Fix pio_blink frequency calculation

urish · kilograham · commit 34c3ade43e8c · 2021-07-12T09:05:47.000-05:00
Added missing parenthesis around the divisor. Verified using a logic analyzer and also in simulation: https://wokwi.com/arduino/projects/300911723685085709
diff --git a/pio/pio_blink/blink.c b/pio/pio_blink/blink.c
@@ -31,5 +31,5 @@ void blink_pin_forever(PIO pio, uint sm, uint offset, uint pin, uint freq) {
     pio_sm_set_enabled(pio, sm, true);
 
     printf("Blinking pin %d at %d Hz\n", pin, freq);
-    pio->txf[sm] = clock_get_hz(clk_sys) / 2 * freq;
+    pio->txf[sm] = clock_get_hz(clk_sys) / (2 * freq);
 }

Original file line number	Diff line number	Diff line change
`@@ -31,5 +31,5 @@ void blink_pin_forever(PIO pio, uint sm, uint offset, uint pin, uint freq) {`
`31`	`31`	`pio_sm_set_enabled(pio, sm, true);`
`32`	`32`
`33`	`33`	`printf("Blinking pin %d at %d Hz\n", pin, freq);`
`34`		`- pio->txf[sm] = clock_get_hz(clk_sys) / 2 * freq;`
	`34`	`+ pio->txf[sm] = clock_get_hz(clk_sys) / (2 * freq);`
`35`	`35`	`}`