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user_io.c
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#include "AT91SAM7S256.h"
#include <stdio.h>
#include <string.h>
#include "hardware.h"
#include "osd.h"
#include "user_io.h"
#include "archie.h"
#include "cdc_control.h"
#include "usb.h"
#include "debug.h"
#include "keycodes.h"
#include "ikbd.h"
#include "fat.h"
#include "spi.h"
#include "mist_cfg.h"
// up to 16 key can be remapped
#define MAX_REMAP 16
unsigned char key_remap_table[MAX_REMAP][2];
#define BREAK 0x8000
fileTYPE sd_image;
extern fileTYPE file;
extern char s[40];
extern DIRENTRY DirEntry[MAXDIRENTRIES];
extern unsigned char iSelectedEntry;
extern unsigned char sort_table[MAXDIRENTRIES];
// mouse and keyboard emulation state
typedef enum { EMU_NONE, EMU_MOUSE, EMU_JOY0, EMU_JOY1 } emu_mode_t;
static emu_mode_t emu_mode = EMU_NONE;
static unsigned char emu_state = 0;
static unsigned long emu_timer = 0;
#define EMU_MOUSE_FREQ 5
// keep state over core type and its capabilities
static unsigned char core_type = CORE_TYPE_UNKNOWN;
static char core_type_8bit_with_config_string = 0;
// permanent state of adc inputs used for dip switches
static unsigned char adc_state = 0;
AT91PS_ADC a_pADC = AT91C_BASE_ADC;
AT91PS_PMC a_pPMC = AT91C_BASE_PMC;
// keep state of caps lock
static char caps_lock_toggle = 0;
// mouse position storage for ps2 and minimig rate limitation
#define X 0
#define Y 1
#define MOUSE_FREQ 20 // 20 ms -> 50hz
static int16_t mouse_pos[2] = { 0, 0};
static uint8_t mouse_flags = 0;
static unsigned long mouse_timer;
// set by OSD code to suppress forwarding of those keys to the core which
// may be in use by an active OSD
static char osd_is_visible = false;
char user_io_osd_is_visible() {
return osd_is_visible;
}
static void PollOneAdc() {
static unsigned char adc_cnt = 0xff;
// fetch result from previous run
if(adc_cnt != 0xff) {
unsigned int result;
// wait for end of convertion
while(!(AT91C_BASE_ADC->ADC_SR & (1 << (4+adc_cnt))));
switch (adc_cnt) {
case 0: result = AT91C_BASE_ADC->ADC_CDR4; break;
case 1: result = AT91C_BASE_ADC->ADC_CDR5; break;
case 2: result = AT91C_BASE_ADC->ADC_CDR6; break;
case 3: result = AT91C_BASE_ADC->ADC_CDR7; break;
}
if(result < 128) adc_state |= (1<<adc_cnt);
if(result > 128) adc_state &= ~(1<<adc_cnt);
}
adc_cnt = (adc_cnt + 1)&3;
// Enable desired chanel
AT91C_BASE_ADC->ADC_CHER = 1 << (4+adc_cnt);
// Start conversion
AT91C_BASE_ADC->ADC_CR = AT91C_ADC_START;
}
static void InitADC(void) {
// Enable clock for interface
AT91C_BASE_PMC->PMC_PCER = 1 << AT91C_ID_ADC;
// Reset
AT91C_BASE_ADC->ADC_CR = AT91C_ADC_SWRST;
AT91C_BASE_ADC->ADC_CR = 0x0;
// Set maximum startup time and hold time
AT91C_BASE_ADC->ADC_MR = 0x0F1F0F00 | AT91C_ADC_LOWRES_8_BIT;
// make sure we get the first values immediately
PollOneAdc();
PollOneAdc();
PollOneAdc();
PollOneAdc();
}
// poll one adc channel every 25ms
static void PollAdc() {
static long adc_timer = 0;
if(CheckTimer(adc_timer)) {
adc_timer = GetTimer(25);
PollOneAdc();
}
}
void user_io_init() {
// no sd card image selected, SD card accesses will go directly
// to the card
sd_image.size = 0;
// mark remap table as unused
