U盘读写汇编程序PB375

lanxunlanya 2009-3-21 17:51 楼主

PB375 U盘读写汇编程序性价比超高的U盘读写模块-PB375，兼容CH375读写操作
1．功能
● 用于嵌入式系统/单片机读写U 盘、闪盘、闪存盘、USB 移动硬盘、USB 读卡器等。
● 支持符合USB 相关规范基于Bulk-Only 传输协议的各种U 盘/闪存盘/外置硬盘。
● 支持文件系统FAT12 和FAT16 及FAT32
● 文件操作功能：新建、删除、读写数据，打开关闭文件等。
● SPI接口，支持3.3V电平
● 兼容CH375模块的操作命令
● 单芯片解决方案，该模块只需要一个主控芯片外加少量的电容电阻便可，相对于51MCU+SL811/CH375的模块，无论模块尺寸还是成本都有着极大的优势。
● 可以是模块提供，也可以是芯片提供（只需要简单的几个外围元件就可以了）
具体参数可以下载数据手册或者联系销售人员
基本不需要占用单片机系统的存储空间，最少只需要几个字节的RAM 和几百字节的代码。
下面就是一个很通用的台湾的单片机（可以是holtek 松翰义隆富晶等）用汇编操作PB375实现读写操作U盘的代码：
USB_FAIL       EQU       0AAH
USB_SUCC       EQU       055H
TRY_TIMES       EQU       0FFH
CMD_DiskReady EQU       071H
CMD_FileCreate EQU       065H
CMD_ByteWrite       equ       07Ch
CMD_FileClose       equ       067h
//设置SPI  端口的输入输出
spi_ini:
nop
call i2c_delay
b0bset spi_sdo_mod
b0bset spi_sck_mod
b0bset spi_cs_mod
b0bclr spi_sdi_mod
b0bset  spi_cs             ;not chose
b0bset spi_sck
b0bclr spi_sdo
b0bclr spi_sdi
ret
/************************
SPI发一个字节，同时读一个字节
*************************/
spi_send:
nop
clr epr_num
clr spi_in
b0bclr spi_sck
spi_write_bit:
b0bts0 epr_data_b
jmp spi_write_h
b0bclr spi_sdo
jmp spi_read_com
spi_write_h:
b0bset spi_sdo
spi_read_com:
call i2c_delay
b0bclr fc
rlcm       spi_in
b0bts0 spi_sdi
incms       spi_in
b0bclr fc
b0bset spi_sck
call i2c_delay
b0bclr spi_sck       ;sck=0,data variable
call i2c_delay
rlcm epr_data ;prepare for next
incms epr_num
nop
b0bts1 epr_num_b
jmp spi_write_bit
call i2c_delay
ret
//发送命令
spi_send_command:
b0bclr spi_cs
b0mov       rbank,#1       ; 写入命令码
mov          a,cmd
b0mov       rbank,#0
b0mov       epr_data,a
call       spi_send
b0mov       rbank,#1       ;写入后续参数的长度
mov          a,len
b0mov       rbank,#0
b0mov       epr_data,a
call       spi_send
b0mov       rbank,#1       ;写入后续参数
mov          a,len
b0mov       rbank,#0
b0bts0 FZ
jmp          send_len_over          ;len=0
b0mov       temp,a
b0mov       Y,#1
b0mov       Z,#sendbuf
send_len_byte:
b0mov       a,@YZ
b0mov       rbank,#0
b0mov       epr_data,a
call       spi_send
b0mov       rbank,#0
incms       Z
nop
decms       temp
jmp          send_len_byte
send_len_over:
b0bset spi_cs
call i2c_delay
;check the status
mov          a,#TRY_TIMES
b0mov       rbank,#1
mov          trytime,a
check_status:
b0mov       rbank,#0
b0bclr spi_cs
mov          a,#0ffh
b0mov       epr_data,a
call       spi_send
b0bset spi_cs
call i2c_delay
b0mov       a,spi_in
sub             a,#0ffh
b0bts0       FZ
jmp             wait_1ms       ;模块操作尚未完成
b0mov       a,spi_in
sub             a,#00h
b0bts0       FZ
jmp             succ_quit_00       ;操作成功
fail_quit:
b0bset       spi_cs
mov             a,#USB_FAIL
b0mov          rbank,#1
mov             usb_reslt,a
b0mov          rbank,#0
ret
wait_1ms:       //延时
b0mov z,#0f7h
b0mov y,#0e3h       ;稳定oscillator,40ms
delay_ms_02:
b0bset fwdrst
nop
nop
incms z
jmp delay_ms_02
nop
incms y
jmp delay_ms_02
b0mov rbank,#1
decms trytime
jmp       check_status
jmp       fail_quit
succ_quit_00:
b0mov       rbank,#0
