[z180-stamp.git] / avr / z80-if.c

/**
 *
 * Pin assignments
 *
 * | 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		|


 */

#include <avr/io.h>
#include <util/delay.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_MREQ		PORTD
#define MREQ		4
#define DDR_MREQ	DDRD
#define P_RD		PORTD
#define RD		3
#define P_WR		PORTD
#define WR		2
#define P_BUSREQ	PORTD
#define BUSREQ		7
#define DDR_BUSREQ	DDRD
#define P_BUSACK	PORTD
#define PIN_BUSACK	PIND
#define BUSACK		6
#define DDR_BUSACK	DDRD
//#define P_HALT		PORTA
//#define HALT		12
#define P_IOCS1		PORTE
#define IOCS1		5
#define DDR_IOCS1		DDRE
//#define P_NMI		PORTB
//#define NMI		7
#define P_RST		PORTD
#define DDR_RST		DDRD
#define RST		5


#define P_DB		PORTF
#define PIN_DB		PINF
#define DDR_DB		DDRF

#define P_ADL		PORTA
#define P_ADH		PORTC
#define P_ADB		PORTE
#define PIN_ADB		PINE
#define DDR_ADL		DDRA
#define DDR_ADH		DDRC
#define DDR_ADB		DDRE

#define ADB_WIDTH	3
#define ADB_SHIFT	2
//#define ADB_PORT	PORTE


#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_O_BUSREQ	SBIT(P_BUSREQ, 7)
//#define Z80_O_NMI	SBIT(P_NMI, )
#define Z80_O_RST	SBIT(P_RST, 5)
#define Z80_I_BUSACK	SBIT(PIN_BUSACK, 6)
//#define Z80_I_HALT	SBIT(P_HALT, )


void z80_busreq(level_t level)
{
	Z80_O_BUSREQ = level;
}

void z80_reset(level_t level)
{
	Z80_O_RST = level;
}


void z80_reset_pulse(void)
{
	Z80_O_RST = 0;
	_delay_us(10);
	Z80_O_RST = 1;
}

#if 0
int z80_stat_halt(void)
{
	return Z80_I_HALT;
}
#endif


#define MASK(n)	((1<<(n))-1)
#define SMASK(w,s) (MASK(w) << (s))


typedef union {
	uint32_t l;
	uint16_t w[2];
	uint8_t b[4];
} addr_t;
 

/*--------------------------------------------------------------------------*/


static void z80_setup_addrbus_tristate(void)
{
	/* /MREQ, /RD, /WR: Input, no pullup */
	DDR_MREQ &= ~(_BV(MREQ) | _BV(RD) | _BV(WR));
	Z80_O_MREQ = 0;
	Z80_O_RD = 0;
	Z80_O_WR = 0;

	P_ADL = 0;
	DDR_ADL = 0;
	P_ADH = 0;
	DDR_ADH = 0;
	PIN_ADB = P_ADB & ~(MASK(ADB_WIDTH) << ADB_SHIFT);
	DDR_ADB = DDR_ADB & ~(MASK(ADB_WIDTH) << ADB_SHIFT);
}

	
static void z80_setup_addrbus_active(void)
{
	/* /MREQ, /RD, /WR: Output and high */
	Z80_O_MREQ = 1;
	Z80_O_RD = 1;
	Z80_O_WR = 1;
	DDR_MREQ |= _BV(MREQ) | _BV(RD) | _BV(WR);

	DDR_ADL = 0xff;
	DDR_ADH = 0xff;
	DDR_ADB = DDR_ADB | (MASK(ADB_WIDTH) << ADB_SHIFT);
}


static void z80_setup_dbus_in(void)
{
	DDR_DB = 0;
	P_DB = 0;
}

static void z80_setup_dbus_out(void)
{
	DDR_DB = 0xff;
}

void z80_setup_bus(void)
{
	/* /ZRESET: Output and low */
	Z80_O_RST = 0;
	DDR_RST |= _BV(RST);

	/* /BUSREQ: Output and high */
	Z80_O_BUSREQ = 1;
	DDR_BUSREQ |= _BV(BUSREQ);

	/* /BUSACK: Input, no pullup */
	DDR_BUSACK &= ~_BV(BUSACK);
	P_BUSACK &= ~_BV(BUSACK);