memset(key_remap_table, 0, sizeof(key_remap_table));
InitADC();
ikbd_init();
}
unsigned char user_io_core_type() {
return core_type;
}
char minimig_v1() {
return(core_type == CORE_TYPE_MINIMIG);
}
char minimig_v2() {
return(core_type == CORE_TYPE_MINIMIG2);
}
char user_io_create_config_name(char *s) {
char *p = user_io_8bit_get_string(0); // get core name
if(p && p[0]) {
strcpy(s, p);
while(strlen(s) < 8) strcat(s, " ");
strcat(s, "CFG");
return 0;
}
return 1;
}
char user_io_is_8bit_with_config_string() {
return core_type_8bit_with_config_string;
}
void user_io_detect_core_type() {
EnableIO();
core_type = SPI(0xff);
DisableIO();
if((core_type != CORE_TYPE_DUMB) &&
(core_type != CORE_TYPE_MINIMIG) &&
(core_type != CORE_TYPE_MINIMIG2) &&
(core_type != CORE_TYPE_PACE) &&
(core_type != CORE_TYPE_MIST) &&
(core_type != CORE_TYPE_ARCHIE) &&
(core_type != CORE_TYPE_8BIT))
core_type = CORE_TYPE_UNKNOWN;
switch(core_type) {
case CORE_TYPE_UNKNOWN:
iprintf("Unable to identify core (%x)!\n", core_type);
break;
case CORE_TYPE_DUMB:
puts("Identified core without user interface");
break;
case CORE_TYPE_MINIMIG:
puts("Identified Minimig V1 core");
break;
case CORE_TYPE_MINIMIG2:
puts("Identified Minimig V2 core");
break;
case CORE_TYPE_PACE:
puts("Identified PACE core");
break;
case CORE_TYPE_MIST:
puts("Identified MiST core");
break;
case CORE_TYPE_ARCHIE:
puts("Identified Archimedes core");
archie_init();
break;
case CORE_TYPE_8BIT: {
puts("Identified 8BIT core");
// forward SD card config to core in case it uses the local
// SD card implementation
user_io_sd_set_config();
// check if core has a config string
core_type_8bit_with_config_string = (user_io_8bit_get_string(0) != NULL);
// send a reset
user_io_8bit_set_status(UIO_STATUS_RESET, UIO_STATUS_RESET);
// try to load config
user_io_create_config_name(s);
if(strlen(s) > 0) {
iprintf("Loading config %.11s\n", s);
if (FileOpen(&file, s)) {
iprintf("Found config\n");
if(file.size == 1) {
FileRead(&file, sector_buffer);
user_io_8bit_set_status(sector_buffer[0], 0xff);
}
}
// check if there's a <core>.rom present
strcpy(s+8, "ROM");
if (FileOpen(&file, s))
user_io_file_tx(&file, 0);
}
// release reset
user_io_8bit_set_status(0, UIO_STATUS_RESET);
} break;
}
}
void user_io_analog_joystick(unsigned char joystick, char valueX, char valueY) {
if(core_type == CORE_TYPE_8BIT) {
spi_uio_cmd8_cont(UIO_ASTICK, joystick);
spi8(valueX);
spi8(valueY);
DisableIO();
}
}
void user_io_digital_joystick(unsigned char joystick, unsigned char map) {
// if osd is open control it via joystick
if(osd_is_visible) {
static const uint8_t joy2kbd[] = {
OSDCTRLMENU, OSDCTRLMENU, OSDCTRLMENU, OSDCTRLSELECT,
OSDCTRLUP, OSDCTRLDOWN, OSDCTRLLEFT, OSDCTRLRIGHT };
static uint8_t last_map = 0;
// iprintf("joy to osd\n");
// OsdKeySet(0x80 | usb2ami[pressed[i]]);
return;
}
// iprintf("j%d: %x\n", joystick, map);
// "only" 6 joysticks are supported
if(joystick >= 6)
return;
// mist cores process joystick events for joystick 0 and 1 via the
// ikbd
if((core_type == CORE_TYPE_MINIMIG) ||
(core_type == CORE_TYPE_MINIMIG2) ||
(core_type == CORE_TYPE_PACE) ||
(core_type == CORE_TYPE_ARCHIE) ||
((core_type == CORE_TYPE_MIST) && (joystick >= 2)) ||
