[z180-stamp.git] / avr / cmd_cpu.c

/*
 * (C) Copyright 2018 Leo C. <erbl259-lmu@yahoo.de>
 *
 * SPDX-License-Identifier:	GPL-2.0
 */

#include "cmd_cpu.h"
//#include <ctype.h>
#include <util/atomic.h>

#include "z80-if.h"
#include "con-utils.h"
//#include "env.h"
#include "eval_arg.h"
#include "timer.h"
#include "getopt-min.h"
//#include "debug.h"

/* hack to get Z180 loadfile into flash memory */
#define const const FLASH
#include "../z180/cpuinfo.h"
#undef const


/*
 * delay for <count> ms...
 */
static void	test_delay(uint32_t count)
{
	uint32_t ts = get_timer(0);

	while (get_timer(ts) <= count);
}

static int32_t z80_measure_phi(uint8_t cycles, bool input_clk, uint16_t wait_ms)
{
	uint16_t ref_stop;
	uint16_t ref_ovfl;
	uint32_t x_freq;


	PRR1 &= ~_BV(PRTIM3);
	TCCR3A = 0;
	TCCR3B = 0b000<<CS30;	/* stop counter */
	TCNT3 = 0;
	TIFR3 = _BV(TOV3);
	ref_ovfl = 0;
	ATOMIC_BLOCK(ATOMIC_FORCEON) {
		/* Reset pending int */
		EIFR = _BV(INTF6);
		/* Wait for falling edge */
		while ((EIFR & _BV(INTF6)) == 0)
			;
		//ref_start = TCNT4;
		OCR4B = TCNT4;
		TCCR3B = 0b110<<CS30;	/* Count falling edges on T3 (==INT6) */
		TIFR4 = _BV(OCF4B);		/* clear compare match flag */
	}
	while (ref_ovfl < 60) {
		ATOMIC_BLOCK(ATOMIC_FORCEON) {
			if ((TIFR4 & _BV(OCF4B)) != 0) {
				TIFR4 = _BV(OCF4B);
				ref_ovfl++;
			}
		}
	}

	ATOMIC_BLOCK(ATOMIC_FORCEON) {
		EIFR = _BV(INTF6);
		for (;;) {
			if (EIFR & _BV(INTF6))
				break;
			if (TIFR4 & _BV(OCF4B)) {
				if (EIFR & _BV(INTF6))
					break;
				TIFR4 = _BV(OCF4B);
				if (EIFR & _BV(INTF6))
					break;
				ref_ovfl++;
				if (EIFR & _BV(INTF6))
					break;
				if (ref_ovfl == 0)
					break;
			}
		}
		ref_stop = TCNT4;
		TCCR3B = 0b000<<CS30;	/* stop counter */
		if ((TIFR4 & _BV(OCF4B)) != 0) {
			TIFR4 = _BV(OCF4B);
			if (ref_ovfl)
				ref_ovfl++;
		}
	}

	if (ref_ovfl == 0)
		x_freq = 0xFFFFFFFE;
	else
	{
		uint32_t ref_cnt = (ref_stop - OCR4B) + ((uint32_t)ref_ovfl << 16);

		x_freq = TCNT3;						/* x_cnt (17 bit) */
		if ((TIFR3 & _BV(TOV3)) != 0)
			x_freq += 1UL << 16;
		uint32_t x_cnt = x_freq;
		if (input_clk)						/* compute input clock */
			x_freq *= 2;
		x_freq *= cycles;

		x_freq = ((uint64_t) x_freq * F_CPU + (ref_cnt / 2))/ ref_cnt;

		printf_P(PSTR("ref_start: %6u, ref_stop: %6u, ref_ovfl: %4u, ref_cnt: %9lu\n"
					  "    TCNT3: %6u,    x_cnt: %6lu, cycles: %3u, xfreq: %9lu\n"),
					OCR4B, ref_stop, ref_ovfl, ref_cnt,
					TCNT3, x_cnt, cycles, x_freq);

		/* round to 5 decimal digits */
		uint8_t sc = 0;
		while (x_freq >= 100000UL) {
			x_freq = (x_freq + 5)/10;
			++sc;
		}
		while (sc--)
			x_freq *= 10;
	}

	/* Stop Timer */
	TCCR3B = 0;
	PRR1 |= _BV(PRTIM3);

	return (int32_t) x_freq;
}


static const FLASH char * const FLASH cpu_strings[] = {
	FSTR("Unknown CPU"),
	FSTR("8080"),
	FSTR("8085"),
	FSTR("Z80"),
	FSTR("x180"),
	FSTR("HD64180"),
	FSTR("Z80180"),
	FSTR("Z80S180"),
};

command_ret_t do_cpuchk(cmd_tbl_t *cmdtp UNUSED, uint_fast8_t flag UNUSED, int argc UNUSED, char * const argv[] UNUSED)
{
	uint8_t done = 0;
	uint8_t cputype;
	ERRNUM err = ESUCCESS;
	uint8_t ram_save[cpuinfo_length];

	if (z80_bus_state() & ZST_RUNNING) {
		err = ERUNNING;
	} else {
		z80_bus_request_or_exit();
		z80_read_block(ram_save, 0, cpuinfo_length);
		z80_load_mem(0, cpuinfo,
					&cpuinfo_sections,
					cpuinfo_address,
					cpuinfo_length_of_sections);
		z80_bus_cmd(Release);

