#include "../z180/cpuinfo.h"
#undef const
+#define DEBUG_CPU 1 /* set to 1 to debug */
+
+#define debug_cpu(fmt, args...) \
+ debug_cond(DEBUG_CPU, fmt, ##args)
+
/*
* delay for <count> ms...
while (get_timer(ts) <= count);
}
-static int32_t z80_measure_phi(uint8_t cycles, uint16_t wait_ms)
+static uint32_t z80_measure_phi(uint_fast8_t cycles)
{
uint16_t ref_stop;
uint16_t ref_ovfl;
+ uint8_t x_ovfl;
uint32_t x_freq;
- uint8_t eimsk_save,eicrb_save;
- 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);
- }
-
PRR1 &= ~_BV(PRTIM3);
TCCR3A = 0;
TCCR3B = 0b000<<CS30; /* stop counter */
TCNT3 = 0;
+ x_ovfl = 0;
TIFR3 = _BV(TOV3);
ref_ovfl = 0;
/* Wait for falling edge */
while ((EIFR & _BV(INTF6)) == 0)
;
- OCR4B = TCNT4;
TCCR3B = 0b110<<CS30; /* Count falling edges on T3 (==INT6) */
+ OCR4B = TCNT4;
TIFR4 = _BV(OCF4B); /* clear compare match flag */
}
while (ref_ovfl < 60) {
TIFR4 = _BV(OCF4B);
ref_ovfl++;
}
+ if ((TIFR3 & _BV(TOV3)) != 0) {
+ TIFR3 = _BV(TOV3);
+ x_ovfl++;
+ }
}
}
ATOMIC_BLOCK(ATOMIC_FORCEON) {
EIFR = _BV(INTF6);
for (;;) {
- if (EIFR & _BV(INTF6))
+ if (EIFR & _BV(INTF6)) {
+ TCCR3B = 0b000<<CS30; /* stop counter */
+ ref_stop = TCNT4;
break;
- if (TIFR4 & _BV(OCF4B)) {
- if (EIFR & _BV(INTF6))
- break;
+ }
+ if ((TIFR4 & _BV(OCF4B)) != 0) {
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;
- x_freq *= cycles;
-
- x_freq = ((uint64_t) x_freq * getenv_ulong(PSTR(ENV_FMON), 10, F_CPU) + (ref_cnt / 2))/ ref_cnt;
-
- debug("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;
+ if ((TIFR3 & _BV(TOV3)) != 0) {
+ TIFR3 = _BV(TOV3);
+ x_ovfl++;
+ }
+
+ uint32_t ref_cnt = (ref_stop - OCR4B) + ((uint32_t)ref_ovfl << 16);
+ uint32_t x_cnt = TCNT3 + ((uint32_t) x_ovfl << 16);
+ uint64_t x_tmp = (uint64_t) 100000 * (x_cnt * cycles);
+
+ debug_cpu("TCNT3: %6u, ref_cnt: %9lu\n", TCNT3, ref_cnt);
+ debug_cpu("x_tmp: %lu %lu\n", (uint32_t) (x_tmp >> 32), (uint32_t) (x_tmp & 0xffffffff));
+
+ x_tmp = (x_tmp * getenv_ulong(PSTR(ENV_FMON), 10, F_CPU) + (ref_cnt / 2)) / ref_cnt;
+
+ debug_cpu("x_tmp: %lu %lu\n", (uint32_t) (x_tmp >> 32), (uint32_t) (x_tmp & 0xffffffff));
+
+ /* round to 5 decimal digits */
+ int_fast8_t sc = 5;
+ while (sc > 0 || x_tmp >= 100000) {
+ x_tmp = (x_tmp + 5)/10;
+ sc--;
+ }
+ x_freq = x_tmp;
+ while (sc < 0) {
+ x_freq *= 10;
+ sc++;
}
/* Stop Timer */
TCCR3B = 0;
PRR1 |= _BV(PRTIM3);
+ return x_freq;
+}
+
+static const FLASH uint8_t loop_code[] = {
+/* 0000 */ 0x00, /* nop */
+/* 0001 */ 0xAF, /* xor a */
+/* 0005 */ 0xD3,0x32, /* out (032h),a ;DCNTL */
