+/*
+ * (C) Copyright 2014 Leo C. <erbl259-lmu@yahoo.de>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
/**
*
* Pin assignments
*
- * | Z180-Sig | AVR-Port | Dir | Special Function |
+ * | Z180-Sig | AVR-Port | Dir | Special Function |
* +------------+---------------+-------+-----------------------+
- * | A0 | PA 0 | O | |
- * | A1 | PA 1 | O | |
- * | A2 | PA 2 | O | |
- * | A3 | PA 3 | O | |
- * | A4 | PA 4 | O | |
- * | A5 | PA 5 | O | |
- * | A6 | PA 6 | O | |
- * | A7 | PA 7 | O | |
- * | A8 | PC 0 | O | |
- * | A9 | PC 1 | O | |
- * | A10 | PC 2 | O | |
- * | A11 | PC 3 | O | |
- * | A12 | PC 4 | O | |
- * | A13 | PC 5 | O | |
- * | A14 | PC 6 | O | |
- * | A15 | PC 7 | O | |
- * | A16 | PE 2 | O | |
- * | A17 | PE 3 | O | |
- * | A18 | PE 4 | O | |
- * | D0 | PF 0 | I/O | |
- * | D1 | PF 1 | I/O | |
- * | D2 | PF 2 | I/O | |
- * | D3 | PF 3 | I/O | |
- * | D4 | PF 4 | I/O | |
- * | D5 | PF 5 | I/O | |
- * | D6 | PF 6 | I/O | |
- * | D7 | PF 7 | I/O | |
- * | RD | PD 3 | O | |
- * | WR | PD 2 | O | |
- * | MREQ | PD 4 | O | |
- * | RST | PD 5 | O | |
- * | BUSREQ | PD 7 | O | |
- * | BUSACK | PD 6 | I | |
- * | IOCS1 | PE 5 | I | |
- * |* HALT | P | | |
- * |* NMI | P | | |
- * | | P | | |
- * | | P | | af1 USART1_TX |
- * | | P | | af1 USART1_RX |
- * | | P |JTDI | remap SPI1_NSS' |
- * | | P |JTDO | remap SPI1_SCK' |
- * | | P |JTRST | remap SPI1_MISO' |
- * | | P | | remap SPI1_MOSI' |
- * | | P | | af1 OSC32 |
- * | | P | | af1 OSC32 |
-
+ * | A0 | PA 0 | O | |
+ * | A1 | PA 1 | O | |
+ * | A2 | PA 2 | O | |
+ * | A3 | PA 3 | O | |
+ * | A4 | PA 4 | O | |
+ * | A5 | PA 5 | O | |
+ * | A6 | PA 6 | O | |
+ * | A7 | PA 7 | O | |
+ * | A8 | PC 0 | O | |
+ * | A9 | PC 1 | O | |
+ * | A10 | PC 2 | O | |
+ * | A11 | PC 3 | O | |
+ * | A12 | PC 4 | O | |
+ * | A13 | PC 5 | O | |
+ * | A14 | PC 6 | O | |
+ * | A15 | PC 7 | O | |
+ * | A16 | PE 2 | O | |
+ * | A17 | PE 3 | O | |
+ * | A18 | PE 4 | O | |
+ * | D0 | PF 0 | I/O | |
+ * | D1 | PF 1 | I/O | |
+ * | D2 | PF 2 | I/O | |
+ * | D3 | PF 3 | I/O | |
+ * | D4 | PF 4 | I/O | |
+ * | D5 | PF 5 | I/O | |
+ * | D6 | PF 6 | I/O | |
+ * | D7 | PF 7 | I/O | |
+ * | RD | PD 3 | O | |
+ * | WR | PD 2 | O | |
+ * | MREQ | PD 4 | O | |
+ * | RST | PD 5 | O | |
+ * | BUSREQ | PD 7 | O | |
+ * | BUSACK | PD 6 | I | |
+ * | IOCS1 | PE 5 | I | |
+ * |* HALT | P | | |
+ * |* NMI | P | | |
+ * | | P | | |
+ * | | P | | af1 USART1_TX |
+ * | | P | | af1 USART1_RX |
+ * | | P |JTDI | remap SPI1_NSS' |
+ * | | P |JTDO | remap SPI1_SCK' |
+ * | | P |JTRST | remap SPI1_MISO' |
+ * | | P | | remap SPI1_MOSI' |
+ * | | P | | af1 OSC32 |
+ * | | P | | af1 OSC32 |
*/
-#include <avr/io.h>
-#include <util/delay.h>
+
+#include "common.h"
#include <util/atomic.h>
-#include <stdio.h>
#include "debug.h"
#include "z80-if.h"
-/* Number of array elements */