(core_type == CORE_TYPE_8BIT)) {
// joystick 3 and 4 were introduced later
spi_uio_cmd8((joystick < 2)?(UIO_JOYSTICK0 + joystick):((UIO_JOYSTICK2 + joystick - 2)), map);
}
// atari ST handles joystick 0 and 1 through the ikbd emulated by the io controller
if((core_type == CORE_TYPE_MIST) && (joystick < 2))
ikbd_joystick(joystick, map);
}
static char dig2ana(char min, char max) {
if(min && !max) return -128;
if(max && !min) return 127;
return 0;
}
void user_io_joystick(unsigned char joystick, unsigned char map) {
// digital joysticks also send analog signals
user_io_digital_joystick(joystick, map);
user_io_analog_joystick(joystick,
dig2ana(map&JOY_LEFT, map&JOY_RIGHT),
dig2ana(map&JOY_UP, map&JOY_DOWN));
}
// transmit serial/rs232 data into core
void user_io_serial_tx(char *chr, uint16_t cnt) {
spi_uio_cmd_cont(UIO_SERIAL_OUT);
while(cnt--) spi8(*chr++);
DisableIO();
}
char user_io_serial_status(serial_status_t *status_in, uint8_t status_out) {
uint8_t i, *p = (uint8_t*)status_in;
spi_uio_cmd_cont(UIO_SERIAL_STAT);
// first byte returned by core must be "magic". otherwise the
// core doesn't support this request
if(SPI(status_out) != 0xa5) {
DisableIO();
return 0;
}
// read the whole structure
for(i=0;i<sizeof(serial_status_t);i++)
*p++ = spi_in();
DisableIO();
return 1;
}
// transmit midi data into core
void user_io_midi_tx(char chr) {
spi_uio_cmd8(UIO_MIDI_OUT, chr);
}
// send ethernet mac address into FPGA
void user_io_eth_send_mac(uint8_t *mac) {
uint8_t i;
spi_uio_cmd_cont(UIO_ETH_MAC);
for(i=0;i<6;i++) spi8(*mac++);
DisableIO();
}
// set SD card info in FPGA (CSD, CID)
void user_io_sd_set_config(void) {
unsigned char data[33];
// get CSD and CID from SD card
MMC_GetCID(data);
MMC_GetCSD(data+16);
// byte 32 is a generic config byte
data[32] = MMC_IsSDHC()?1:0;
// and forward it to the FPGA
spi_uio_cmd_cont(UIO_SET_SDCONF);
spi_write(data, sizeof(data));
DisableIO();
// hexdump(data, sizeof(data), 0);
}
// read 8+32 bit sd card status word from FPGA
uint8_t user_io_sd_get_status(uint32_t *lba) {
uint32_t s;
uint8_t c;
spi_uio_cmd_cont(UIO_GET_SDSTAT);
c = spi_in();
s = spi_in();
s = (s<<8) | spi_in();
s = (s<<8) | spi_in();
s = (s<<8) | spi_in();
DisableIO();
if(lba)
*lba = s;
return c;
}
// read 32 bit ethernet status word from FPGA
uint32_t user_io_eth_get_status(void) {
uint32_t s;
spi_uio_cmd_cont(UIO_ETH_STATUS);
s = spi_in();
s = (s<<8) | spi_in();
s = (s<<8) | spi_in();
s = (s<<8) | spi_in();
DisableIO();
return s;
}
// read ethernet frame from FPGAs ethernet tx buffer
void user_io_eth_receive_tx_frame(uint8_t *d, uint16_t len) {
spi_uio_cmd_cont(UIO_ETH_FRM_IN);
while(len--) *d++=spi_in();
DisableIO();
}
// write ethernet frame to FPGAs rx buffer
void user_io_eth_send_rx_frame(uint8_t *s, uint16_t len) {
spi_uio_cmd_cont(UIO_ETH_FRM_OUT);
spi_write(s, len);
spi8(0); // one additional byte to allow fpga to store the previous one
DisableIO();
}
// the physical joysticks (db9 ports at the right device side)
// as well as the joystick emulation are renumbered if usb joysticks
// are present in the system. The USB joystick(s) replace joystick 1
// and 0 and the physical joysticks are "shifted up".