	/* /IOCS1: Input, no pullup */
	DDR_IOCS1 &= ~_BV(IOCS1);
	P_IOCS1 &= ~_BV(IOCS1);

	z80_setup_addrbus_tristate();
	z80_setup_dbus_in();
}

/*--------------------------------------------------------------------------*/

void z80_request_bus(void)
{
	Z80_O_BUSREQ = 0;
	while(Z80_I_BUSACK == 1);
	z80_setup_addrbus_active();
}

void z80_release_bus(void)
{
	z80_setup_dbus_in();
	z80_setup_addrbus_tristate();
	Z80_O_BUSREQ = 1;
	//while(Z80_I_BUSACK == 0);
}

/*--------------------------------------------------------------------------*/

static 
//inline __attribute__ ((always_inline))
void z80_setaddress(uint32_t addr)
{
	addr_t x; x.l = addr;

	P_ADL = x.b[0];
	P_ADH = x.b[1];
	PIN_ADB = ((x.b[2] << ADB_SHIFT) ^ P_ADB) & MASK(ADB_WIDTH) << ADB_SHIFT ;
}

void z80_write(uint32_t addr, uint8_t data)
{
	z80_setaddress(addr);
	Z80_O_MREQ = 0;
	z80_setup_dbus_out();
	P_DB = data;
	P_DB = data;
	Z80_O_WR = 0;
	Z80_O_WR = 0;
	Z80_O_WR = 1;
	Z80_O_MREQ = 1;
}

uint8_t z80_read(uint32_t addr)
{
	uint8_t data;

	z80_setaddress(addr);
	Z80_O_MREQ = 0;
	z80_setup_dbus_in();
	Z80_O_RD = 0;
	Z80_O_RD = 0;
	Z80_O_RD = 0;
	data = PIN_DB;
	Z80_O_RD = 1;
	Z80_O_MREQ = 1;

	return data;
}


void z80_memset(uint32_t addr, uint8_t data, uint32_t length)
{
	z80_setup_dbus_out();
	Z80_O_MREQ = 0;
	while(length--) {
		z80_setaddress(addr++);
		P_DB = data;
		P_DB = data;
		Z80_O_WR = 0;
		Z80_O_WR = 0;
		Z80_O_WR = 1;
	}
	Z80_O_MREQ = 1;
}

void z80_write_block(const __flash uint8_t *src, uint32_t dest, uint32_t length)
{
	uint8_t data;
	
	z80_setup_dbus_out();
	Z80_O_MREQ = 0;
	while(length--) {
		z80_setaddress(dest++);
		data = *src++;
		P_DB = data;
		P_DB = data;
		Z80_O_WR = 0;
		Z80_O_WR = 0;
		Z80_O_WR = 1;
	}
	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		;
  018F'                         tx.buf:		ds	tx.buf_len 	;
  019E'                         tx.buf_end	equ	$-1		; last byte
*/


typedef struct __attribute__((packed)) {
	uint8_t mask;
	uint8_t in_idx;
	uint8_t out_idx;
	uint8_t buf[];
} zfifo_t;


#define FIFO_BUFSIZE_MASK	-3
#define FIFO_INDEX_IN		-2
#define FIFO_INDEX_OUT		-1


static struct {
	uint32_t base;
	uint8_t idx_out,
		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();

	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);

	z80_release_bus();
}


int z80_memfifo_is_empty(const fifo_t f)
{
	int rc = 1;

	if (fifo_dsc[f].base != 0) {

		uint32_t adr = fifo_dsc[f].base + FIFO_INDEX_IN;
		uint8_t idx;

		z80_request_bus();
		idx = z80_read(adr);
		z80_release_bus();
		rc = idx == fifo_dsc[f].idx_out;
	}

	return rc;
}

int z80_memfifo_is_full(const fifo_t f)
{
	int rc = 1;
	
	if (fifo_dsc[f].base != 0) {
		z80_request_bus();
		rc = ((fifo_dsc[f].idx_in + 1) & fifo_dsc[f].mask)
			== z80_read(fifo_dsc[f].base+FIFO_INDEX_OUT);
		z80_release_bus();
	}
	return rc;
}

