RTOS 设计说明

源码说明

表 1. 源码说明
相关模块	源码路径
mtd	kernel/rt-thread/components/drivers/mtd/mtd_nor.c
spinand	bsp/peripheral/spinor_sfudbsp/artinchip/drv/spinor/spinor_sfud.c
qspi	bsp/artinchip/drv/qspi/drv_qspi.c

RTOS 层次关系

../images/rtt_spinor.png — 图 1. SPI NOR 驱动框架

mtd 设备用来挂载 Littlefs 文件系统，blk 设备用来挂载 FatFS 文件系统。

RTOS 关键流程

SPI NOR 初始化流程

rt_hw_spi_flash_with_sfud_init //bsp/artinchip/drv/spinor/spinor_sfud.c
|-> aic_qspi_bus_attach_device("qspi0", SPI_FLASH_DEVICE_NAME, 0, 4, RT_NULL, RT_NULL);//创建 qspi 总线
|-> rt_sfud_flash_probe(USING_NOR_FLASH_DEV_NAME,SPI_FLASH_DEVICE_NAME) //kernel/rt-thread/components/drivers/spi/spi_flash_sfud.c
    |-> rt_sfud_flash_probe_ex(spi_flash_dev_name, spi_dev_name, &cfg, RT_NULL);
        |-> rt_qspi_configure(qspi_dev, qspi_cfg);
        |-> sfud_device_init(sfud_dev)
            |-> hardware_init(flash);
            |-> sfud_spi_port_init(flash); ////kernel/rt-thread/components/drivers/spi/spi_flash_sfud.c
            |-> flash->spi.wr = spi_write_read; //提供读写接口
            |-> flash->spi.qspi_read = (void *)qspi_read; //提供快速读取接口
          |-> read_jedec_id(flash); //读取设备 id
          |-> sfud_read_sfdp(flash);  //自动识别 SPI NOR
        |-> sfud_qspi_fast_read_enable(sfud_dev, qspi_dev->config.qspi_dl_width);
        |->  rt_device_register(&(rtt_dev->flash_device), spi_flash_dev_name, RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_STANDALONE);