DHCOM STM32MP1 Linux: Difference between revisions
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==== Set up WiFi AP ==== | ==== Set up WiFi AP ==== | ||
Create new AP configuration file | |||
nano /etc/hostapd_myAP.conf | |||
Insert the following to the file: (SSID = rsiwifi and default password = rsiTest1) | |||
ctrl_interface=/var/run/hostapd | |||
ctrl_interface_group=0 | |||
interface=wlan0 | |||
ssid=rsiwifi | |||
hw_mode=g | |||
channel=6 | |||
wpa=2 | |||
wpa_passphrase=rsiTest1 | |||
wpa_key_mgmt=WPA-PSK | |||
Configure the AP wlan0 interface or start DHCP server on it etc. | |||
nano /etc/systemd/network/80-wlan0.network | |||
Insert the following to the file: | |||
[Match] | |||
Path=platform-soc | |||
[Network] | |||
Address=11.11.11.11/24 | |||
DHCPServer=yes | |||
-> Reboot the system | |||
Start hostapd to start the AP: | |||
hostapd -d hostapd_DRC02.conf >/dev/null & | |||
Kill the connection: | |||
1. fg -> hostapd --> foreground | |||
2. Strg + C | |||
ip link set wlan0 down | |||
==== How to enable WiFi/BT support, if missing? How to configure RSI mode (WiFi alone, Bluetooth, ...)? ==== | ==== How to enable WiFi/BT support, if missing? How to configure RSI mode (WiFi alone, Bluetooth, ...)? ==== | ||
The needed sdmmc3 interface will be activated by the stm32mp15xx-dhcom-som.dtsi file. This is included by default with picoITX, PDK2 and DRC02 configuration. | The needed sdmmc3 interface will be activated by the stm32mp15xx-dhcom-som.dtsi file. This is included by default with picoITX, PDK2 and DRC02 configuration. | ||
Revision as of 09:15, 5 October 2021
Linux virtual machine for development
- Please have a look at: Virtual Machine for Application Development
Linux Kernel
How to build a Kernel
|
Get sources from Github
Configure and build the Device Tree + Kernel
Create the FIT-image with our script (Download link)
|
Kernel Userspace Interfaces to Access Hardware
Control GPIOs
- Show gpio definition in Linux
gpioinfo
- Note:
- gpiochip0 = STM port-A, gpiochip1 = STM port-B, ...
DHCOM Name: alt. DHCOM Name: SO-DIMM Pin# CPU Pad Name gpiod label: GPIO A 154 PF3 DHCOM-A GPIO B 156 PD6 DHCOM-B GPIO C 162 PG0 DHCOM-C GPIO D 163 PD12 DHCOM-D GPIO E 164 PC6 DHCOM-E GPIO F 165 PD11 DHCOM-F GPIO G 167 PI0 DHCOM-G GPIO H 173 PI2 DHCOM-H GPIO I 175 PI3 DHCOM-I GPIO J CIF HSYNC 74 PH8 DHCOM-J GPIO K CIF PCLK 72 PA6 DHCOM-K GPIO L CIF MCLK 70 PG8 DHCOM-L GPIO M CIF VSYNC 68 PI5 DHCOM-M GPIO N CIF D9 66 PH7 DHCOM-N GPIO O CIF D8 64 PI1 DHCOM-O GPIO P CIF D7 62 PE6 DHCOM-P GPIO Q CIF D6 60 PB8 DHCOM-Q GPIO R CIF D5 58 PI4 DHCOM-R GPIO S CIF D4 56 PH14 DHCOM-S GPIO T CIF D3 54 PH12 DHCOM-T GPIO U CIF D2 52 PH11 DHCOM-U GPIO V CIF D1 50 PH10 DHCOM-V GPIO W CIF D0 48 PH9 DHCOM-W INT HIGHEST PRIORITY 151 PI8 DHCOM-INT
- Set state
gpioset $(gpiofind DHCOM-<#>)=0 gpioset $(gpiofind DHCOM-<#>)=1
- or
gpioset gpiochip<port#> <pin#>=0 gpioset gpiochip<port#> <pin#>=1
- Get state
gpioget $(gpiofind DHCOM-<#>)
- or
gpioget gpiochip<port#> <pin#>
RS-485 (only picoITX or DRC02)
- RS-485 device
DHCOM UART 2 /dev/ttySTM2
- Compilation on target
gcc tty_rs485_test_v1.1.c -o tty_rs485_test gcc tty_rs485_flags_v1.0.c -o tty_rs485_flags
- Show UART flags
./tty_rs485_flags /dev/ttySTM2
- Set tty device to raw mode
stty -F /dev/ttySTM2 115200 raw -echo -echoe
- Send data with demo program
echo -n -e "\n\rHallo RS485 Welt!" ¦ ./tty_rs485_test /dev/ttySTM2
- Receive data with demo program
./tty_rs485_test /dev/ttySTM2
- Download example source code
CAN interface
- Setup CAN interface with baudrate 500kbit/sec.
