library

fat32

fat_chdir

change current directory

In: A, low byte of pointer to zero terminated string with the file path
X, high byte of pointer to zero terminated string with the file path
Out: C, C=0 on success (A=0), C=1 and A= otherwise
X, index into fd_area of the opened directory (which is FD_INDEX_CURRENT_DIR)

fat_close

close file, update dir entry and free file descriptor quietly

In: X, index into fd_area of the opened file
Out: C, 0 on success, 1 on error
A, error code

fat_fopen

open file

In: A, low byte of pointer to zero terminated string with the file path
X, high byte of pointer to zero terminated string with the file path
Y, file mode constants O_RDONLY = $01, O_WRONLY = $02, O_RDWR = $03, O_CREAT = $10, O_TRUNC = $20, O_APPEND = $40, O_EXCL = $80
Out: C, 0 on success, 1 on error
A, error code
X, index into fd_area of the opened file

fat_fread_byte

read byte from file

In: X, offset into fd_area
Out: C=0 on success and A=received byte, C=1 on error and A=error code or C=1 and A=0 (EOK) if EOF is reached

fat_fread_vollgas

read the file denoted by given file descriptor (X) until EOF and store data at given address (A/Y)

In: X - offset into fd_area
A/Y - pointer to target address
Out: C=0 on success, C=1 on error and A=error code or C=1 and A=0 (EOK) if EOF is reached

fat_fseek

seek n bytes within file denoted by the given FD

In: X - offset into fd_area
A/Y - pointer to seek_struct - @see fat32.inc
Out: C=0 on success (A=0), C=1 and A= or C=1 and A=0 (EOK) if EOF reached

fat_get_root_and_pwd

get current directory

In: A, low byte of address to write the current work directory string into
Y, high byte address to write the current work directory string into
X, size of result buffer pointet to by A/X
Out: C, 0 on success, 1 on error
A, error code

fat_mkdir

create directory denoted by given path in A/X

In: A, low byte of pointer to directory string
X, high byte of pointer to directory string
Out: C, 0 on success, 1 on error
A, error code

fat_mount

mount fat32 file system

Out: C, 0 on success, 1 on error
A, error code

fat_opendir

open directory by given path starting from directory given as file descriptor

In: A/X - pointer to string with the file path
Out: C, C=0 on success (A=0), C=1 and A= otherwise
X, index into fd_area of the opened directory

fat_read_direntry

read the block with the directory entry of the given file descriptor, dirptr is adjusted accordingly

In: X - file descriptor of the file the directory entry should be read
Out: C - C=0 on success (A=0), C=1 and A= otherwise
dirptr pointing to the corresponding directory entry of type F32DirEntry

fat_readdir

readdir expects a pointer in A/Y to store the next F32DirEntry structure representing the next FAT32 directory entry in the directory stream pointed of directory X.

In: X - file descriptor to fd_area of the directory
A/Y - pointer to target buffer which must be .sizeof(F32DirEntry)
Out: C - C = 0 on success (A=0), C = 1 and A = otherwise. C=1/A=EOK if end of directory is reached

fat_rmdir

delete a directory entry denoted by given path in A/X

In: A, low byte of pointer to directory string
X, high byte of pointer to directory string
Out: C, 0 on success, 1 on error
A, error code

fat_unlink

unlink (delete) a file denoted by given path in A/X

In: A, low byte of pointer to zero terminated string with the file path
X, high byte of pointer to zero terminated string with the file path
Out: C, C=0 on success (A=0), C=1 and A= otherwise

fat_update_direntry

update direntry given as pointer (A/Y) to FAT32 directory entry structure for file fd (X).

