STM32MP157 AP6236 WiFi蓝牙模块
STM32MP157 AP6236 WiFi蓝牙模块
移植参考开发板为100ASK_STM32MP157_V11。
1. 介绍
AP6236是采用BCM43430B0方案，2.4G单频单通道SDIO接口支持BT4.2单频蓝牙WiFi二合一模块。
2. 修改设备树
BCM43430B0 WiFi采用SDIO接口，蓝牙采用uart接口。下面我们给出必要配置，需要根据理解修改自己的设备树。SDIO接口使用的是sdmmc3， uart接口使用的是usart1 。因为i2c4的引脚和usart1 的引脚有重叠，所以我们先将其disabled以免影响。使能sdmmc3后mmc设备号发生了改变，sdmmc3对应0，sdmmc2(SD卡)对应1，sdmmc1(EMMC)对应2，所以后面需要修改Linux启动参数。
#include <dt-bindings/rtc/rtc-stm32.h>
/ {
aliases {
serial2 = &usart1;
};
vdd_wifi: regulator-vdd-wifi {
pinctrl-names = "default";
pinctrl-0 = <&vdd_wifi_pins_a>;
compatible = "regulator-fixed";
regulator-name = "vdd_wifi";
regulator-min-microvolt = <3300000>;
regulator-max-microvolt = <3300000>;
startup-delay-us = <70000>;
regulator-boot-on;
regulator-pull-down;
};
wifi_pwrseq: wifi-pwrseq {
compatible = "mmc-pwrseq-simple";
reset-gpios = <&gpioi 3 GPIO_ACTIVE_LOW>;
};
};
&pinctrl {
vdd_wifi_pins_a: vdd_wifi {
gpio {
pinmux = <STM32_PINMUX('H', 4, GPIO)>;
drive-push-down;
bias-pull-up;
output-low;
slew-rate = <0>;
};
};
};
&pinctrl_z {
usart1_pins_a: usart1-0 {
pins1 {
pinmux = <STM32_PINMUX('Z', 1, AF7)>, /* USART1_RX */
<STM32_PINMUX('Z', 3, AF7)>; /* USART1_CTS */
bias-disable;
};
pins2 {
pinmux = <STM32_PINMUX('Z', 2, AF7)>, /* USART1_TX */
<STM32_PINMUX('Z', 5, AF7)>; /* USART1_RTS */
bias-disable;
drive-push-pull;
slew-rate = <0>;
};
};
usart1_idle_pins_a: usart1-idle-1 {
pins1 {
pinmux = <STM32_PINMUX('Z', 2, ANALOG)>, /* USART1_TX */
<STM32_PINMUX('Z', 3, ANALOG)>; /* USART1_CTS */
};
pins2 {
pinmux = <STM32_PINMUX('Z', 5, AF7)>; /* USART1_RTS */
bias-disable;
drive-push-pull;
slew-rate = <0>;
};
pins3 {
pinmux = <STM32_PINMUX('Z', 1, AF7)>; /* USART1_RX */
bias-disable;
};
};
usart1_sleep_pins_a: usart1-sleep-0 {
pins {
pinmux = <STM32_PINMUX('Z', 1, ANALOG)>, /* USART1_RX */
<STM32_PINMUX('Z', 2, ANALOG)>, /* USART1_TX */
<STM32_PINMUX('Z', 3, ANALOG)>, /* USART1_CTS */
<STM32_PINMUX('Z', 5, ANALOG)>; /* USART1_RTS */
};
};
};
&rtc {
st,lsco = <RTC_OUT2_RMP>;
pinctrl-0 = <&rtc_out2_rmp_pins_a>;
pinctrl-names = "default";
status = "okay";
};
&sdmmc3 {
pinctrl-names = "default", "opendrain", "sleep";
pinctrl-0 = <&sdmmc3_b4_pins_a>;
pinctrl-1 = <&sdmmc3_b4_od_pins_a>;
pinctrl-2 = <&sdmmc3_b4_sleep_pins_a>;
arm,primecell-periphid = <0x10153180>;
non-removable;
st,neg-edge;
bus-width = <4>;
vmmc-supply = <&vdd_wifi>;
mmc-pwrseq = <&wifi_pwrseq>;
#address-cells = <1>;
#size-cells = <0>;
keep-power-in-suspend;
status = "okay";
brcmf: bcrmf@1 {
reg = <1>;
compatible = "brcm,bcm4329-fmac";
};
};
&usart1 {
pinctrl-names = "default", "sleep", "idle";
pinctrl-0 = <&usart1_pins_a>;
pinctrl-1 = <&usart1_sleep_pins_a>;
pinctrl-2 = <&usart1_idle_pins_a>;
uart-has-rtscts;
status = "okay";
bluetooth {
shutdown-gpios = <&gpioa 14 GPIO_ACTIVE_HIGH>;
compatible = "brcm,bcm43438-bt";
max-speed = <3000000>;
};
};
3. 配置Linux内核
