2 * Copyright © 2009 Keith Packard <keithp@keithp.com>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 2 of the License.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
20 #define DBG_CLOCK (1 << 3)
21 #define DBG_DATA (1 << 4)
22 #define DBG_RESET_N (1 << 5)
24 #define DBG_CLOCK_PIN (P0_3)
25 #define DBG_DATA_PIN (P0_4)
26 #define DBG_RESET_N_PIN (P0_5)
29 ao_dbg_send_bits(uint8_t msk, uint8_t val)
31 P0 = (P0 & ~msk) | (val & msk);
34 #define ao_dbg_pause() do { _asm nop; nop; nop _endasm; } while (0);
37 ao_dbg_send_byte(uint8_t byte)
43 for (b = 0; b < 8; b++) {
48 ao_dbg_send_bits(DBG_CLOCK|DBG_DATA, DBG_CLOCK|d);
50 ao_dbg_send_bits(DBG_CLOCK|DBG_DATA, 0 |d);
57 ao_dbg_recv_byte(void)
59 __xdata uint8_t byte, b;
62 for (b = 0; b < 8; b++) {
64 ao_dbg_send_bits(DBG_CLOCK, DBG_CLOCK);
68 ao_dbg_send_bits(DBG_CLOCK, 0);
77 #define MOV_direct_data 0x75
79 #define MOV_Rn_data(n) (0x78 | (n))
80 #define DJNZ_Rn_rel(n) (0xd8 | (n))
81 #define MOV_A_direct 0xe5
82 #define MOV_direct1_direct2 0x85
83 #define MOV_direct_A 0xf5
84 #define MOV_DPTR_data16 0x90
85 #define MOV_A_data 0x74
86 #define MOVX_atDPTR_A 0xf0
87 #define MOVX_A_atDPTR 0xe0
93 #define DEBUG_INSTR(l) (0x54 | (l))
101 __xdata uint8_t save_acc;
102 __xdata uint8_t save_psw;
103 __xdata uint8_t save_dpl0;
104 __xdata uint8_t save_dph0;
105 __xdata uint8_t save_dpl1;
106 __xdata uint8_t save_dph1;
109 ao_dbg_inst1(uint8_t a)
111 ao_dbg_send_byte(DEBUG_INSTR(1));
113 return ao_dbg_recv_byte();
117 ao_dbg_inst2(uint8_t a, uint8_t b)
119 ao_dbg_send_byte(DEBUG_INSTR(2));
122 return ao_dbg_recv_byte();
126 ao_dbg_inst3(uint8_t a, uint8_t b, uint8_t c)
128 ao_dbg_send_byte(DEBUG_INSTR(3));
132 return ao_dbg_recv_byte();
136 ao_dbg_start_transfer(uint16_t addr)
138 save_acc = ao_dbg_inst1(NOP);
139 save_psw = ao_dbg_inst2(MOV_A_direct, SFR_PSW);
140 save_dpl0 = ao_dbg_inst2(MOV_A_direct, SFR_DPL0);
141 save_dph0 = ao_dbg_inst2(MOV_A_direct, SFR_DPH0);
142 save_dpl1 = ao_dbg_inst2(MOV_A_direct, SFR_DPL1);
143 save_dph1 = ao_dbg_inst2(MOV_A_direct, SFR_DPH1);
144 ao_dbg_inst3(MOV_DPTR_data16, addr >> 8, addr);
148 ao_dbg_end_transfer(void)
150 ao_dbg_inst3(MOV_direct_data, SFR_DPL0, save_dpl0);
151 ao_dbg_inst3(MOV_direct_data, SFR_DPH0, save_dph0);
152 ao_dbg_inst3(MOV_direct_data, SFR_DPL1, save_dpl1);
153 ao_dbg_inst3(MOV_direct_data, SFR_DPH1, save_dph1);
154 ao_dbg_inst3(MOV_direct_data, SFR_PSW, save_psw);
155 ao_dbg_inst2(MOV_A_data, save_acc);
159 ao_dbg_write_byte(uint8_t byte)
161 ao_dbg_inst2(MOV_A_data, byte);
162 ao_dbg_inst1(MOVX_atDPTR_A);
163 ao_dbg_inst1(INC_DPTR);
167 ao_dbg_read_byte(void)
169 ao_dbg_inst1(MOVX_A_atDPTR);
170 return ao_dbg_inst1(INC_DPTR);
174 ao_dbg_set_pins(void)
176 /* Disable peripheral use of P0 */
181 /* make P0_4 tri-state */
183 P2INP &= ~(P2INP_PDUP0_PULL_DOWN);
185 /* Raise RESET_N and CLOCK */
186 P0 = DBG_RESET_N | DBG_CLOCK;
188 /* RESET_N and CLOCK are outputs now */
189 P0DIR = DBG_RESET_N | DBG_CLOCK;
193 ao_dbg_debug_mode(void)
196 ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA|DBG_RESET_N);
197 ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, 0 |DBG_DATA| 0 );
198 ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA| 0 );
199 ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, 0 |DBG_DATA| 0 );
200 ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA| 0 );
201 ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, 0 |DBG_DATA|DBG_RESET_N);
208 ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA|DBG_RESET_N);
209 ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA| 0 );
210 ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA| 0 );
211 ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA| 0 );
212 ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA| 0 );
213 ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA|DBG_RESET_N);