-#define NELEMS(x) (sizeof x/sizeof *x)
-
-
-#define CONCAT(x,y) x ## y
-#define EVALUATOR(x,y) CONCAT(x,y)
-
-#define GPIO_(X) CONCAT(GPIO, X)
-
-struct bits {
- uint8_t b0:1;
- uint8_t b1:1;
- uint8_t b2:1;
- uint8_t b3:1;
- uint8_t b4:1;
- uint8_t b5:1;
- uint8_t b6:1;
- uint8_t b7:1;
-} __attribute__((__packed__));
-
-#define SBIT(port,pin) ((*(volatile struct bits*)&port).b##pin)
-
-
+//#define P_ZCLK PORTB
+//#define ZCLK 5
+//#define DDR_ZCLK DDRB
#define P_MREQ PORTD
#define MREQ 4
#define DDR_MREQ DDRD
//#define ADB_PORT PORTE
+//#define Z80_O_ZCLK SBIT(P_ZCLK, 5)
#define Z80_O_MREQ SBIT(P_MREQ, 4)
#define Z80_O_RD SBIT(P_RD, 3)
#define Z80_O_WR SBIT(P_WR, 2)
//#define Z80_I_HALT SBIT(P_HALT, )
+#define BUS_TO 20
+
+
#define MASK(n) ((1<<(n))-1)
#define SMASK(w,s) (MASK(w) << (s))
-
typedef union {
uint32_t l;
uint16_t w[2];
static zstate_t zstate;
+static volatile uint8_t timer; /* used for bus timeout */
+
+/*---------------------------------------------------------*/
+/* 10Hz timer interrupt generated by OC4A */
+/*---------------------------------------------------------*/
+
+ISR(TIMER4_COMPA_vect)
+{
+
+ uint8_t i = timer;
+
+ if (i)
+ timer = i - 1;
+}
/*--------------------------------------------------------------------------*/
-static void z80_setup_addrbus_tristate(void)
+static void z80_addrbus_set_tristate(void)
{
/* /MREQ, /RD, /WR: Input, no pullup */
DDR_MREQ &= ~(_BV(MREQ) | _BV(RD) | _BV(WR));
DDR_ADB = DDR_ADB & ~(MASK(ADB_WIDTH) << ADB_SHIFT);
}
-
-static void z80_setup_addrbus_active(void)
+
+static void z80_addrbus_set_active(void)
{
/* /MREQ, /RD, /WR: Output and high */
Z80_O_MREQ = 1;
}
-
-static void z80_setup_dbus_in(void)
+static void z80_dbus_set_in(void)
{
DDR_DB = 0;
P_DB = 0;
}
-static void z80_setup_dbus_out(void)
+
+static void z80_dbus_set_out(void)
{
DDR_DB = 0xff;
}
+
+static void z80_reset_pulse(void)
+{
+ Z80_O_RST = 0;
+ _delay_us(10);
+ Z80_O_RST = 1;
+}
+
+
void z80_setup_bus(void)
{
/* /ZRESET: Output and low */
DDR_IOCS1 &= ~_BV(IOCS1);
P_IOCS1 &= ~_BV(IOCS1);
- z80_setup_addrbus_tristate();
- z80_setup_dbus_in();
+ z80_addrbus_set_tristate();
+ z80_dbus_set_in();
zstate = RESET;
-// Stat &= ~S_Z180_RUNNING;
-}
-/*--------------------------------------------------------------------------*/
-#if 0
- switch (zstate) {
- case RESET:
- break;
- case RESET_AQRD:
- break;
- case RUN:
- break;
- case RUN_AQRD:
- break;
- }
-#endif
-/*--------------------------------------------------------------------------*/
+ /* Timer 4 */
+ PRR1 &= ~_BV(PRTIM4);
+ OCR4A = F_CPU / 1024 / 10 - 1; /* Timer: 10Hz interval (OC4A) */
+ TCCR4B = (0b01<<WGM42)|(0b101<<CS30); /* CTC Mode, Prescaler 1024 */
+ TIMSK4 = _BV(OCIE4A); /* Enable oca interrupt */
-#if 0
-void z80_busreq(level_t level)
-{
- Z80_O_BUSREQ = level;
-}
-
-int z80_stat_reset(void)
