diff options
Diffstat (limited to 'nuttx/configs/nucleo-f401re/README.txt')
| -rw-r--r-- | nuttx/configs/nucleo-f401re/README.txt | 31 |
1 files changed, 28 insertions, 3 deletions
diff --git a/nuttx/configs/nucleo-f401re/README.txt b/nuttx/configs/nucleo-f401re/README.txt index b3a94a43b..868c12358 100644 --- a/nuttx/configs/nucleo-f401re/README.txt +++ b/nuttx/configs/nucleo-f401re/README.txt @@ -31,6 +31,7 @@ Contents - LED - Button - USARTS and Serial Consoles + - Buttons and LEDs - LQFP64 - DFU and JTAG - Configurations @@ -342,14 +343,38 @@ DFU and JTAG Hardware ======== -Buttons and LEDs -================ - Buttons ------- LEDs ---- + The Nucleo F401RE and a single user LED, LD2. LD2 is the green LED + connected to Arduino signal D13 corresponding to MCU I/O PA5 (pin 21) or + PB13 (pin 34) depending on the STM32target. + + - When the I/O is HIGH value, the LED is on. + - When the I/O is LOW, the LED is off. + + These LEDs are not used by the board port unless CONFIG_ARCH_LEDS is + defined. In that case, the usage by the board port is defined in + include/board.h and src/sam_leds.c. The LEDs are used to encode OS-related + events as follows when the red LED (PE24) is available: + + SYMBOL Meaning LD2 + ------------------- ----------------------- ----------- + LED_STARTED NuttX has been started OFF + LED_HEAPALLOCATE Heap has been allocated OFF + LED_IRQSENABLED Interrupts enabled OFF + LED_STACKCREATED Idle stack created ON + LED_INIRQ In an interrupt No change + LED_SIGNAL In a signal handler No change + LED_ASSERTION An assertion failed No change + LED_PANIC The system has crashed Blinking + LED_IDLE MCU is is sleep mode Not used + + Thus if LD2, NuttX has successfully booted and is, apparently, running + normally. If LD2 is flashing at approximately 2Hz, then a fatal error + has been detected and the system has halted. Serial Consoles =============== |