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ch347jtag: align tms/tdi uses to others cables

This commit is contained in:
Gwenhael Goavec-Merou 2026-02-21 10:26:57 +01:00
parent bf311f15c2
commit db7bd4770c
2 changed files with 20 additions and 13 deletions
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30
src/ch347jtag.cpp
View File

@ -138,8 +138,9 @@ int CH347Jtag::setClk(const uint8_t &factor) {
return 0;
}
CH347Jtag::CH347Jtag(uint32_t clkHZ, int8_t verbose, int vid, int pid, uint8_t bus_addr, uint8_t dev_addr):
_verbose(verbose>1), dev_handle(NULL), usb_ctx(NULL), obuf(_obuf)
CH347Jtag::CH347Jtag(uint32_t clkHZ, int8_t verbose, int vid, int pid,
uint8_t bus_addr, uint8_t dev_addr): _verbose(verbose>1),
dev_handle(NULL), usb_ctx(NULL), obuf(_obuf), _tdi(0), _tms(0)
{
libusb_device** devs;
int actual_length = 0;
@ -267,11 +268,12 @@ int CH347Jtag::_setClkFreq(uint32_t clkHZ)
}
int CH347Jtag::writeTMS(const uint8_t *tms, uint32_t len, bool flush_buffer,
__attribute__((unused)) const uint8_t tdi)
const uint8_t tdi)
{
// if (get_obuf_length() < (int)(len * 2 + 4)) { // check if there is enough room left
// flush();
// }
_tdi = (tdi) ? SIG_TDI : 0;
flush();
uint8_t *ptr = obuf;
for (uint32_t i = 0; i < len; ++i) {
@ -279,13 +281,14 @@ int CH347Jtag::writeTMS(const uint8_t *tms, uint32_t len, bool flush_buffer,
*ptr++ = CMD_BITS_WO;
ptr += 2; // leave place for length;
}
uint8_t x = ((tms[i >> 3] & (1 << (i & 7))) ? SIG_TMS : 0);
*ptr++ = x;
*ptr++ = x | SIG_TCK;
_tms = ((tms[i >> 3] & (1 << (i & 7))) ? SIG_TMS : 0);
const uint8_t val = _tms | _tdi;
*ptr++ = val;
*ptr++ = val | SIG_TCK;
int wlen = ptr - obuf;
if (wlen + 1 >= get_obuf_length() || i == len - 1) {
*ptr++ = x; // clear TCK
wlen = ptr - obuf;
*ptr++ = val; // clear TCK
wlen++;
obuf[1] = wlen - 3;
obuf[2] = (wlen - 3) >> 8;
int ret = usb_xfer(wlen, 0, 0, !flush_buffer);
@ -300,11 +303,11 @@ int CH347Jtag::writeTMS(const uint8_t *tms, uint32_t len, bool flush_buffer,
return len;
}
int CH347Jtag::toggleClk(uint8_t tms, uint8_t tdi, uint32_t len)
int CH347Jtag::toggleClk(__attribute__((unused)) uint8_t tms,
__attribute__((unused)) uint8_t tdi, uint32_t len)
{
uint8_t bits = 0;
if (tms) bits |= SIG_TMS;
if (tdi) bits |= SIG_TDI;
const uint8_t bits = _tms | _tdi;
if (!bits && len > 7) {
return writeTDI(0, 0, len, false);
}
@ -394,9 +397,10 @@ int CH347Jtag::writeTDI(const uint8_t *tx, uint8_t *rx, uint32_t len, bool end)
const uint8_t *bptr = tx + bytes;
for (unsigned i = 0; i < bits; ++i) {
uint8_t txb = (tx) ? bptr[i >> 3] : 0;
uint8_t _tdi = (txb & (1 << (i & 7))) ? SIG_TDI : 0;
_tdi = (txb & (1 << (i & 7))) ? SIG_TDI : 0;
x = _tdi;
if (end && i == bits - 1) {
_tms = SIG_TMS;
x |= SIG_TMS;
}
*ptr++ = x;

3
src/ch347jtag.hpp
View File

@ -44,4 +44,7 @@ class CH347Jtag : public JtagInterface {
uint8_t *obuf;
int get_obuf_length() const {return MAX_BUFFER - (obuf - _obuf);}
int usb_xfer(unsigned wlen, unsigned rlen, unsigned *actual, bool defer);
uint8_t _tdi;
uint8_t _tms;
};