Switch DBG pins to GPIO when using any debug commands. Reboot to restore.

[fw/altos] / src / ao_dbg.c

diff --git a/src/ao_dbg.c b/src/ao_dbg.c
index 2988aed4491eab019b5b65c4d5a0d827c3612002..0d9ec8c0db958a306b9b3b5bc95f1bdf0e14ac3e 100644 (file)
--- a/src/ao_dbg.c
+++ b/src/ao_dbg.c
@@ -164,6 +164,12 @@ ao_dbg_read_byte(void)
 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;
 
@@ -175,30 +181,54 @@ ao_dbg_set_pins(void)
        DBG_PORT_DIR &= ~DBG_DATA;
 }
 
-#define ao_reset_delay()       ao_delay(AO_MS_TO_TICKS(20))
+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_reset_delay();
-       ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA|DBG_RESET_N);       ao_reset_delay();
-       ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA|    0      );       ao_reset_delay();
-       ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N,     0    |DBG_DATA|    0      );       ao_reset_delay();
-       ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA|    0      );       ao_reset_delay();
-       ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N,     0    |DBG_DATA|    0      );       ao_reset_delay();
-       ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA|    0      );       ao_reset_delay();
-       ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA|DBG_RESET_N);       ao_reset_delay();
-       ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N,     0    |DBG_DATA|DBG_RESET_N);       ao_reset_delay();
+       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_reset_delay();
-       ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA|DBG_RESET_N);       ao_reset_delay();
-       ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA|    0      );       ao_reset_delay();
-       ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N, DBG_CLOCK|DBG_DATA|DBG_RESET_N);       ao_reset_delay();
-       ao_dbg_send_bits(DBG_CLOCK|DBG_DATA|DBG_RESET_N,     0    |DBG_DATA|DBG_RESET_N);       ao_reset_delay();
+       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