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risc-v/gd32vw55x: add sdcard (SPI/FAT) example to gd32vw553k-start
Add an "sdcard" configuration that mounts an SD card over SPI0 with a FAT filesystem. The board provides the SPI chip-select glue (gd32_spi0select, gd32_spi0status and gd32_spi0register in a new gd32_spi.c) and gd32_bringup() binds the slot with mmcsd_spislotinitialize() and mounts /dev/mmcsd0 on /mnt/sd. The card is wired to the J1 header: SCK PA2, MISO PA1, MOSI PA0, and a software chip select on PA4. CONFIG_MMCSD_MMCSUPPORT is left off (its MMC CMD1 probe upsets SD cards). Signed-off-by: Jorge Guzman <jorge.gzm@gmail.com>
This commit is contained in:
Jorge Guzman
CeDeROM
parent
e33a1f9943
commit
bbc0bdd40c
7 changed files with 273 additions and 5 deletions
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@ -256,6 +256,50 @@ duty (100 Hz, 50 % by default)::
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duration for a single run. Put an LED (with a series resistor) or a scope on
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PA0 to see it.
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sdcard
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------
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NSH plus an SD card on SPI0 with a FAT filesystem. The card is registered as
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``/dev/mmcsd0`` and ``gd32_bringup()`` mounts it on ``/mnt/sd``.
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Wire the card (or a microSD-over-SPI breakout) to the J1 header:
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======== ==========
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Signal Pin
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======== ==========
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SCK PA2
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MISO PA1
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MOSI PA0
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CS PA4
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======== ==========
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.. note::
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Power the breakout from **5 V**, not 3.3 V. These breakouts carry their
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own 3.3 V regulator, and the SD card draws current bursts while it powers
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up; feeding 3.3 V directly leaves the card stuck in the ACMD41 init loop
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(it answers CMD0/CMD8 but never leaves the idle state). A decoupling
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capacitor close to the card and short leads help too.
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The SPI runs its initialisation at ~625 kHz (PCLK2 / 256), slightly above the
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400 kHz of the SD spec, which the vast majority of cards tolerate.
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The block device shows up as ``/dev/mmcsd0`` and the bringup already mounts it
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on ``/mnt/sd``, so no manual ``mount`` is needed::
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nsh> ls /dev/
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/dev:
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console
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mmcsd0
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null
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ttyS0
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zero
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nsh> mount
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/mnt/sd type vfat
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nsh> echo "GD32 on NuttX" > /mnt/sd/hello.txt
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nsh> cat /mnt/sd/hello.txt
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GD32 on NuttX
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nsh> ls -l /mnt/sd
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littlefs
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--------
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@ -0,0 +1,55 @@
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#
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# This file is autogenerated: PLEASE DO NOT EDIT IT.
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#
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# You can use "make menuconfig" to make any modifications to the installed .config file.
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# You can then do "make savedefconfig" to generate a new defconfig file that includes your
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# modifications.
