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Fix: SWD to JTAG sequence #1443

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merged 2 commits into from
Apr 10, 2023
Merged

Fix: SWD to JTAG sequence #1443

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43f9af2
common/jtagtap: Turns out that the = in `i <= 50` in jtagtap_init() i…
dragonmux Apr 7, 2023
7c69235
hosted/libftdi_jtagtap: Turns out that the = in `i <= 50` in jtagtap_…
dragonmux Apr 7, 2023
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4 changes: 2 additions & 2 deletions src/platforms/common/jtagtap.c
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Original file line number Diff line number Diff line change
Expand Up @@ -50,8 +50,8 @@ void jtagtap_init(void)
jtag_proc.tap_idle_cycles = 1;

/* Ensure we're in JTAG mode */
for (size_t i = 0; i < 50U; ++i)
jtagtap_next(true, false); /* 50 idle cylces for SWD reset */
for (size_t i = 0; i <= 50U; ++i)
jtagtap_next(true, false); /* 50 + 1 idle cycles for SWD reset */
jtagtap_tms_seq(0xe73cU, 16U); /* SWD to JTAG sequence */
}

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4 changes: 2 additions & 2 deletions src/platforms/hosted/libftdi_jtagtap.c
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Expand Up @@ -102,8 +102,8 @@ bool ftdi_jtag_init(void)
ftdi_jtag_drain_potential_garbage();

/* Ensure we're in JTAG mode */
for (size_t i = 0; i < 50U; ++i)
ftdi_jtag_next(true, false); /* 50 idle cycles for SWD reset */
for (size_t i = 0; i <= 50U; ++i)
ftdi_jtag_next(true, false); /* 50 + 1 idle cycles for SWD reset */
ftdi_jtag_tms_seq(0xe73cU, 16U); /* SWD to JTAG sequence */
return true;
}
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