-{
-// return Z80_O_RESET;
-}
-
-int z80_stat_halt(void)
-{
- return Z80_I_HALT;
}
-#endif
-zstate_t z80_runstate(void)
+zstate_t z80_bus_state(void)
{
return zstate;
}
-void z80_reset(void)
-{
-#if DEBUG
- zstate_t old = zstate;
-#endif
- z80_setup_dbus_in();
- z80_setup_addrbus_tristate();
- Z80_O_RST = 0;
- Z80_O_BUSREQ = 1;
- zstate = RESET;
- debug("z80_reset: state: %02x --> %02x\n", old, zstate);
-}
-
-void z80_reset_pulse(void)
+static void z80_busreq_hpulse(void)
{
-#if DEBUG
- zstate_t old = zstate;
-#endif
- switch (zstate) {
- case RESET:
- case RESET_AQRD:
- break;
+ z80_dbus_set_in();
+ z80_addrbus_set_tristate();
- case RUN:
- case RUN_AQRD:
- Z80_O_RST = 0;
- _delay_us(10);
- Z80_O_RST = 1;
- break;
+ ATOMIC_BLOCK(ATOMIC_FORCEON) {
+ Z80_O_BUSREQ = 1;
+ Z80_O_BUSREQ = 1; /* 2 AVR clock cycles */
+ Z80_O_BUSREQ = 0; /* 2 AVR clock cycles */
}
- debug("z80_reset_pulse: state: %02x --> %02x\n", old, zstate);
-}
-
-void z80_request_bus(void)
-{
-#if DEBUG
- zstate_t old = zstate;
-#endif
-
- switch (zstate) {
- case RESET:
- Z80_O_BUSREQ = 0;
- Z80_O_RST = 1;
- while(Z80_I_BUSACK == 1)
+ if (zstate & ZST_ACQUIRED) {
+ timer = BUS_TO;
+ while (Z80_I_BUSACK == 1 && timer)
;
- z80_setup_addrbus_active();
- zstate = RESET_AQRD;
- break;
-
- case RESET_AQRD:
- break;
-
- case RUN:
- Z80_O_BUSREQ = 0;
- while(Z80_I_BUSACK == 1);
- z80_setup_addrbus_active();
- zstate = RUN_AQRD;
- break;
-
- case RUN_AQRD:
- break;
+ if (Z80_I_BUSACK == 0)
+ z80_addrbus_set_active();
}
- debug("z80_request_bus: state: %02x --> %02x\n", old, zstate);
}
-void z80_release_bus(void)
-{
-#if DEBUG
- zstate_t old = zstate;
-#endif
- switch (zstate) {
- case RESET:
- break;
- case RESET_AQRD:
- z80_setup_dbus_in();
- z80_setup_addrbus_tristate();
- Z80_O_RST = 0;
- Z80_O_BUSREQ = 1;
- zstate = RESET;
- break;
- case RUN:
- break;
- case RUN_AQRD:
- z80_setup_dbus_in();
- z80_setup_addrbus_tristate();
- Z80_O_BUSREQ = 1;
- zstate = RUN;
- break;
- }
-
- debug("z80_release_bus: state: %02x --> %02x\n", old, zstate);
-}
/*
- * Do nothing, if we have the bus allready
- *
- * return previous state
- */
-zstate_t z80_request_bus_save(void)
-{
- zstate_t state;
-
- state = z80_runstate();
- if (!(state & ZST_ACQUIRED))
- z80_request_bus();
- return state;
-}
+ + | | | | |
+ + State | RESET | RESET_AQRD | RUNNING | RUNNING_AQRD |
+ + | | | | |
+ + | 0 | 1 | 2 | 3 |
+Event + | | | | |
+----------------+---------------+---------------+---------------+---------------+
+ | | | | |
+Reset | 0 | 0 | 0 | 0 |
+ | | | | |
+ | | | | |
+Request | 1 | | 3 | |
+ | | | | |
+ | | | | |
+Release | | 0 | | 2 |
+ | | | | |
+ | | | | |
+Run | 2 | 3 | | |
+ | | | | |
+ | | | | |
+Restart | | | 2 | 3 |
+ | | | | |
+ | | | | |
+M_Cycle | | | | 3 |
+ | | | | |
+ | | | | |
+*/
-/*
- * Do nothing, if we had the bus before
