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6 Commits

Author SHA1 Message Date
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