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bootloader: reset X before wait

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kicer
2025-12-18 10:43:47 +08:00
parent b31d4a0a29
commit 511d0b36ed
1 changed files with 10 additions and 8 deletions
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18
scripts/bootloader.opt
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@@ -1,15 +1,16 @@
;; M Code
;; option O0 O1 N1 O2 N2 O3 N3 O4 N4 O5 N5
;; 4800 00 00 FF 00 FF 00 FF 00 FF 00 FF -- -- -- -- --
;; 03D0|4810 -- -- -- -- -- -- -- -- -- -- -- -- 00 03 DF A6
;; 03E0|4820 0D C7 52 32 C7 52 35 C7 52 31 5C 27 0D 72 0B 52
;; 03F0|4830 30 F8 3B 52 31 5F 4C 26 F1 81 72 CC 48 3E 80 04
;; 4800 00 00 ff 00 ff 00 ff 00 ff 00 ff -- -- -- -- --
;; 03D0|4810 -- -- -- -- -- -- -- -- -- -- -- -- 00 03 df a6
;; 03E0|4820 0d c7 52 32 c7 52 35 c7 52 31 5f 5c 27 0c 72 0b
;; 03F0|4830 52 30 f8 3b 52 31 4c 26 f1 81 72 cc 48 3e 80 04
;; UART1 register address definitions (STM8S103F3)
;; UART1 register address definitions
UART1_SR = 0x5230 ; Status register
UART1_DR = 0x5231 ; Data register
UART1_BRR1 = 0x5232 ; Baud rate register 1
UART1_CR2 = 0x5235 ; Control register 2
RAM_SIZE = 0x0400 ; Ram size (end of address)
;; Bootloader body (located in OPT reserved area 0x481C-0x483F)
@@ -34,15 +35,16 @@ _bootO_start:
;; Receive maximum 243-byte data block and push onto stack
_bootO_rx_byte:
clrw X ; [5F] Reset X (for timeout detection)
_bootO_rx_wait:
incw X ; [5C] Increment X, check for overflow (timeout detection)
jreq _bootO_exit ; [27 0D] If X overflows (receive timeout), exit
jreq _bootO_exit ; [27 0C] If X overflows (receive timeout), exit
;; Wait for data reception
btjf UART1_SR, #5, _bootO_rx_byte ;[72 0B 52 30 F8]
btjf UART1_SR, #5, _bootO_rx_wait;[72 0B 52 30 F8]
;; Data received, push onto stack
push UART1_DR ; [3B 52 31]
clrw X ; [5F] Reset X (for timeout detection)
inc A ; [4C] Increment A, used as receive counter
jrne _bootO_rx_byte ; [26 F1] If A is not 0, continue receiving