fw: generate binaries with 1M baud for dongles

Many popular dongles such as the Sonoff CC2652P dongle and Slaesh
CC2652RB dongle contain Silicon Labs CP2102 USB/UART adapters that
support a maximum baud rate of 1M. These devices also don't have
XDS110 debuggers, so they instead use the ROM bootloader for flashing.
The JelmerT/cc2538-bsl utility doesn't support ELF files, so I'll ship
binaries to directly write to flash instead.

fw/build_all_platforms.sh

@@ -18,7 +18,7 @@ cp sniffle.out builds/sniffle_cc2652rb.out
 
 make clean
 make -j3 PLATFORM=CC1352P1F3
-cp sniffle.out builds/sniffle_cc1352p1.out
+cp sniffle.out builds/sniffle_cc1352p1_cc2652p1.out
 
 make clean
 make -j3 PLATFORM=CC2652R74
@@ -35,3 +35,13 @@ cp sniffle.out builds/sniffle_cc2651p3.out
 make clean
 make -j3 PLATFORM=CC1354P106
 cp sniffle.out builds/sniffle_cc1354p10.out
+
+# Export .bin files for CP2102 based dongles with 1M baud, so they can be
+# flashed with cc2538-bsl without needing objdump to convert .out to .bin
+make clean
+make -j3 PLATFORM=CC2652RB1F_1M
+cp sniffle.bin builds/sniffle_cc2652rb_1M.bin
+
+make clean
+make -j3 PLATFORM=CC2652P1F_1M
+cp sniffle.bin builds/sniffle_cc1352p1_cc2652p1_1M.bin

fw/makefile

@@ -10,13 +10,15 @@ NAME = sniffle
 
 CC26X2R1_PLATFORMS = CC2642R1F CC2652R1F
 CC1352R1_PLATFORMS = CC1352R1F3
-CC2652RB_PLATFORMS = CC2652RB1F
-CC1352P1_PLATFORMS = CC1352P1F3
+CC2652RB_PLATFORMS = CC2652RB1F CC2652RB1F_1M
+CC1352P1_PLATFORMS = CC1352P1F3 CC2652P1F CC1352P1F3_1M CC2652P1F_1M
 CC2652R7_PLATFORMS = CC2652R74
 CC1352P7_PLATFORMS = CC1352P74
 CC2651P3_PLATFORMS = CC2651P31
 CC1354P10_PLATFORMS = CC1354P106
 
+1M_BAUD_PLATFORMS = CC2652RB1F_1M CC1352P1F3_1M CC2652P1F_1M
+
 SUPPORTED_PLATFORMS = \
     $(CC26X2R1_PLATFORMS) \
     $(CC1352R1_PLATFORMS) \
@@ -80,6 +82,10 @@ ifneq ($(filter $(PLATFORM), $(CC1354P10_PLATFORMS)),)
     HARD_FLOAT = 2
 endif
 
+ifneq ($(filter $(PLATFORM), $(1M_BAUD_PLATFORMS)),)
+    CFLAGS += -DUART_1M_BAUD
+endif
+
 ifeq ($(HARD_FLOAT),2)
     CFLAGS += -mfloat-abi=hard -mfpu=fpv5-sp-d16 -mcpu=cortex-m33
     LFLAGS += -mfloat-abi=hard -mfpu=fpv5-sp-d16 -mcpu=cortex-m33

fw/messenger.c

@@ -13,7 +13,11 @@
 
 UART2_Handle uart;
 
+#ifdef UART_1M_BAUD
+static const uint32_t BAUD_RATE = 1000000;
+#else
 static const uint32_t BAUD_RATE = 2000000;
+#endif
 
 int messenger_init()
 {