BCM2708: Add enough infrastructrue (more stubs) to get a clean compilation of the Pi Zero configuration (with many undefined things at link time).
BCM2708: Add basic interrupt handling logic
BCM2708: Add interrupt register definitions.
BCM2708: Add irq.h header file
BCM2708/Pi zero: bcm_boot.c and bcm_memorymap.h now compile. Added pizero linker script.
BCM2708/Pi Zero: Add Make.defs needed to build.
arch/arm/include/bcm2708, arch/arm/src/bcm2708, configs/pizero: Add some basic build and configuration logic.
configs/pizero: Add some basic structure of the Rasperry Pi Zero port.
Created directory configs/pizero. Nothing there now but a README.txt file.
Add initial boot.c and memorymap.c files
Author: Alan Carvalho de Assis <acassis@gmail.com>
Add AUX/UART/SPI registers definition
Author: Alan Carvalho de Assis <acassis@gmail.com>
Pizero GPIO registers
* Initial commit to add GPIO definitions
* Add remaining GPIO registers definition
Alan Carvalho de Assis <acassis@gmail.com>
BCM2708 memory map: Add VBASE defintions; fix VCSDRAM address per Alan; move all virtual address to the bottom of the file to avoid confusion -- top is all physical address; bottom is all veritural address.
Add initial memory map to BCM2708/BCM2835
Alan Carvalho de Assis <acassis@gmail.com>
- sam_gpioread: Now the actual line level from the pin is read back. This is extremely important for Open-Drain Pins, which can be used bidirectionally
- Re-Implemented twi_reset-function and enhanced it so it can be called from inside the driver (see next point)
- Glitch-Filter: Added a configuration option to enable the twi-built-in glitch filter
- Added a "Single Master Mode": In EMC Testing the TWI-Bus got stuck because the TWI-Master detected a Multi-Master access (but there is no second master). With the option "Single Master" we detect these events and automatically trigger a twi_reset. We also do an automatic recovery if a slave got stuck (SDA stays low).
With the above changes I²C-Bus reliability in harsh environments (eg. EMC) is greatly improved.
The small change in the GPIO-Driver was necessary because otherwise you cannot read back the correct line status of Open-Drain Outputs and this is needed by the twi_reset function.
