二、工作原理

通過串口讀取傳感器數值解釋完后，顯示到數碼管，數碼管顯示方式為動態掃描
程序分為2個線程，一個數據解釋線程，一個數碼管掃描顯示線程

三、硬件連接

四、rt-thread studio驅動配置

打開UART0

五、RA Smart Configurator配置

添加g_uart0 UART驅動

配置SC0為異步串口，選擇101 100引腳

六、代碼編寫

PM2.5 接收及解釋

#include
#include
#include
#include "display.h"
#define DBG_TAG "app.pm25"
#define DBG_LVL DBG_LOG
#include
static rt_device_t serial;
static pm25_state_t pm25_state;
uint16_t pm25_data_convert(uint8_t h, uint8_t l)
{
return h<<8|l;
}
void pm25_thread_entry(void parameter)
{
uint8_t ch;
serial = rt_device_find("uart0");
if (!serial)
{
LOG_E("find %s failed!n", "uart1");
return;
}
else{
struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT; / 初始化配置參數 /
/ step2：修改串口配置參數 /
config.baud_rate = BAUD_RATE_9600; //修改波特率為 9600
config.data_bits = DATA_BITS_8; //數據位 8
config.stop_bits = STOP_BITS_1; //停止位 1
config.tx_bufsz = 0; //修改緩沖區 buff size 為 128
config.rx_bufsz = 128; //修改緩沖區 buff size 為 128
config.parity = PARITY_NONE; //無奇偶校驗位
/ step3：控制串口設備。通過控制接口傳入命令控制字，與控制參數 */
rt_device_control(serial, RT_DEVICE_CTRL_CONFIG, &config);
rt_device_open(serial, RT_DEVICE_FLAG_RX_NON_BLOCKING | RT_DEVICE_FLAG_TX_BLOCKING);
}
while(1){
// rt_thread_delay(10);
if( rt_device_read(serial, -1, &ch, 1) > 0 ){
pm25_state.recv_time = 10;
switch( pm25_state.recv_state )
{
case RECV_START1:
if( ch==0x42 ){
pm25_state.recv_state++;
pm25_state.recv_buf[pm25_state.recv_index++] = ch;
}
break;
case RECV_START2:
if( ch==0x4d ){
pm25_state.recv_state++;
pm25_state.recv_buf[pm25_state.recv_index++] = ch;
}
break;
case RECV_LEN1:
pm25_state.recv_state++;
pm25_state.recv_buf[pm25_state.recv_index++] = ch;
pm25_state.recv_len = ch<<8;
break;
case RECV_LEN2:
pm25_state.recv_state++;
pm25_state.recv_buf[pm25_state.recv_index++] = ch;
pm25_state.recv_len |= ch;
break;
case RECV_DATA:
if( pm25_state.recv_index < pm25_state.recv_len ){
pm25_state.recv_buf[pm25_state.recv_index++] = ch;
if( pm25_state.recv_index == pm25_state.recv_len ){
pm25_state.recv_state++;
}
}
break;
case RECV_END:
// LOG_HEX("REPLY", 16, pm25_state.recv_buf, 32);
pm25_state.recv_state = 0;
pm25_state.recv_index = 0;
pm25_decode_t *pm25_decode_ptr = (pm25_decode_t *)pm25_state.recv_buf;
pm25_state.pm25_data.pm1_0 = pm25_data_convert(pm25_decode_ptr->pm1_0_h,pm25_decode_ptr->pm1_0_l);
pm25_state.pm25_data.pm2_5 = pm25_data_convert(pm25_decode_ptr->pm2_5_h,pm25_decode_ptr->pm2_5_l);
pm25_state.pm25_data.pm10 = pm25_data_convert(pm25_decode_ptr->pm10_h,pm25_decode_ptr->pm10_l);
