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Add ^F command to measure and show frequency in hertz

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This commit is contained in:
Satoshi N. M 2018-01-15 14:17:51 -08:00
parent 7612198f41
commit 01a0f0f63c
2 changed files with 23 additions and 1 deletions
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1
README.md
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@ -22,6 +22,7 @@ Special commands built-in, not passed to the ACIA and 6502:
| --------- | ------ |
| ^V | Show `pill_6502` version |
| ^P | Pause/resume 6502 processor execution |
| ^F | Show frequency |
| ^R | Reset the 6502 processor (also reset on USB reset) |
| ^E | Local echo toggle, off by default |
| ^T | Show clock ticks and instruction count |

23
src/main.c
View File

@ -84,9 +84,11 @@ static const char *usb_strings[] = {
};
static bool paused = true;
uint32_t millis = 0;
void sys_tick_handler(void)
{
if (paused) return;
++millis;
step6502();
gpio_toggle(GPIOC, GPIO13);
}
@ -110,6 +112,25 @@ char *process_serial_command(char b) {
} else if (b == '\x10') { // ^P
paused = !paused;
return paused ? "paused" : "resumed";
} else if (b == '\x06') { // ^F
static uint32_t last_ticks = 0;
static uint32_t last_millis = 0;
if (last_ticks == 0) {
last_ticks = clockticks6502;
last_millis = millis;
return "press ^F again to measure frequency";
}
uint32_t hz = (clockticks6502 - last_ticks) * 1000 / (millis - last_millis);
static char buf[64];
snprintf(buf, sizeof(buf), "%ld Hz", hz);
last_ticks = clockticks6502;
last_millis = millis;
return buf;
} else if (b == '\x12') { // ^R
reset6502();
paused = false;
@ -122,7 +143,7 @@ char *process_serial_command(char b) {
snprintf(buf, sizeof(buf), "%ld ticks\r\n%ld instructions", clockticks6502, instructions);
return buf;
} else if (b == '\x07') { // ^G
return "^V=version ^R=reset ^E=echo ^P=pause ^T=ticks ^G=help";
return "^V=version ^R=reset ^E=echo ^P=pause ^F=freq ^T=ticks ^G=help";
}
return NULL;