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boards/arm/ra8m1/ek-ra8m1: Add SCI0 pins and a serial-test config

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board.h gains GPIO_SCI0_RX/TX (P610/P609, SCI0 pin group 3), needed to
exercise CONFIG_RA_SCI0_UART on this board at all -- previously only
SCI9's console pins existed.

The new serial-test defconfig builds on nsh with SCI0 enabled as
/dev/ttyS1 with its FIFO (CONFIG_RA_SCI0_FIFO, measured on hardware as
the best overrun-resistant setting: TTRG=15, RXTRG=0), 1024-byte RX/TX
ring buffers (up from the 256-byte default, to better absorb bursts
during testing), CONFIG_SERIAL_TERMIOS + apps/system/stty (to change
its baud rate live), and apps/examples/serialblaster + serialrx
pointed at it, for exercising the SCI_B driver's FIFO/overrun-recovery
paths independently of the SCI9 console.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Assisted-by: Claude:claude-sonnet-5
Signed-off-by: leocafonso <leocafonso@gmail.com>
This commit is contained in:
leocafonso 2026-10-05 10:55:10 -07:00 • committed by Alan C. Assis
parent 5c3c2cbf0a
commit 6a9f10327f
2 changed files with 56 additions and 0 deletions
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53
boards/arm/ra8m1/ek-ra8m1/configs/serial-test/defconfig Normal file
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@ -0,0 +1,53 @@
#
# This file is autogenerated: PLEASE DO NOT EDIT IT.
#
# You can use "make menuconfig" to make any modifications to the installed .config file.
# You can then do "make savedefconfig" to generate a new defconfig file that includes your
# modifications.
#
CONFIG_ARCH="arm"
CONFIG_ARCH_BOARD="ek-ra8m1"
CONFIG_ARCH_BOARD_EK_RA8M1=y
CONFIG_ARCH_CHIP="ra8m1"
CONFIG_ARCH_CHIP_R7FA8M1AHECBD=y
CONFIG_ARCH_CHIP_RA8M1=y
CONFIG_ARCH_STACKDUMP=y
CONFIG_BOARD_LOOPSPERMSEC=43103
CONFIG_BUILTIN=y
CONFIG_EXAMPLES_SERIALBLASTER=y
CONFIG_EXAMPLES_SERIALBLASTER_DEVPATH="/dev/ttyS1"
CONFIG_EXAMPLES_SERIALRX=y
CONFIG_EXAMPLES_SERIALRX_DEVPATH="/dev/ttyS1"
CONFIG_EXAMPLES_SERIALRX_PRINTSTR=y
CONFIG_FS_PROCFS=y
CONFIG_HAVE_CXX=y
CONFIG_HAVE_CXXINITIALIZE=y
CONFIG_INIT_ENTRYPOINT="nsh_main"
CONFIG_INTELHEX_BINARY=y
CONFIG_NSH_BUILTIN_APPS=y
CONFIG_NSH_DISABLE_IFUPDOWN=y
CONFIG_NSH_FILEIOSIZE=512
CONFIG_NSH_READLINE=y
CONFIG_PREALLOC_TIMERS=4
CONFIG_RAM_SIZE=917504
CONFIG_RAM_START=0x22000000
CONFIG_RA_SCI0_FIFO=y
CONFIG_RA_SCI0_FIFO_RXTRG=0
CONFIG_RA_SCI0_FIFO_TXTRG=15
CONFIG_RA_SCI0_UART=y
CONFIG_RA_SCI9_UART=y
CONFIG_RR_INTERVAL=200
CONFIG_SCHED_WAITPID=y
CONFIG_SCI0_RXBUFSIZE=1024
CONFIG_SCI0_TXBUFSIZE=1024
CONFIG_SCI9_SERIAL_CONSOLE=y
CONFIG_SERIAL_TERMIOS=y
CONFIG_START_DAY=28
CONFIG_START_MONTH=6
CONFIG_START_YEAR=2013
CONFIG_SYSTEM_NSH=y
CONFIG_SYSTEM_STTY=y
CONFIG_TASK_NAME_SIZE=32
CONFIG_TESTING_OSTEST=y
CONFIG_TESTING_OSTEST_NBARRIER_THREADS=3
CONFIG_TESTING_OSTEST_STACKSIZE=2048

3
boards/arm/ra8m1/ek-ra8m1/include/board.h
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@ -321,6 +321,9 @@
#define GPIO_SCI9_RX GPIO_RXD9_MISO9_SCL9_3 /* PA15 */
#define GPIO_SCI9_TX GPIO_TXD9_MOSI9_SDA9_3 /* PA14 */
#define GPIO_SCI0_RX GPIO_RXD0_MISO0_SCL0_3 /* P610 */
#define GPIO_SCI0_TX GPIO_TXD0_MOSI0_SDA0_3 /* P609 */
/* Arduino shield header pin selections *************************************/
/* D2-D5 are wired as inputs, D6-D13 as outputs (see