RTOS 设计说明

RTOS 源码说明

表 1. RTOS 源码说明
相关模块	源码路径
mtd blk	kernel/rt-thread/components/drivers/mtd/mtd_nand.c //mtd 设备通用平台 bsp/artinchip/drv/spinand/spinand_port.c //mtd 设备通用平台对接 bsp/artinchip/drv/spinand/spinand_block.c //blk 设备接口实现
spinand	bsp/peripheral/spinand/
qspi	bsp/artinchip/drv/qspi/drv_qspi.c

RTOS 层次关系

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

RTOS 关键流程

SPI NAND 初始化流程

rt_hw_spinand_register //bsp/artinchip/drv/spinand/spinand_port.c
|-> aic_qspi_bus_attach_device("qspi0", "spinand0", 0, 4, RT_NULL, RT_NULL); //创建 qspi 总线
|-> rt_hw_mtd_spinand_register("spinand0");
    |-> rt_hw_mtd_spinand_init(spinand);
        |-> spinand_flash_init(flash);    //bsp/peripheral/spinand/spinand.c
            |-> spinand_info_read(flash);
            |-> nand_bbt_init(flash);
        |-> mtd_parts_parse(IMAGE_CFG_JSON_PARTS_MTD);
        |-> rt_mtd_nand_register_device(p->name, &g_mtd_partitions[i]); //注册 mtd 设备
        |-> rt_blk_nand_register_device(p->name, &g_mtd_partitions[i]); //注册 block 设备

读数据流程

mtd_read //kernel/rt-thread/components/drivers/mtd/mtd_nand.c
|-> spinand_mtd_read(device ...) //bsp/artinchip/drv/spinand/spinand_port.c
    |-> spinand_read(flash, data, start, dolen); //bsp/peripheral/spinand/spinand.c
        |-> spinand_block_isbad(flash, blk);
        |-> spinand_read_page(flash, page, p, flash->info->page_size, NULL, 0);
            |-> spinand_load_page_op(flash, page);
            |-> spinand_read_from_cache_op(flash, column, buf, nbytes);

blk 设备读数据流程

rt_spinand_read //bsp/artinchip/drv/spinand/spinand_block.c
|-> spinand_mtd_read(device ...) //bsp/artinchip/drv/spinand/spinand_port.c
    |-> spinand_read(flash, data, start, dolen); //bsp/peripheral/spinand/spinand.c
        |-> spinand_block_isbad(flash, blk);
        |-> spinand_read_page(flash, page, p, flash->info->page_size, NULL, 0);
            |-> spinand_load_page_op(flash, page);
            |-> spinand_read_from_cache_op(flash, column, buf, nbytes);