		if (argv[1] && (argv[1][0] == 'n'))
			goto donot;

		z80_bus_cmd(Run);

		clear_ctrlc();		/* forget any previous Control C */
		while (done != 0xFF) {
			_delay_ms(8);
			/* check for ctrl-c to abort... */
			if (had_ctrlc() || ctrlc()) {
				err = EINTR;
				break;
			}
			z80_bus_cmd(Request);
			done = z80_read(3);
			if (done == 0xFF)
				cputype = z80_read(4);
			z80_bus_cmd(Release);
		}
		z80_bus_cmd(Reset);
		z80_bus_cmd(Request);
//		z80_write_block(ram_save, 0, cpuinfo_length);
		z80_bus_cmd(Release);
	}

donot:

	if (err)
		cmd_error(CMD_RET_FAILURE, err, NULL);

	if (done == 0xFF) {
		if (cputype >= ARRAY_SIZE(cpu_strings))
			cputype = 0;
		printf_P(PSTR("Detected CPU: %S\n"), cpu_strings[cputype]);
	}

	return CMD_RET_SUCCESS;
}

command_ret_t do_cpu_test(cmd_tbl_t *cmdtp UNUSED, uint_fast8_t flag UNUSED, int argc, char * const argv[])
{

	uint32_t pulsewidth = 10; /* ms */

	/* reset getopt() */
	optind = 0;

	int opt;
	while ((opt = getopt(argc, argv, PSTR("t:"))) != -1) {
		switch (opt) {
		case 't':
			pulsewidth = eval_arg(optarg, NULL);
			break;
		default: /* '?' */
			return CMD_RET_USAGE;
		}
	}

	if ((z80_bus_state() & ZST_ACQUIRED) != RESET)
		cmd_error(CMD_RET_FAILURE, ERUNNING, NULL);

	clear_ctrlc();		/* forget any previous Control C */
	do {
		z80_bus_cmd(Request);
		test_delay(pulsewidth);
		z80_bus_cmd(Release);
		test_delay(pulsewidth);
	} while (!(had_ctrlc() || ctrlc()));

	return CMD_RET_SUCCESS;
}

command_ret_t do_bus_test(cmd_tbl_t *cmdtp UNUSED, uint_fast8_t flag UNUSED, int argc UNUSED, char * const argv[] UNUSED)
{
	char ch;

#if 0
	/* reset getopt() */
	optind = 0;
	int opt;
	while ((opt = getopt(argc, argv, PSTR("t:"))) != -1) {
		switch (opt) {
		case 't':
			pulsewidth = eval_arg(optarg, NULL);
			break;
		default: /* '?' */
			return CMD_RET_USAGE;
		}
	}
#endif

	my_puts_P(PSTR(
		"  1:  RESET         4:  RUN           r:  Toggle /RESET\n"
		"  2:  REQUEST       5:  RESTART       b:  Toggle /BUSREQ\n"
		"  3:  RELEASE       6:  M_CYCLE\n"
		"\n"
		//"Bus state: "
	));

	do {
		ch = my_getchar(1);
		if (ch >= 0) {
			switch (ch) {
				case '1':		/* bus_cmd RESET   */
				case '2':		/* bus_cmd REQUEST */
				case '3':		/* bus_cmd RELEASE */
				case '4':		/* bus_cmd RUN     */
				case '5':		/* bus_cmd RESTART */
				case '6':		/* bus_cmd M_CYCLE */
						z80_bus_cmd(ch - '1' + Reset);
						break;
				case 'r':		/* Toggle RESET    */
						z80_toggle_reset();
						break;
				case 'b':		/* Toggle BUSREQ   */
						z80_toggle_busreq();
						break;
			}
			test_delay(10);
			uint32_t cycles = z80_get_busreq_cycles();
			printf_P(PSTR("\rState: %.2x, cycles: %lu, time: %luus      "),
					z80_bus_state(), cycles, (uint32_t) (cycles * 1000000LL / F_CPU));
		}
	} while (ch != 0x03);

	putchar('\n');
	return CMD_RET_SUCCESS;
}

command_ret_t do_busack_test(cmd_tbl_t *cmdtp UNUSED, uint_fast8_t flag UNUSED, int argc UNUSED, char * const argv[] UNUSED)
{

	if ((z80_bus_state() & ZST_ACQUIRED) != RESET)
		cmd_error(CMD_RET_FAILURE, ERUNNING, NULL);

	z80_bus_cmd(Request);
	uint32_t result = z80_get_busreq_cycles();
	test_delay(20);
	z80_bus_cmd(Release);

#if 0
	long div;

	pinconf = gpio_config_get(pin);
	if (pinconf == OUTPUT_TIMER) {
		div = gpio_clockdiv_get(pin);
	}
#endif


	printf_P(PSTR("cycles: %lu, time: %luus\n"), result, (uint32_t) (result * 1000000LL / F_CPU));

	return CMD_RET_SUCCESS;
}

command_ret_t do_cpu_freq(cmd_tbl_t *cmdtp UNUSED, uint_fast8_t flag UNUSED, int argc, char * const argv[])
{