ip link set can0 up type can bitrate 500000
- Start to listen on CAN port
candump can0
- Send test message
cansend can0 100#11.2233.44556677.88
- Deinitialize CAN port
ip link set can0 down
UART Interfaces
DHCOM UART 1 /dev/ttySTM0 DHCOM UART 2 /dev/ttySTM2 DHCOM UART 3 /dev/ttySTM1
I2C Interfaces
DHCOM I2C 1 /dev/i2c-1 DHCOM I2C 2 /dev/i2c-0 On Module Devices /dev/i2c-2
ADC/DAC Interfaces
DHCOM Name SO-DIMM Pin# PDK2 Header Linux device sysfs in/out name STM32MP1 pin AD0 8 X18 Pin 8 iio:device2 in_voltage0_* ANA0 AD1 6 X18 Pin 6 iio:device3 in_voltage1_* ANA1 AD2 4 X18 Pin 4 iio:device0 out_voltage1_* PA4_DAC_OUT1 AD3 2 X18 Pin 2 iio:device1 out_voltage2_* PA5_DAC_OUT2
ADC inputs
- sysfs path
/sys/bus/iio/devices/iio:device*
- Show offset and voltage scale
cat in_voltage_scale cat in_voltage_offset
- Notes:
- Voltage = (RAW + OFFSET) * SCALE
- Maximum input voltage = 2.9V (VDDA is connected to PMIC LDO1)
- Read analog value
cat in_voltage*_raw
DAC outputs
- sysfs path
/sys/bus/iio/devices/iio:device*
- Show output voltage scale
cat out_voltage*_scale
- Enable DAC
echo 0 > out_voltage*_powerdown
- Notes:
- Voltage = RAW * SCALE
- Maximum output voltage = 2.9V (VDDA is connected to PMIC LDO1)
- Set analog output value
echo xxxx > out_voltage*_raw
FAQ
Connect to WiFi network with WPA2 PSK
Establish connection
wpa_passphrase "SSID" >/etc/wpa_supplicant.conf
-> In the next step, please enter the password
ip link set wlan0 up wpa_supplicant -i wlan0 -c /etc/wpa_supplicant.conf & udhcpc -i wlan0
Disconnect
fg
-> Moves a background process wpa_supplicant on your current Linux shell to the foreground. Then Press "Strg + C" to end the process.
ip link set wlan0 down
Set up WiFi AP
Create new AP configuration file
nano /etc/hostapd_myAP.conf
Insert the following to the file: (SSID = rsiwifi and default password = rsiTest1)
ctrl_interface=/var/run/hostapd ctrl_interface_group=0 interface=wlan0 ssid=rsiwifi hw_mode=g channel=6 wpa=2 wpa_passphrase=rsiTest1 wpa_key_mgmt=WPA-PSK
Configure the AP wlan0 interface or start DHCP server on it etc.
nano /etc/systemd/network/80-wlan0.network
Insert the following to the file:
[Match] Path=platform-soc [Network] Address=11.11.11.11/24 DHCPServer=yes
-> Reboot the system
Start hostapd to start the AP:
hostapd -d hostapd_DRC02.conf >/dev/null &
Kill the connection:
1. fg -> hostapd --> foreground
2. Strg + C
ip link set wlan0 down
How to enable WiFi/BT support, if missing? How to configure RSI mode (WiFi alone, Bluetooth, ...)?