//
// Since the primary joystick is in port 1 the first usb joystick
// becomes joystick 1 and only the second one becomes joystick 0
// (mouse port)
static uint8_t joystick_renumber(uint8_t j) {
uint8_t usb_sticks = hid_get_joysticks();
// no usb sticks present: no changes are being made
if(!usb_sticks) return j;
if(j == 0) {
// if usb joysticks are present, then physical joystick 0 (mouse port)
// becomes becomes 2,3,...
j = usb_sticks + 1;
} else {
// if one usb joystick is present, then physical joystick 1 (joystick port)
// becomes physical joystick 0 (mouse) port. If more than 1 usb joystick
// is present it becomes 2,3,...
if(usb_sticks == 1) j = 0;
else j = usb_sticks;
}
return j;
}
// 16 byte fifo for amiga key codes to limit max key rate sent into the core
#define KBD_FIFO_SIZE 16 // must be power of 2
static unsigned short kbd_fifo[KBD_FIFO_SIZE];
static unsigned char kbd_fifo_r=0, kbd_fifo_w=0;
static long kbd_timer = 0;
static void kbd_fifo_minimig_send(unsigned short code) {
spi_uio_cmd8((code&OSD)?UIO_KBD_OSD:UIO_KEYBOARD, code & 0xff);
kbd_timer = GetTimer(50); // next key after 50ms earliest
}
static void kbd_fifo_enqueue(unsigned short code) {
// if fifo full just drop the value. This should never happen
if(((kbd_fifo_w+1)&(KBD_FIFO_SIZE-1)) == kbd_fifo_r)
return;
// store in queue
kbd_fifo[kbd_fifo_w] = code;
kbd_fifo_w = (kbd_fifo_w + 1)&(KBD_FIFO_SIZE-1);
}
// send pending bytes if timer has run up
static void kbd_fifo_poll() {
// timer enabled and runnig?
if(kbd_timer && !CheckTimer(kbd_timer))
return;
kbd_timer = 0; // timer == 0 means timer is not running anymore
if(kbd_fifo_w == kbd_fifo_r)
return;
kbd_fifo_minimig_send(kbd_fifo[kbd_fifo_r]);
kbd_fifo_r = (kbd_fifo_r + 1)&(KBD_FIFO_SIZE-1);
}
static void user_io_set_index(unsigned char index) {
EnableFpga();
SPI(UIO_FILE_INDEX);
SPI(index);
DisableFpga();
}
void user_io_file_mount(fileTYPE *file) {
iprintf("selected %.12s with %d bytes\n", file->name, file->size);
memcpy(&sd_image, file, sizeof(fileTYPE));
// notify core of possible sd image change
spi_uio_cmd8(UIO_SET_SDSTAT, 0);
}
void user_io_file_tx(fileTYPE *file, unsigned char index) {
unsigned long bytes2send = file->size;
/* transmit the entire file using one transfer */
iprintf("Selected file %.11s with %lu bytes to send for index %d\n", file->name, bytes2send, index);
// set index byte (0=bios rom, 1-n=OSD entry index)
user_io_set_index(index);
// send directory entry (for alpha amstrad core)
EnableFpga();
SPI(UIO_FILE_INFO);
spi_write((void*)(DirEntry+sort_table[iSelectedEntry]), sizeof(DIRENTRY));
DisableFpga();
// hexdump(DirEntry+sort_table[iSelectedEntry], sizeof(DIRENTRY), 0);
// prepare transmission of new file
EnableFpga();
SPI(UIO_FILE_TX);
SPI(0xff);
DisableFpga();
while(bytes2send) {
iprintf(".");
unsigned short c, chunk = (bytes2send>512)?512:bytes2send;
char *p;
FileRead(file, sector_buffer);
EnableFpga();
SPI(UIO_FILE_TX_DAT);
for(p = sector_buffer, c=0;c < chunk;c++)
SPI(*p++);
DisableFpga();
bytes2send -= chunk;
// still bytes to send? read next sector
if(bytes2send)
FileNextSector(file);
}
// signal end of transmission
EnableFpga();
SPI(UIO_FILE_TX);
SPI(0x00);
DisableFpga();
iprintf("\n");
}
// 8 bit cores have a config string telling the firmware how
// to treat it