#define O_SILENT		(1<<0)
#define O_WENV			(1<<1)
#define O_LOAD_LOOP     (1<<2)
#define O_UNLOAD_LOOP   (1<<3)

	uint_fast8_t options = O_LOAD_LOOP | O_UNLOAD_LOOP;
	uint8_t lcycles = 18;
	uint16_t timeout = 1000;

	uint8_t eicrb_save;
	uint8_t eimsk_save;
	uint8_t mem_save[cpuinfo_length];

	/* reset getopt() */
	optind = 0;

	int opt;
	while ((opt = getopt(argc, argv, PSTR("swnuc:t:"))) != -1) {
		switch (opt) {
		case 's':
			options |= O_SILENT;
			break;
		case 'w':
			options |= O_WENV;
			break;
		case 'n':
			options &= ~O_LOAD_LOOP;
			break;
		case 'u':
			options &= ~O_UNLOAD_LOOP;
			break;
		case 'c':
			lcycles = eval_arg(optarg, NULL);
			break;
		case 't':
			timeout = eval_arg(optarg, NULL);
			break;
		default: /* '?' */
			return CMD_RET_USAGE;
		}
	}
	if (argc - optind != 0)
		return CMD_RET_USAGE;

	if (z80_bus_state() & ZST_RUNNING) {
		if (!(options & O_SILENT))
			printf_P(PSTR("Frequency measuring failed. CPU allready running!\n"));
		return CMD_RET_FAILURE;
	}

	ATOMIC_BLOCK(ATOMIC_FORCEON) {
		/* Save state and disable INT6 */
		eimsk_save = EIMSK;
		EIMSK &= ~_BV(INT6);
		/* Save state and set INT6 for falling edge */
		eicrb_save = EICRB;
		EICRB = (eicrb_save & ~(0b11 << ISC60)) | (0b10 << ISC60);
	}

	z80_bus_cmd(Request);
	if (options & O_LOAD_LOOP) {
		z80_read_block(mem_save, 0, cpuinfo_length);
		z80_load_mem(0, cpuinfo,
					&cpuinfo_sections,
					cpuinfo_address,
					cpuinfo_length_of_sections);
	}
	Stat &= ~S_IO_0X40;				/* Reset pending int */
	z80_bus_cmd(Release);
	z80_bus_cmd(Run);

	clear_ctrlc();					/* forget any previous Control C */
	ERRNUM err = 0;

	/* Wait for falling edge */
	do {
		/* check for ctrl-c to abort... */
		if (had_ctrlc() || ctrlc()) {
			err = EINTR;
			break;
		}
	} while ((Stat & S_IO_0X40) == 0);

	int32_t cpu_freq;
	if (!err)
		cpu_freq = z80_measure_phi(lcycles, false, timeout);

	z80_bus_cmd(Reset);
	if (options & O_UNLOAD_LOOP) {
		z80_bus_cmd(Request);
		z80_write_block(mem_save, 0, cpuinfo_length);
		z80_bus_cmd(Release);
	}
	ATOMIC_BLOCK(ATOMIC_FORCEON) {
		/* Restore INT6 */
		eicrb_save = EICRB;
		EICRB = (EICRB & ~(0b11 << ISC60)) | (eicrb_save & (0b11 << ISC60));
		if ((eimsk_save & _BV(INT6)) != 0)
			EIMSK |= _BV(INT6);
		/* Reset pending int */
		EIFR = _BV(INTF6);
	}

	if (err)
		cmd_error(CMD_RET_FAILURE, err, NULL);

	if (!(options & O_SILENT)) {
		printf_P(PSTR("%ld%S\n"), cpu_freq, cpu_freq < 0 ? PSTR("") : PSTR("Hz"));
//		if (cpu_freq != 0)
//		else
//			printf_P(PSTR("No CPU clock or input frequency to low!\n"));
	}
#if 0
	if (options & O_WENV) {
		if (setenv_ulong(PSTR(ENV_CPU_FREQ), cpu_freq)) {
			if (!(options & O_SILENT))
				printf_P(PSTR("'SETENV (%S, %lu)' failed!\n"), PSTR(ENV_CPU_FREQ), cpu_freq);
			return CMD_RET_FAILURE;
		}
	}
#endif
	return CMD_RET_SUCCESS;
}


/*
 * command table for fat subcommands
 */

cmd_tbl_t cmd_tbl_cpu[] = {
CMD_TBL_ITEM(
	chkcpu,	CONFIG_SYS_MAXARGS,	CTBL_RPT,	do_cpuchk,
	"Check CPU",
	""
),
CMD_TBL_ITEM(
	buscmd,	CONFIG_SYS_MAXARGS,	CTBL_RPT,	do_bus_test,
	"Bus commands",
	""
),
CMD_TBL_ITEM(
	test,	CONFIG_SYS_MAXARGS,	1,	do_cpu_test,
	"Do bus request/release cycles",
	"[-t pulsewidth]"
),
CMD_TBL_ITEM(
	busack,	2,	1,	do_busack_test,
	"Get time from /Reset high to /BUSACK low",
	""
),
CMD_TBL_ITEM(
	freq,	CONFIG_SYS_MAXARGS,	1,	do_cpu_freq,
	"Measure cpu frequency",
	"[-qwn] [-c loopcycles] [-t timeout]\n"
	"     -q Be quiet\n"
//	"     -w  Write result to environment variable '"ENV_CPU_FREQ"'"
),

CMD_TBL_ITEM(
	help,	CONFIG_SYS_MAXARGS,	CTBL_RPT,	do_help,
	"Print sub command description/usage",
	"\n"
	"       - print brief description of all sub commands\n"
	"fat help command ...\n"
	"       - print detailed usage of sub cmd 'command'"
),

