EZ-USB CY7C68013A固件Slave FIFO初始化
//EP2 Auto OUT 2*1024bytes bulk
//EP6 Auto IN 2*1024bytes bulk,
void TD_Init( void ) // Called once at startup
{
CPUCS = 0x10; //48MHz operation
REVCTL=0x03; //Cypress推薦設置dyn_out=1, enh_pkt=1
SYNCDELAY;
//配置引腳FLAGA,FLAGB,FLAGC,FLAGD輸出FIFO狀態
PINFLAGSAB = 0x00; //根據FIFOADR[1:0]指向的端點，FLAGA定義爲PF
//FLAGB定義爲FULL
SYNCDELAY; //同步延時
PINFLAGSCD = 0x00; // FLAGC定義爲EMPTY，FLAGD不使用
SYNCDELAY;
//配置端口A的複用引腳PORTA.7功能
PORTACFG = 0x00; //PA7/FLAGD作爲端口引腳PA7，不作爲FIFO的狀態標誌-FLAGD
SYNCDELAY;
//設置所有的FIFO接口引腳低電壓/高電平有效
FIFOPINPOLAR = 0x00; //Slave FIFO接口引腳低電平有效
SYNCDELAY;
//配置接口的工作模式(端口、GPIF、Slave FIFO)
IFCONFIG = 0x43; //外部IFCLK外部時鐘，48MHz，IFCLK不輸出內部時鐘
//不反相IFCLK引腳信號，同步傳輸，Slave FIFO工作模式
SYNCDELAY;
//不使用EP4和EP8
EP2CFG = 0xAA; //out 1024 bytes, 2x, bulk
SYNCDELAY;
EP6CFG = 0xAA; // in 1024 bytes, 2x, bulk
SYNCDELAY;
EP4CFG = 0x02; //clear valid bit
SYNCDELAY;
EP8CFG = 0x02; //clear valid bit
SYNCDELAY;
//復位FIFOS(EP2、EP6)到默認狀態(FIFO flags、byte counts)
FIFORESET = 0x80; // activate NAK-ALL to avoid race conditions
SYNCDELAY;
FIFORESET = 0x02; // reset, FIFO 2
SYNCDELAY;
FIFORESET = 0x06; // reset, FIFO 6
SYNCDELAY;
FIFORESET = 0x00; // deactivate NAK-ALL，restore normal operation
SYNCDELAY;
//配置FIFO端點EP2和EP6
EP2FIFOCFG = 0x11; // AUTOOUT=1, WORDWIDE=1(16位數據傳輸)
SYNCDELAY;
EP6FIFOCFG = 0x09; //AUTOIN=1 , WORDWIDE=1(16位數據傳輸)
SYNCDELAY;
//設置AUTOIN時自動傳輸的包大小（注意，不能大於IN端點的緩衝區的大小）
EP6AUTOINLENH = 0x04; //Auto-commit 1024-byte packets
SYNCDELAY;
EP6AUTOINLENL = 0x00;
SYNCDELAY;
//清空EP2、EP6端點緩衝區(2個緩衝區要清空2次)
OUTPKTEND = 0x82; //Arm two OUT EP2 buffers to “prime the pump”
SYNCDELAY; //For OUT endpoints, you need to arm the buffers to let the SIE take
OUTPKTEND = 0x82; // control of them, and accept data from the host.
SYNCDELAY;
INPKTEND = 0x86; //“arming” the IN transfer
SYNCDELAY;
INPKTEND = 0x86;
SYNCDELAY;
}