由 sujingliang 贡献，Ai-Thinker 进行整理
【Ai-WB2评测】BLE+PWM控制RGB灯
一、RGB灯控制APP 找了一个app可以通过BLE控制RGB灯
其BLE控制RGB命令格式如下：
| 0x4e | 0x4f | 0x30 | 0x4 | 0xc5 | 0x0 | 0xff | 0xff | 0xf1 |
|---|---|---|---|---|---|---|---|---|
| 固定格式 | 固定格式 | 固定格式 | 固定格式 | RED | GREEN | BLUE | ALPHA | 未知 |
命令共9个字节 头四字节固定为0x4e 0x4f 0x30 0x4 ,可以用来判断后面是控制RGB的指令 第5个字节为RED 第6个字节为GREEN 第7个字节为BLUE 第8个字节为ALPHA 第9个字节没弄明白是什么，没有使用
二、编写BLE从机程序 以applications/bluetooth/ble_slave为模板。
1、增加PWM控制RGB灯代码 pwmled.h
📜 点击展开完整代码
java
#ifndef __PWM_LED_H__
#define __PWM_LED_H__
// pwmled.h
#include <bl602.h>
#include <bl602_gpio.h>
#include <bl_pwm.h>
BL_Err_Type
PWM_Smart_Configure2
(PWM_CH_ID_Type ch, uint16_t clkDiv, uint16_t period,uint16_t threshold2)
;
void
pwm_led_init
(
void
)
;
void
pwm_led_set
(uint8_t red,uint8_t green,uint8_t blue)
;
void
rgb_control
(uint8_t red, uint8_t green, uint8_t blue, uint8_t alpha)
;
#endifBL_Err_Type PWM_Smart_Configure2(PWM_CH_ID_Type ch, uint16_t clkDiv, uint16_t period,uint16_t threshold2); 配置PWM参数
void pwm_led_init(void); 初始化PWM
void pwm_led_set(uint8_t red,uint8_t green,uint8_t blue); 设置3个RGB LED
void rgb_control(uint8_t red, uint8_t green, uint8_t blue, uint8_t alpha); 加上alpha控制3个RGB LED
pwmled.c实现函数
📜 点击展开完整代码
java
#include <FreeRTOS.h>
#include <task.h>
#include <blog.h>
#include <bl602.h>
#include <bl602_gpio.h>
#include <bl602_glb.h>
#include <bl_pwm.h>
#include
"pwmled.h"
#define
PWM_Get_Channel_Reg
(ch)
(PWM_BASE+PWM_CHANNEL_OFFSET+(ch)*
0x20
)
#define
PWM_STOP_TIMEOUT_COUNT
(
160
*
1000
)
GLB_GPIO_Cfg_Type cfg[
3
] = {
{
.drive =
0
,
.smtCtrl =
1
,
.gpioMode = GPIO_MODE_OUTPUT,
.pullType = GPIO_PULL_DOWN,
.gpioPin =
14
,
/// red
.gpioFun =
8
,
},
{
.drive =
0
,
.smtCtrl =
1
,
.gpioMode = GPIO_MODE_OUTPUT,
.pullType = GPIO_PULL_DOWN,
.gpioPin =
17
,
/// green
.gpioFun =
8
,
},
{
.drive =
0
,
.smtCtrl =
1
,
.gpioMode = GPIO_MODE_OUTPUT,
.pullType = GPIO_PULL_DOWN,
.gpioPin =
3
,
/// blue
.gpioFun =
8
,
},
};
/// @brief Copy from PWM_Smart_Configure. Use Bus Clock instead of External Crystal Clock for PWM Timer
/// @param ch PWM Channel
/// @param clkDiv PWM clock divider
/// @param period PWM period
/// @param threshold2
/// @return
BL_Err_Type
PWM_Smart_Configure2
(PWM_CH_ID_Type ch, uint16_t clkDiv, uint16_t period,uint16_t threshold2)
{
uint32_t tmpVal;
uint32_t
timeoutCnt
=
PWM_STOP_TIMEOUT_COUNT;
/* Get channel register */
uint32_t
PWMx
=
PWM_Get_Channel_Reg(ch);
tmpVal = BL_RD_REG(PWMx, PWM_CONFIG);
// if(BL_GET_REG_BITS_VAL(tmpVal, PWM_REG_CLK_SEL) != PWM_CLK_XCLK){
if
(BL_GET_REG_BITS_VAL(tmpVal, PWM_REG_CLK_SEL) != PWM_CLK_BCLK){