The needed sdmmc3 interface will be activated by the stm32mp15xx-dhcom-som.dtsi file. This is included by default with picoITX, PDK2 and DRC02 configuration.
Next to this the kernel module is needed. The Yocto build instructions can be found at the following file: https://github.com/dh-electronics/meta-dhsom-stm32-bsp/blob/dunfell-3.1/conf/machine/dh-stm32mp1-dhcom-picoitx.conf
# Ship kernel modules MACHINE_ESSENTIAL_EXTRA_RDEPENDS += " linux-firmware-rs9116 " KERNEL_MODULE_AUTOLOAD += " rsi_sdio " KERNEL_MODULE_PROBECONF += " rsi_sdio " module_conf_rsi_sdio = "options rsi_sdio dev_oper_mode=1"
If you are using a different root filesystem (compared to our Yocto configuration) please ensure, that the firmware files and the rsi_sdio.conf file are included in the filesystem:
- rsi_firmware.zip
- Copy the directory rsi to /lib/firmware/
- Copy the file rsi_sdio.conf to /etc/modprobe.d/
Note to DRC02:
DRC02 default images with date Oct. 2021 or newer support WiFi/BT by an additional device tree overlay. To use the DTO, please add it to the U-Boot environment:
setenv loaddtos '#conf-stm32mp153c-dhcom-drc02.dtb#conf-stm32mp15xx-dhcom-drc02-overlay-wifi-rsi.dtbo'
RSI mode:
By default, the RSI module is configured to WiFi alone mode with our Yocto image. The mode can be configured by rsi_sdio.conf file:
According to Linux kernel source, the dev_oper_mode has the following meaning: linux-2.6$ git grep -n DEV_OPMODE_ drivers/net/wireless/rsi/ [...] drivers/net/wireless/rsi/rsi_hal.h:21:#define DEV_OPMODE_WIFI_ALONE 1 drivers/net/wireless/rsi/rsi_hal.h:22:#define DEV_OPMODE_BT_ALONE 4 drivers/net/wireless/rsi/rsi_hal.h:23:#define DEV_OPMODE_BT_LE_ALONE 8 drivers/net/wireless/rsi/rsi_hal.h:24:#define DEV_OPMODE_BT_DUAL 12 drivers/net/wireless/rsi/rsi_hal.h:25:#define DEV_OPMODE_STA_BT 5 drivers/net/wireless/rsi/rsi_hal.h:26:#define DEV_OPMODE_STA_BT_LE 9 drivers/net/wireless/rsi/rsi_hal.h:27:#define DEV_OPMODE_STA_BT_DUAL 13 drivers/net/wireless/rsi/rsi_hal.h:28:#define DEV_OPMODE_AP_BT 6 drivers/net/wireless/rsi/rsi_hal.h:29:#define DEV_OPMODE_AP_BT_DUAL 14
If you like to use Bluetooth alone mode, change dev_oper_mode to 12. Then you can use the standard hci commands. Start with 'hciconfig hci0 up' to activate the interface.
USB 1.1 problems: Custom board without USB 2.0 hub inbetween the MP1 USB host port?
And in that case, have a look at arch/arm/boot/dts/stm32mp15xx-dhcom-picoitx.dtsi and how the OHCI (!) is enabled there. And of course, make sure the kernel config options are enabled accordingly (like for the PicoITX machine)
|
meta-dhsom-stm32-bsp$ git grep OHCI |
|
recipes-kernel/linux/linux-stable/5.10/dh-stm32mp1-common/dh-stm32mp1-dhsom-common.cfg:CONFIG_USB_OHCI_HCD=y |
arch/arm/boot/dts/stm32mp15xx-dhcom-picoitx.dtsi snippet:
&usbh_ehci {
phys = <&usbphyc_port0>;
status = "okay";
};
&usbh_ohci { // <---------------- HERE
phys = <&usbphyc_port0>;
status = "okay";
};
&usbotg_hs {
dr_mode = "otg";
pinctrl-0 = <&usbotg_hs_pins_a>;
pinctrl-names = "default";
phy-names = "usb2-phy";
phys = <&usbphyc_port1 0>;
vbus-supply = <&vbus_otg>;
status = "okay";
};
&usbphyc {
status = "okay";
};
&usbphyc_port0 {
phy-supply = <&vdd_usb>;
vdda1v1-supply = <®11>;
vdda1v8-supply = <®18>;
};
&usbphyc_port1 {
phy-supply = <&vdd_usb>;
vdda1v1-supply = <®11>;
vdda1v8-supply = <®18>;
};
System stability or USB Host problems?