/* This does not use the CMD_TBL_ITEM macro as ? can't be used in symbol names */
	{FSTR("?"),   CONFIG_SYS_MAXARGS, 1, do_help,
	 NULL,
#ifdef  CONFIG_SYS_LONGHELP
	FSTR(""),
#endif /* CONFIG_SYS_LONGHELP */
	NULL,
#ifdef CONFIG_AUTO_COMPLETE
	NULL,
#endif
},
/* Mark end of table */
CMD_TBL_END(cmd_tbl_cpu)
};


command_ret_t do_cpu(cmd_tbl_t *cmdtp UNUSED, uint_fast8_t flag UNUSED, int argc UNUSED, char * const argv[] UNUSED)
{
	//puts_P(PSTR("Huch?"));

	return CMD_RET_USAGE;
}


#if 0		/* Z180 Single Step Functions */
/*
 * Z180 Single Step Functions
 *
 */


#define P_RUN		PORTG
#define RUN			1
#define DDR_RUN		DDRG
#define P_STEP		PORTG
#define STEP		0
#define DDR_STEP	DDRG
#define P_WAIT		PORTG
#define WAIT		2
#define DDR_WAIT	DDRG
/* All three signals are on the same Port (PortG) */
#define PORT_SS		PORTG
#define DDR_SS		DDRG
#define PIN_SS		PING

static bool ss_available;

int single_step_setup(void)
{
	ss_available = false;

#if 0
	if (z80_bus_state() & ZST_RUNNING ||
			!(z80_bus_cmd(Request) & ZST_ACQUIRED))
		return  -1;
#endif

	/* STEP, RUN output, WAIT input */

	PORT_SS |= _BV(RUN) | _BV(STEP);
	DDR_SS |= _BV(RUN) | _BV(STEP);
	DDR_SS &= ~_BV(WAIT);

	/* RUN high, MREQ pulse --> WAIT should be low */
	z80_mreq_pulse();

	if ((PIN_SS & _BV(WAIT)) == 0) {

		/* RUN high, STEP pulse --> WAIT should be high */
		PIN_SS = _BV(STEP);
		PIN_SS = _BV(STEP);
		if ((PIN_SS & _BV(WAIT)) != 0) {

			/* RUN high, MREQ pulse --> WAIT should be low */
			z80_mreq_pulse();
			if ((PIN_SS & _BV(WAIT)) == 0) {

				/* RUN low --> WAIT should be high */
				PIN_SS = _BV(RUN);
				if ((PIN_SS & _BV(WAIT)) != 0) {

					/* RUN low, STEP pulse --> WAIT should be high */
					PIN_SS = _BV(STEP);
					PIN_SS = _BV(STEP);
					if ((PIN_SS & _BV(WAIT)) != 0) {

						/* all tests passed */
						ss_available = true;
					}
				}
			}
		}
	}

	if (!ss_available) {
		DDR_SS &= ~(_BV(STEP) | _BV(RUN));
		PORT_SS |= _BV(RUN) | _BV(STEP);
	}

