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README
======
This README file discusses the port of NuttX to the Olimex EFM32G880F128-STK
development board. This board features:
• EFM32G880F128
- 32 bit Cortex-M3™
- 128KiB Program Flash, 16KiB Bytes RAM
- 85 GPIO, 8 Channel DMA
- 12 bit ADC 1Msps
- 3xUART/SPI, 2x low power UART
- I2C
- 3x 16bit TIMERS
- 3x2 CC-PWM
- SSC
- RTC
- WDT
- Up to 32MHz operation
• 32.768 kHz crystal
• 32 MHz crystal
• LCD custom display
• DEBUG connector with ARM 2x10 pin layout for programming/debugging
with ARM-JTAG-EW
• UEXT connector
• EXT extension connector
• RS232 connector and driver
• Power jack
• Lithium coin battery holder
• RESET circuit , RESET button
• Four user buttons
• Buzzer
• On-board voltage regulator 3.3V with up to 800mA current
• Power supply filtering capacitor
• Extension headers for some of the uC ports + RST and power supply
STATUS
======
I created this configuration with good intentions but was stopped because
I do not have a SWD tool that I can use with the board -- and I am not
likely to get one soon.
LEDs
====
The EFM32G880F128-STK has no user controllable LEDs.
Buttons
=======
The Olimex board has four buttons, BUT1-4. Each is grounded and so should
have a weak pull-up so that it will be sensed as "1" when open and "0"
when closed.
--------------------- ---------------------
PIN CONNECTIONS
--------------------- ---------------------
PE0/PCNT0_S0IN/U0_TX BUT1, EXT-18
PE1/PCNT0_S1IN/U0_RX BUT2, EXT-19
PE2/ACMP0_O BUT3, EXT-20
E3/ACMP1_O BUT4, EXT-21
--------------------- ---------------------
Serial Console
==============
Pin Availability
----------------
The EFM32G890F128 support the following options for serial output. NOTE
(1) that not all of these pins are available for use as a serial console,
however. And (2) not all pins made available by the board.
EFM32 PIN GPIO NOTES/CONFLICTS/AVAILABILITY
------- -- ---- ----------------------------------------------
US0_RX #0 PE11 SEG7 (LCD)
US0_RX #1 PE6 COM2 (LCD)
US0_RX #2 PC10 **AVAILABLE at EXT-12**
US0_TX #0 PE10 SEG6 (LCD)
US0_TX #1 PE7 COM3 (LCD)
US0_TX #2 PC11 **AVAILABLE at EXT-13**
------- -- ----
US1_RX #0 PC1 **AVAILABLE at EXT-5**
US1_RX #1 PD1 MISO1, Available at UEXT-7
US1_TX #0 PC0 **AVAILABLE at EXT-4**
US1_TX #1 PD0 MOSI1, Available at UEXT-8
------- -- ----
US2_RX #0 PC3 **AVAILABLE at EXT-7**
US2_RX #1 PB4 SEG21 (LCD)
US2_TX #0 PC2 **AVAILABLE at EXT-6**
US2_TX #1 PB3 SEG20 (LCD)
------- -- ----
U0_RX #0 PF7 SEG25 (LCD)
U0_RX #1 PE1 **AVAILABLE at EXT-19**
U0_RX #2 PA4 SEG18 (LCD)
U0_RX #3 PC15 DBG_SWV
U0_TX #0 PF6 SEG24 (LCD)
U0_TX #1 PE0 **AVAILABLE at EXT-18**
U0_TX #2 PA3 SEG17 (LCD)
U0_TX #3 PC14 **AVAILABLE at EXT-16**
------- -- ----
LEU0_RX #0 PD5 LEU0_RX, Available at UEXT-4
LEU0_RX #1 PB14 HFXTAL_N
LEU0_RX #2 PE15 SEG11 (LCD)
LEU0_TX #0 PD4 LEU0_TX, Available at UEXT-3
LEU0_TX #1 PB13 HFXTAL_P
LEU0_TX #2 PE14 SEG10 (LCD)
------- -- ----
LEU1_RX #0 PC7 LEU1_RX to DB-9 connector
LEU1_RX #1 PA6 SEG19 (LCD)
LEU1_TX #0 PC6 LEU1_TX to DB-9 connector
LEU1_TX #1 PA5 SEG18 (LCD)
------- -- ----
RS-232 Driver/DB-9 Connector
----------------------------
LEUART1 is available on through an RS232 driver on DB-9 connector.
Unfortunately, there is no LEUART serial driver available in NuttX as of
this writing.
Default Serial Console
----------------------
LEUART1 is configured as the default serial console at 2400 8N1
on pins PC6 and PC7.
Configurations
==============
Each EFM32G880F128-STK configuration is maintained in a sub-director
and can be selected as follow:
tools/configure.sh olimex-efm32g880f128-stk:<subdir>
Where <subdir> is one of the following:
nsh:
---
Configures the NuttShell (nsh) located at apps/examples/nsh. The
Configuration enables the serial interfaces on LEUART1. Support for
builtin applications is enabled, but in the base configuration no
builtin applications are selected (see NOTES below).
NOTES:
1. This configuration uses the mconf-based configuration tool. To
change this configuration using that tool, you should:
a. Build and install the kconfig-mconf tool. See nuttx/README.txt
see additional README.txt files in the NuttX tools repository.
b. Execute 'make menuconfig' in nuttx/ in order to start the
reconfiguration process.
2. By default, this configuration uses the ARM EABI toolchain
for Windows and builds under Cygwin (or probably MSYS). That
can easily be reconfigured, of course.
CONFIG_HOST_WINDOWS=y : Builds under Windows
CONFIG_WINDOWS_CYGWIN=y : Using Cygwin
CONFIG_ARM_TOOLCHAIN_GNU_EABI=y : GNU EABI toolchain for Windows