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#
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# CONFIG_ARCH_LEDS is not set
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# CONFIG_MMCSD_MMCSUPPORT is not set
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CONFIG_ARCH="risc-v"
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CONFIG_ARCH_BOARD="gd32vw553k-start"
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CONFIG_ARCH_BOARD_GD32VW553K_START=y
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CONFIG_ARCH_CHIP="gd32vw55x"
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CONFIG_ARCH_CHIP_GD32VW553KM=y
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CONFIG_ARCH_CHIP_GD32VW55X=y
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CONFIG_ARCH_INTERRUPTSTACK=2048
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CONFIG_ARCH_RISCV=y
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CONFIG_ARCH_STACKDUMP=y
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CONFIG_BOARDCTL_RESET=y
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CONFIG_BOARD_LOOPSPERMSEC=16000
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CONFIG_BUILTIN=y
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CONFIG_DEBUG_FEATURES=y
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CONFIG_DEBUG_FULLOPT=y
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CONFIG_DEBUG_SYMBOLS=y
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CONFIG_EXAMPLES_HELLO=y
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CONFIG_FS_FAT=y
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CONFIG_FS_PROCFS=y
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CONFIG_GD32VW55X_SPI=y
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CONFIG_GD32VW55X_UART2=y
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CONFIG_IDLETHREAD_STACKSIZE=2048
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CONFIG_INIT_ENTRYPOINT="nsh_main"
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CONFIG_INIT_STACKSIZE=3072
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CONFIG_INTELHEX_BINARY=y
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CONFIG_LIBC_PERROR_STDOUT=y
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CONFIG_LIBC_STRERROR=y
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CONFIG_MMCSD=y
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CONFIG_NFILE_DESCRIPTORS_PER_BLOCK=6
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CONFIG_NSH_BUILTIN_APPS=y
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CONFIG_NSH_FILEIOSIZE=64
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CONFIG_NSH_READLINE=y
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CONFIG_NSH_STRERROR=y
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CONFIG_RAM_SIZE=294400
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CONFIG_RAM_START=0x20000200
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CONFIG_RAW_BINARY=y
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CONFIG_RR_INTERVAL=200
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CONFIG_SCHED_WAITPID=y
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CONFIG_STACK_COLORATION=y
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CONFIG_START_DAY=13
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CONFIG_START_MONTH=7
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CONFIG_START_YEAR=2026
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CONFIG_SYSTEM_NSH=y
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CONFIG_TASK_NAME_SIZE=12
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CONFIG_UART2_RXBUFSIZE=128
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CONFIG_UART2_SERIAL_CONSOLE=y
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CONFIG_UART2_TXBUFSIZE=128
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@ -71,6 +71,15 @@
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# define GPIO_SPI_SCK GPIO_SPI_SCK_1 /* PA2, AF5 */
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# define GPIO_SPI_MISO GPIO_SPI_MISO_1 /* PA1, AF5 */
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# define GPIO_SPI_MOSI GPIO_SPI_MOSI_1 /* PA0, AF5 */
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/* SPI0 chip select for the SD card: a plain GPIO output on PA4 (J1),
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* driven by gd32_spi0select(). Active low, idles high.
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*/
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# define GPIO_SPI0_CSPIN (GPIO_CFG_MODE_OUTPUT | GPIO_CFG_PUPD_NONE | \
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GPIO_CFG_PP | GPIO_CFG_SPEED_MAX | \
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GPIO_CFG_OUTPUT_SET | GPIO_CFG_PORT_A | \
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GPIO_CFG_PIN_4)
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#endif
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/* I2C0 uses PA2 (SCL) / PA3 (SDA) on AF4, the pins broken out on the J1
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@ -38,4 +38,8 @@ ifeq ($(CONFIG_BOARDCTL_RESET),y)
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CSRCS += gd32_reset.c
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endif
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ifeq ($(CONFIG_GD32VW55X_SPI),y)
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CSRCS += gd32_spi.c
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endif
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include $(TOPDIR)/boards/Board.mk
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@ -37,6 +37,9 @@
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#ifdef CONFIG_SPI_DRIVER
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# include <nuttx/spi/spi_transfer.h>
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#endif
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#ifdef CONFIG_MMCSD_SPI
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# include <nuttx/mmcsd.h>
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#endif
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#ifdef CONFIG_GD32VW55X_ADC
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# include <nuttx/analog/adc.h>
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#endif
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@ -171,19 +174,47 @@ int gd32_bringup(void)
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#endif
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#ifdef CONFIG_GD32VW55X_SPI
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/* The family has a single SPI instance: bus 0 */
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/* The family has a single SPI instance: bus 0. Configure the chip select
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* GPIOs first, then bring the bus up.
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*/
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gd32_spidev_initialize();
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spi = gd32_spibus_initialize(0);
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if (spi == NULL)
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{
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ferr("ERROR: failed to initialize SPI0\n");
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}
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#ifdef CONFIG_SPI_DRIVER
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else if (spi_register(spi, 0) < 0)
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else
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{
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ferr("ERROR: failed to register /dev/spi0\n");
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}
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#ifdef CONFIG_SPI_DRIVER
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if (spi_register(spi, 0) < 0)
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{
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ferr("ERROR: failed to register /dev/spi0\n");
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}
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#endif
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#ifdef CONFIG_MMCSD_SPI
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/* Bind SPI0 to the MMC/SD SPI slot (/dev/mmcsd0) and mount it as FAT.
