From: hackbard Date: Mon, 9 Apr 2007 14:42:05 +0000 (+0000) Subject: jtag via bitbanging of port d X-Git-Url: https://hackdaworld.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=07f700caf7db1d12cf0dde7627ced350d162d107;p=my-code%2Ffpga.git jtag via bitbanging of port d --- diff --git a/fx2/fx2.c b/fx2/fx2.c index 90e40e9..3a57b12 100644 --- a/fx2/fx2.c +++ b/fx2/fx2.c @@ -32,6 +32,8 @@ xdata at 0xe601 volatile u8 IFCONFIG; /* endpoint configuration */ xdata at 0xe604 volatile u8 FIFORESET; xdata at 0xe60b volatile u8 REVCTL; +xdata at 0xe610 volatile u8 EP1OUTCFG; +xdata at 0xe611 volatile u8 EP1INCFG; xdata at 0xe612 volatile u8 EP2CFG; xdata at 0xe613 volatile u8 EP4CFG; xdata at 0xe614 volatile u8 EP6CFG; @@ -45,6 +47,19 @@ xdata at 0xe621 volatile u8 EP2AUTOINLENL; xdata at 0xe624 volatile u8 EP6AUTOINLENH; xdata at 0xe625 volatile u8 EP6AUTOINLENL; +/* endpoint control/status */ +xdata at 0xe6a1 volatile u8 EP1OUTCS; +xdata at 0xe6a2 volatile u8 EP1INCS; +xdata at 0xe68d volatile u16 EP1OUTBC; +xdata at 0xe68f volatile u16 EP1INBC; + +#define STALL 0x01 +#define BUSY 0x02 + +/* access to endpoint buffers */ +xdata at 0xe780 volatile u8 EP1OUTBUF[64]; +xdata at 0xe7c0 volatile u8 EP1INBUF[64]; + /* special funtion registers */ sfr at 0xb5 OED; sfr at 0xb0 IOD; @@ -83,6 +98,23 @@ void toggle_power() { } +void jtag_init() { + + /* pin 5 of port d disables tdi -> tdo forward */ + OED|=(1<<5); + IOD|=(1<<5); + + /* jtag pins: + * tdi - pin 0 (input) + * tdo - pin 2 (output) + * tms - pin 3 (output) + * tck - pin 4 (output) + */ + OED|=((1<<2)|(1<<3)|(1<<4)); + OED&=~(1<<0); + +} + void cpu_init() { /* cpu initialization: (0x10) @@ -186,6 +218,11 @@ void ep1_init() { * default (valid, bulk) fits! */ + /* arm ep1out, clear ep1out and ep1in stall bit */ + EP1OUTBC=1; + EP1OUTCS&=~STALL; + EP1INCS&=~STALL; + } void fx2_init() { @@ -206,12 +243,24 @@ void fx2_init() { void main() { + u8 buf; + /* initialize the fx2 */ fx2_init(); - /* do the job ... */ + /* jtag by polling ep1 */ while(1) { - + if(!(EP1OUTCS&BUSY)) { + buf=EP1OUTBUF[0]; + buf&=0x1c; + IOD|=buf; + EP1OUTBC=1; + } + if(!(EP1INCS&BUSY)) { + buf=IOD&0x01?1:0; + EP1INBUF[0]=buf; + EP1INBC=1; + } } }