Hangxin ACM32G103 Development Board Evaluation 07 LVGL Temperature and Humidity Environmental Data Display

みずじ

Hangxin ACM32G103 Development Board Evaluation 07 LVGL Temperature and Humidity Environmental Data Display [Copy link]

<i class="pstatus">This post was last edited by みずじ on 2024-1-25 17:48</i> # Hangxin ACM32G103 Development Board Evaluation 07 LVGL Temperature and Humidity Environmental Data Display## Reference transplantation tutorial https://en.eeworld.com/bbs/thread-1270136-1-1.html https://en.eeworld.com/bbs/thread-1270761-1-1.html ## Software and hardware platform 1. Hangxin ACM32G103 development board 2. 1.28-inch round color TFT display HD IPS module 240X240 SPI interface GC9A01 driver chip 3. DHT11 temperature and humidity sensor 4. LVGL V8.3.1 source code ### DHT11 temperature and humidity sensor DHT11 is a temperature and humidity sensor with calibrated digital signal output. Precision humidity +-5%RH, temperature +-2℃, range humidity 20-90%RH, temperature 0~50℃. For more information about DHT11, please refer to: https://baike.sogou.com/v73984313.htm?fromTitle=DHT11 The following figure is the pin description of DHT11, and the DATA pin is the signal input and output. DS18B20 Pin Description 
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 ### DHT11 Single Bus Sensor Driver DHT11 The overall working sequence is: the host sends a start signal, the DHT11 responds to the output, the host receives 40bit data (humidity data + temperature data + check value), and the end signal (optional). The specific process is as follows: 1. The bus idle state is high, the host pulls the bus low and waits for DHT11 to respond. The host must pull the bus low for more than 18ms to ensure that DHT11 can detect the start signal; 2. After the host sends the start signal, it pulls the bus level high and waits for 20-40us before reading the response signal of DHT11; 3. After DHT11 receives the start signal from the host, it waits for the microprocessor start signal to end and sends a 80us low-level response signal; 4. DHT11 sends a 80us high level to prepare to send data; 5. DHT11 sends 40bit data (humidity data + temperature data + checksum). 
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 #### Start and response signal The host pulls the bus low for at least 18ms, then pulls the bus high, delays 20~40us, and the start signal (sometimes also called reset signal) is sent. After DHT11 detects the reset signal, it triggers a sampling and pulls down the bus for 80us to indicate the response signal, telling the host that the data is ready. DHT11 then pulls up the bus for 80us and starts to transmit data. If the response signal is detected to be high, the DHT11 initialization fails. Please check whether the line is connected normally. 
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 ### Reading timing DHT11 starts to transmit data. Each 1bit of data starts with a 50us low level, telling the host to start transmitting a bit of data. DHT11 defines whether the data bit is 0 or 1 by the length of the high level: after 50us of low level, the bus is pulled up, and the high level lasts for 26~28us to indicate 0, and the high level lasts for 70us to indicate data 1. When the last 1bit of data is transmitted, DHT11 pulls down the bus for 50us, indicating that the data transmission is complete, and then the bus is pulled up by the pull-up resistor to enter the idle state. The way to represent bit data 0 is: it starts with a low level of 50us, and the high level lasts for 26~28us to represent 0. 
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 The way to represent bit data 1 is: it starts with a low level of 50us, and the high level lasts for 70us to represent 1. 
