--- /dev/null
+/*
+ * 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"
+#include "ao_pins.h"
+
+static void
+ao_dbg_send_bits(uint8_t msk, uint8_t val) __reentrant
+{
+ DBG_PORT = (DBG_PORT & ~msk) | (val & msk);
+ _asm
+ nop
+ nop
+ _endasm;
+}
+
+void
+ao_dbg_send_byte(uint8_t byte)
+{
+ __pdata uint8_t b, d;
+
+ DBG_PORT |= DBG_DATA;
+ DBG_PORT_DIR |= 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_send_bits(DBG_CLOCK|DBG_DATA, 0 |d);
+ }
+ DBG_PORT_DIR &= ~DBG_DATA;
+}
+
+uint8_t
+ao_dbg_recv_byte(void)
+{
+ __pdata uint8_t byte, b;
+
+ byte = 0;
+ for (b = 0; b < 8; b++) {
+ byte = byte << 1;
+ ao_dbg_send_bits(DBG_CLOCK, DBG_CLOCK);
+ if (DBG_DATA_PIN)
+ byte |= 1;
+ ao_dbg_send_bits(DBG_CLOCK, 0);
+ }
+ 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
+
+__pdata uint8_t save_acc;
+__pdata uint8_t save_psw;
+__pdata uint8_t save_dpl0;
+__pdata uint8_t save_dph0;
+__pdata uint8_t save_dpl1;
+__pdata 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)
+{
+ /* Make the DBG pins GPIOs. On TeleMetrum, this will
+ * disable the SPI link, so don't expect SPI to work after
+ * using the debugger.
+ */
+ DBG_PORT_SEL &= ~(DBG_CLOCK|DBG_DATA|DBG_RESET_N);
+
+ /* make DBG_DATA tri-state */
+ DBG_PORT_INP |= DBG_DATA;
+
+ /* Raise RESET_N and CLOCK */
+ DBG_PORT |= DBG_RESET_N | DBG_CLOCK;
+
+ /* RESET_N and CLOCK are outputs now */
+ DBG_PORT_DIR |= DBG_RESET_N | DBG_CLOCK;
+ DBG_PORT_DIR &= ~DBG_DATA;
+}
+
+static void
+ao_dbg_long_delay(void)
+{
+ uint8_t n;
+
+ for (n = 0; n < 20; n++)
+ _asm nop _endasm;
+}
+
+#define AO_RESET_LOW_DELAY AO_MS_TO_TICKS(100)
+#define AO_RESET_HIGH_DELAY AO_MS_TO_TICKS(100)
+
+void
+ao_dbg_debug_mode(void)
+{
+ ao_dbg_set_pins();
+ ao_dbg_long_delay();
+ ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA|DBG_RESET_N);
+ ao_dbg_long_delay();
+ ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, 0 |DBG_DATA| 0 );
+ ao_delay(AO_RESET_LOW_DELAY);
+ ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA| 0 );
+ ao_dbg_long_delay();
+ ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, 0 |DBG_DATA| 0 );
+ ao_dbg_long_delay();
+ ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA| 0 );
+ ao_dbg_long_delay();
+ ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, 0 |DBG_DATA|DBG_RESET_N);
+ ao_delay(AO_RESET_HIGH_DELAY);
+}
+
+void
+ao_dbg_reset(void)
+{
+ ao_dbg_set_pins();
+ ao_dbg_long_delay();
+ ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA|DBG_RESET_N);
+ ao_dbg_long_delay();
+ ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA| 0 );
+ ao_delay(AO_RESET_LOW_DELAY);
+ ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA| 0 );
+ ao_dbg_long_delay();
+ ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA| 0 );
+ ao_dbg_long_delay();
+ ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA| 0 );
+ ao_dbg_long_delay();
+ ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA|DBG_RESET_N);
+ ao_delay(AO_RESET_HIGH_DELAY);
+}
+
+static void
+debug_enable(void)
+{
+ ao_dbg_debug_mode();
+}
+
+static void
+debug_reset(void)
+{
+ ao_dbg_reset();
+}
+
+static void
+debug_put(void)
+{
+ for (;;) {
+ ao_cmd_white ();
+ if (ao_cmd_lex_c == '\n')
+ break;
+ ao_cmd_hex();
+ if (ao_cmd_status != ao_cmd_success)
+ break;
+ ao_dbg_send_byte(ao_cmd_lex_i);
+ }
+}
+
+static void
+debug_get(void)
+{
+ __pdata uint16_t count;
+ __pdata uint16_t i;
+ __pdata uint8_t byte;
+ ao_cmd_hex();
+ if (ao_cmd_status != ao_cmd_success)
+ return;
+ count = ao_cmd_lex_i;
+ if (count > 256) {
+ ao_cmd_status = ao_cmd_syntax_error;
+ return;
+ }
+ for (i = 0; i < count; i++) {
+ if (i && (i & 7) == 0)
+ putchar('\n');
+ byte = ao_dbg_recv_byte();
+ ao_cmd_put8(byte);
+ putchar(' ');
+ }
+ putchar('\n');
+}
+
+static uint8_t
+getnibble(void)
+{
+ __pdata char c;
+
+ c = getchar();
+ if ('0' <= c && c <= '9')
+ return c - '0';
+ if ('a' <= c && c <= 'f')
+ return c - ('a' - 10);
+ if ('A' <= c && c <= 'F')
+ return c - ('A' - 10);
+ ao_cmd_status = ao_cmd_lex_error;
+ return 0;
+}
+
+static void
+debug_input(void)
+{
+ __pdata uint16_t count;
+ __pdata uint16_t addr;
+ __pdata uint8_t b;
+ __pdata uint8_t i;
+
+ ao_cmd_hex();
+ count = ao_cmd_lex_i;
+ ao_cmd_hex();
+ addr = ao_cmd_lex_i;
+ if (ao_cmd_status != ao_cmd_success)
+ return;
+ ao_dbg_start_transfer(addr);
+ i = 0;
+ while (count--) {
+ if (!(i++ & 7))
+ putchar('\n');
+ b = ao_dbg_read_byte();
+ ao_cmd_put8(b);
+ }
+ ao_dbg_end_transfer();
+ putchar('\n');
+}
+
+static void
+debug_output(void)
+{
+ __pdata uint16_t count;
+ __pdata uint16_t addr;
+ __pdata uint8_t b;
+
+ ao_cmd_hex();
+ count = ao_cmd_lex_i;
+ ao_cmd_hex();
+ addr = ao_cmd_lex_i;
+ if (ao_cmd_status != ao_cmd_success)
+ return;
+ ao_dbg_start_transfer(addr);
+ while (count--) {
+ b = getnibble() << 4;
+ b |= getnibble();
+ if (ao_cmd_status != ao_cmd_success)
+ return;
+ ao_dbg_write_byte(b);
+ }
+ ao_dbg_end_transfer();
+}
+
+__code struct ao_cmds ao_dbg_cmds[7] = {
+ { debug_enable, "D\0Enable debug" },
+ { debug_get, "G <count>\0Get data" },
+ { debug_input, "I <count> <addr>\0Input <count> at <addr>" },
+ { debug_output, "O <count> <addr>\0Output <count> at <addr>" },
+ { debug_put, "P <byte> ...\0Put data" },
+ { debug_reset, "R\0Reset" },
+ { 0, NULL },
+};
+
+void
+ao_dbg_init(void)
+{
+ ao_cmd_register(&ao_dbg_cmds[0]);
+}
projects / fw / altos / blobdiff