uint8_t z80_memfifo_getc(const fifo_t f)
{
	uint8_t rc, idx;
	
	while (z80_memfifo_is_empty(f))
		;

	z80_request_bus();
	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();
	
	return rc;
}


void z80_memfifo_putc(fifo_t f, uint8_t val)
{
	int idx;
	
	while (z80_memfifo_is_full(f))
		;

	z80_request_bus();
	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();
}

/*--------------------------------------------------------------------------*/

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;
}
Commit	Line	Data
0c5890bb L	1	/**
	2	*
	3	* Pin assignments
	4	*
	5	* \| Z180-Sig \| AVR-Port \| Dir \| Special Function \|
	6	* +------------+---------------+-------+-----------------------+
	7	* \| A0 \| PA 0 \| O \| \|
	8	* \| A1 \| PA 1 \| O \| \|
	9	* \| A2 \| PA 2 \| O \| \|
	10	* \| A3 \| PA 3 \| O \| \|
	11	* \| A4 \| PA 4 \| O \| \|
	12	* \| A5 \| PA 5 \| O \| \|
	13	* \| A6 \| PA 6 \| O \| \|
	14	* \| A7 \| PA 7 \| O \| \|
	15	* \| A8 \| PC 0 \| O \| \|
	16	* \| A9 \| PC 1 \| O \| \|
	17	* \| A10 \| PC 2 \| O \| \|
	18	* \| A11 \| PC 3 \| O \| \|
	19	* \| A12 \| PC 4 \| O \| \|
	20	* \| A13 \| PC 5 \| O \| \|
	21	* \| A14 \| PC 6 \| O \| \|
	22	* \| A15 \| PC 7 \| O \| \|
	23	* \| A16 \| PE 2 \| O \| \|
	24	* \| A17 \| PE 3 \| O \| \|
	25	* \| A18 \| PE 4 \| O \| \|
	26	* \| D0 \| PF 0 \| I/O \| \|
	27	* \| D1 \| PF 1 \| I/O \| \|
	28	* \| D2 \| PF 2 \| I/O \| \|
	29	* \| D3 \| PF 3 \| I/O \| \|
	30	* \| D4 \| PF 4 \| I/O \| \|
	31	* \| D5 \| PF 5 \| I/O \| \|
	32	* \| D6 \| PF 6 \| I/O \| \|
	33	* \| D7 \| PF 7 \| I/O \| \|
	34	* \| RD \| PD 3 \| O \| \|
	35	* \| WR \| PD 2 \| O \| \|
	36	* \| MREQ \| PD 4 \| O \| \|
	37	* \| RST \| PD 5 \| O \| \|
	38	* \| BUSREQ \| PD 7 \| O \| \|
	39	* \| BUSACK \| PD 6 \| I \| \|
	40	* \| IOCS1 \| PE 5 \| I \| \|
	41	* \|* HALT \| P \| \| \|
	42	* \|* NMI \| P \| \| \|
	43	* \| \| P \| \| \|
	44	* \| \| P \| \| af1 USART1_TX \|
	45	* \| \| P \| \| af1 USART1_RX \|
	46	* \| \| P \|JTDI \| remap SPI1_NSS' \|
	47	* \| \| P \|JTDO \| remap SPI1_SCK' \|
	48	* \| \| P \|JTRST \| remap SPI1_MISO' \|
	49	* \| \| P \| \| remap SPI1_MOSI' \|
	50	* \| \| P \| \| af1 OSC32 \|
	51	* \| \| P \| \| af1 OSC32 \|
	52
	53
	54	*/
	55
	56	#include <avr/io.h>
	57	#include <util/delay.h>
	58	#include <stdio.h>
	59	#include "debug.h"
	60	#include "z80-if.h"
	61
	62
	63	/* Number of array elements */
	64	#define NELEMS(x) (sizeof x/sizeof *x)
65
66
67	#define CONCAT(x,y) x ## y
68	#define EVALUATOR(x,y) CONCAT(x,y)
69
70	#define GPIO_(X) CONCAT(GPIO, X)
71
72	struct bits {
73	uint8_t b0:1;
74	uint8_t b1:1;
75	uint8_t b2:1;
76	uint8_t b3:1;
77	uint8_t b4:1;