pm25_state.pm25_data.pm1_0_air = pm25_data_convert(pm25_decode_ptr->pm1_0_air_h,pm25_decode_ptr->pm1_0_air_l);
pm25_state.pm25_data.pm2_5_air = pm25_data_convert(pm25_decode_ptr->pm2_5_air_h,pm25_decode_ptr->pm2_5_air_l);
pm25_state.pm25_data.pm10_air = pm25_data_convert(pm25_decode_ptr->pm10_air_h,pm25_decode_ptr->pm10_air_l);
pm25_state.pm25_data.quantity_0_3 = pm25_data_convert(pm25_decode_ptr->quantity_0_3_h,pm25_decode_ptr->quantity_0_3_l);
pm25_state.pm25_data.quantity_0_5 = pm25_data_convert(pm25_decode_ptr->quantity_0_5_h,pm25_decode_ptr->quantity_0_5_l);
pm25_state.pm25_data.quantity_1_0 = pm25_data_convert(pm25_decode_ptr->quantity_1_0_h,pm25_decode_ptr->quantity_1_0_l);
pm25_state.pm25_data.quantity_2_5 = pm25_data_convert(pm25_decode_ptr->quantity_2_5_h,pm25_decode_ptr->quantity_2_5_l);
pm25_state.pm25_data.quantity_5_0 = pm25_data_convert(pm25_decode_ptr->quantity_5_0_h,pm25_decode_ptr->quantity_5_0_l);
pm25_state.pm25_data.quantity_10 = pm25_data_convert(pm25_decode_ptr->quantity_10_h,pm25_decode_ptr->quantity_10_l);
pm25_state.pm25_data.version = pm25_decode_ptr->version;
pm25_state.pm25_data.err_code = pm25_decode_ptr->err_code;
display_dig(pm25_state.pm25_data.pm2_5_air);
//
// LOG_D("pm1_0 = %d",pm25_state.pm25_data.pm1_0);
// LOG_D("pm2_5 = %d",pm25_state.pm25_data.pm2_5);
// LOG_D("pm10 = %d",pm25_state.pm25_data.pm10);
//
// LOG_D("pm1_0_air = %d",pm25_state.pm25_data.pm1_0_air);
// LOG_D("pm2_5_air = %d",pm25_state.pm25_data.pm2_5_air);
// LOG_D("pm10_air = %d",pm25_state.pm25_data.pm10_air);
//
// LOG_D("quantity_0_3 = %d",pm25_state.pm25_data.quantity_0_3);
// LOG_D("quantity_0_5 = %d",pm25_state.pm25_data.quantity_0_5);
// LOG_D("quantity_1_3 = %d",pm25_state.pm25_data.quantity_1_0);
// LOG_D("quantity_2_5 = %d",pm25_state.pm25_data.quantity_2_5);
// LOG_D("quantity_5_0 = %d",pm25_state.pm25_data.quantity_5_0);
// LOG_D("quantity_10 = %d",pm25_state.pm25_data.quantity_10);
// LOG_D("n");
break;
default:
break;
}
if( pm25_state.recv_time > 0 ){
pm25_state.recv_time --;
if( pm25_state.recv_time==0 ){
pm25_state.recv_state = RECV_START1;
pm25_state.recv_index = 0;
LOG_E("recv timeout");
}
}
}
// rt_device_write(serial, 0,"hello world",11);
rt_thread_delay(10);
}
}
void pm25_init(void)
{
rt_thread_t tid1 = RT_NULL;
tid1 = rt_thread_create("pm25",
pm25_thread_entry, RT_NULL,
512,
10, 10);
if (tid1 != RT_NULL)
rt_thread_startup(tid1);
}
INIT_APP_EXPORT(pm25_init);

