Commit Graph

9 Commits

Author SHA1 Message Date
Andrew Leech 19ca025b45 stm32/sdram: Fix to use new mpu_config_start/mpu_config_end signature. 2019-10-22 22:02:06 +11:00
Damien George eca4115f66 stm32/sdram: Use MPU helper functions to configure MPU for SDRAM use. 2019-07-03 01:27:33 +10:00
Andrew Leech 1470184bdd stm32/sdram: Update MPU settings to block invalid region, change attrs.
Set the active MPU region to the actual size of SDRAM configured and
invalidate the rest of the memory-mapped region, to prevent errors due to
CPU speculation.  Also update the attributes of the SDRAM region as per ST
recommendations, and change region numbers to avoid conflicts elsewhere in
the codebase (see eth usage).
2019-05-24 15:55:00 +10:00
Andrew Leech 8ed4a28dae stm32/sdram: Increase GPIO speed for SDRAM interface to "very high".
Currently all usages of mp_hal_pin_config_alt_static() set the pin speed to
"high" (50Mhz).  The SDRAM interface typically runs much faster than this
so should be set to the maximum pin speed.

This commit adds mp_hal_pin_config_alt_static_speed() which allows setting
the pin speed along with the other alternate function details.
2019-02-20 16:54:32 +11:00
Damien George 9639e0d26f stm32/sdram: Add support for 32-bit wide data bus and 256MB in MPU cfg. 2018-09-20 11:29:37 +10:00
forester3 e562f99263 stm32/sdram: Allow additional config by a board, and tune MPU settings.
- Allow configuration by a board of autorefresh number and burst length.
- Increase MPU region size to 8MiB.
- Make SDRAM region cacheable and executable.
2018-08-14 16:00:14 +10:00
Andrew Leech 968fa47392 stm32/sdram: On F7 MCUs enable MPU on external SDRAM.
This prevents hard-faults on non-aligned accesses.

Reference: http://www.keil.com/support/docs/3777.htm
2018-07-23 23:15:18 +10:00
Andrew Leech a1db1506a2 stm32/sdram: Integrate SDRAM driver into rest of code.
If SDRAM is configured and enabled for a board then it is used for the
MicroPython GC heap.
2018-07-23 23:14:23 +10:00
Andrew Leech 7ae053abfd stm32/sdram: Add SDRAM driver from OpenMV project.
Taken from 7fbe54ad4e/src/omv/sdram.c

Code is is MIT licensed.
2018-07-23 23:13:24 +10:00