From 240615bbbcac3133f66298f9427366d4f2c10e1d Mon Sep 17 00:00:00 2001
From: "Luke T. Shumaker" <lukeshu@lukeshu.com>
Date: Fri, 4 Apr 2025 23:20:03 -0600
Subject: libhw: hwspi: Improve comments and asserts

---
 libhw_cr/rp2040_dma.h | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'libhw_cr/rp2040_dma.h')

diff --git a/libhw_cr/rp2040_dma.h b/libhw_cr/rp2040_dma.h
index e295adf..c7f5a8f 100644
--- a/libhw_cr/rp2040_dma.h
+++ b/libhw_cr/rp2040_dma.h
@@ -11,6 +11,7 @@
 #define _LIBHW_CR_RP2040_DMA_H_
 
 #include <assert.h>
+#include <stddef.h> /* for offsetof() */
 #include <stdint.h> /* for uint32_t */
 
 #include <hardware/regs/dreq.h>   /* for DREQ_* for use with DMA_CTRL_TREQ_SEL() */
@@ -105,6 +106,8 @@ struct dma_alias3_short3                                  { READ_ADDR   ; };
 	struct dma_alias2_short3: &dma_channel_hw_addr(CH)->al2_write_addr_trig,     \
 	struct dma_alias3_short3: &dma_channel_hw_addr(CH)->al3_read_addr_trig))
 
+#define DMA_IS_TRIGGER(TYP, FIELD) (offsetof(TYP, FIELD) == 0xC)
+
 #define DMA_CHAN_WR_TRANS_COUNT(TYP) \
 	(sizeof(TYP)/4)
 
-- 
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