78	uint8_t b5:1;
79	uint8_t b6:1;
80	uint8_t b7:1;
81	} __attribute__((__packed__));
82
83	#define SBIT(port,pin) (((volatile struct bits)&port).b##pin)
84
85
86
87	#define P_MREQ PORTD
88	#define MREQ 4
89	#define DDR_MREQ DDRD
90	#define P_RD PORTD
91	#define RD 3
92	#define P_WR PORTD
93	#define WR 2
94	#define P_BUSREQ PORTD
95	#define BUSREQ 7
96	#define DDR_BUSREQ DDRD
97	#define P_BUSACK PORTD
9b6b4b31	98	#define PIN_BUSACK PIND
0c5890bb L	99	#define BUSACK 6
	100	#define DDR_BUSACK DDRD
	101	//#define P_HALT PORTA
	102	//#define HALT 12
	103	#define P_IOCS1 PORTE
	104	#define IOCS1 5
	105	#define DDR_IOCS1 DDRE
	106	//#define P_NMI PORTB
	107	//#define NMI 7
	108	#define P_RST PORTD
	109	#define DDR_RST DDRD
	110	#define RST 5
	111
	112
	113	#define P_DB PORTF
	114	#define PIN_DB PINF
	115	#define DDR_DB DDRF
	116
	117	#define P_ADL PORTA
	118	#define P_ADH PORTC
	119	#define P_ADB PORTE
	120	#define PIN_ADB PINE
9b6b4b31 L	121	#define DDR_ADL DDRA
9b6b4b31 L	122	#define DDR_ADH DDRC
0c5890bb L	123	#define DDR_ADB DDRE
	124
	125	#define ADB_WIDTH 3
	126	#define ADB_SHIFT 2
	127	//#define ADB_PORT PORTE
	128
	129
0c5890bb L	130	#define Z80_O_MREQ SBIT(P_MREQ, 4)
	131	#define Z80_O_RD SBIT(P_RD, 3)
	132	#define Z80_O_WR SBIT(P_WR, 2)
	133	#define Z80_O_BUSREQ SBIT(P_BUSREQ, 7)
	134	//#define Z80_O_NMI SBIT(P_NMI, )
	135	#define Z80_O_RST SBIT(P_RST, 5)
9b6b4b31	136	#define Z80_I_BUSACK SBIT(PIN_BUSACK, 6)
0c5890bb L	137	//#define Z80_I_HALT SBIT(P_HALT, )
0c5890bb L	138
9b6b4b31	139
0c5890bb L	140	void z80_busreq(level_t level)
	141	{
	142	Z80_O_BUSREQ = level;
	143	}
	144
	145	void z80_reset(level_t level)
	146	{
	147	Z80_O_RST = level;
	148	}
	149
	150
	151	void z80_reset_pulse(void)
	152	{
	153	Z80_O_RST = 0;
	154	_delay_us(10);
	155	Z80_O_RST = 1;
	156	}
	157
	158	#if 0
	159	int z80_stat_halt(void)
	160	{
	161	return Z80_I_HALT;
	162	}
	163	#endif
	164
	165
	166	#define MASK(n) ((1<<(n))-1)
	167	#define SMASK(w,s) (MASK(w) << (s))
	168
	169
	170
eded7ec4 L	171	typedef union {
	172	uint32_t l;
	173	uint16_t w[2];
	174	uint8_t b[4];
	175	} addr_t;
	176
	177
0c5890bb L	178	/--------------------------------------------------------------------------/
	179
	180
9b6b4b31	181	static void z80_setup_addrbus_tristate(void)
0c5890bb	182	{
9b6b4b31 L	183	/* /MREQ, /RD, /WR: Input, no pullup */
	184	DDR_MREQ &= ~(_BV(MREQ) \| _BV(RD) \| _BV(WR));
	185	Z80_O_MREQ = 0;
	186	Z80_O_RD = 0;
	187	Z80_O_WR = 0;
	188
0c5890bb L	189	P_ADL = 0;
	190	DDR_ADL = 0;
	191	P_ADH = 0;
	192	DDR_ADH = 0;
9b6b4b31	193	PIN_ADB = P_ADB & ~(MASK(ADB_WIDTH) << ADB_SHIFT);