b0bclr spi_cs
mov          a,#00h
b0mov       epr_data,a
call       spi_send
b0mov       a,spi_in
b0bts0       FZ
jmp          succ_quit
b0mov       temp,a
b0mov       Y,#1
b0mov       Z,#recvbuf
read_len_byte:
mov       a,#0
b0mov       rbank,#0
b0mov       epr_data,a
call       spi_send
b0mov       a,spi_in
b0mov       @YZ,a
b0mov       rbank,#0
incms       Z
nop
decms       temp
jmp          read_len_byte
succ_quit:
b0bset       spi_cs
mov             a,#USB_succ
b0mov          rbank,#1
mov             usb_reslt,a
b0mov          rbank,#0
ret
testusb://测试主程序
call          spi_ini                   //初始化spi
b0mov          rbank,#1                   //发送U盘是否连接好命令
mov             a,#CMD_DiskReady
mov             cmd,a
mov             a,#0
mov             len,a
b0mov          rbank,#0
call          spi_send_command
b0mov          rbank,#1
mov             a,usb_reslt
b0mov          rbank,#0
sub             a,#USB_succ
b0bts1       FZ
ret
;ok  diskread  ;sendbuf is 92+”TEST.DAT”          //创建文件”TEST.DAT”
b0mov          rbank,#0
b0mov          Y,#1
b0mov          Z,#sendbuf
mov             a,#92
b0mov          @yz,a
incms          Z
mov          a,#116
b0mov          @yz,a
incms          Z
mov             a,#101
b0mov          @yz,a
incms          Z
mov          a,#115
b0mov          @yz,a
incms          Z
mov          a,#116
b0mov          @yz,a
incms          Z
mov          a,#46
b0mov          @yz,a
incms          Z
mov          a,#100
b0mov          @yz,a
incms          Z
mov          a,#97
b0mov          @yz,a
incms          Z
mov          a,#116
b0mov          @yz,a
incms          Z
b0mov          rbank,#1
mov             a,#CMD_FileCreate          //创建文件命令
mov             cmd,a
mov             a,#10
mov             len,a
b0mov          rbank,#0
call          spi_send_command
b0mov          rbank,#1
mov             a,usb_reslt
b0mov          rbank,#0
sub             a,#USB_succ
b0bts1       FZ
ret
b0mov          rbank,#0
b0mov          Y,#1
b0mov          Z,#sendbuf
mov             a,#19
b0mov          @yz,a
incms          Z
mov          a,#33
b0mov          @yz,a
incms          Z
mov          a,#34
b0mov          @yz,a
incms          Z
mov          a,#35
b0mov          @yz,a
incms          Z
mov          a,#36
b0mov          @yz,a
incms          Z
mov          a,#37
b0mov          @yz,a
incms          Z
mov          a,#38
b0mov          @yz,a
incms          Z
mov          a,#39
b0mov          @yz,a
incms          Z
mov          a,#40
b0mov          @yz,a
incms          Z
mov          a,#41
b0mov          @yz,a
b0mov          rbank,#1
mov             a,#CMD_ByteWrite          //写入数据
mov             cmd,a
mov             a,#10
mov             len,a
b0mov          rbank,#0
call          spi_send_command
b0mov          rbank,#1
mov             a,#CMD_FileClose          //关闭文件
mov             cmd,a
mov             a,#1
mov             len,a
b0mov          rbank,#0
call          spi_send_command
ret
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