char *user_io_8bit_get_string(char index) {
unsigned char i, lidx = 0, j = 0;
static char buffer[32+1]; // max 32 bytes per config item
// clear buffer
buffer[0] = 0;
spi_uio_cmd_cont(UIO_GET_STRING);
i = spi_in();
// the first char returned will be 0xff if the core doesn't support
// config strings. atari 800 returns 0xa4 which is the status byte
if((i == 0xff) || (i == 0xa4)) {
DisableIO();
return NULL;
}
// iprintf("String: ");
while ((i != 0) && (i!=0xff) && (j<sizeof(buffer))) {
if(i == ';') {
if(lidx == index) buffer[j++] = 0;
lidx++;
} else {
if(lidx == index)
buffer[j++] = i;
}
// iprintf("%c", i);
i = spi_in();
}
DisableIO();
// iprintf("\n");
// if this was the last string in the config string list, then it still
// needs to be terminated
if(lidx == index)
buffer[j] = 0;
// also return NULL for empty strings
if(!buffer[0])
return NULL;
return buffer;
}
unsigned char user_io_8bit_set_status(unsigned char new_status, unsigned char mask) {
static unsigned char status = 0;
// if mask is 0 just return the current status
if(mask) {
// keep everything not masked
status &= ~mask;
// updated masked bits
status |= new_status & mask;
spi_uio_cmd8(UIO_SET_STATUS, status);
}
return status;
}
void user_io_send_buttons(char force) {
static unsigned char key_map = 0;
// frequently poll the adc the switches
// and buttons are connected to
PollAdc();
unsigned char map = 0;
if(adc_state & 1) map |= SWITCH2;
if(adc_state & 2) map |= SWITCH1;
if(adc_state & 4) map |= BUTTON1;
if(adc_state & 8) map |= BUTTON2;
// TODO adding conf here
if (mist_cfg.scandoubler_disable)
map |= CONF_SCANDOUBLER_DISABLE;
if((map != key_map) || force) {
key_map = map;
spi_uio_cmd8(UIO_BUT_SW, map);
iprintf("sending keymap\n");
}
}
void user_io_poll() {
if(user_io_dip_switch1()) {
// check of core has changed from a good one to a not supported on
// as this likely means that the user is reloading the core via jtag
unsigned char ct;
static unsigned char ct_cnt = 0;
EnableIO();
ct = SPI(0xff);
DisableIO();
SPI(0xff); // needed for old minimig core
if(ct == core_type)
ct_cnt = 0; // same core type, everything is fine
else {
// core type has changed
if(++ct_cnt == 255) {
// wait for a new valid core id to appear
while((ct & 0xf0) != 0xa0) {
EnableIO();
ct = SPI(0xff);
DisableIO();
SPI(0xff); // needed for old minimig core
}
// reset io controller to cope with new core
*AT91C_RSTC_RCR = 0xA5 << 24 | AT91C_RSTC_PERRST | AT91C_RSTC_PROCRST; // restart
for(;;);
}
}
}
if((core_type != CORE_TYPE_MINIMIG) &&
(core_type != CORE_TYPE_MINIMIG2) &&
(core_type != CORE_TYPE_PACE) &&
(core_type != CORE_TYPE_MIST) &&
(core_type != CORE_TYPE_ARCHIE) &&
(core_type != CORE_TYPE_8BIT)) {
return; // no user io for the installed core
}
if(core_type == CORE_TYPE_MIST) {
char redirect = tos_get_cdc_control_redirect();
ikbd_poll();
// check for input data on usart
USART_Poll();
unsigned char c = 0;
// check for incoming serial data. this is directly forwarded to the
// arm rs232 and mixes with debug output. Useful for debugging only of
// e.g. the diagnostic cartridge
if(!pl2303_is_blocked()) {
spi_uio_cmd_cont(UIO_SERIAL_IN);
while(spi_in() && !pl2303_is_blocked()) {
c = spi_in();
// if a serial/usb adapter is connected it has precesence over
// any other sink
if(pl2303_present())
pl2303_tx_byte(c);
else {