BL_WR_REG(PWMx, PWM_CONFIG, BL_SET_REG_BIT(tmpVal, PWM_STOP_EN));
while
(!BL_IS_REG_BIT_SET(BL_RD_REG(PWMx, PWM_CONFIG), PWM_STS_TOP)){
timeoutCnt--;
if
(timeoutCnt ==
0
){
return
TIMEOUT;
}
}
// tmpVal = BL_SET_REG_BITS_VAL(tmpVal, PWM_REG_CLK_SEL, PWM_CLK_XCLK);
tmpVal = BL_SET_REG_BITS_VAL(tmpVal, PWM_REG_CLK_SEL, PWM_CLK_BCLK);
}
tmpVal = BL_SET_REG_BITS_VAL(tmpVal, PWM_OUT_INV, PWM_POL_NORMAL);
tmpVal = BL_SET_REG_BITS_VAL(tmpVal, PWM_STOP_MODE, PWM_STOP_GRACEFUL);
BL_WR_REG(PWMx, PWM_CONFIG, tmpVal);
/* Config pwm division */
BL_WR_REG(PWMx, PWM_CLKDIV, clkDiv);
/* Config pwm period and duty */
BL_WR_REG(PWMx, PWM_PERIOD, period);
BL_WR_REG(PWMx, PWM_THRE1,
0
);
BL_WR_REG(PWMx, PWM_THRE2, threshold2);
return
SUCCESS;
}
void
pwm_led_init
(
void
)
{
for
(
int
i
=
0
; i <
3
; i++) {
GLB_GPIO_Init(cfg + i);
PWM_CH_ID_Type
ch
=
cfg[i].gpioPin % PWM_CH_MAX;
PWM_Channel_Disable(ch);
}
}
void
pwm_led_set
(uint8_t red,uint8_t green,uint8_t blue)
{
PWM_Smart_Configure2(
2
,
80
,
255
, green);
PWM_Channel_Enable(
2
);
PWM_Smart_Configure2(
3
,
80
,
255
, blue);
PWM_Channel_Enable(
3
);
PWM_Smart_Configure2(
4
,
80
,
255
, red);
PWM_Channel_Enable(
4
);
}
void
rgb_control
(uint8_t red, uint8_t green, uint8_t blue, uint8_t alpha)
{
uint8_t t_red,t_green,t_blue;
// 应用透明度/亮度
t_red = red*alpha/
255
;
t_green = green*alpha/
255
;
t_blue = blue*alpha/
255
;
pwm_led_set(t_red,t_green,t_blue);
}2、ble_interface.c中修改如下
📜 点击展开完整代码
java
static
ssize_t
ble_uuid1_write_val
(struct bt_conn *conn, const struct bt_gatt_attr *attr,
const
void
*buf, u16_t len, u16_t offset,
u8_t flags)
{
uint8_t *recv_buffer;
recv_buffer = pvPortMalloc(sizeof(uint8_t) * len);
memcpy(recv_buffer, buf, len);
printf(
"recv ble data len: %d\r\n"
, len);
if
(recv_buffer[
0
]==
0x4e
&&recv_buffer[
1
]==
0x4f
&&recv_buffer[
2
]==
0x30
&&recv_buffer[
3
]==
0x04
){
//pwm_led_set(recv_buffer[4],recv_buffer[5],recv_buffer[6]);
rgb_control(recv_buffer[
4
],recv_buffer[
5
],recv_buffer[
6
],recv_buffer[
7
]);
printf(
"pwm_led_set\r\n"
);
}
for
(
size_t
i
=
0
; i < len; i++)
{
printf(
"0x%x "
, recv_buffer[i]);
}
printf(
"\r\n"
);
vPortFree(recv_buffer);
return
len;
}其中增加了：
📜 点击展开完整代码
java
if
(recv_buffer[
0
]==
0x4e
&&recv_buffer[
1
]==
0x4f
&&recv_buffer[
2
]==
0x30
&&recv_buffer[
3
]==
0x04
){
//pwm_led_set(recv_buffer[4],recv_buffer[5],recv_buffer[6]);
rgb_control(recv_buffer[
4
],recv_buffer[
5
],recv_buffer[
6
],recv_buffer[
7
]);
printf(
"pwm_led_set\r\n"
);
}即当UUID1收到写入值后，判断头4个字节是否为0x4e 0x4f 0x30 0x4， 如果是，调用rgb_control控制RGB灯改变颜色。
三、运行 手机上运行该APP
搜索到BLE，并连接
将uuid改为和配置一致
进入界面后，可以操作了。
操作后串口输出：