Bug fix in RP2xxx fifo level readback

Kytezign · web-flow · commit 3a01fd81e31e · 2026-04-11T06:34:38.000-07:00
tx+rx is 8 bits per snum (4 bits each).
diff --git a/port/raspberrypi/rp2xxx/src/hal/pio/common.zig b/port/raspberrypi/rp2xxx/src/hal/pio/common.zig
@@ -426,7 +426,7 @@ pub fn PioImpl(EnumType: type, chip: Chip) type {
             const regs = self.get_regs();
             const levels = regs.FLEVEL.raw;
 
-            return @as(u4, @truncate(levels >> (@as(u5, 4) * snum) + offset));
+            return @as(u4, @truncate(levels >> (@as(u5, 8) * snum) + offset));
         }
 
         fn interrupt_bit_pos(

Original file line number	Diff line number	Diff line change
`@@ -426,7 +426,7 @@ pub fn PioImpl(EnumType: type, chip: Chip) type {`
`426`	`426`	`const regs = self.get_regs();`
`427`	`427`	`const levels = regs.FLEVEL.raw;`
`428`	`428`
`429`		`- return @as(u4, @truncate(levels >> (@as(u5, 4) * snum) + offset));`
	`429`	`+ return @as(u4, @truncate(levels >> (@as(u5, 8) * snum) + offset));`
`430`	`430`	`}`
`431`	`431`
`432`	`432`	`fn interrupt_bit_pos(`