	return ss_available ? 0 : -1;
}
#endif
Commit	Line	Data
226d3221 L	1	/*
	2	* (C) Copyright 2018 Leo C. <erbl259-lmu@yahoo.de>
	3	*
	4	* SPDX-License-Identifier: GPL-2.0
	5	*/
	6
	7	#include "cmd_cpu.h"
	8	//#include <ctype.h>
dbc1de70	9	#include <util/atomic.h>
226d3221 L	10
	11	#include "z80-if.h"
	12	#include "con-utils.h"
	13	//#include "env.h"
51dd0948 L	14	#include "eval_arg.h"
	15	#include "timer.h"
	16	#include "getopt-min.h"
226d3221 L	17	//#include "debug.h"
	18
	19	/* hack to get Z180 loadfile into flash memory */
	20	#define const const FLASH
	21	#include "../z180/cpuinfo.h"
	22	#undef const
	23
	24
dbc1de70 L	25	/*
	26	* delay for <count> ms...
	27	*/
	28	static void test_delay(uint32_t count)
	29	{
	30	uint32_t ts = get_timer(0);
	31
	32	while (get_timer(ts) <= count);
	33	}
	34
	35	static int32_t z80_measure_phi(uint8_t cycles, bool input_clk, uint16_t wait_ms)
	36	{
	37	uint16_t ref_stop;
	38	uint16_t ref_ovfl;
	39	uint32_t x_freq;
	40
	41
	42	PRR1 &= ~_BV(PRTIM3);
	43	TCCR3A = 0;
	44	TCCR3B = 0b000<<CS30; /* stop counter */
	45	TCNT3 = 0;
	46	TIFR3 = _BV(TOV3);
	47	ref_ovfl = 0;
	48	ATOMIC_BLOCK(ATOMIC_FORCEON) {
	49	/* Reset pending int */
	50	EIFR = _BV(INTF6);
	51	/* Wait for falling edge */
	52	while ((EIFR & _BV(INTF6)) == 0)
	53	;
	54	//ref_start = TCNT4;
	55	OCR4B = TCNT4;
	56	TCCR3B = 0b110<<CS30; /* Count falling edges on T3 (==INT6) */
	57	TIFR4 = _BV(OCF4B); /* clear compare match flag */
	58	}
	59	while (ref_ovfl < 60) {
	60	ATOMIC_BLOCK(ATOMIC_FORCEON) {
	61	if ((TIFR4 & _BV(OCF4B)) != 0) {
	62	TIFR4 = _BV(OCF4B);
	63	ref_ovfl++;
	64	}
	65	}
	66	}
	67
	68	ATOMIC_BLOCK(ATOMIC_FORCEON) {
	69	EIFR = _BV(INTF6);
	70	for (;;) {
	71	if (EIFR & _BV(INTF6))
	72	break;
	73	if (TIFR4 & _BV(OCF4B)) {
	74	if (EIFR & _BV(INTF6))
	75	break;
	76	TIFR4 = _BV(OCF4B);
	77	if (EIFR & _BV(INTF6))
	78	break;
	79	ref_ovfl++;
	80	if (EIFR & _BV(INTF6))
	81	break;
	82	if (ref_ovfl == 0)
	83	break;
	84	}
	85	}
	86	ref_stop = TCNT4;
	87	TCCR3B = 0b000<<CS30; /* stop counter */
	88	if ((TIFR4 & _BV(OCF4B)) != 0) {
89	TIFR4 = _BV(OCF4B);
90	if (ref_ovfl)
91	ref_ovfl++;
92	}
93	}
94
95	if (ref_ovfl == 0)
96	x_freq = 0xFFFFFFFE;
97	else
98	{
99	uint32_t ref_cnt = (ref_stop - OCR4B) + ((uint32_t)ref_ovfl << 16);
100
101	x_freq = TCNT3; /* x_cnt (17 bit) */
102	if ((TIFR3 & _BV(TOV3)) != 0)
103	x_freq += 1UL << 16;
104	uint32_t x_cnt = x_freq;
105	if (input_clk) /* compute input clock */
106	x_freq *= 2;
107	x_freq *= cycles;
108
109	x_freq = ((uint64_t) x_freq * F_CPU + (ref_cnt / 2))/ ref_cnt;
110
111	printf_P(PSTR("ref_start: %6u, ref_stop: %6u, ref_ovfl: %4u, ref_cnt: %9lu\n"
112	" TCNT3: %6u, x_cnt: %6lu, cycles: %3u, xfreq: %9lu\n"),
113	OCR4B, ref_stop, ref_ovfl, ref_cnt,
114	TCNT3, x_cnt, cycles, x_freq);
115
116	/* round to 5 decimal digits */
117	uint8_t sc = 0;
118	while (x_freq >= 100000UL) {
119	x_freq = (x_freq + 5)/10;
120	++sc;
121	}
122	while (sc--)
123	x_freq *= 10;
124	}
125
126	/* Stop Timer */
127	TCCR3B = 0;
128	PRR1 \|= _BV(PRTIM3);
129
130	return (int32_t) x_freq;
131	}
132
133
226d3221 L	134	static const FLASH char * const FLASH cpu_strings[] = {
	135	FSTR("Unknown CPU"),
	136	FSTR("8080"),
	137	FSTR("8085"),
	138	FSTR("Z80"),
	139	FSTR("x180"),
	140	FSTR("HD64180"),
	141	FSTR("Z80180"),
	142	FSTR("Z80S180"),
	143	};
	144
	145	command_ret_t do_cpuchk(cmd_tbl_t cmdtp UNUSED, uint_fast8_t flag UNUSED, int argc UNUSED, char const argv[] UNUSED)
	146	{
	147	uint8_t done = 0;
	148	uint8_t cputype;
	149	ERRNUM err = ESUCCESS;
	150	uint8_t ram_save[cpuinfo_length];
	151
	152	if (z80_bus_state() & ZST_RUNNING) {
	153	err = ERUNNING;
	154	} else {
	155	z80_bus_request_or_exit();
	156	z80_read_block(ram_save, 0, cpuinfo_length);
	157	z80_load_mem(0, cpuinfo,
	158	&cpuinfo_sections,
