altos: Place rom config variables in fixed location

The device serial number and radio calibration values are stored in
flash, mostly so that TeleDongle gets them saved.

Placing them in well-known locations (starting at 0xa0) makes it
possible to find the previous configuration and to re-write it
easily, without requiring the .map file.

altosui doesn't have the .map file parsing code, so it relies upon
this new technique. As a benefit, it reads the old values from the
device before reprogramming it.

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

1 files changed, 11 insertions, 1 deletions

diff --git a/src/ao.h b/src/ao.h
index 5f2b8339..9c418db2 100644
--- a/src/ao.h
+++ b/src/ao.h
@@ -290,6 +290,17 @@ void
 ao_led_init(uint8_t enable);
 
 /*
+ * ao_romconfig.c
+ */
+
+#define AO_ROMCONFIG_VERSION	1
+
+extern __code __at (0x00a0) uint16_t ao_romconfig_version;
+extern __code __at (0x00a2) uint16_t ao_romconfig_check;
+extern __code __at (0x00a4) uint16_t ao_serial_number;
+extern __code __at (0x00a6) uint32_t ao_radio_cal;
+
+/*
  * ao_usb.c
  */
 
@@ -998,7 +1009,6 @@ ao_rssi_init(uint8_t rssi_led);
  */
 
 extern const uint8_t ao_usb_descriptors [];
-extern const uint16_t ao_serial_number;
 extern const char ao_version[];
 extern const char ao_manufacturer[];
 extern const char ao_product[];