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/*
* Copyright © 2009 Keith Packard <keithp@keithp.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "ao.h"
#define DBG_CLOCK (1 << 3)
#define DBG_DATA (1 << 4)
#define DBG_RESET_N (1 << 5)
#define DBG_CLOCK_PIN (P0_3)
#define DBG_DATA_PIN (P0_4)
#define DBG_RESET_N_PIN (P0_5)
static void
ao_dbg_send_bits(uint8_t msk, uint8_t val)
{
P0 = (P0 & ~msk) | (val & msk);
}
#define ao_dbg_pause() do { _asm nop; nop; nop _endasm; } while (0);
void
ao_dbg_send_byte(uint8_t byte)
{
__xdata uint8_t b, d;
P0 |= DBG_DATA;
P0DIR |= DBG_DATA;
for (b = 0; b < 8; b++) {
d = 0;
if (byte & 0x80)
d = DBG_DATA;
byte <<= 1;
ao_dbg_send_bits(DBG_CLOCK|DBG_DATA, DBG_CLOCK|d);
ao_dbg_pause();
ao_dbg_send_bits(DBG_CLOCK|DBG_DATA, 0 |d);
ao_dbg_pause();
}
P0DIR &= ~DBG_DATA;
}
uint8_t
ao_dbg_recv_byte(void)
{
__xdata uint8_t byte, b;
byte = 0;
for (b = 0; b < 8; b++) {
byte = byte << 1;
ao_dbg_send_bits(DBG_CLOCK, DBG_CLOCK);
ao_dbg_pause();
if (DBG_DATA_PIN)
byte |= 1;
ao_dbg_send_bits(DBG_CLOCK, 0);
ao_dbg_pause();
}
return byte;
}
/* 8051 instructions
*/
#define NOP 0x00
#define MOV_direct_data 0x75
#define LJMP 0x02
#define MOV_Rn_data(n) (0x78 | (n))
#define DJNZ_Rn_rel(n) (0xd8 | (n))
#define MOV_A_direct 0xe5
#define MOV_direct1_direct2 0x85
#define MOV_direct_A 0xf5
#define MOV_DPTR_data16 0x90
#define MOV_A_data 0x74
#define MOVX_atDPTR_A 0xf0
#define MOVX_A_atDPTR 0xe0
#define INC_DPTR 0xa3
#define TRAP 0xa5
#define SJMP 0x80
#define JB 0x20
#define DEBUG_INSTR(l) (0x54 | (l))
#define SFR_PSW 0xD0
#define SFR_DPL0 0x82
#define SFR_DPH0 0x83
#define SFR_DPL1 0x84
#define SFR_DPH1 0x85
__xdata uint8_t save_acc;
__xdata uint8_t save_psw;
__xdata uint8_t save_dpl0;
__xdata uint8_t save_dph0;
__xdata uint8_t save_dpl1;
__xdata uint8_t save_dph1;
static uint8_t
ao_dbg_inst1(uint8_t a) __reentrant
{
ao_dbg_send_byte(DEBUG_INSTR(1));
ao_dbg_send_byte(a);
return ao_dbg_recv_byte();
}
static uint8_t
ao_dbg_inst2(uint8_t a, uint8_t b) __reentrant
{
ao_dbg_send_byte(DEBUG_INSTR(2));
ao_dbg_send_byte(a);
ao_dbg_send_byte(b);
return ao_dbg_recv_byte();
}
static uint8_t
ao_dbg_inst3(uint8_t a, uint8_t b, uint8_t c) __reentrant
{
ao_dbg_send_byte(DEBUG_INSTR(3));
ao_dbg_send_byte(a);
ao_dbg_send_byte(b);
ao_dbg_send_byte(c);
return ao_dbg_recv_byte();
}
void
ao_dbg_start_transfer(uint16_t addr)
{
save_acc = ao_dbg_inst1(NOP);
save_psw = ao_dbg_inst2(MOV_A_direct, SFR_PSW);
save_dpl0 = ao_dbg_inst2(MOV_A_direct, SFR_DPL0);
save_dph0 = ao_dbg_inst2(MOV_A_direct, SFR_DPH0);
save_dpl1 = ao_dbg_inst2(MOV_A_direct, SFR_DPL1);
save_dph1 = ao_dbg_inst2(MOV_A_direct, SFR_DPH1);
ao_dbg_inst3(MOV_DPTR_data16, addr >> 8, addr);
}
void
ao_dbg_end_transfer(void)
{
ao_dbg_inst3(MOV_direct_data, SFR_DPL0, save_dpl0);
ao_dbg_inst3(MOV_direct_data, SFR_DPH0, save_dph0);
ao_dbg_inst3(MOV_direct_data, SFR_DPL1, save_dpl1);
ao_dbg_inst3(MOV_direct_data, SFR_DPH1, save_dph1);
ao_dbg_inst3(MOV_direct_data, SFR_PSW, save_psw);
ao_dbg_inst2(MOV_A_data, save_acc);
}
void
ao_dbg_write_byte(uint8_t byte)
{
ao_dbg_inst2(MOV_A_data, byte);
ao_dbg_inst1(MOVX_atDPTR_A);
ao_dbg_inst1(INC_DPTR);
}
uint8_t
ao_dbg_read_byte(void)
{
ao_dbg_inst1(MOVX_A_atDPTR);
return ao_dbg_inst1(INC_DPTR);
}
static void
ao_dbg_set_pins(void)
{
/* Disable peripheral use of P0 */
ADCCFG = 0;
P0SEL = 0;
/* make P0_4 tri-state */
P0INP = DBG_DATA;
P2INP &= ~(P2INP_PDUP0_PULL_DOWN);
/* Raise RESET_N and CLOCK */
P0 = DBG_RESET_N | DBG_CLOCK;
/* RESET_N and CLOCK are outputs now */
P0DIR = DBG_RESET_N | DBG_CLOCK;
}
void
ao_dbg_debug_mode(void)
{
ao_dbg_set_pins();
ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA|DBG_RESET_N);
ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, 0 |DBG_DATA| 0 );
ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA| 0 );
ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, 0 |DBG_DATA| 0 );
ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA| 0 );
ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, 0 |DBG_DATA|DBG_RESET_N);
}
void
ao_dbg_reset(void)
{
ao_dbg_set_pins();
ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA|DBG_RESET_N);
ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA| 0 );
ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA| 0 );
ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA| 0 );
ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA| 0 );
ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA|DBG_RESET_N);
}
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