- */
-void z80_release_bus_save(zstate_t prev)
+zstate_t z80_bus_cmd(bus_cmd_t cmd)
{
- if (!(prev & ZST_ACQUIRED))
- z80_release_bus();
-}
+ switch (cmd) {
-void z80_run(void)
-{
-#if DEBUG
- zstate_t old = zstate;
-#endif
- switch (zstate) {
- case RESET:
- Z80_O_RST = 1;
- zstate = RUN;
- break;
-
- case RESET_AQRD:
- z80_setup_dbus_in();
- z80_setup_addrbus_tristate();
+ case Reset:
+ z80_dbus_set_in();
+ z80_addrbus_set_tristate();
Z80_O_RST = 0;
- _delay_us(10);
- Z80_O_RST = 1;
- z80_setup_addrbus_active();
- zstate = RUN_AQRD;
+ Z80_O_BUSREQ = 1;
+ zstate = RESET;
break;
- case RUN:
- break;
- case RUN_AQRD:
+ case Request:
+ switch (zstate) {
+ case RESET:
+ Z80_O_BUSREQ = 0;
+ Z80_O_RST = 1;
+ timer = BUS_TO;
+ while (Z80_I_BUSACK == 1 && timer)
+ ;
+ if (Z80_I_BUSACK == 0) {
+ z80_addrbus_set_active();
+ zstate = RESET_AQRD;
+ } else {
+ Z80_O_RST = 0;
+ Z80_O_BUSREQ = 1;
+ }
+ break;
+
+ case RUNNING:
+ Z80_O_BUSREQ = 0;
+ timer = BUS_TO;
+ while (Z80_I_BUSACK == 1 && timer)
+ ;
+ if (Z80_I_BUSACK == 0) {
+ z80_addrbus_set_active();
+ zstate = RUNNING_AQRD;
+ } else {
+ Z80_O_BUSREQ = 1;
+ }
+ break;
+
+ default:
+ break;
+ }
break;
- }
- debug("z80_run: state: %02x --> %02x\n", old, zstate);
-}
+ case Release:
+ switch (zstate) {
+ case RESET_AQRD:
+ z80_dbus_set_in();
+ z80_addrbus_set_tristate();
+ Z80_O_RST = 0;
+ Z80_O_BUSREQ = 1;
+ zstate = RESET;
+ break;
+ case RUNNING_AQRD:
+ z80_dbus_set_in();
+ z80_addrbus_set_tristate();
+ Z80_O_BUSREQ = 1;
+ zstate = RUNNING;
+ break;
+ default:
+ break;
+ }
+ break;
-void z80_busreq_hpulse(void)
-{
- z80_setup_dbus_in();
- z80_setup_addrbus_tristate();
+ case Run:
+ switch (zstate) {
+ case RESET:
+ Z80_O_RST = 1;
+ zstate = RUNNING;
+ break;
+
+ case RESET_AQRD:
+ z80_dbus_set_in();
+ z80_addrbus_set_tristate();
+ z80_reset_pulse();
+ z80_addrbus_set_active();
+ zstate = RUNNING_AQRD;
+ break;
+ default:
+ break;
+ }
+ break;
- ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
- Z80_O_BUSREQ = 1;
- Z80_O_BUSREQ = 1; /* 2 AVR clock cycles */
- Z80_O_BUSREQ = 0; /* 2 AVR clock cycles */
- }
+ case Restart:
+ switch (zstate) {
+ case RUNNING:
+ case RUNNING_AQRD:
+ z80_reset_pulse();
+ break;
+ default:
+ break;
+ }
+ break;
- if (zstate & ZST_ACQUIRED) {
- while(Z80_I_BUSACK == 1)
- ;
- z80_setup_addrbus_active();
+ case M_Cycle:
+ switch (zstate) {
+ case RUNNING_AQRD:
+ z80_busreq_hpulse(); /* TODO: */
+ break;
+ default:
+ break;
+ }
}
+ return zstate;
}
+
/*--------------------------------------------------------------------------*/
-static
+static
//inline __attribute__ ((always_inline))
void z80_setaddress(uint32_t addr)
{
{
z80_setaddress(addr);
Z80_O_MREQ = 0;
- z80_setup_dbus_out();
+ z80_dbus_set_out();
P_DB = data;
P_DB = data;
Z80_O_WR = 0;
z80_setaddress(addr);
Z80_O_MREQ = 0;
- z80_setup_dbus_in();