0c5890bb L	194	DDR_ADB = DDR_ADB & ~(MASK(ADB_WIDTH) << ADB_SHIFT);
	195	}
	196
	197
9b6b4b31	198	static void z80_setup_addrbus_active(void)
0c5890bb	199	{
9b6b4b31 L	200	/* /MREQ, /RD, /WR: Output and high */
	201	Z80_O_MREQ = 1;
	202	Z80_O_RD = 1;
	203	Z80_O_WR = 1;
	204	DDR_MREQ \|= _BV(MREQ) \| _BV(RD) \| _BV(WR);
	205
0c5890bb L	206	DDR_ADL = 0xff;
	207	DDR_ADH = 0xff;
	208	DDR_ADB = DDR_ADB \| (MASK(ADB_WIDTH) << ADB_SHIFT);
	209	}
	210
	211
	212
	213	static void z80_setup_dbus_in(void)
	214	{
	215	DDR_DB = 0;
	216	P_DB = 0;
	217	}
	218
	219	static void z80_setup_dbus_out(void)
	220	{
	221	DDR_DB = 0xff;
	222	}
	223
0c5890bb L	224	void z80_setup_bus(void)
0c5890bb L	225	{
9b6b4b31	226	/* /ZRESET: Output and low */
0c5890bb L	227	Z80_O_RST = 0;
	228	DDR_RST \|= _BV(RST);
	229
9b6b4b31	230	/* /BUSREQ: Output and high */
0c5890bb L	231	Z80_O_BUSREQ = 1;
	232	DDR_BUSREQ \|= _BV(BUSREQ);
	233
9b6b4b31	234	/* /BUSACK: Input, no pullup */
0c5890bb L	235	DDR_BUSACK &= ~_BV(BUSACK);
	236	P_BUSACK &= ~_BV(BUSACK);
	237
9b6b4b31	238	/* /IOCS1: Input, no pullup */
0c5890bb L	239	DDR_IOCS1 &= ~_BV(IOCS1);
	240	P_IOCS1 &= ~_BV(IOCS1);
	241
9b6b4b31	242	z80_setup_addrbus_tristate();
0c5890bb L	243	z80_setup_dbus_in();
	244	}
	245
9b6b4b31 L	246	/--------------------------------------------------------------------------/
9b6b4b31 L	247
0c5890bb L	248	void z80_request_bus(void)
	249	{
	250	Z80_O_BUSREQ = 0;
	251	while(Z80_I_BUSACK == 1);
9b6b4b31	252	z80_setup_addrbus_active();
0c5890bb L	253	}
	254
	255	void z80_release_bus(void)
	256	{
	257	z80_setup_dbus_in();
9b6b4b31	258	z80_setup_addrbus_tristate();
0c5890bb	259	Z80_O_BUSREQ = 1;
9b6b4b31 L	260	//while(Z80_I_BUSACK == 0);
	261	}
	262
	263	/--------------------------------------------------------------------------/
	264
	265	static
	266	//inline __attribute__ ((always_inline))
	267	void z80_setaddress(uint32_t addr)
	268	{
	269	addr_t x; x.l = addr;
	270
	271	P_ADL = x.b[0];
	272	P_ADH = x.b[1];
	273	PIN_ADB = ((x.b[2] << ADB_SHIFT) ^ P_ADB) & MASK(ADB_WIDTH) << ADB_SHIFT ;
0c5890bb L	274	}
	275
	276	void z80_write(uint32_t addr, uint8_t data)
	277	{
	278	z80_setaddress(addr);
	279	Z80_O_MREQ = 0;
0c5890bb	280	z80_setup_dbus_out();
9b6b4b31 L	281	P_DB = data;
	282	P_DB = data;
	283	Z80_O_WR = 0;
0c5890bb L	284	Z80_O_WR = 0;
	285	Z80_O_WR = 1;
	286	Z80_O_MREQ = 1;
	287	}
	288
	289	uint8_t z80_read(uint32_t addr)
	290	{
	291	uint8_t data;
	292
	293	z80_setaddress(addr);
	294	Z80_O_MREQ = 0;
	295	z80_setup_dbus_in();
	296	Z80_O_RD = 0;
	297	Z80_O_RD = 0;
9b6b4b31	298	Z80_O_RD = 0;
0c5890bb L	299	data = PIN_DB;
	300	Z80_O_RD = 1;
	301	Z80_O_MREQ = 1;
	302