+/* 0002 */ 0xD3,0x36, /* out (036h),a ;RCR */
+/* */ /* */
+/* 0006 */ 0xD3,0x40, /* out (040H),a ;Ready */
+/* */ /* */
+/* */ /* ;Z80 Z180(0W) Z180(MaxW) */
+/* 0008 */ /* loop: ;-------------------------- */
+/* 0008 */ 0xDB,0x50, /* in a,(050h) ;11 10 +3*3 19 */
+/* 000A */ 0xC3,0x08,0x00 /* jp loop ;10 9 +3*3 18 */
+ /* ;-------------------------- */
+ /* ;21 19 37 */
+};
+
+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;
+ uint_fast8_t lcycles = 19;
+ uint16_t timeout = 1000;
+ uint8_t eimsk_save;
+
+ uint8_t mem_save[ARRAY_SIZE(loop_code)];
+
+ 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) {
- /* Restore INT6 */
-#if 0 /* wtf? */
- eicrb_save = EICRB;
- EICRB = (EICRB & ~(0b11 << ISC60)) | (eicrb_save & (0b11 << ISC60));
-#endif
- EICRB = eicrb_save;
+ /* Save state and disable INT5/INT6 */
+ eimsk_save = EIMSK;
+ EIMSK &= ~_BV(INT6);
+ EIMSK &= ~_BV(INT5);
+ }
+
+ z80_bus_cmd(Request);
+ if (options & O_LOAD_LOOP) {
+ z80_read_block(mem_save, 0, ARRAY_SIZE(loop_code));
+ z80_write_block_P(loop_code, 0, ARRAY_SIZE(loop_code));
+ }
+ EIFR = _BV(INTF5); /* 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 ((EIFR & _BV(INTF5)) == 0);
+
+ uint32_t cpu_freq = 0;
+ if (!err)
+ cpu_freq = z80_measure_phi(lcycles);
+
+ z80_bus_cmd(Reset);
+ if (options & O_UNLOAD_LOOP) {
+ z80_bus_cmd(Request);
+ z80_write_block(mem_save, 0, ARRAY_SIZE(loop_code));
+ z80_bus_cmd(Release);
+ }
+ ATOMIC_BLOCK(ATOMIC_FORCEON) {
+ /* Restore INT5/INT6 */
+ if ((eimsk_save & _BV(INT5)) != 0)
+ EIMSK |= _BV(INT5);
if ((eimsk_save & _BV(INT6)) != 0)
EIMSK |= _BV(INT6);
/* Reset pending int */
+ EIFR = _BV(INTF5);
EIFR = _BV(INTF6);
}
- return (int32_t) x_freq;
-}
+ Stat &= ~S_MSG_PENDING;
+ Stat &= ~S_CON_PENDING;
+ if (err)
+ cmd_error(CMD_RET_FAILURE, err, NULL);
+
+ if (!(options & O_SILENT)) {
+ uint8_t sc = cpu_freq >> 28;
+ printf_P(PSTR("%lu %3u\n"), cpu_freq & 0x0fffffff, sc);
+ }
+#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;
+}
static const FLASH char * const FLASH cpu_strings[] = {
- FSTR("Unknown CPU"),
+ FSTR("Unknown"),
FSTR("8080"),
FSTR("8085"),
FSTR("Z80"),
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;
+ uint_fast8_t cputype = 0;
ERRNUM err = ESUCCESS;
+ uint8_t eimsk_save;
uint8_t ram_save[cpuinfo_length];
if (z80_bus_state() & ZST_RUNNING) {
if (argv[1] && (argv[1][0] == 'n'))
goto donot;
+ ATOMIC_BLOCK(ATOMIC_FORCEON) {
+ /* Save state and disable INT5/INT6 */
+ eimsk_save = EIMSK;
+ EIMSK &= ~_BV(INT6);
+ EIMSK &= ~_BV(INT5);
