def wr_ir(self, ir):
"""write instruction register"""
if self.ir == ir:
# no changes
return
#print('ir[%s]' % ir_name[ir])
self.device.wr_ir(bits.from_val(ir, _IR_LEN))
self.ir = ir
def ir_survey(self):
"""return a string with all IR values and the DR lengths"""
s = []
for ir in range((1 << self.irlen)):
self.wr_ir(bits.from_val(ir, self.irlen))
try:
n = self.chain.dr_length() - self.devs_after - self.devs_before
s.append('ir %d drlen %d' % (ir, n))
except:
s.append('ir %d drlen unknown' % ir)
return '\n'.join(s)
def rw_apacc(self, rnw, adr, val):
"""write to and readback from the selected apacc register"""
x = (val << 3) | ((adr >> 1) & 0x06) | rnw
self.wr_ir(_IR_APACC)
rd = self.device.rw_dr(bits.from_val(x, _DR_APACC_LEN))
ack, val = rd.split((3, 32))
if ack == _ACK_WAIT:
raise jtag_dp_error('JTAG-DP ACK timeout')
if ack != _ACK_OK_FAULT:
raise jtag_dp_error('JTAG-DP invalid ACK')
return val
def wr_abort(self, val): """write abort register""" self.wr_ir(_IR_ABORT) self.device.wr_dr(bits.from_val(val, _DR_ABORT_LEN))