595動態掃描顯示線程

/*

Copyright (c) 2006-2021, RT-Thread Development Team

SPDX-License-Identifier: Apache-2.0

Change Logs:
Date Author Notes
2023-02-18 dmjku the first version
*/
#include
#include
#include "display.h"
disp_buf_t disp_buf;
#define SERIAL_RCLK_PIN "P302"
#define SERIAL_SCLK_PIN "P303"
#define SERIAL_DIO_PIN "P301"
rt_uint32_t rclk_pin;
rt_uint32_t sclk_pin;
rt_uint32_t dio_pin;
#define serial_rclk_pin(sta) rt_pin_write(rclk_pin, sta)
#define serial_sclk_pin(sta) rt_pin_write(sclk_pin, sta)
#define serial_dio_pin(sta) rt_pin_write(dio_pin, sta)
const uint8_t dig_code[]={
/ 生成 0-f 的編碼 /
0xC0,////0
0xF9,////1
0xA4,////2
0xB0,////3
0x99,////4
0x92,////5
0x82,////6
0xF8,////7
0x80,////8
0x90,////9
0x88,////A
0x80,////B
0xC6,////C
0xC0,////D
0x86,////E
0x8E,////F
};
void display_dig(uint16_t dig)
{
uint8_t zero=0;
if( dig/1000 ){
disp_buf.dig[0] = dig_code[dig/1000];
dig %= 1000;
zero = 1;
}
else{
disp_buf.dig[0] = 0xff;
}
if( dig/100 ){
disp_buf.dig[1] = dig_code[dig/100];
dig %= 100;
zero = 1;
}
else if(zero){
disp_buf.dig[1] = dig_code[0];
}
else{
disp_buf.dig[1] = 0xff;
}
if( dig/10 ){
disp_buf.dig[2] = dig_code[dig/10];
dig %= 10;
zero = 1;
}
else if(zero){
disp_buf.dig[2] = dig_code[0];
}
else{
disp_buf.dig[2] = 0xff;
}
if( dig ){
disp_buf.dig[3] = dig_code[dig];
}
else if(zero){
disp_buf.dig[3] = dig_code[0];
}
else{
disp_buf.dig[3] = 0xff;
}
}
void display_led(void)
{
const uint8_t pos_v[] = {0x08,0x04,0x02,0x01};
static uint8_t pos = 0;
disp_buf.output[0] = pos_v[pos];
disp_buf.output[1] = disp_buf.dig[pos];
pos++;
if( pos>=4 )
pos = 0;
}
static void display_wr_byte(uint8_t data)
{
for( uint8_t i=0; i<8; i++ ){
serial_dio_pin(data&0x80?1:0);
// rt_hw_us_delay(1);
serial_sclk_pin(1);
// rt_hw_us_delay(1);
serial_sclk_pin(0);
data <<= 1;
}
}
static void display_refresh(void)
{
for( uint8_t i=DISP_BUF_LEN; i>0; i-- ){
display_wr_byte(disp_buf.output[i-1]);
}
serial_rclk_pin(1);
// rt_hw_us_delay(1);
serial_rclk_pin(0);
}
void display_thread_entry(void *paramter)
{
display_dig(1);
while( 1 ){
display_led();
display_refresh();
rt_thread_delay(5);
}
}
void display_init(void)
{
rclk_pin = rt_pin_get(SERIAL_RCLK_PIN);
sclk_pin = rt_pin_get(SERIAL_SCLK_PIN);
dio_pin = rt_pin_get(SERIAL_DIO_PIN);
// serial_rclk_pin(1);
// serial_rclk_pin(0);
// serial_sclk_pin(1);
// serial_sclk_pin(0);
// serial_dio_pin(1);
// serial_dio_pin(0);
rt_thread_t tid1 = RT_NULL;
tid1 = rt_thread_create("disp",
display_thread_entry, RT_NULL,
512,
10, 10);
if (tid1 != RT_NULL)
rt_thread_startup(tid1);
}
INIT_APP_EXPORT(display_init);

七、總結

第一次使用的瑞薩的ARM系列芯片，在RT-thread studio的加持下結合RA Smart Configurator，不需看硬件手冊，可以快速上手開發，真心好用，比keil+evn+stm32cubeMX還要順手