diff options
| author | Salvador Arroyo <sarroyofdez@yahoo.es> | 2013-02-23 20:00:21 +0100 |
|---|---|---|
| committer | Spencer Oliver <spen@spen-soft.co.uk> | 2013-04-02 15:12:44 +0000 |
| commit | 1d040adb0dd838f4d49b87573ee912d5bc917886 (patch) | |
| tree | 8e44c50d2c18f628a96c9134346d866553063396 | |
| parent | c185a5b72437594a79894dccd7ef8851b5789307 (diff) | |
pic32mx: 0 wait state option
By default pic32mx starts after any reset with 1 wait state for RAM access/exec.
It can be changed to 0 wait states by clearing the BMXWSDRM bit (bit 6) in BMXCON register.
With 0 wait states near doubles the execution speed. CRC check sum can be done much faster
increasing verify_image speed. Fast data transfer also works with a bit higher scan rate, up to 1500 Khz.
This option can be set at any time with
mww 0xbf882004 0x40
or cleared with
mww 0xbf882008 0x40.
Some numbers for FTDI/HS with current devel code and a elf file:
Core clock / wait states verify_image speed
------------------------------------|------------------------------
4 Mhz / 1 21 KiB/s
4 Mhz / 0 36 KiB/s
8 Mhz / 1 37 KiB/s
8 Mhz / 0 57 KiB/s
Change-Id: I4092ad0f3753f72f77108718d0ed3a3ab84e3b23
Signed-off-by: Salvador Arroyo <sarroyofdez@yahoo.es>
Reviewed-on: http://openocd.zylin.com/1141
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
Reviewed-by: Xiaofan <xiaofanc@gmail.com>
| -rw-r--r-- | tcl/target/pic32mx.cfg | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/tcl/target/pic32mx.cfg b/tcl/target/pic32mx.cfg index 8a8eea0e..d53b99a5 100644 --- a/tcl/target/pic32mx.cfg +++ b/tcl/target/pic32mx.cfg @@ -50,12 +50,11 @@ $_TARGETNAME configure -event reset-init { # from reset the pic32 cannot execute code in ram - enable ram execution # minimum offset from start of ram is 2k # - global _PIC32MX_DATASIZE global _WORKAREASIZE - # BMXCON - mww 0xbf882000 0x001f0040 + # BMXCON set 0 wait state option by clearing BMXWSDRM bit, bit 6 + mww 0xbf882000 0x001f0000 # BMXDKPBA: 2k kernel data @ 0xa0000000 mww 0xbf882010 $_PIC32MX_DATASIZE # BMXDUDBA: 14k kernel program @ 0xa0000800 - (BMXDUDBA - BMXDKPBA) |