Commit Graph

29 Commits

Author SHA1 Message Date
yn386 e18e47fa81 stm32/i2c: Add hardware I2C implementation for STM32L4.
For STM32L4, hardware I2C can be implemented by using TIMINGR.
This commit enables:
- Use of hardware I2C in machine.I2C.
- Specifying a frequency greater than or equal to 400KHz with pyb.I2C.
2022-11-18 15:01:13 +11:00
yn386 d0bea69c5e stm32/i2c: Add hardware I2C implementation for STM32L1.
For STM32L1, hardware I2C can be implemented the same as STM32F4 for
machine.I2C.

Tested on NUCLEO-L152RE.
2022-11-18 14:48:49 +11:00
yn386 a74e4fabeb stm32/i2c: Fix I2C frequency calc so it doesn't exceed requested rate.
Prior to this commit, the actual I2C frequency can be faster than specified
one and it may exceed the I2C's specification for Fast Mode.  The frequency
of SCL should be less than or equal to 400KHz in Fast Mode.

This commit fixes this issue for F4 MCUs by rounding up the division in the
frequency calculation.
2022-11-18 14:25:19 +11:00
iabdalkader 67d1dca9c2 stm32/machine_i2c: Use hardware I2C for STM32H7. 2021-09-21 18:13:28 +10:00
Damien George 1e4e2644ec stm32: Add support for a board to reserve certain peripherals.
Allows reserving CAN, I2C, SPI, Timer and UART peripherals.  If reserved
the peripheral cannot be accessed from Python.

Signed-off-by: Damien George <damien@micropython.org>
2020-12-07 17:22:08 +11:00
Damien George 4ce6427bd7 stm32/i2c: Factor I2C finding code to i2c_find_peripheral function.
Signed-off-by: Damien George <damien@micropython.org>
2020-12-07 17:21:36 +11:00
Damien George 3eff81288c stm32/i2c: Fix generation of restart condition for hw I2C on F0/F7.
Before this patch I2C transactions using a hardware I2C peripheral on F0/F7
MCUs would not correctly generate the I2C restart condition, and instead
would generate a stop followed by a start.  This is because the CR2 AUTOEND
bit was being set before CR2 START when the peripheral already had the I2C
bus from a previous transaction that did not generate a stop.

As a consequence all combined transactions, eg read-then-write for an I2C
memory transfer, generated a stop condition after the first transaction and
didn't generate a stop at the very end (but still released the bus).  Some
I2C devices require a repeated start to function correctly.

This patch fixes this by making sure the CR2 AUTOEND bit is set after the
start condition and slave address have been fully transferred out.
2019-08-16 13:34:04 +10:00
Andrew Leech ed2b6ea0a8 stm32/i2c: Make timeout for hardware I2C configurable.
Previously the hardware I2C timeout was hard coded to 50ms which isn't
guaranteed to be enough depending on the clock stretching specs of the I2C
device(s) in use.

This patch ensures the hardware I2C implementation honors the existing
timeout argument passed to the machine.I2C constructor.  The default
timeout for software and hardware I2C is now 50ms.
2019-05-21 12:20:19 +10:00
Damien George bc5e8a2cb6 stm32/i2c: Fix num_acks calculation in i2c_write for F0 and F7 MCU's.
Due to buffering of outgoing bytes on the I2C bus, detection of a NACK
using the ISR_NACKF flag needs to account for the case where ISR_NACKF
corresponds to the previous-to-previous byte.
2018-06-15 14:10:53 +10:00
Damien George ea7e747979 stm32: Add support for STM32F0 MCUs. 2018-05-28 21:49:49 +10:00
Damien George b21415ed4f stm32/i2c: Add new hardware I2C driver for F4 MCUs.
This driver uses low-level register access to control the I2C peripheral
(ie it doesn't rely on the ST HAL) and provides the same C-level API as the
existing F7 hardware driver.
2018-05-14 13:19:03 +10:00
Damien George e638defff4 stm32/i2c: Make sure stop condition is sent after receiving addr nack. 2018-05-09 15:53:09 +10:00
Damien George 19778d0a3c stm32/i2c: Add low-level I2C driver for F7 MCUs. 2018-04-24 23:48:04 +10:00
Damien George b73adcc3d9 stm32: Rename i2c.c to pyb_i2c.c.
i2c.c implements the legacy pyb.I2C class so rename the file to make this
explicit, and also to make room for an improved I2C driver.
2018-04-24 16:23:36 +10:00
Damien George 22f1414abb stm32/i2c: Fully support peripheral I2C4. 2018-04-10 14:33:18 +10:00
Damien George 69bf23c9cf stm32/i2c: Update HAL macros to use new __HAL_RCC prefix. 2018-04-10 14:28:39 +10:00
Damien George 2dca693c24 stm32: Change pin_X and pyb_pin_X identifiers to be pointers to objects.
Rather than pin objects themselves.  The actual object is now pin_X_obj and
defines are provided so that pin_X is &pin_X_obj.  This makes it so that
code that uses pin objects doesn't need to know if they are literals or
objects (that need pointers taken) or something else.  They are just
entities that can be passed to the map_hal_pin_xxx functions.  This mirrors
how the core handles constant objects (eg mp_const_none which is
&mp_const_none_obj) and allows for the possibility of different
implementations of the pin layer.

