tcl/target: stm32[fl]4x: document the settings for trace

[fw/openocd] / tcl / target / stm32f4x.cfg

diff --git a/tcl/target/stm32f4x.cfg b/tcl/target/stm32f4x.cfg
index befd28863410264f02bba4a7aa098d7bebc4b1d0..35d8275b553be1cc602a6668fb9262a9399b31b8 100644 (file)
--- a/tcl/target/stm32f4x.cfg
+++ b/tcl/target/stm32f4x.cfg
@@ -100,18 +100,21 @@ proc _proc_pre_enable_$_CHIPNAME.tpiu {_chipname} {
        if { [$_chipname.tpiu cget -protocol] eq "sync" } {
                switch [$_chipname.tpiu cget -port-width] {
                        1 {
+                               # Set TRACE_IOEN; TRACE_MODE to sync 1 bit; GPIOE[2-3] to AF0
                                mmw 0xE0042004 0x00000060 0x000000c0
                                mmw 0x40021020 0x00000000 0x0000ff00
                                mmw 0x40021000 0x000000a0 0x000000f0
                                mmw 0x40021008 0x000000f0 0x00000000
                          }
                        2 {
+                               # Set TRACE_IOEN; TRACE_MODE to sync 2 bit; GPIOE[2-4] to AF0
                                mmw 0xE0042004 0x000000a0 0x000000c0
                                mmw 0x40021020 0x00000000 0x000fff00
                                mmw 0x40021000 0x000002a0 0x000003f0
                                mmw 0x40021008 0x000003f0 0x00000000
                          }
                        4 {
+                               # Set TRACE_IOEN; TRACE_MODE to sync 4 bit; GPIOE[2-6] to AF0
                                mmw 0xE0042004 0x000000e0 0x000000c0
                                mmw 0x40021020 0x00000000 0x0fffff00
                                mmw 0x40021000 0x00002aa0 0x00003ff0
@@ -119,6 +122,7 @@ proc _proc_pre_enable_$_CHIPNAME.tpiu {_chipname} {
                          }
                }
        } else {
+               # Set TRACE_IOEN; TRACE_MODE to async
                mmw 0xE0042004 0x00000020 0x000000c0
        }
 }