diff options
Diffstat (limited to 'decoders/jtag_stm32')
| -rw-r--r-- | decoders/jtag_stm32/jtag_stm32.py | 48 |
1 files changed, 20 insertions, 28 deletions
diff --git a/decoders/jtag_stm32/jtag_stm32.py b/decoders/jtag_stm32/jtag_stm32.py index a1cb1b1..e23db74 100644 --- a/decoders/jtag_stm32/jtag_stm32.py +++ b/decoders/jtag_stm32/jtag_stm32.py @@ -85,6 +85,18 @@ def decode_device_id_code(bits): res = '0x%x' % int('0b' + bits[-1], 2) return (id_hex, ver, part, manuf, res) +def dpacc_data_in(bits): + data, a, rnw = bits[:-3], bits[-3:-1], bits[-1] + data_hex = '0x%x' % int('0b' + data, 2) + r = 'Read request' if (rnw == '1') else 'Write request' + return 'DATA: %s, A: %s, RnW: %s' % (data_hex, reg[a], r) + +def dpacc_data_out(bits): + data, ack = bits[:-3], bits[-3:] + data_hex = '0x%x' % int('0b' + data, 2) + ack_meaning = ack_val[ack] + return 'DATA: %s, ACK: %s' % (data_hex, ack_meaning) + class Decoder(srd.Decoder): api_version = 1 id = 'jtag_stm32' @@ -118,10 +130,13 @@ class Decoder(srd.Decoder): def handle_reg_idcode(self, bits): # TODO + # IDCODE is a read-only register which is always accessible. + # IR == IDCODE: The device ID code is shifted out via DR next. self.put(self.ss, self.es, self.out_ann, [0, ['IDCODE: %s (ver=%s, part=%s, manuf=%s, res=%s)' % \ decode_device_id_code(bits)]]) + # DPACC is used to access debug port registers (CTRL/STAT, SELECT, RDBUFF). # When transferring data IN: # Bits[34:3] = DATA[31:0]: 32bit data to transfer (write request) # Bits[2:1] = A[3:2]: 2-bit address of a debug port register @@ -133,21 +148,10 @@ class Decoder(srd.Decoder): self.put(self.ss, self.es, self.out_ann, [0, ['DPACC: ' + bits]]) # TODO: When to use Data IN / Data OUT? + self.put(self.ss, self.es, self.out_ann, [0, [dpacc_data_in(bits)]]) + self.put(self.ss, self.es, self.out_ann, [0, [dpacc_data_out(bits)]]) - # Data IN - data, a, rnw = bits[:-3], bits[-3:-1], bits[-1] - data_hex = '0x%x' % int('0b' + data, 2) - r = 'Read request' if (rnw == '1') else 'Write request' - s = 'DATA: %s, A: %s, RnW: %s' % (data_hex, reg[a], r) - self.put(self.ss, self.es, self.out_ann, [0, [s]]) - - # Data OUT - data, ack = bits[:-3], bits[-3:] - data_hex = '0x%x' % int('0b' + data, 2) - ack_meaning = ack_val[ack] - s = 'DATA: %s, ACK: %s' % (data_hex, ack_meaning) - self.put(self.ss, self.es, self.out_ann, [0, [s]]) - + # APACC is used to access all Access Port (AHB-AP) registers. # When transferring data IN: # Bits[34:3] = DATA[31:0]: 32bit data to shift in (write request) # Bits[2:1] = A[3:2]: 2-bit address (sub-address AP register) @@ -159,20 +163,8 @@ class Decoder(srd.Decoder): self.put(self.ss, self.es, self.out_ann, [0, ['APACC: ' + bits]]) # TODO: When to use Data IN / Data OUT? - - # Data IN - data, a, rnw = bits[:-3], bits[-3:-1], bits[-1] - data_hex = '0x%x' % int('0b' + data, 2) - r = 'Read request' if (rnw == '1') else 'Write request' - s = 'DATA: %s, A: %s, RnW: %s' % (data_hex, reg[a], r) - self.put(self.ss, self.es, self.out_ann, [0, [s]]) - - # Data OUT - data, ack = bits[:-3], bits[-3:] - data_hex = '0x%x' % int('0b' + data, 2) - ack_meaning = ack_val[ack] - s = 'DATA: %s, ACK: %s' % (data_hex, ack_meaning) - self.put(self.ss, self.es, self.out_ann, [0, [s]]) + self.put(self.ss, self.es, self.out_ann, [0, [dpacc_data_in(bits)]]) + self.put(self.ss, self.es, self.out_ann, [0, [dpacc_data_out(bits)]]) def handle_reg_abort(self, bits): # Bits[31:1]: reserved. Bit[0]: DAPABORT. |