	159	cpuinfo_address,
	160	cpuinfo_length_of_sections);
	161	z80_bus_cmd(Release);
	162
	163	if (argv[1] && (argv[1][0] == 'n'))
	164	goto donot;
	165
	166	z80_bus_cmd(Run);
	167
	168	clear_ctrlc(); /* forget any previous Control C */
	169	while (done != 0xFF) {
	170	_delay_ms(8);
	171	/* check for ctrl-c to abort... */
	172	if (had_ctrlc() \|\| ctrlc()) {
	173	err = EINTR;
	174	break;
	175	}
	176	z80_bus_cmd(Request);
	177	done = z80_read(3);
	178	if (done == 0xFF)
	179	cputype = z80_read(4);
	180	z80_bus_cmd(Release);
	181	}
	182	z80_bus_cmd(Reset);
	183	z80_bus_cmd(Request);
	184	// z80_write_block(ram_save, 0, cpuinfo_length);
	185	z80_bus_cmd(Release);
	186	}
	187
	188	donot:
	189
	190	if (err)
	191	cmd_error(CMD_RET_FAILURE, err, NULL);
	192
	193	if (done == 0xFF) {
	194	if (cputype >= ARRAY_SIZE(cpu_strings))
	195	cputype = 0;
	196	printf_P(PSTR("Detected CPU: %S\n"), cpu_strings[cputype]);
	197	}
198
199	return CMD_RET_SUCCESS;
200	}
51dd0948	201
51dd0948 L	202	command_ret_t do_cpu_test(cmd_tbl_t cmdtp UNUSED, uint_fast8_t flag UNUSED, int argc, char const argv[])
	203	{
	204
	205	uint32_t pulsewidth = 10; /* ms */
	206
	207	/* reset getopt() */
	208	optind = 0;
	209
	210	int opt;
	211	while ((opt = getopt(argc, argv, PSTR("t:"))) != -1) {
	212	switch (opt) {
	213	case 't':
	214	pulsewidth = eval_arg(optarg, NULL);
	215	break;
	216	default: /* '?' */
	217	return CMD_RET_USAGE;
	218	}
	219	}
	220
	221	if ((z80_bus_state() & ZST_ACQUIRED) != RESET)
	222	cmd_error(CMD_RET_FAILURE, ERUNNING, NULL);
	223
	224	clear_ctrlc(); /* forget any previous Control C */
	225	do {
	226	z80_bus_cmd(Request);
	227	test_delay(pulsewidth);
	228	z80_bus_cmd(Release);
	229	test_delay(pulsewidth);
	230	} while (!(had_ctrlc() \|\| ctrlc()));
	231
	232	return CMD_RET_SUCCESS;
	233	}
	234
dbc1de70 L	235	command_ret_t do_bus_test(cmd_tbl_t cmdtp UNUSED, uint_fast8_t flag UNUSED, int argc UNUSED, char const argv[] UNUSED)
	236	{
	237	char ch;
	238
	239	#if 0
	240	/* reset getopt() */
	241	optind = 0;
	242	int opt;
	243	while ((opt = getopt(argc, argv, PSTR("t:"))) != -1) {
	244	switch (opt) {
	245	case 't':
	246	pulsewidth = eval_arg(optarg, NULL);
	247	break;
	248	default: /* '?' */
	249	return CMD_RET_USAGE;
	250	}
	251	}
	252	#endif
	253
	254	my_puts_P(PSTR(
	255	" 1: RESET 4: RUN r: Toggle /RESET\n"
	256	" 2: REQUEST 5: RESTART b: Toggle /BUSREQ\n"
	257	" 3: RELEASE 6: M_CYCLE\n"
	258	"\n"
	259	//"Bus state: "
	260	));
	261
	262	do {
	263	ch = my_getchar(1);
	264	if (ch >= 0) {
	265	switch (ch) {
	266	case '1': /* bus_cmd RESET */
	267	case '2': /* bus_cmd REQUEST */
	268	case '3': /* bus_cmd RELEASE */
	269	case '4': /* bus_cmd RUN */
	270	case '5': /* bus_cmd RESTART */
	271	case '6': /* bus_cmd M_CYCLE */
	272	z80_bus_cmd(ch - '1' + Reset);
	273	break;
	274	case 'r': /* Toggle RESET */
	275	z80_toggle_reset();
	276	break;
	277	case 'b': /* Toggle BUSREQ */
	278	z80_toggle_busreq();
	279	break;
	280	}
	281	test_delay(10);
	282	uint32_t cycles = z80_get_busreq_cycles();
	283	printf_P(PSTR("\rState: %.2x, cycles: %lu, time: %luus "),
	284	z80_bus_state(), cycles, (uint32_t) (cycles * 1000000LL / F_CPU));
	285	}
	286	} while (ch != 0x03);
	287
	288	putchar('\n');
	289	return CMD_RET_SUCCESS;
	290	}
	291
d66348b4 L	292	command_ret_t do_busack_test(cmd_tbl_t cmdtp UNUSED, uint_fast8_t flag UNUSED, int argc UNUSED, char const argv[] UNUSED)
	293	{
	294
	295	if ((z80_bus_state() & ZST_ACQUIRED) != RESET)
	296	cmd_error(CMD_RET_FAILURE, ERUNNING, NULL);
	297
	298	z80_bus_cmd(Request);
	299	uint32_t result = z80_get_busreq_cycles();
	300	test_delay(20);
	301	z80_bus_cmd(Release);
	302
	303	#if 0
	304	long div;
	305
	306	pinconf = gpio_config_get(pin);
	307	if (pinconf == OUTPUT_TIMER) {
	308	div = gpio_clockdiv_get(pin);
