andrzej-kaczmarek commented on a change in pull request #2392:
URL: https://github.com/apache/mynewt-core/pull/2392#discussion_r507747562
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File path: hw/drivers/crypto/crypto_da1469x/src/crypto_da1469x.c
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@@ -73,7 +74,10 @@ do_dma_key_tx(const void *key, uint16_t keylen)
da1469x_otp_set_mode(OTPC_MODE_READ);
/* securely DMA hardware key from secret storage to QSPI decrypt engine */
- dma_regs->DMA_REQ_MUX_REG |= 0xf000;
+ OS_ENTER_CRITICAL(sr);
+ /* Use the secure channel #7 */
+ MCU_DMA_SET_MUX(7, MCU_DMA_PERIPH_NONE);
Review comment:
> I do think the macro should remain local and
`da1469x_dma_acquire_xxx()` and `da1469x_dma_release_channel()` should be used
instead of accessing `DMA_REQ_MUX_REG` directly (e.g. crypto driver should use
these calls for channel 7 with the macro fixed).
agree, acquire/release should be used since it also keeps track of used
channels internally. if some pieces of code manually modify mux register,
things may not works as expected... so if there's something that
acquire/release does not do it should be fixed there
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