For example, prior to this patch there was the following:

    extern const pin_obj_t pin_A0;
    #define pyb_pin_X1 pin_A0
    ...
    mp_hal_pin_high(&pin_A0);

and now there is:

    extern const pin_obj_t pin_A0_obj;
    #define pin_A0 (&pin_A0_obj)
    #define pyb_pin_X1 pin_A0
    ...
    mp_hal_pin_high(pin_A0);

This patch should have minimal effect on board configuration files.  The
only change that may be needed is if a board has .c files that configure
pins.
2018-03-28 16:29:50 +11:00
Damien George 6b51eb22c8 stm32: Consolidate include of genhdr/pins.h to single location in pin.h.
genhdr/pins.h is an internal header file that defines all of the pin
objects and it's cleaner to have pin.h include it (where the struct's for
these objects are defined) rather than an explicit include by every user.
2018-03-27 20:25:24 +11:00
iabdalkader 24a9facd89 stm32/i2c: Add H7 I2C timing configurations.
Found the timing for full (400 KHz) and FM+ (1MHz) in the HAL examples, and
used CubeMX to calculate the standard value (100KHz).
2018-03-20 23:25:01 +11:00
Damien George e37b8ba5a5 stm32: Use STM32xx macros instead of MCU_SERIES_xx to select MCU type.
The CMSIS files for the STM32 range provide macros to distinguish between
the different MCU series: STM32F4, STM32F7, STM32H7, STM32L4, etc.  Prefer
to use these instead of custom ones.
2018-03-17 10:42:50 +11:00
Damien George 024edafea0 stm32/i2c: On F4 MCUs report the actual I2C SCL frequency. 2018-03-07 14:59:03 +11:00
Damien George 4b8e58756b stm32/i2c: Allow I2C peripheral state to persist across a soft reset.
The I2C sub-system is independent from the uPy state (eg the heap) and so
can safely persist across a soft reset.
2018-02-02 19:04:36 +11:00
liamkinne 618aaa4a53 stm32/i2c: Use macros instead of magic numbers for I2C speed grades. 2018-02-02 12:15:05 +11:00
Damien George b806889512 stm32/i2c: Support more I2C baudrates for F746, and more F7 MCUs. 2017-12-23 19:24:24 +11:00
Damien George 008e1788e8 stm32/i2c: Fix bug with I2C4 initialisation. 2017-12-23 19:22:52 +11:00
Damien George c73360bfdb stm32: Allow to build a board without any hardware I2C ports defined.
This patch adds in internal config value MICROPY_HW_ENABLE_HW_I2C that is
automatically configured, and enabled only if one or more hardware I2C
ports are defined in the mpconfigboard.h file.  If none are defined then
the pyb.I2C class is excluded from the build, along with all supporting
code.  The machine.I2C class will still be available for software I2C.

Disabling all hardware I2C on an F4 board saves around 10,000 bytes of code
and 200 bytes of RAM.
2017-12-22 15:20:42 +11:00
Damien George a3dc1b1957 all: Remove inclusion of internal py header files.
Header files that are considered internal to the py core and should not
normally be included directly are:
    py/nlr.h - internal nlr configuration and declarations
    py/bc0.h - contains bytecode macro definitions
    py/runtime0.h - contains basic runtime enums

Instead, the top-level header files to include are one of:
    py/obj.h - includes runtime0.h and defines everything to use the
        mp_obj_t type
    py/runtime.h - includes mpstate.h and hence nlr.h, obj.h, runtime0.h,
        and defines everything to use the general runtime support functions

Additional, specific headers (eg py/objlist.h) can be included if needed.
2017-10-04 12:37:50 +11:00
Damien George 19f1b39d6f stm32/i2c: When scanning for I2C devices only do 1 probe per address.
Previous to this patch the i2c.scan() method would do up to 100 probes per
I2C address, to detect the devices on the bus.  This repeated probing was a
relic from when the code was copied from the accelerometer initialisation,
which requires to do repeated probes while waiting for the accelerometer
chip to turn on.

But I2C devices shouldn't need more than 1 probe to detect their presence,
and the generic software I2C implementation uses 1 probe successfully.  So
this patch changes the implementation to use 1 probe per address, which
significantly speeds up the scan operation.
2017-09-08 11:19:40 +10:00
Damien George 01dd7804b8 ports: Make new ports/ sub-directory and move all ports there.
This is to keep the top-level directory clean, to make it clear what is
core and what is a port, and to allow the repository to grow with new ports
in a sustainable way.
2017-09-06 13:40:51 +10:00