if(c != 0xff)
putchar(c);
// forward to USB if redirection via USB/CDC enabled
if(redirect == CDC_REDIRECT_RS232)
cdc_control_tx(c);
}
}
DisableIO();
}
// check for incoming parallel/midi data
if((redirect == CDC_REDIRECT_PARALLEL) || (redirect == CDC_REDIRECT_MIDI)) {
spi_uio_cmd_cont((redirect == CDC_REDIRECT_PARALLEL)?UIO_PARALLEL_IN:UIO_MIDI_IN);
// character 0xff is returned if FPGA isn't configured
c = 0;
while(spi_in() && (c!= 0xff)) {
c = spi_in();
cdc_control_tx(c);
}
DisableIO();
// always flush when doing midi to reduce latencies
if(redirect == CDC_REDIRECT_MIDI)
cdc_control_flush();
}
}
// poll db9 joysticks
static int joy0_state = JOY0;
if((*AT91C_PIOA_PDSR & JOY0) != joy0_state) {
joy0_state = *AT91C_PIOA_PDSR & JOY0;
unsigned char joy_map = 0;
if(!(joy0_state & JOY0_UP)) joy_map |= JOY_UP;
if(!(joy0_state & JOY0_DOWN)) joy_map |= JOY_DOWN;
if(!(joy0_state & JOY0_LEFT)) joy_map |= JOY_LEFT;
if(!(joy0_state & JOY0_RIGHT)) joy_map |= JOY_RIGHT;
if(!(joy0_state & JOY0_BTN1)) joy_map |= JOY_BTN1;
if(!(joy0_state & JOY0_BTN2)) joy_map |= JOY_BTN2;
user_io_joystick(joystick_renumber(0), joy_map);
}
static int joy1_state = JOY1;
if((*AT91C_PIOA_PDSR & JOY1) != joy1_state) {
joy1_state = *AT91C_PIOA_PDSR & JOY1;
unsigned char joy_map = 0;
if(!(joy1_state & JOY1_UP)) joy_map |= JOY_UP;
if(!(joy1_state & JOY1_DOWN)) joy_map |= JOY_DOWN;
if(!(joy1_state & JOY1_LEFT)) joy_map |= JOY_LEFT;
if(!(joy1_state & JOY1_RIGHT)) joy_map |= JOY_RIGHT;
if(!(joy1_state & JOY1_BTN1)) joy_map |= JOY_BTN1;
if(!(joy1_state & JOY1_BTN2)) joy_map |= JOY_BTN2;
user_io_joystick(joystick_renumber(1), joy_map);
}
user_io_send_buttons(0);
// mouse movement emulation is continous
if(emu_mode == EMU_MOUSE) {
if(CheckTimer(emu_timer)) {
emu_timer = GetTimer(EMU_MOUSE_FREQ);
if(emu_state & JOY_MOVE) {
unsigned char b = 0;
char x = 0, y = 0;
if((emu_state & (JOY_LEFT | JOY_RIGHT)) == JOY_LEFT) x = -1;
if((emu_state & (JOY_LEFT | JOY_RIGHT)) == JOY_RIGHT) x = +1;
if((emu_state & (JOY_UP | JOY_DOWN)) == JOY_UP) y = -1;
if((emu_state & (JOY_UP | JOY_DOWN)) == JOY_DOWN) y = +1;
if(emu_state & JOY_BTN1) b |= 1;
if(emu_state & JOY_BTN2) b |= 2;
user_io_mouse(b, x, y);
}
}
}
if((core_type == CORE_TYPE_MINIMIG) ||
(core_type == CORE_TYPE_MINIMIG2)) {
kbd_fifo_poll();
// frequently check mouse for events
if(CheckTimer(mouse_timer)) {
mouse_timer = GetTimer(MOUSE_FREQ);
// has ps2 mouse data been updated in the meantime
if(mouse_flags & 0x80) {
spi_uio_cmd_cont(UIO_MOUSE);
// ----- X axis -------
if(mouse_pos[X] < -128) {
spi8(-128);
mouse_pos[X] += 128;
} else if(mouse_pos[X] > 127) {
spi8(127);
mouse_pos[X] -= 127;
} else {
spi8(mouse_pos[X]);
mouse_pos[X] = 0;
}
// ----- Y axis -------
if(mouse_pos[Y] < -128) {
spi8(-128);
mouse_pos[Y] += 128;
} else if(mouse_pos[Y] > 127) {
spi8(127);
mouse_pos[Y] -= 127;
} else {
spi8(mouse_pos[Y]);
mouse_pos[Y] = 0;
}
spi8(mouse_flags & 0x03);
DisableIO();
// reset flags
mouse_flags = 0;
}
}
}
if(core_type == CORE_TYPE_MIST) {
// do some tos specific monitoring here
tos_poll();
}
if(core_type == CORE_TYPE_8BIT) {
unsigned char c = 1, f, p=0;
// check for input data on usart
USART_Poll();
// check for serial data to be sent
// check for incoming serial data. this is directly forwarded to the
// arm rs232 and mixes with debug output.
