macros & equs etc.
4 ; generally include this at the top of each file.
6 ;----------------------------------------------------------------------
7 ; COMMON INCLUDES and BOILERPLATE
8 include /usr/share/gputils/header/p18f458.inc
11 include morse+auto.inc
12 include ../iwjpictest/insn-aliases.inc
14 include ../iwjpictest/clockvaries.inc
15 include variables+vars.inc
17 include program+clocks.inc
19 ;----------------------------------------------------------------------
20 ; Common conventions for function register notation:
25 ; STATUS Trashed Trashed
26 ; BSR Not used Not used
28 ; TBLPTR*,TABLAT Low ISR Low ISR
29 ; PROD* Low ISR Low ISR
30 ; FSR0 Low ISR Low ISR
31 ; PCLATU Always set to 0 Not used
32 ; PCLATH Low ISR Not used
33 ; t_dolocal Low ISR High ISR
34 ; FSR1 Low ISR High ISR (detect[1])
35 ; FSR2 Low ISR High ISR (detect[1])
37 ; Trashed May be trashed by any routine anywhere. Saved
38 ; during every ISR entry/exit.
40 ; Low ISR May be used/traashed by any routine run in low-priority
41 ; interrupt, or any routine run during initialisation.
42 ; May therefore not be used in background loop with
43 ; interrupts enabled. May not be used by high-priority
44 ; ISR (unless explicitly saved, eg isrh_fsr0_{save,restore}).
46 ; High ISR May be used/trashed by any routine run in high-priority
47 ; interrupt, or any routine run during initialisation.
48 ; May therefore not be used elsewhere with interrupts
51 ; Only the routines specially noted as intended to
52 ; be called from the High ISR are safe.
55 ; Register is reserved for use by this subsystem, which
56 ; is allowed to expect the value to be preserved.
57 ; Anything else which uses it must save and restore (and
58 ; may also need to disable interrupts, depending on its
61 ; Not High May be used by any routine not running in high-priority
62 ; interrupt. Not saved by high-priority interrupt
63 ; entry/exit, so any high-priority interrupt routine which
64 ; uses this register must save and restore it.
66 ; A routine which is allowed to trash a register may document that it
67 ; saves that register for the benefit of its callers.
69 ; [1] FSR1 and FSR2 on slave pics are reserved exclusively for the
70 ; I2C response and detection code (detect.asm), after det_slave_init.
72 ; General-purpose hardware allocation:
75 ; Timer 0 nmra Disabled
77 ; Timer 1 (1ms tick, int. low) (1ms tick, int. low)
78 ; CCP1 (1ms tick, int. low) (1ms tick, int. low)
79 ; Timer 3 point fire timer point fire timer
82 ; (...) indicates that this is a projected use, NYI
84 ;----------------------------------------------------------------------
85 ; Conventional routine names:
87 ; <periph>_local_do Process a master-to-slave command to activate
88 ; a local peripheral, in High ISR. Also called
89 ; on master in Low ISR to activate its own
90 ; local peripherals. NB strange calling convention!
92 ; <periph>_local_init Initialises RAM tables for local peripheral
93 ; and arranges for pins to be set in appropriate
94 ; quiescent state. Configures pic built-in
97 ; <periph>_local_intrl Low ISR service routine for peripheral (see below).
99 ; command_<periph> Called when an appropriate message has been
100 ; received from the host.
102 ; <something>_intrl Low ISR service routine.
103 ; Checks for any relevant interrupt.
104 ; If not, just returns.
105 ; If found, services it and then does either
106 ; intrl_handled or intrl_handled_nostack
107 ; neither of which return; the latter is
108 ; faster but implies a promise
110 ;----------------------------------------------------------------------
113 ;----------------------------------------
114 ; For entering and leaving Low ISR, saving and restoring STATUS and W
115 ; See above under <something>_intrl, and {master,slave}_interrupt_low
117 enter_interrupt_low macro
118 mov_ff STATUS, isr_low_save_status
119 mov_wf isr_low_save_w
120 mov_ff STKPTR, isr_low_save_stkptr
123 intrh_fsr0_save macro
124 mov_ff FSR0L, isr_high_save_fsr0
125 mov_ff FSR0H, isr_high_save_fsr0+1
128 intrh_fsr0_restore macro
129 mov_ff isr_high_save_fsr0, FSR0L
130 mov_ff isr_high_save_fsr0+1, FSR0H
133 intrl_handled_core macro ; for internal use only
134 mov_fw isr_low_save_w
135 mov_ff isr_low_save_status, STATUS
139 intrl_handled_nostack macro
140 pop ; undo the `call' from the original ISR
145 goto intrl_handled_routine
148 ;----------------------------------------
149 ; For disabling all interrupts, to make a critical section:
150 ; (for use from main program and Low ISR only)
152 ; GIEH modified appropriately
153 ; everything else preserved
163 ;----------------------------------------
164 ; For the fix specified in the silicon errata:
165 ; silicon revision B4 issue 4
168 ; TABLAT any data from flash
169 ; TBLPTR* correct incremented/decremented
170 ; everything else any preserved
172 tblrd_postinc_fixup macro
177 tblrd_postdec_fixup macro
182 ;----------------------------------------
183 ; For setting up TBLPTR according to the picno
185 load_perpic_tblptr macro flash_map_base, perpic_entry_size
189 ; W, STATUS, PROD* any undefined
190 ; everything else any preserved
192 mov_lw perpic_entry_size
195 mov_lw flash_map_base & 0xff
199 mov_lw flash_map_base >> 8
203 clr_f TBLPTRU ; TBLPTR* -> our point data
206 ;----------------------------------------------------------------------
209 ; A PINSPEC is a constant 0x<bit><port> where <port> is a b c d e
210 ; and <port> is 0 1 2 3 4 5 6 7. Generally p<picno>_<subsystem>_<pin>
211 ; are equ'd for this.
216 p0_booster_shutdown equ 2b
217 p0_booster_overload equ 1b
218 p0_booster_userfault equ 0b
221 p0_rs232_fcout equ 5c
222 pall_perpicled equ 2d
223 pall_pt0reverse equ 7b
225 p0_booster_dirn equ 0c
226 p0_booster_pwm equ 1c
230 ; LAT* may be subject to read-modify-write, see below
231 ; TRIS* may be subject to read-modify-write, see below
232 ; PORT* may be read, see below
233 ; everything else untouched
235 ; LAT*<bit> TRIS*<bit> PORT*
236 ; pin_z untouched set untouched
237 ; pin_h set cleared untouched
238 ; pin_l cleared cleared untouched
239 ; pin_nz untouched cleared untouched
240 ; pin_vh set untouched untouched
241 ; pin_vl cleared untouched untouched
242 ; pin_ifh untouched untouched read
243 ; pin_ifl untouched untouched read
246 bs_f TRISA + (TRISB-TRISA)*((pinspec-0xa) & 15), pinspec >> 4
250 bc_f TRISA + (TRISB-TRISA)*((pinspec-0xa) & 15), pinspec >> 4
254 bs_f LATA + (LATB-LATA)*((pinspec-0xa) & 15), pinspec >> 4
258 bc_f LATA + (LATB-LATA)*((pinspec-0xa) & 15), pinspec >> 4
271 pin_ifh macro pinspec
272 bt_f_if1 PORTA + (PORTB-PORTA)*((pinspec-0xa) & 15), pinspec >> 4
275 pin_ifl macro pinspec
276 bt_f_if0 PORTA + (PORTB-PORTA)*((pinspec-0xa) & 15), pinspec >> 4
279 ;----------------------------------------------------------------------