ST官方提供的BSP支持包中的配置已默认支持了BCM43436B0模块，我们下面简单列出必要的配置。
3.1 配置支持WiFi设备
Device Drivers --->
[*] Network device support --->
[*] Wireless LAN --->
[*] Broadcom devices
<M> Broadcom FullMAC WLAN driver
[*] SDIO bus interface support for FullMAC driver
<*> Broadcom specific AMBA --->
--- Broadcom specific AMBA
[*] Support for BCMA in a SoC
[*] ChipCommon-attached serial flash support
[*] BCMA Broadcom GBIT MAC COMMON core driver
[*] BCMA GPIO driver
3.2 配置支持IEEE 802.11
[*] Networking support --->
-*- Wireless --->
<M> cfg80211 - wireless configuration API
<M> Generic IEEE 802.11 Networking Stack (mac80211)
3.3 配置支持蓝牙
[*] Networking support --->
<M> Bluetooth subsystem support --->
[*] Bluetooth Classic (BR/EDR) features
[*] Bluetooth Low Energy (LE) features
<M> Bluetooth 6LoWPAN support
[*] Export Bluetooth internals in debugfs
Bluetooth device drivers --->
<M> HCI UART driver
[*] Broadcom protocol support
4. 配置Buildroot
测试使用WiFi和蓝牙需要用到bluez和wpa_supplicant工具，直接从Buildroot中添加这两个工具。另外我们将根文件系统分区调大至500M，因为我们要将内核的模块全部安装到跟文件系统。
Target packages --->
Networking applications --->
[*] bluez-utils
[*] build tools
[*] install deprecated tools
[*] wireless tools
[*] wpa_supplicant --->
[*] Enable nl80211 support
5. 板子配置
编译并下载，启动开发板。由于EMMC的设备号发生了改变，所以需要更改u-boot的Linux的启动参数。
#SD卡设置
setenv bootcmd 'ext4load mmc 1:8 c2000000 uImage; ext4load mmc 1:8 c4000000 stm32mp157d-100ask.dtb; bootm c2000000 - c4000000'
setenv bootargs 'console=ttySTM0,115200 root=/dev/mmcblk1p9 rootwait rw'
#EMMC设置
setenv bootcmd 'ext4load mmc 2:6 c2000000 uImage; ext4load mmc 2:6 c4000000 stm32mp157d-100ask.dtb; bootm c2000000 - c4000000'
setenv bootargs 'console=ttySTM0,115200 root=/dev/mmcblk2p7 rootwait rw'
由于我们编译Linux内核将一些组件编译成了模块，所以要使用这些组件的功能必须将模块安装进跟文件系统中。使用make ARCH=arm INSTALL_MOD_PATH="$PWD/install_artifact" modules_install命令将Linux模块安装在install_artifact目录中，然后我们将install_artifact目录下的所有文件拷贝到根文件系统的根目录下。
重启开发板，打印显示没有找到相应的固件。
我们需要BCM43430B0.hcd、brcmfmac43430b0-sdio.txt、brcmfmac43430b0-sdio.bin、brcmfmac43430b0-sdio.st,stm32mp157d-100ask.txt、brcmfmac43430b0-sdio.st,stm32mp157d-100ask.bin 这几个文件复制到/lib/firmware/brcm目录中，其中brcmfmac43430b0-sdio.txt和brcmfmac43430b0-sdio.st,stm32mp157d-100ask.txt、brcmfmac43430b0-sdio.bin和brcmfmac43430b0-sdio.st,stm32mp157d-100ask.bin是一样的只是文件名不同。这几个文件可在网上自找，也可在我的BSP工程的rootfs-patch文件夹中获取。
6. 验证
6.1 WiFi
修改/etc/wpa_supplicant.conf文件，配置要连接的WiFi。
#ctrl_interface=/var/run/wpa_supplicant
ap_scan=1
network={
ssid="WiFi名"
psk="密码"
priority=0
}
修改/etc/network/interfaces文件，添加如下配置自动获取IP并连接WiFi。
auto wlan0
iface wlan0 inet dhcp
pre-up wpa_supplicant -B -Dnl80211 -iwlan0 -c/etc/wpa_supplicant.conf
post-down killall -q wpa_supplicant
重启开发板，可以看到wlan0网卡启动正常，上网正常。
6.2 蓝牙
使用hciconfig -a查看蓝牙设备，启动蓝牙hciconfig hci0 up。
打开手机蓝牙设为可被发现，使用hcitool scan扫描附件蓝牙设备，l2ping搜索到的设备正常。
移植源码获取：
git clone https://github.com/Sonboy97/arm-ostl-linux-gnueabi.git
版本：cc0bae894417d0985d6567dd7674cea303848cdd