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0190e45305
Reading of code + datasheet showed that we did enable parity checking but never actually checked if the USART has the PARE bit in CSR set. Let's change that. Plus also avoid possible race conditions due to multiple status resets via US_CR_RSTSTA. Let's only reset that once per interrupt handler. TODO: actually do something useful at that point. We currently don't report those to the host, nor do we attempt to recover in any way. The data sheet also doesn't tell us what it actually does in such situations; it appears the character is *not* returned from the USART, so we're missing one byte in the stream at that point. Change-Id: I5f012d86c61a2377d355396e7b95d078952bee7c Related: OS#5464
This is the source code for SIMtrace 2 firmwares.
= Hardware
== Micro-Controller
The firmware is for Microchip (formerly Atmel) ATSAM3S4B micro-controllers (MCU).
Product page: https://www.microchip.com/wwwproducts/en/ATSAM3S4B
Datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-6500-32-bit-Cortex-M3-Microcontroller-SAM3S4-SAM3S2-SAM3S1_Datasheet.pdf
Note: The SAM3S is now not recommended for new designs.
It can be replaced by the pin-compatible SAM4S.
The MCU can be specified using the environment variable `CHIP` (set to `sam3s4` per default) for future MCU support.
== Boards
The SIMtrace 2 firmware supports multiple boards.
A board defines a given circuit board.
While compiling the firmware, set the target board using the `BOARD` environment variable (set to `qmod` per default).
The supported boards correspond to sub-folders under `libboard`.
Current boards supported are:
* `simtrace`: The good old Osmocom SIMtrace PCB with SAM3 instead of SAM7, open hardware.
* `qmod`: A sysmocom-proprietary quad mPCIe carrier board, publicly available
* `owhw`: An undisclosed sysmocom-internal board, not publicly available
* `octsimtest`: A sysmocom-proprietary production testing board, not publicly available
= Firmware
== Library
The firmware uses the manufacturer provided Software Package (SoftPack) micro-controller library.
The original library is available at https://www.microchip.com/design-centers/32-bit/softpacks/legacy-softpacks .
Version 2.1 from 2001 is used: http://ww1.microchip.com/downloads/en/DeviceDoc/SAM3S_softpack_2.1_for_CodeSourcery_2010q1.zip
The SIMtrace 2 project uses the `libboard_sam3s-ek`, `libchip_sam3s`, and `usb` sub-libraries, saved in `atmel_softpack_libraries` (with local modifications).
Note: SoftPack is the legacy micro-controller library.
This library is now replaced by the Advanced Software Framework (ASF): https://www.microchip.com/avr-support/advanced-software-framework-(asf) .
The SAM3S ASF documentation is available at http://asf.atmel.com/docs/latest/sam3s/html/index.html .
== Applications
An application is a specific piece of software with given functionality.
While compiling the firmware, set the target application using the `APP` environment variable (set to `dfu` per default).
The supported applications correspond to sub-folder under `apps`.
Current applications supported are:
* `dfu`: The USB DFU bootloader to flash further main appliction firmwares.
* `ccid`: To use SIMtrace 2 as USB CCID smartcard reader.
* `cardem`: To provide remote SIM operation capabilities.
* `trace`: To monitor the communication between a SIM card and a phone (corresponds to the functionality provide by the first SIMtrace)
* `triple_play`: To support the three previous functionalities, using USB configurations.
* `gpio_test`: internal test code
== Memories
Firmwares can be run from several memory locations:
* flash: Run natively from start of flash memory
* dfu: Run after a DFU bootloader from an offset after the first 16k of flash (the first 16k are reserved for the bootloader)
* ram: Run from within the RAM of the chip, downloaded via JTAG/SWD
== Building
A given firmware build is made for a specific combination of an application `APP` running in a certain memory `MEM` on a given board `BOARD`.
When building using `make`, set the target application using the `APP` environment variable and target board using the `BOARD` environment variable, e.g.:
* make APP=cardem BOARD=qmod
* make APP=dfu BOARD=qmod
The Makefile will create output files in the format: `bin/$(BOARD)-$(APP)-$(MEM).{elf,bin}`
The level of debug messages can be altered at compile time:
```
$ make TRACE_LEVEL=4
```
Accepted values: 0 (NO_TRACE) to 5 (DEBUG)
The qmod specific option `ALLOW_PEER_ERASE` controls if the UART debug command to assert the peer SAM3S ERASE line is present in the code.
Per default this is set to 0 to prevent accidentally erasing all firmware, including the DFU bootloader, which would then need to be flashed using SAM-BA or JTAG/SWD.
Setting `ALLOW_PEER_ERASE` to 1 enables back the debug command and should be used only for debugging or development purposes.
= Flashing
To flash a firmware image follow the instructions provided in the [wiki](https://projects.osmocom.org/projects/simtrace2/wiki/).