In: X - file descriptor to fd_area of the file
A/Y - pointer to direntry buffer with updated direntry data of type F32DirEntry
Out: C - C = 0 on success (A=0), C = 1 and A = otherwise. C=1/A=EOK if end of directory is reached

fat_write_byte

write byte to file

In: A, byte to write
X, offset into fs area
Out: C, 0 on success, 1 on error

joystick

joystick_detect | joystick_read |

joystick_detect

detect joystick

Out: Z, Z=1 no joystick detected, Z=0 joystick detected, port in A
A, detected joystick port, JOY_PORT1 or JOY_PORT2

joystick_read

read state of specified joystick

Out: A, joystick button state - bit 0-4

keyboard

fetchkey | getkey |

fetchkey

fetch byte from keyboard controller

Out: A, fetched key / error code
C, 1 - key was fetched, 0 - nothing fetched

getkey

get byte from keyboard buffer

Out: A, fetched key
C, 1 - key was fetched, 0 - nothing fetched

sdcard

sd_busy_wait

wait while sd card is busy

Out: C, C = 0 on success, C = 1 on error (timeout)
Clobbers: A,X,Y

sd_cmd

send command to sd card

In: A, command byte
sd_cmd_param, command parameters
Out: A, SD Card R1 status byte
Clobbers: A,X,Y

sd_deselect_card

Read block from SD Card

Out: A, error code
C, 0 - success, 1 - error
Clobbers: X

sd_read_block

Read block from SD Card

In: lba_addr, LBA address of block
sd_blkptr, target adress for the block data to be read
Out: A, error code
C, 0 - success, 1 - error
Clobbers: A,X,Y

sd_select_card

select sd card, pull CS line to low with busy wait

Out: C, C = 0 on success, C = 1 on error (timeout)
Clobbers: A,X,Y

sd_write_block

Write block to SD Card

In: lba_addr, LBA address of block
sd_blkptr, target adress for the block data to be read
Out: A, error code
C, 0 - success, 1 - error
Clobbers: A,X,Y

sdcard_init

initialize sd card in SPI mode

Out: Z,1 on success, 0 on error
A, error code
Clobbers: A,X,Y

spi

spi_deselect | spi_r_byte | spi_rw_byte | spi_select_device |

spi_deselect

deselect all SPI devices

spi_r_byte

read byte via SPI

Out: A, received byte
Clobbers: A,X

spi_rw_byte

transmit byte via SPI

In: A, byte to transmit
Out: A, received byte
Clobbers: A,X,Y

spi_select_device

select spi device given in A. the method is aware of the current processor state, especially the interrupt flag

In: ; A, spi device, one of devices see spi.inc
Out: Z = 1 spi for given device could be selected (not busy), Z=0 otherwise

uart

uart_init | uart_rx | uart_rx_nowait | uart_tx |

uart_init

initialize UART with parameters from nvram

Clobbers: A,X,Y

uart_rx

receive byte

Out: A, received byte

uart_rx_nowait

receive byte, no wait

Out: A, received byte
C, 0 - no byte received, 1 - received byte

uart_tx

send byte

In: A, byte to send

util

atoi

convert ascii digit to binary

In: A, value to convert
Out: A, binary number

b2ad

output 8bit value as 2 digit decimal

In: A, value to output

b2ad2

output 8bit value as 3 digit decimal

In: A, value to output

bin2dual

output 8bit value as binary string

In: A, value to output

hexout

output 8bit value as hex

In: A, value to convert

hextodec

8bit hex to decimal converter

In: A, value to convert
Out: A, ones
X, tens
Y, hundreds

strout

Output string on active output device

In: A, lowbyte of string address
X, highbyte of string address

vdp

gfx_circle

draw circle

In: A/Y - pointer to circle_t struct

gfx_line

draw line according to data in given line struct

In: A/Y ptr to line_t struct

gfx_plot

plot pixel

In: A/Y - pointer to plot_t struct

gfx_point

read pixel value

In: A/Y - pointer to plot_t struct
Out: Y - color of pixel at given plot_t

gfx_rectangle

draw a rectangle according to data in given rectangle struct

In: A/Y ptr to rectangle_t struct

ppm_load_image

In: A/X file name to load
Y vdp vram page to load ppm into - either 0 for address $00000 or 1 for address $10000
Out: C=0 success and image loaded to vram (mode 7), C=1 otherwise with A/X error code where X ppm specific error, A i/o specific error

