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bsps/raspberrypi: Change firmware version, add SPI & I2C support

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pranav 2021-08-16 15:57:53 +05:30 committed by Joel Sherrill
parent efb8e7c6c3
commit bd4dedc192
1 changed files with 45 additions and 6 deletions
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51
user/bsps/arm/raspberrypi.rst
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@ -5,8 +5,9 @@
raspberrypi
===========
This BSP supports `Raspberry Pi 1` and `Raspberry Pi 2` currently.
The support for `Raspberry Pi 3` is work under progress.
The 'raspberrypi' BSP supports the single core models (Zero, Zero W, A+, B+),
and the 'raspberrypi2' BSP supports the Raspberry Pi 2, Raspberry Pi 3 A+, and Raspberry Pi 3.
The Raspberry Pi 4 is not supported currently.
The default bootloader on the Raspberry Pi which is used to boot Raspbian
or other OS can be also used to boot RTEMS. U-boot can also be used.
@ -19,10 +20,12 @@ The bootloader looks for a kernel image, by default the kernel images must
have a name of the form ``kernel*.img`` but this can be changed by adding
`kernel=<img_name>` to ``config.txt``.
You must provide the required files for the GPU to proceed. These files
You must provide the required firmware files on the SD card for the GPU to proceed,
and thereby to boot RTEMS.
The BSP currently boots up with an older version of the official firmware. These files
can be downloaded from
`the Raspberry Pi Firmware Repository <https://github.com/raspberrypi/firmware/tree/master/boot>`_.
You can remove the ``kernel*.img`` files if you want too, but don't touch
`the Raspberry Pi Firmware Repository <https://github.com/raspberrypi/firmware/tree/1.20200601/boot>`_.
You can remove the ``kernel*.img`` files if you want to, but don't touch
the other files.
Copy these files in to a SD card with FAT filesystem.
@ -46,10 +49,46 @@ Make sure you have these lines below, in your ``config.txt``.
.. code-block:: none
enable_uart=1
dtoverlay=disable-bt
kernel_address=0x200000
kernel=kernel.img
SPI Driver
------------
SPI drivers are registered by the ``rpi_spi_init(bool bidirectional_mode)`` function.
.. code-block:: none
#include <assert.h>
#include <bsp.h>
void spi_init(void)
{
int rv;
rv = rpi_spi_init(false);
assert(rv == 0);
}
I2C Driver
------------
I2C drivers are registered by the ``rpi_setup_i2c_bus()`` function.
.. code-block:: none
#include <assert.h>
#include <bsp.h>
void i2c_init(void)
{
int rv;
rv = rpi_setup_i2c_bus();
assert(rv == 0);
}
Testing using QEMU
------------------