fw/calypso/dsp: Add comment about meaning of bit 11 of ndb->d_tch_mode

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>

diff --git a/src/target/firmware/calypso/dsp.c b/src/target/firmware/calypso/dsp.c
index 5de7ee6..86adc55 100644 (file)
--- a/src/target/firmware/calypso/dsp.c
+++ b/src/target/firmware/calypso/dsp.c
@@ -420,7 +420,7 @@ static void dsp_ndb_init(void)
        ndb->a_fd[0]    = (1<<B_FIRE1);
        ndb->a_fd[2]    = 0xffff;
        ndb->d_a5mode   = 0;
-       ndb->d_tch_mode = 0x0800;
+       ndb->d_tch_mode = 0x0800; /* Set ABB model to Iota */
 
        #define GUARD_BITS 8 // 11 or 9 for TSM30, 7 for Freerunner
        ndb->d_tch_mode |= (((GUARD_BITS - 4) & 0x000F) << 7); //Bit 7..10: guard bits