The patch
Make: use gcc as LD
introduced use of GCC wrapper as linker. LD variable references GCC
executable now. But when GCC wrapper s used to build relocatable
loadable objects (ELF executables and modules) then it causes
linking of toolchain default libc and other libraries even when -r
is usd. Another problem is that incorrect multiarch variant is selected
for libraries search and possibly even for LTO or C++ templates
instantiating and other glue code which causes fails during linking
if CFLAGS selects non/default miltiarch variant.
Corresponding CFLAGS are passed to LDMODULEFLAGS and LDELFFLAGS
as well as -nostartfiles -nodefaultlibs options.
Separate line is used to easily find and adjust lines if link
process is changed in future.
Signed-off-by: Pavel Pisa <ppisa@pikron.com>
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README
======
Spresense is a compact development board based on Sony’s power-efficient
multicore microcontroller CXD5602. It allows developers to create IoT
applications in a very short time and is supported by the Arduino IDE as well
as the more advanced NuttX based SDK.
- Integrated GPS
The embedded GNSS with support for GPS, QZSS and GLONASS enables applications
where tracking is required.
- Hi-res audio output and multi mic inputs
Advanced 192kHz/24 bit audio codec and amplifier for audio output, and
support for up to 8 mic input channels.
- Multicore microcontroller
Spresense is powered by Sony's CXD5602 microcontroller (ARM® Cortex®-M4F × 6
cores), with a clock speed of 156 MHz.
Refer to https://developer.sony.com/develop/spresense/ for further information
about this board.
NOTICE:
To run the nuttx, bootloader for Spresense SDK 2.1.0 or later must be installed.
Configuration sub-directories
-----------------------------
elf
This is a configuration to test apps/examples/elf.
module
This is a configuration to test apps/examples/module.
posix_spawn
This is a configuration to test apps/examples/posix_spawn.
smp
This is a configuration to run Spresense in SMP mode.
wifi
This is a configuration for Spresense + Wi-Fi addon (Telit GS2200M) module.
With this configuration, (1) you can connect Spresense to an existing Wi-Fi
access point (2.4GHz 802.11b/g/n are supported) or (2) you can make
Spresense as a Wi-Fi access point. In both cases, you can login to the
Spresense with telnet, also access to a webserver (NOTE: this case you need
an extension board with microSDHC card)
(1) Station (STA) mode
To run the module in Station mode (i.e. to connect to an existing Wi-Fi
access point), You need to specify SSID with passcode.
nsh> gs2200m ssid-to-connect passcode &
If the connection succeeded, IP address is statically assigned.
nsh> ifconfig
wlan0 Link encap:Ethernet HWaddr 3c:95:09:00:69:92 at UP
inet addr:10.0.0.2 DRaddr:10.0.0.1 Mask:255.255.255.0
Then, you can run DHCP client (renew command) to obtain IP address as well
as DNS server information. (NOTE: In current configuration, DHCP client on
GS2200M is disabled. If you enable the internal DHCP client, you can not
use DNS client on NuttX)
nsh> renew wlan0 &
renew [6:100]
nsh> ifconfig
wlan0 Link encap:Ethernet HWaddr 3c:95:09:00:69:92 at UP
inet addr:192.168.1.101 DRaddr:192.168.1.1 Mask:255.255.255.0
Now, you can run telnetd and webserver on Spresense.
nsh> telnetd &
telnetd [7:100]
nsh> webserver &
webserver [9:100]
nsh> Starting webserver
Also, you can run NTP client to adjust the RTC on Spresense. (NOTE: we
assume your network can access to pool.ntp.org, otherwise, you can specify
CONFIG_NETUTILS_NTPCLIENT_SERVER)
nsh> date
Jan 01 00:00:36 1970
nsh> ntpcstart
Started the NTP daemon as PID=11
nsh> date
Jul 30 06:42:13 2019
(2) Access Point (AP) mode
To run the module in AP mode, you need to specify SSID to advertise and
WPA2-PSK passphrase or WEP-key. (NOTE: in AP mode, you can also specify
channel number to use. Also, you need to set CONFIG_WL_GS2200M_ENABLE_WEP=y
if you want to use WEP instead of WPA2-PSK)
nsh> gs2200m -a ssid-to-advertise 8-to-63-wpa2-psk-passphrase &
or
nsh> gs2200m -a ssid-to-advertise 10-hex-digits-wep-key &
If the module was initialized in AP mode, you can see a new IP address is
assigned.
nsh> ifconfig
wlan0 Link encap:Ethernet HWaddr 3c:95:09:00:69:93 at UP
inet addr:192.168.11.1 DRaddr:192.168.11.1 Mask:255.255.255.0
Now you can connect your PC to the AP with the above SSID and WPA2-PSK
passphrase or WEP-key which you specified.
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