If a display with higher resolution and pixel clock > 48 MHz is used, then this can case USB host and/or system stability problems.
Workaround: The OSPEEDR must be set to OSPEEDR = 1 for LCD_CLK and OSPEEDR = 0 for all other LTDC signals.
&pinctrl {
ltdc_pins_ customhmi: ltdc-dh-1 {
pins1 {
pinmux = <STM32_PINMUX('I', 14, AF14)>; /* LCD_CLK */
bias-disable;
drive-push-pull;
slew-rate = <1>;
};
pins2 {
pinmux = <STM32_PINMUX('I', 12, AF14)>, /* LCD_HSYNC */
<STM32_PINMUX('I', 13, AF14)>, /* LCD_VSYNC */
...
<STM32_PINMUX('K', 6, AF14)>; /* LCD_B7 */
bias-disable;
drive-push-pull;
slew-rate = <0>;
};
};
ltdc_sleep_pins_ customhmi: ltdc-sleep-dh-1 {
pins {
pinmux = <STM32_PINMUX('I', 14, ANALOG)>, /* LCD_CLK */
...
<STM32_PINMUX('K', 6, ANALOG)>; /* LCD_B7 */
};
};
};
USB OTG: Custom board where the USB-OTG port is only used as host?
On the DHCOM standard, the second USB port of the STM32MP1 is usually an USB-OTG port. If you have a custom board where you want to use the USB-OTG port in host mode only, you should consider the following:
The USB-OTG controller on the STM32MP1, DWC2, does support host mode but is rather inefficient (in comparison to a dedicated USB host controller). The following block diagram shows, that it is possible on the STM32MP1 to alter the pinmuxing, so that the USB-OTG port is used with the USB Host controller of the STM32MP1 (instead of using the DWC2 OTG controller):
Host port#1: EHCI/OHCI controller _________ HS PHY port #1 (SoC balls D+/D- #1)
Host port#2: EHCI/OHCI controller __
\
|_____ HS PHY port #2 (SoC balls D+/D- #2)
DWC2 OTG controller_________________/|
|
UTIM switch__________________|
This change can be made in the device tree with disabling the DWC2 controller and adding the second usb_phyc port to the nodes of usbh_ehci and (if applicable) usbh_ohci. These nodes are usually in the .dtsi file of the board (e.g. for the PicoITX: arch/arm/boot/dts/stm32mp15xx-dhcom-picoitx.dtsi). Here a is snippet how this could look like:
&usbh_ehci {
phys = <&usbphyc_port0>, <&usbphyc_port1 1>; // <-------- HERE
status = "okay";
};
&usbh_ohci {
phys = <&usbphyc_port0>, <&usbphyc_port1 1>; // <-------- HERE
status = "okay";
};
&usbotg_hs {
status = "disabled"; // <-------- HERE
};
&usbphyc {
status = "okay";
};
&usbphyc_port0 {
phy-supply = <&vdd_usb>;
vdda1v1-supply = <®11>;
vdda1v8-supply = <®18>;
};
&usbphyc_port1 {
phy-supply = <&vdd_usb>;
vdda1v1-supply = <®11>;
vdda1v8-supply = <®18>;
};
How to try QtWebengine
The QtWebengine is part of the DH default images. Please stop the Weston desktop, before the start of the Browser.
Older images: "systemctl stop weston@root.service" Newer images: "systemctl stop weston.service"
How to start the Browser:
QT_QPA_PLATFORM=eglfs QT_QPA_EGLFS_ALWAYS_SET_MODE=1 QT_QPA_EGLFS_KMS_CONFIG=/etc/default/qt5-eglfs-kms.json qtwebengine-minimal http://YOUR-TEST-PAGE/ --no-sandbox