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* The SD card is wired to SPI0 (SCK PA2, MISO PA1, MOSI PA0) with the
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* chip select on PA4 -- all on the J1 header.
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*/
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ret = mmcsd_spislotinitialize(0, 0, spi);
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if (ret < 0)
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{
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ferr("ERROR: failed to bind SPI0 to the MMC/SD slot: %d\n", ret);
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}
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else
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{
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ret = nx_mount("/dev/mmcsd0", "/mnt/sd", "vfat", 0, NULL);
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if (ret < 0)
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{
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ferr("ERROR: failed to mount /mnt/sd: %d\n", ret);
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}
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}
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#endif
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}
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#endif
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#ifdef CONFIG_GD32VW55X_ADC
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113
boards/risc-v/gd32vw55x/gd32vw553k-start/src/gd32_spi.c
Normal file
113
boards/risc-v/gd32vw55x/gd32vw553k-start/src/gd32_spi.c
Normal file
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@ -0,0 +1,113 @@
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/****************************************************************************
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* boards/risc-v/gd32vw55x/gd32vw553k-start/src/gd32_spi.c
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <inttypes.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <debug.h>
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#include <nuttx/spi/spi.h>
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#include <arch/board/board.h>
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#include "gd32vw55x_gpio.h"
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#include "gd32vw553k-start.h"
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#ifdef CONFIG_GD32VW55X_SPI
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: gd32_spidev_initialize
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*
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* Description:
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* Configure the SPI chip select GPIO(s). The bus itself is brought up by
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* gd32_spibus_initialize().
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*
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****************************************************************************/
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void gd32_spidev_initialize(void)
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{
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/* The SD card chip select on SPI0, idle (de-asserted, high) */
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gd32_gpio_config(GPIO_SPI0_CSPIN);
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gd32_gpio_write(GPIO_SPI0_CSPIN, true);
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}
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/****************************************************************************
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* Name: gd32_spi0select and gd32_spi0status
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*
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* Description:
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* The board-specific select and status methods of the SPI interface (see
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* include/nuttx/spi/spi.h). Chip select is active low.
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*
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****************************************************************************/
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void gd32_spi0select(struct spi_dev_s *dev, uint32_t devid, bool selected)
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{
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spiinfo("devid: %" PRIu32 " CS: %s\n", devid,
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selected ? "assert" : "de-assert");
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gd32_gpio_write(GPIO_SPI0_CSPIN, !selected);
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}
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uint8_t gd32_spi0status(struct spi_dev_s *dev, uint32_t devid)
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{
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uint8_t status = 0;
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if (devid == SPIDEV_MMCSD(0))
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{
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/* There is no card-detect line wired, so assume the card is present */
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status |= SPI_STATUS_PRESENT;
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}
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return status;
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}
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#ifdef CONFIG_SPI_CALLBACK
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/****************************************************************************
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* Name: gd32_spi0register
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*
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* Description:
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* Register a media-change callback. This board has no card-detect line,
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* so there is nothing to notify; the slot is reported present by
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* gd32_spi0status().
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*
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****************************************************************************/
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int gd32_spi0register(struct spi_dev_s *dev, spi_mediachange_t callback,
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void *arg)
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{
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return OK;
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}
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#endif
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#endif /* CONFIG_GD32VW55X_SPI */
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@ -37,4 +37,16 @@
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int gd32_bringup(void);
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/****************************************************************************
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* Name: gd32_spidev_initialize
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*
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* Description:
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* Configure the SPI chip select GPIO(s) used by the board.
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*
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****************************************************************************/
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#ifdef CONFIG_GD32VW55X_SPI
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void gd32_spidev_initialize(void);
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#endif
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#endif /* __BOARDS_RISCV_GD32VW55X_GD32VW553K_START_SRC_GD32VW553K_START_H */
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