	303	return data;
	304	}
	305
	306
	307	void z80_memset(uint32_t addr, uint8_t data, uint32_t length)
	308	{
	309	z80_setup_dbus_out();
	310	Z80_O_MREQ = 0;
	311	while(length--) {
	312	z80_setaddress(addr++);
	313	P_DB = data;
9b6b4b31 L	314	P_DB = data;
9b6b4b31 L	315	Z80_O_WR = 0;
0c5890bb L	316	Z80_O_WR = 0;
	317	Z80_O_WR = 1;
	318	}
	319	Z80_O_MREQ = 1;
	320	}
	321
9b6b4b31	322	void z80_write_block(const __flash uint8_t *src, uint32_t dest, uint32_t length)
0c5890bb L	323	{
	324	uint8_t data;
	325
	326	z80_setup_dbus_out();
	327	Z80_O_MREQ = 0;
	328	while(length--) {
	329	z80_setaddress(dest++);
	330	data = *src++;
	331	P_DB = data;
9b6b4b31 L	332	P_DB = data;
9b6b4b31 L	333	Z80_O_WR = 0;
0c5890bb L	334	Z80_O_WR = 0;
	335	Z80_O_WR = 1;
	336	}
	337	Z80_O_MREQ = 1;
	338	}
	339
	340	/*
	341	0179' rx.bs_mask: ds 1 ; (buf_len - 1)
	342	017A' rx.in_idx: ds 1 ;
	343	017B' rx.out_idx: ds 1 ;
	344	017C' rx.buf: ds rx.buf_len ;
	345	018B' rx.buf_end equ $-1 ; last byte (start+len-1)
	346
	347	018C' tx.bs_mask: ds 1 ; (buf_len - 1)
	348	018D' tx.in_idx: ds 1 ;
	349	018E' tx.out_idx: ds 1 ;
	350	018F' tx.buf: ds tx.buf_len ;
	351	019E' tx.buf_end equ $-1 ; last byte
	352	*/
	353
	354
	355	typedef struct __attribute__((packed)) {
	356	uint8_t mask;
	357	uint8_t in_idx;
	358	uint8_t out_idx;
	359	uint8_t buf[];
	360	} zfifo_t;
	361
	362
	363
	364	#define FIFO_BUFSIZE_MASK -3
	365	#define FIFO_INDEX_IN -2
	366	#define FIFO_INDEX_OUT -1
	367
	368
	369	static struct {
	370	uint32_t base;
	371	uint8_t idx_out,
	372	idx_in,
	373	mask;
	374	} fifo_dsc[NUM_FIFOS];
	375
	376
	377	void z80_memfifo_init(const fifo_t f, uint32_t adr)
	378	{
	379
	380	DBG_P(2, "z80_memfifo_init: %i, %lx\n", f, adr);
	381
	382	fifo_dsc[f].base = adr;
	383
	384	z80_request_bus();
	385
	386	fifo_dsc[f].mask = z80_read(adr + FIFO_BUFSIZE_MASK);
	387	fifo_dsc[f].idx_in = z80_read(adr + FIFO_INDEX_IN);
	388	fifo_dsc[f].idx_out = z80_read(adr + FIFO_INDEX_OUT);
	389
	390	z80_release_bus();
	391	}
	392
	393
	394	int z80_memfifo_is_empty(const fifo_t f)
	395	{
	396	int rc = 1;
	397
398	if (fifo_dsc[f].base != 0) {
399
400	uint32_t adr = fifo_dsc[f].base + FIFO_INDEX_IN;
401	uint8_t idx;
402
403	z80_request_bus();
404	idx = z80_read(adr);
405	z80_release_bus();
406	rc = idx == fifo_dsc[f].idx_out;
407	}
408
409	return rc;
410	}
411
412	int z80_memfifo_is_full(const fifo_t f)
413	{
414	int rc = 1;
415
416	if (fifo_dsc[f].base != 0) {
417	z80_request_bus();
418	rc = ((fifo_dsc[f].idx_in + 1) & fifo_dsc[f].mask)
419	== z80_read(fifo_dsc[f].base+FIFO_INDEX_OUT);
420	z80_release_bus();
421	}
422	return rc;
423	}
424
425	uint8_t z80_memfifo_getc(const fifo_t f)
