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-rw-r--r--src/stm/ao_dma_stm.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/stm/ao_dma_stm.c b/src/stm/ao_dma_stm.c
index 298a15b5..93b7fb47 100644
--- a/src/stm/ao_dma_stm.c
+++ b/src/stm/ao_dma_stm.c
@@ -64,7 +64,7 @@ ao_dma_set_transfer(uint8_t index,
if (ao_dma_allocated[index]) {
if (ao_dma_mutex[index])
ao_panic(AO_PANIC_DMA);
- ao_dma_mutex[index] = 1;
+ ao_dma_mutex[index] = 0xff;
} else
ao_mutex_get(&ao_dma_mutex[index]);
ao_arch_critical(