+ }
+ EIFR = _BV(INTF5); /* Reset pending int */
z80_bus_cmd(Run);
clear_ctrlc(); /* forget any previous Control C */
- while (done != 0xFF) {
- _delay_ms(8);
+ do {
/* 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);
- }
+ } while ((EIFR & _BV(INTF5)) == 0);
z80_bus_cmd(Reset);
+ ATOMIC_BLOCK(ATOMIC_FORCEON) {
+ /* Restore INT5/INT6 */
+ if ((eimsk_save & _BV(INT5)) != 0)
+ EIMSK |= _BV(INT5);
+ if ((eimsk_save & _BV(INT6)) != 0)
+ EIMSK |= _BV(INT6);
+ /* Reset pending int */
+ EIFR = _BV(INTF5);
+ EIFR = _BV(INTF6);
+ }
+ Stat &= ~S_MSG_PENDING;
+ Stat &= ~S_CON_PENDING;
z80_bus_cmd(Request);
-// z80_write_block(ram_save, 0, cpuinfo_length);
+ if (z80_read(3) == 0xFF) {
+ cputype = z80_read(4);
+ }
+ z80_write_block(ram_save, 0, cpuinfo_length);
z80_bus_cmd(Release);
}
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]);
- }
+ 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_bus_test(cmd_tbl_t *cmdtp UNUSED, uint_fast8_t flag UNUSED, int argc UNUSED, char * const argv[] UNUSED)
{
- char ch;
+ int ch;
#if 0
int opt;
return CMD_RET_SUCCESS;
}
-static const FLASH uint8_t loop_code[] = {
- /* 0000 */ 0x01,0x36,0x00, /* ld bc,00*256+RCR ; no refresh cycles */
- /* 0003 */ 0xAF, /* xor a */
- /* 0004 */ 0xED,0x79, /* out (c),a */
- /* 0006 */ 0xD3,0x40, /* out (040H),a ; ready */
- /* */ /* */
- /* */ /* ;Z80 Z180(0W) Z180(MaxW) */
- /* 0008 */ /* loop: ;-------------------------- */
- /* 0008 */ 0xDB,0x50, /* in a,(050h) ;11 10 +3*3 19 */
- /* 000A */ 0xC3,0x08,0x00 /* jp loop ;10 9 +3*3 18 */
- /* ;-------------------------- */
- /* ;21 19 37 */
-};
-
-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 mem_save[ARRAY_SIZE(loop_code)];
-
- 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;
- }
-
-
- z80_bus_cmd(Request);
- if (options & O_LOAD_LOOP) {
- z80_read_block(mem_save, 0, ARRAY_SIZE(loop_code));
- z80_write_block_P(loop_code, 0, ARRAY_SIZE(loop_code));
- }
- 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, timeout);
-
- z80_bus_cmd(Reset);
- if (options & O_UNLOAD_LOOP) {
- z80_bus_cmd(Request);
- z80_write_block(mem_save, 0, ARRAY_SIZE(loop_code));
- z80_bus_cmd(Release);
- }
- 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
+ * command table for subcommands
*/
cmd_tbl_t cmd_tbl_cpu[] = {
CMD_TBL_ITEM(
- chkcpu, CONFIG_SYS_MAXARGS, CTBL_RPT, do_cpuchk,
- "Check CPU",
+ chkcpu, CONFIG_SYS_MAXARGS, CTBL_RPT|CTBL_SUBCMDAUTO, do_cpuchk,
+ "Check/Identify CPU",
""
),
CMD_TBL_ITEM(
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