426	{
427	uint8_t rc, idx;
428
429	while (z80_memfifo_is_empty(f))
430	;
431
432	z80_request_bus();
433	idx = fifo_dsc[f].idx_out;
434	rc = z80_read(fifo_dsc[f].base+idx);
435	fifo_dsc[f].idx_out = ++idx & fifo_dsc[f].mask;
436	z80_write(fifo_dsc[f].base+FIFO_INDEX_OUT, fifo_dsc[f].idx_out);
437	z80_release_bus();
438
439	return rc;
440	}
441
442
443	void z80_memfifo_putc(fifo_t f, uint8_t val)
444	{
445	int idx;
446
447	while (z80_memfifo_is_full(f))
448	;
449
450	z80_request_bus();
451	idx = fifo_dsc[f].idx_in;
452	z80_write(fifo_dsc[f].base+idx, val);
453	fifo_dsc[f].idx_in = ++idx & fifo_dsc[f].mask;
454	z80_write(fifo_dsc[f].base+FIFO_INDEX_IN, fifo_dsc[f].idx_in);
455	z80_release_bus();
456	}
457
458	/--------------------------------------------------------------------------/
459
460	static struct {
461	uint32_t base;
462	//uint8_t idx_out, idx_in;
463	uint16_t count;
464	uint8_t buf[256];
465	} msg_fifo;
466
467	/--------------------------------------------------------------------------/
468
469	#if 0
470
471	static void tim1_setup(void)
472	{
473	RCC_APB2RSTR \|= RCC_APB2RSTR_TIM1RST;
474	RCC_APB2RSTR &= ~RCC_APB2RSTR_TIM1RST;
475
476	TIM1_CR1 = 0;
477
478	TIM1_SMCR = 0
479	/* \| TIM_SMCR_ETP */
480	/* \| TIM_SMCR_ETF_CK_INT_N_2 */
481	\| TIM_SMCR_TS_ETRF
482	\| TIM_SMCR_SMS_OFF
483	;
484
485	TIM1_DIER = TIM_DIER_TDE;
486
487
488	TIM1_CCMR1 = 0
489	\| TIM_CCMR1_OC1M_FORCE_LOW
490	\| TIM_CCMR1_CC1S_OUT;
491
492	TIM1_SMCR \|= TIM_SMCR_SMS_TM;
493	}
494
495	#endif
496
497	/--------------------------------------------------------------------------/
498
499	void z80_setup_msg_fifo(void)
500	{
501	// gpio_set_mode(P_BUSACK, GPIO_MODE_INPUT,
502	// GPIO_CNF_INPUT_FLOAT, GPIO_BUSACK \| GPIO_IOCS1);
503
504	//...
505
506	// msg_fifo.count = NELEMS(msg_fifo.buf);
507	msg_fifo.count = 0;
508	msg_fifo.base = 0;
509
510	}
511
512
513	void z80_init_msg_fifo(uint32_t addr)
514	{
515
516	DBG_P(1, "z80_init_msg_fifo: %lx\n", addr);
517
518	z80_request_bus();
519	z80_write(addr+FIFO_INDEX_OUT, z80_read(addr+FIFO_INDEX_IN));
520	z80_release_bus();
521	msg_fifo.base = addr;
522	}
523
524
525	int z80_msg_fifo_getc(void)
526	{
527	int c = -1;
528
9b6b4b31	529	#if 0
0c5890bb L	530	if (msg_fifo.count != (NELEMS(msg_fifo.buf) /- DMA1_CNDTR4 / )) {
	531	c = msg_fifo.buf[msg_fifo.count];
	532	if (++msg_fifo.count == NELEMS(msg_fifo.buf))
	533	msg_fifo.count = 0;
	534
	535	if (msg_fifo.base != 0) {
	536	z80_request_bus();
	537	z80_write(msg_fifo.base+FIFO_INDEX_OUT, msg_fifo.count);
	538	z80_release_bus();
	539	}
	540	}
9b6b4b31	541	#endif
0c5890bb L	542
	543	return c;
	544	}