dbc1de70	309	}
d66348b4 L	310	#endif
	311
	312
	313	printf_P(PSTR("cycles: %lu, time: %luus\n"), result, (uint32_t) (result * 1000000LL / F_CPU));
	314
	315	return CMD_RET_SUCCESS;
	316	}
	317
dbc1de70	318	command_ret_t do_cpu_freq(cmd_tbl_t cmdtp UNUSED, uint_fast8_t flag UNUSED, int argc, char const argv[])
51dd0948	319	{
dbc1de70 L	320
	321	#define O_SILENT (1<<0)
	322	#define O_WENV (1<<1)
	323	#define O_LOAD_LOOP (1<<2)
	324	#define O_UNLOAD_LOOP (1<<3)
	325
	326	uint_fast8_t options = O_LOAD_LOOP \| O_UNLOAD_LOOP;
51dd0948 L	327	uint8_t lcycles = 18;
	328	uint16_t timeout = 1000;
	329
	330	uint8_t eicrb_save;
	331	uint8_t eimsk_save;
	332	uint8_t mem_save[cpuinfo_length];
	333
	334	/* reset getopt() */
	335	optind = 0;
	336
	337	int opt;
dbc1de70	338	while ((opt = getopt(argc, argv, PSTR("swnuc:t:"))) != -1) {
51dd0948 L	339	switch (opt) {
51dd0948 L	340	case 's':
dbc1de70	341	options \|= O_SILENT;
51dd0948 L	342	break;
51dd0948 L	343	case 'w':
dbc1de70	344	options \|= O_WENV;
51dd0948 L	345	break;
51dd0948 L	346	case 'n':
dbc1de70 L	347	options &= ~O_LOAD_LOOP;
	348	break;
	349	case 'u':
	350	options &= ~O_UNLOAD_LOOP;
51dd0948 L	351	break;
	352	case 'c':
	353	lcycles = eval_arg(optarg, NULL);
	354	break;
	355	case 't':
dbc1de70	356	timeout = eval_arg(optarg, NULL);
51dd0948 L	357	break;
	358	default: /* '?' */
	359	return CMD_RET_USAGE;
	360	}
	361	}
dbc1de70 L	362	if (argc - optind != 0)
dbc1de70 L	363	return CMD_RET_USAGE;
51dd0948 L	364
51dd0948 L	365	if (z80_bus_state() & ZST_RUNNING) {
dbc1de70	366	if (!(options & O_SILENT))
51dd0948 L	367	printf_P(PSTR("Frequency measuring failed. CPU allready running!\n"));
	368	return CMD_RET_FAILURE;
	369	}
	370
	371	ATOMIC_BLOCK(ATOMIC_FORCEON) {
	372	/* Save state and disable INT6 */
	373	eimsk_save = EIMSK;
	374	EIMSK &= ~_BV(INT6);
	375	/* Save state and set INT6 for falling edge */
	376	eicrb_save = EICRB;
	377	EICRB = (eicrb_save & ~(0b11 << ISC60)) \| (0b10 << ISC60);
	378	}
	379
	380	z80_bus_cmd(Request);
dbc1de70	381	if (options & O_LOAD_LOOP) {
51dd0948 L	382	z80_read_block(mem_save, 0, cpuinfo_length);
	383	z80_load_mem(0, cpuinfo,
	384	&cpuinfo_sections,
	385	cpuinfo_address,
	386	cpuinfo_length_of_sections);
	387	}
dbc1de70	388	Stat &= ~S_IO_0X40; /* Reset pending int */
51dd0948	389	z80_bus_cmd(Release);
dbc1de70	390	z80_bus_cmd(Run);
51dd0948	391
dbc1de70 L	392	clear_ctrlc(); /* forget any previous Control C */
	393	ERRNUM err = 0;
	394
	395	/* Wait for falling edge */
	396	do {
	397	/* check for ctrl-c to abort... */
	398	if (had_ctrlc() \|\| ctrlc()) {
	399	err = EINTR;
	400	break;
	401	}
	402	} while ((Stat & S_IO_0X40) == 0);
	403
	404	int32_t cpu_freq;
	405	if (!err)
	406	cpu_freq = z80_measure_phi(lcycles, false, timeout);
51dd0948 L	407
51dd0948 L	408	z80_bus_cmd(Reset);
dbc1de70 L	409	if (options & O_UNLOAD_LOOP) {
dbc1de70 L	410	z80_bus_cmd(Request);
51dd0948	411	z80_write_block(mem_save, 0, cpuinfo_length);
dbc1de70 L	412	z80_bus_cmd(Release);
dbc1de70 L	413	}
51dd0948 L	414	ATOMIC_BLOCK(ATOMIC_FORCEON) {
	415	/* Restore INT6 */
	416	eicrb_save = EICRB;
	417	EICRB = (EICRB & ~(0b11 << ISC60)) \| (eicrb_save & (0b11 << ISC60));
	418	if ((eimsk_save & _BV(INT6)) != 0)
	419	EIMSK \|= _BV(INT6);
	420	/* Reset pending int */
	421	EIFR = _BV(INTF6);
	422	}
	423
dbc1de70 L	424	if (err)
dbc1de70 L	425	cmd_error(CMD_RET_FAILURE, err, NULL);
51dd0948	426
dbc1de70 L	427	if (!(options & O_SILENT)) {
	428	printf_P(PSTR("%ld%S\n"), cpu_freq, cpu_freq < 0 ? PSTR("") : PSTR("Hz"));
	429	// if (cpu_freq != 0)
	430	// else
	431	// printf_P(PSTR("No CPU clock or input frequency to low!\n"));
	432	}
	433	#if 0
	434	if (options & O_WENV) {
51dd0948	435	if (setenv_ulong(PSTR(ENV_CPU_FREQ), cpu_freq)) {
dbc1de70	436	if (!(options & O_SILENT))