+ z80_dbus_set_in();
Z80_O_RD = 0;
Z80_O_RD = 0;
Z80_O_RD = 0;
void z80_memset(uint32_t addr, uint8_t data, uint32_t length)
{
- z80_setup_dbus_out();
+ z80_dbus_set_out();
Z80_O_MREQ = 0;
+ P_DB = data;
while(length--) {
z80_setaddress(addr++);
+ Z80_O_WR = 0;
+ Z80_O_WR = 0;
+ Z80_O_WR = 1;
+ }
+ Z80_O_MREQ = 1;
+}
+
+void z80_write_block_P(const FLASH uint8_t *src, uint32_t dest, uint32_t length)
+{
+ uint8_t data;
+
+ z80_dbus_set_out();
+ Z80_O_MREQ = 0;
+ while(length--) {
+ z80_setaddress(dest++);
+ data = *src++;
P_DB = data;
P_DB = data;
Z80_O_WR = 0;
Z80_O_MREQ = 1;
}
-void z80_write_block(const __flash uint8_t *src, uint32_t dest, uint32_t length)
+void z80_write_block(const uint8_t *src, uint32_t dest, uint32_t length)
{
uint8_t data;
-
- z80_setup_dbus_out();
+
+ z80_dbus_set_out();
Z80_O_MREQ = 0;
while(length--) {
z80_setaddress(dest++);
Z80_O_MREQ = 1;
}
+void z80_read_block (uint8_t *dest, uint32_t src, size_t length)
+{
+ uint8_t data;
+
+ Z80_O_MREQ = 0;
+ z80_dbus_set_in();
+ while(length--) {
+ z80_setaddress(src++);
+ Z80_O_RD = 0;
+ Z80_O_RD = 0;
+ Z80_O_RD = 0;
+ data = PIN_DB;
+ Z80_O_RD = 1;
+ *dest++ = data;
+ }
+ Z80_O_MREQ = 1;
+}
+
+
/*
0179' rx.bs_mask: ds 1 ; (buf_len - 1)
017A' rx.in_idx: ds 1 ;
017B' rx.out_idx: ds 1 ;
017C' rx.buf: ds rx.buf_len ;
018B' rx.buf_end equ $-1 ; last byte (start+len-1)
-
+
018C' tx.bs_mask: ds 1 ; (buf_len - 1)
018D' tx.in_idx: ds 1 ;
018E' tx.out_idx: ds 1 ;
idx_in,
mask;
} fifo_dsc[NUM_FIFOS];
-
-void z80_memfifo_init(const fifo_t f, uint32_t adr)
-{
-
-DBG_P(2, "z80_memfifo_init: %i, %lx\n", f, adr);
-
- fifo_dsc[f].base = adr;
- z80_request_bus();
+void z80_memfifo_init(const fifo_t f, uint32_t addr)
+{
+ fifo_dsc[f].base = addr;
- fifo_dsc[f].mask = z80_read(adr + FIFO_BUFSIZE_MASK);
- fifo_dsc[f].idx_in = z80_read(adr + FIFO_INDEX_IN);
- fifo_dsc[f].idx_out = z80_read(adr + FIFO_INDEX_OUT);
+DBG_P(2, "z80_memfifo_init: %i, %lx\n", f, addr);
- z80_release_bus();
+ if (addr != 0) {
+ z80_bus_cmd(Request);
+ fifo_dsc[f].mask = z80_read(addr + FIFO_BUFSIZE_MASK);
+ fifo_dsc[f].idx_in = z80_read(addr + FIFO_INDEX_IN);
+ fifo_dsc[f].idx_out = z80_read(addr + FIFO_INDEX_OUT);
+ z80_bus_cmd(Release);
+ }
}
uint32_t adr = fifo_dsc[f].base + FIFO_INDEX_IN;
uint8_t idx;
- z80_request_bus();
+ z80_bus_cmd(Request);
idx = z80_read(adr);
- z80_release_bus();
+ z80_bus_cmd(Release);
rc = idx == fifo_dsc[f].idx_out;
}
int z80_memfifo_is_full(const fifo_t f)
{
- int rc = 1;
-
+ int rc = 0;
+
if (fifo_dsc[f].base != 0) {
- z80_request_bus();
+ z80_bus_cmd(Request);
rc = ((fifo_dsc[f].idx_in + 1) & fifo_dsc[f].mask)
== z80_read(fifo_dsc[f].base+FIFO_INDEX_OUT);
- z80_release_bus();
+ z80_bus_cmd(Release);
}
return rc;
}
-uint8_t z80_memfifo_getc(const fifo_t f)
+
+uint8_t z80_memfifo_getc_wait(const fifo_t f)
{
uint8_t rc, idx;