spi_uio_cmd_cont(UIO_SIO_IN);
// status byte is 1000000A with A=1 if data is available
if((f = spi_in(0)) == 0x81) {
iprintf("\033[1;36m");
// character 0xff is returned if FPGA isn't configured
while((f == 0x81) && (c!= 0xff) && (c != 0x00) && (p < 8)) {
c = spi_in();
if(c != 0xff && c != 0x00)
iprintf("%c", c);
f = spi_in();
p++;
}
iprintf("\033[0m");
}
DisableIO();
// sd card emulation
{
static char buffer[512];
static uint32_t buffer_lba = 0xffffffff;
uint32_t lba;
uint8_t c = user_io_sd_get_status(&lba);
// valid sd commands start with "5x" to avoid problems with
// cores that don't implement this command
if((c & 0xf0) == 0x50) {
// debug: If the io controller reports and non-sdhc card, then
// the core should never set the sdhc flag
if((c & 3) && !MMC_IsSDHC() && (c & 0x04))
iprintf("WARNING: SDHC access to non-sdhc card\n");
// check if core requests configuration
if(c & 0x08) {
iprintf("core requests SD config\n");
user_io_sd_set_config();
}
// check if system is trying to access a sdhc card from
// a sd/mmc setup
// check if an SDHC card is inserted
if(MMC_IsSDHC()) {
static char using_sdhc = 1;
// SD request and
if((c & 0x03) && !(c & 0x04)) {
if(using_sdhc) {
// we have not been using sdhc so far?
// -> complain!
ErrorMessage(" This core does not support\n"
" SDHC cards. Using them may\n"
" lead to data corruption.\n\n"
" Please use an SD card <2GB!", 0);
using_sdhc = 0;
}
} else
// SDHC request from core is always ok
using_sdhc = 1;
}
if((c & 0x03) == 0x02) {
// only write if the inserted card is not sdhc or
// if the core uses sdhc
if((!MMC_IsSDHC()) || (c & 0x04)) {
uint8_t wr_buf[512];
if(user_io_dip_switch1())
iprintf("SD WR %d\n", lba);
// if we write the sector stored in the read buffer, then
// update the read buffer with the new contents
if(buffer_lba == lba)
memcpy(buffer, wr_buf, 512);
buffer_lba = 0xffffffff;
// Fetch sector data from FPGA ...
spi_uio_cmd_cont(UIO_SECTOR_WR);
spi_block_read(wr_buf);
DisableIO();
// ... and write it to disk
DISKLED_ON;
if(sd_image.size) {
FileSeek(&sd_image, lba, SEEK_SET);
FileWrite(&sd_image, wr_buf);
} else
MMC_Write(lba, wr_buf);
DISKLED_OFF;
}
}
if((c & 0x03) == 0x01) {
if(user_io_dip_switch1())
iprintf("SD RD %d\n", lba);
// are we using a file as the sd card image?
// (C64 floppy does that ...)
if(buffer_lba != lba) {
DISKLED_ON;
if(sd_image.size) {
FileSeek(&sd_image, lba, SEEK_SET);
FileRead(&sd_image, buffer);
} else {
// sector read
// read sector from sd card if it is not already present in
// the buffer
MMC_Read(lba, buffer);
}
buffer_lba = lba;
DISKLED_OFF;
}
if(buffer_lba == lba) {
// data is now stored in buffer. send it to fpga
spi_uio_cmd_cont(UIO_SECTOR_RD);
spi_block_write(buffer);
DisableIO();
// the end of this transfer acknowledges the FPGA internal
// sd card emulation
}
// just load the next sector now, so it may be prefetched
// for the next request already
DISKLED_ON;
if(sd_image.size) {
FileSeek(&sd_image, lba+1, SEEK_SET);
FileRead(&sd_image, buffer);
} else {
// sector read
// read sector from sd card if it is not already present in
// the buffer
MMC_Read(lba+1, buffer);
}
buffer_lba = lba+1;
DISKLED_OFF;
}
}
}
// frequently check ps2 mouse for events
if(CheckTimer(mouse_timer)) {
mouse_timer = GetTimer(MOUSE_FREQ);