Add gps, debug dongle support and pressure alt tables

GPS also pulled in serial support. The altitude tables take raw 11-bit
pressure sample numbers and convert them to standard pressure altitude
values.

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 216 insertions, 0 deletions

diff --git a/ao_dbg.c b/ao_dbg.c
new file mode 100644
index 00000000..3ccfa052
--- /dev/null
+++ b/ao_dbg.c
@@ -0,0 +1,216 @@
+/*
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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)
+{
+	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)
+{
+	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)
+{
+	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);
+}
+