51dd0948 L	437	printf_P(PSTR("'SETENV (%S, %lu)' failed!\n"), PSTR(ENV_CPU_FREQ), cpu_freq);
	438	return CMD_RET_FAILURE;
	439	}
	440	}
dbc1de70	441	#endif
51dd0948 L	442	return CMD_RET_SUCCESS;
51dd0948 L	443	}
dbc1de70	444
51dd0948 L	445
	446	/*
	447	* command table for fat subcommands
	448	*/
	449
	450	cmd_tbl_t cmd_tbl_cpu[] = {
	451	CMD_TBL_ITEM(
	452	chkcpu, CONFIG_SYS_MAXARGS, CTBL_RPT, do_cpuchk,
	453	"Check CPU",
	454	""
	455	),
dbc1de70 L	456	CMD_TBL_ITEM(
	457	buscmd, CONFIG_SYS_MAXARGS, CTBL_RPT, do_bus_test,
	458	"Bus commands",
	459	""
	460	),
51dd0948 L	461	CMD_TBL_ITEM(
	462	test, CONFIG_SYS_MAXARGS, 1, do_cpu_test,
	463	"Do bus request/release cycles",
	464	"[-t pulsewidth]"
	465	),
d66348b4 L	466	CMD_TBL_ITEM(
	467	busack, 2, 1, do_busack_test,
	468	"Get time from /Reset high to /BUSACK low",
	469	""
	470	),
51dd0948 L	471	CMD_TBL_ITEM(
	472	freq, CONFIG_SYS_MAXARGS, 1, do_cpu_freq,
	473	"Measure cpu frequency",
dbc1de70 L	474	"[-qwn] [-c loopcycles] [-t timeout]\n"
	475	" -q Be quiet\n"
	476	// " -w Write result to environment variable '"ENV_CPU_FREQ"'"
51dd0948	477	),
dbc1de70	478
51dd0948 L	479	CMD_TBL_ITEM(
	480	help, CONFIG_SYS_MAXARGS, CTBL_RPT, do_help,
	481	"Print sub command description/usage",
	482	"\n"
	483	" - print brief description of all sub commands\n"
	484	"fat help command ...\n"
	485	" - print detailed usage of sub cmd 'command'"
	486	),
	487
	488	/* This does not use the CMD_TBL_ITEM macro as ? can't be used in symbol names */
	489	{FSTR("?"), CONFIG_SYS_MAXARGS, 1, do_help,
	490	NULL,
	491	#ifdef CONFIG_SYS_LONGHELP
	492	FSTR(""),
	493	#endif /* CONFIG_SYS_LONGHELP */
	494	NULL,
	495	#ifdef CONFIG_AUTO_COMPLETE
	496	NULL,
	497	#endif
	498	},
	499	/* Mark end of table */
	500	CMD_TBL_END(cmd_tbl_cpu)
	501	};
	502
	503
	504	command_ret_t do_cpu(cmd_tbl_t cmdtp UNUSED, uint_fast8_t flag UNUSED, int argc UNUSED, char const argv[] UNUSED)
	505	{
	506	//puts_P(PSTR("Huch?"));
	507
	508	return CMD_RET_USAGE;
	509	}
	510
	511
dbc1de70	512	#if 0 /* Z180 Single Step Functions */
51dd0948 L	513	/*
	514	* Z180 Single Step Functions
	515	*
	516	*/
	517
	518
	519	#define P_RUN PORTG
	520	#define RUN 1
	521	#define DDR_RUN DDRG
	522	#define P_STEP PORTG
	523	#define STEP 0
	524	#define DDR_STEP DDRG
	525	#define P_WAIT PORTG
	526	#define WAIT 2
	527	#define DDR_WAIT DDRG
	528	/* All three signals are on the same Port (PortG) */
	529	#define PORT_SS PORTG
	530	#define DDR_SS DDRG
	531	#define PIN_SS PING
	532
	533	static bool ss_available;
	534
	535	int single_step_setup(void)
	536	{
	537	ss_available = false;
	538
	539	#if 0
	540	if (z80_bus_state() & ZST_RUNNING \|\|
	541	!(z80_bus_cmd(Request) & ZST_ACQUIRED))
	542	return -1;
	543	#endif
	544
	545	/* STEP, RUN output, WAIT input */
	546
	547	PORT_SS \|= _BV(RUN) \| _BV(STEP);
	548	DDR_SS \|= _BV(RUN) \| _BV(STEP);
	549	DDR_SS &= ~_BV(WAIT);
	550
	551	/* RUN high, MREQ pulse --> WAIT should be low */
	552	z80_mreq_pulse();
	553
	554	if ((PIN_SS & _BV(WAIT)) == 0) {
	555
	556	/* RUN high, STEP pulse --> WAIT should be high */
	557	PIN_SS = _BV(STEP);
	558	PIN_SS = _BV(STEP);
	559	if ((PIN_SS & _BV(WAIT)) != 0) {
	560
	561	/* RUN high, MREQ pulse --> WAIT should be low */
	562	z80_mreq_pulse();
	563	if ((PIN_SS & _BV(WAIT)) == 0) {
	564
	565	/* RUN low --> WAIT should be high */
	566	PIN_SS = _BV(RUN);
	567	if ((PIN_SS & _BV(WAIT)) != 0) {
	568
	569	/* RUN low, STEP pulse --> WAIT should be high */
	570	PIN_SS = _BV(STEP);
	571	PIN_SS = _BV(STEP);
	572	if ((PIN_SS & _BV(WAIT)) != 0) {
	573
	574	/* all tests passed */
	575	ss_available = true;
	576	}
577	}
578	}
579	}
580	}
581
582	if (!ss_available) {
583	DDR_SS &= ~(_BV(STEP) \| _BV(RUN));
584	PORT_SS \|= _BV(RUN) \| _BV(STEP);
585	}
586
587	return ss_available ? 0 : -1;
588	}
589	#endif