Apple-1-HW/apple1serial
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omitted bytes fix

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This commit is contained in:
Piotr Jaczewski 2020-12-14 22:22:46 +01:00
parent a7c69a9964
commit dd4c67fa68
3 changed files with 26 additions and 21 deletions
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1
build.sh
View File

@ -1,4 +1,3 @@
#!/bin/sh
xa -W -C -v -O ASCII -S -c src/apple1serial.xa -l apple1serial.label -o apple1serial.bin
#xa -W -C -v -O ASCII -S -c src/serialmonitor.xa -l serialmonitor.label -o serialmonitor.bin

18
firmware/main.c
View File

@ -21,21 +21,21 @@
#define DATA6 PD3
#define DATA7 PD4
#define BUFFER_SIZE 8
#define BUFFER_SIZE 100
typedef enum {NONE, READ, WRITE} mode_t;
mode_t mode = NONE;
volatile mode_t mode = NONE;
uint8_t data = 0x00;
uint8_t upper_part = 0x00;
uint8_t lower_part = 0x00;
volatile uint8_t data = 0x00;
volatile uint8_t upper_part = 0x00;
volatile uint8_t lower_part = 0x00;
uint8_t data_write_interrupt_count = 0;
uint8_t data_read_interrupt_count = 0;
volatile uint8_t data_write_interrupt_count = 0;
volatile uint8_t data_read_interrupt_count = 0;
// receive buffer
uint8_t receive_buffer[BUFFER_SIZE];
int8_t receive_index = -1;
volatile uint8_t receive_buffer[BUFFER_SIZE];
volatile int8_t receive_index = -1;
// Registers: PCMSK0, PCMSK1, PCMSK2 :registers that enable or disable pin-change interrupts
// on individual pins

26
src/apple1serial.xa
View File

@ -147,7 +147,10 @@ read
beq read_ready
lda serial_read ;Enable read mode, this can be done quick, without reset
read_ready
txa ;Preserve X on stack
pha
ldy #$00
ldx #hex2_l
read_byte
lda serial_ready
@ -165,15 +168,14 @@ read_byte
lda #last_command_read ;Set last command to READ
sta last_command
pla ;Restore X from stack
tax
jmp next_cmd ;Read is completed, proceed to next command
read_next
txa ;Preserve X on stack
pha
ldx #hex2_l
jsr increment_16bit ;Increment destination address
pla ;Restore X from stack
tax
jmp read_byte
;-------------------------------------------------------------------------
@ -189,6 +191,9 @@ write
;and prevents from polluting the output while setting the write mode
sta serial_write ;Enable write mode
write_ready
txa ;Preserve X on stack
pha
ldx #hex2_l
ldy #$00
write_byte
@ -207,15 +212,14 @@ write_byte
lda #last_command_write ;Set last command to WRITE
sta last_command
pla ;Restore X from stack
tax
jmp next_cmd ;Write is completed, proceed to next command
write_next
txa ;Preserve X on stack
pha
ldx #hex2_l
jsr increment_16bit ;Increment destination address
pla ;Restore X from stack
tax
jmp write_byte
;-------------------------------------------------------------------------
@ -247,11 +251,13 @@ reset_loop ; ~((2 + 2 + 3) * 255 + 2 + 3) * 255 =
rts
increment_16bit
txa
inc $00,X
bne increment_16bit_done
inx
inc $00,X
increment_16bit_done
tax
rts
;-------------------------------------------------------------------------