vdp_bgcolor

In: A - color

vdp_cmd_hmmv

execute highspeed memory move (vdp/vram) or fill

In: A/X - ptr to rectangle coordinates (4 word with x1,y1, len x, len y)
Y - color to fill in (reg #44)

vdp_fill

fill vdp VRAM with given value page wise

In: A - byte to fill
X - amount of 256byte blocks (page counter)

vdp_fills

fill vdp VRAM with given value

In: A - value to write
X - amount of bytes

vdp_gfx1_blank

vdp_gfx1_on

gfx mode 1 - 32x24 character mode, 16 colors with same color for 8 characters in a block

vdp_gfx7_set_pixel_direct

In: X - x coordinate [0..ff]
Y - y coordinate [0..bf]
A - color GRB [0..ff] as 332

vdp_init_reg

setup video registers upon given table starting from register #R.X down to #R0

In: X - length of init table, corresponds to video register to start R#+X - e.g. X=10 start with R#10
A/Y - pointer to vdp init table

vdp_mc_blank

blank multi color mode, set all pixel to black

In: A - color to blank

vdp_mc_init_screen

init mc screen

vdp_mc_on

gfx multi color mode - 4x4px blocks where each can have one of the 15 colors

vdp_mc_set_pixel

set pixel to mc screen - VRAM ADDRESS = 8(INT(X DIV 2)) + 256(INT(Y DIV 8)) + (Y MOD 8)

In: X - x coordinate [0..3f]
Y - y coordinate [0..2f]
A - color [0..f]

vdp_memcpy

copy data from host memory denoted by pointer (A/Y) to vdp VRAM (page wise). the VRAM address must be setup beforehand e.g. with macro vdp_vram_w

In: X - amount of 256byte blocks (page counter)
A/Y - pointer to source data

vdp_memcpys

copy memory to vdp VRAM page wise

In: X - amount of bytes to copy
A/Y - pointer to data

vdp_mode2_blank

blank gfx mode 2 with

In: A - color to fill [0..f]

vdp_mode2_on

gfx 2 - each pixel can be addressed - e.g. for image

vdp_mode2_set_pixel

set pixel to gfx2 mode screen - VRAM ADDRESS = 8(INT(X DIV 8)) + 256(INT(Y DIV 8)) + (Y MOD 8)

In: X - x coordinate [0..ff]
Y - y coordinate [0..bf]
A - color [0..f]

vdp_mode3_on

mode 3 on

vdp_mode6_blank

blank gfx mode 6 with given color

In: Y - color to fill 4|4 Bit

vdp_mode6_on

gfx 6 - 512x192/212px, 16colors, sprite mode 2

vdp_mode6_set_pixel

set pixel to gfx6 mode screen - VRAM ADDRESS = 8(INT(X DIV 2)) + 256(INT(Y DIV 8)) + (Y MOD 8)

In: X - x coordinate [0..ff]
Y - y coordinate [0..bf]
A - color [0..f] and bit 7 MSB x coordinate

vdp_mode7_blank

blank gfx mode 7 with

In: Y - color to fill in GRB (3+3+2)

vdp_mode7_on

gfx 7 - each pixel can be addressed - e.g. for image

vdp_mode7_set_pixel

VRAM ADDRESS = .X + 256*.Y

In: X - x coordinate [0..ff]
Y - y coordinate [0..bf]
. A - color [0..ff] as GRB 332 (green bit 7-5, red bit 4-2, blue bit 1-0)

vdp_mode_sprites_off

vdp_set_reg

set value to vdp register

In: A - value
Y - register

vdp_text_blank

text mode blank screen and color vram

vdp_text_on

text mode - 40x24/80x24 character mode, 2 colors

In: A - color settings (#R07)

vdp_wait_cmd

wait until a pending command has been finished