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arch/arm/src/tiva/hardware: Initialize .bss sooner, Fix some PRCM register definitions

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configs/launchxl-cc1312r1:  Correct DIOs used to provide the UART0 serial console.

Status:  Board boots to NSH prompt now.  But I am not getting serial input.  Things are probably not very stable in general.
This commit is contained in:
Gregory Nutt
2019-02-12 16:35:14 -06:00
parent cf62b2288b
commit a2406c1ac8
7 changed files with 306 additions and 287 deletions
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configs/launchxl-cc1312r1/README.txt
+35 -7
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@@ -21,21 +21,30 @@ Status
development. Serious board development will occur later. Board
support is missing LED and button support.
2019-02-10: Figured out how to connect J-Link and began debug.
2019-02-12: Now hard-faults in tiva_lowsetup() here:
2019-02-12: A little progress. I do make it all the way into NSH:
352 ctl = getreg32(TIVA_CONSOLE_BASE + TIVA_UART_CTL_OFFSET);
ABCF
nx_start: Entry
uart_register: Registering /dev/console
uart_register: Registering /dev/ttyS0
work_hpstart: Starting high-priority kernel worker thread(s)
up_release_pending: From TCB=20000c00
nx_start_application: Starting init thread
Most likely UART0 clocking is not being enabled correctly.
NuttShell (NSH) NuttX-7.28
nsh> nx_start: CPU0: Beginning Idle Loop
But things are not very stable and I do not get any console input.
Serial Console
==============
The on-board XDS110 Debugger provide a USB virtual serial console using
UART0 (PA0/U0RX and PA1/U0TX).
UART0 (DIO2_RXD and DIO3_TXD).
A J-Link debugger is used (see below), then the RXD/TXD jumper pins can
be used to support a serial console through appropriate TTL level adapater
(RS-232 or USB serial).
be used to support a serial console through these same pins via an
appropriate TTL level adapater (RS-232 or USB serial).
LEDs and Buttons
================
@@ -133,5 +142,24 @@ Using J-Link
NOTE: When connecting the J-Link GDB server, the interface must be set to
JTAG, not SWD as you might expect.
The RXD/TXD pins. PA0/U0RX and PA1/U0TX, can then support a Serial console
The RXD/TXD pins, DIO2_RXD and DIO3_TXD, can then support a Serial console
using the appropriate TTL adapter (TTL to RS-232 or TTL to USB serial).
One odd behavior that I have found is after a reset from the J-Link, the
SP and PC registers are not automatically set and I had to manually set
them as shown below:
(gdb) target remote localhost:2331
(gdb) mon reset
(gdb) mon halt
(gdb) file nuttx
(gdb) mon memu32 0
Reading from address 0x00000000 (Data = 0x20001950)
(gdb) mon memu32 4
Reading from address 0x00000004 (Data = 0x00000139)
(gdb) mon reg sp 0x20001950
Writing register (SP = 0x20001950)
(gdb) mon reg pc 0x00000139
Writing register (PC = 0x00000139)
(gdb) n
232 cc13xx_trim_device();