-
+
while (z80_memfifo_is_empty(f))
;
- z80_request_bus();
+ z80_bus_cmd(Request);
idx = fifo_dsc[f].idx_out;
rc = z80_read(fifo_dsc[f].base+idx);
fifo_dsc[f].idx_out = ++idx & fifo_dsc[f].mask;
z80_write(fifo_dsc[f].base+FIFO_INDEX_OUT, fifo_dsc[f].idx_out);
- z80_release_bus();
-
+ z80_bus_cmd(Release);
+
+ return rc;
+}
+
+int z80_memfifo_getc(const fifo_t f)
+{
+ int rc = -1;
+
+ if (fifo_dsc[f].base != 0) {
+ uint8_t idx = fifo_dsc[f].idx_out;
+ z80_bus_cmd(Request);
+ if (idx != z80_read(fifo_dsc[f].base + FIFO_INDEX_IN)) {
+ rc = z80_read(fifo_dsc[f].base+idx);
+ fifo_dsc[f].idx_out = ++idx & fifo_dsc[f].mask;
+ z80_write(fifo_dsc[f].base+FIFO_INDEX_OUT, fifo_dsc[f].idx_out);
+ }
+ z80_bus_cmd(Release);
+ }
+
return rc;
}
void z80_memfifo_putc(fifo_t f, uint8_t val)
{
int idx;
-
+
while (z80_memfifo_is_full(f))
;
- z80_request_bus();
+ z80_bus_cmd(Request);
idx = fifo_dsc[f].idx_in;
z80_write(fifo_dsc[f].base+idx, val);
fifo_dsc[f].idx_in = ++idx & fifo_dsc[f].mask;
z80_write(fifo_dsc[f].base+FIFO_INDEX_IN, fifo_dsc[f].idx_in);
- z80_release_bus();
-}
-
-/*--------------------------------------------------------------------------*/
-/*
- TODO: Rewrite msg_fifo routines for AVR
-*/
-
-static struct {
- uint32_t base;
- //uint8_t idx_out, idx_in;
- uint16_t count;
- uint8_t buf[256];
- } msg_fifo;
-
-/*--------------------------------------------------------------------------*/
-
-#if 0
-
-static void tim1_setup(void)
-{
- RCC_APB2RSTR |= RCC_APB2RSTR_TIM1RST;
- RCC_APB2RSTR &= ~RCC_APB2RSTR_TIM1RST;
-
- TIM1_CR1 = 0;
-
- TIM1_SMCR = 0
- /* | TIM_SMCR_ETP */
- /* | TIM_SMCR_ETF_CK_INT_N_2 */
- | TIM_SMCR_TS_ETRF
- | TIM_SMCR_SMS_OFF
- ;
-
- TIM1_DIER = TIM_DIER_TDE;
-
-
- TIM1_CCMR1 = 0
- | TIM_CCMR1_OC1M_FORCE_LOW
- | TIM_CCMR1_CC1S_OUT;
-
- TIM1_SMCR |= TIM_SMCR_SMS_TM;
-}
-
-#endif
-
-/*--------------------------------------------------------------------------*/
-
-void z80_setup_msg_fifo(void)
-{
-// gpio_set_mode(P_BUSACK, GPIO_MODE_INPUT,
-// GPIO_CNF_INPUT_FLOAT, GPIO_BUSACK | GPIO_IOCS1);
-
-//...
-
-// msg_fifo.count = NELEMS(msg_fifo.buf);
- msg_fifo.count = 0;
- msg_fifo.base = 0;
-
-}
-
-
-void z80_init_msg_fifo(uint32_t addr)
-{
-
-DBG_P(1, "z80_init_msg_fifo: %lx\n", addr);
-
- z80_request_bus();
- z80_write(addr+FIFO_INDEX_OUT, z80_read(addr+FIFO_INDEX_IN));
- z80_release_bus();
- msg_fifo.base = addr;
-}
-
-
-int z80_msg_fifo_getc(void)
-{
- int c = -1;
-
-#if 0
- if (msg_fifo.count != (NELEMS(msg_fifo.buf) /*- DMA1_CNDTR4 */ )) {
- c = msg_fifo.buf[msg_fifo.count];
- if (++msg_fifo.count == NELEMS(msg_fifo.buf))
- msg_fifo.count = 0;
-
- if (msg_fifo.base != 0) {
- z80_request_bus();
- z80_write(msg_fifo.base+FIFO_INDEX_OUT, msg_fifo.count);
- z80_release_bus();
- }
- }
-#endif
-
- return c;
+ z80_bus_cmd(Release);
}
projects / z180-stamp.git / blobdiff