Questions about stm class

[photoacoustic]

Dear all,
I just begin with micropython. For instant, I use STM32F4 discovery board. Thanks a lot to micropython team! This is a very great tool!
I would like to play the stm class in order to get access to the MCU registers.
I see some examples in th micropython doc. But these example use inline assembler.
Is it possible to use this class without inline assembler?
I have try the following lines in REPL without success!
--- my input
GPIOD_BaseAdr=stm.GPIOD
GPIOD_BSRRL_Adr=stm.GPIO_BSRRL+GPIOD_BaseAdr
-- my output
No error but I don't know the effect!

Thanks in advance for comments and suggestions
Best regards

[dhylands]

stm.GPIOD is a numeric constant containing the address of the GPIOD register, stm.GPIO_BSRRL is a numeric constant containing the offset of the BSSRL register within the GPIO peripheral.

To actually modify the register you need to use the stm.mem8, mem16, or mem32 commands.

Something like:

Code: Select all

import stm
stm.mem16(stm.GPIOD + stm.GPIO_BSRRL, 1)

should set D0 and

Code: Select all

import stm
stm.mem16(stm.GPIOD + stm.GPIO_BSRRH, 1)

should clear D0.

[photoacoustic]

Thanks very much!
I will adopt micropython for my courses! Having high level and low level approach is very nice for teaching.
Thanks again.

[Damien]

Actually, you need to use the mem8, mem16 and mem32 functions like an array:

Code: Select all

import stm
stm.mem16[stm.GPIOD + stm.GPIO_BSRRL] = 1 # set D0 high
stm.mem16[stm.GPIOD + stm.GPIO_BSRRH] = 1 # set D0 low
dport = stm.mem32[stm.GPIOD + stm.GPIO_IDR] # read all 16 bits on port D

[dhylands]

Sigh - My bad for not testing my suggestion