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 ### Driver code 1. Port initialization ```c /* * Function name: DHT11_GPIO_Config * Description: Configure the I/O port used by DHT11 * Input: None * Output: None */ static void DHT11_GPIO_Config ( void ) { GPIO_InitTypeDef GPIO_InitStruct; /* Enable the GPIO Clock */ DHT11_GPIO_CLK_ENABLE(); GPIO_InitStruct.Pin = DHT11_Dout_GPIO_PIN; GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP; GPIO_InitStruct.Pull = GPIO_PULLUP; GPIO_InitStruct.Drive = GPIO_DRIVE_LEVEL3; GPIO_InitStruct.Alternate = GPIO_FUNCTION_0; HAL_GPIO_Init(DHT11_Dout_GPIO_PORT, &GPIO_InitStruct); } /** * @brief DHT11 initialization function * @param None * @retval None */ void DHT11_Init ( void ) { DHT11_GPIO_Config (); DHT11_Dout_1; // Pull up the DHT11 data pin } /* * Function name: DHT11_Mode_IPU * Description: Make the DHT11-DATA pin into pull-up input mode * Input: None * Output: None */ static void DHT11_Mode_IPU(void) { GPIO_InitTypeDef GPIO_InitStruct; DHT11_GPIO_CLK_ENABLE(); GPIO_InitStruct.Pin = DHT11_Dout_GPIO_PIN; GPIO_InitStruct.Mode = GPIO_MODE_INPUT; GPIO_InitStruct.Pull = GPIO_PULLUP; GPIO_InitStruct.Drive = GPIO_DRIVE_LEVEL3; GPIO_InitStruct.Alternate = GPIO_FUNCTION_0; HAL_GPIO_Init(DHT11_Dout_GPIO_PORT, &GPIO_InitStruct); } /* * Function Name: DHT11_Mode_Out_PP * Description: Make the DHT11-DATA pin into push-pull output mode * Input: None * Output: None */ static void DHT11_Mode_Out_PP(void) { GPIO_InitTypeDef GPIO_InitStruct; DHT11_GPIO_CLK_ENABLE(); GPIO_InitStruct.Pin = DHT11_Dout_GPIO_PIN; GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP ; GPIO_InitStruct.Pull = GPIO_PULLUP; GPIO_InitStruct.Drive = GPIO_DRIVE_LEVEL3; GPIO_InitStruct.Alternate = GPIO_FUNCTION_0; HAL_GPIO_Init(DHT11_Dout_GPIO_PORT, &GPIO_InitStruct); } ``` 2. Read a byte from DHT11```c static uint8_t DHT11_ReadByte ( void ) { uint8_t i, temp=0; for(i=0;i<8;i++) { /*Each bit starts with a 50us low level mark, polling until the 50us low level sent by the slave ends*/ while(DHT11_Dout_IN()==Bit_RESET); /*DHT11 uses 26~28us high level to represent "0", and 70us high level to represent "1". *By detecting the level after x us, we can distinguish these two states, x means the delay below*/ HAL_DelayUs(40); //Delay x us This delay needs to be greater than the duration of data 0 if(DHT11_Dout_IN()==Bit_SET)/* After x us, it is still high level to represent data "1" */ { /* Wait for the high level of data 1 to end*/ while(DHT11_Dout_IN()==Bit_SET); temp|=(uint8_t)(0x01<<(7-i)); //Set the 7-i position to 1, MSB first} else // After x us, it is low level to represent data "0" { temp&=(uint8_t)~(0x01<<(7-i)); //Set the 7-i position to 0, MSB first} } return temp; } ``` 3. Temperature and humidity data acquisition function```c /* * A complete data transmission is 40 bits, with the highest bit out first* 8bit humidity integer + 8bit humidity decimal + 8bit temperature integer + 8bit temperature decimal + 8bit checksum*/ uint8_t DHT11_Read_TempAndHumidity(DHT11_Data_TypeDef *DHT11_Data) { /*Output mode*/ DHT11_Mode_Out_PP(); /*Host pulls low*/ DHT11_Dout_0; /*Delay 18ms*/ HAL_DelayMs(18); /*Bus pulls high and host delays 30us*/ DHT11_Dout_1; HAL_DelayUs(30); //Delay 30us /*Host is set as input to determine the response signal of the slave*/ DHT11_Mode_IPU(); /*Judge whether the slave has a low-level response signal. If not, jump out. If it responds, run downward*/ if(DHT11_Dout_IN()==Bit_RESET) { /*Polling until the 80us low-level response signal from the slave ends*/ while(DHT11_Dout_IN()==Bit_RESET); /*Polling until the 80us high-level mark signal from the slave ends*/ while(DHT11_Dout_IN()==Bit_SET); /*Start receiving data*/ DHT11_Data->humi_int= DHT11_ReadByte(); DHT11_Data->humi_deci= DHT11_ReadByte(); DHT11_Data->temp_int= DHT11_ReadByte(); DHT11_Data->temp_deci= DHT11_ReadByte(); DHT11_Data->check_sum= DHT11_ReadByte(); /*Reading is completed, the pin is changed to output mode*/ DHT11_Mode_Out_PP(); /*Host pulls high*/ DHT11_Dout_1; /*Check if the read data is correct*/ if(DHT11_Data->check_sum == DHT11_Data->humi_int + DHT11_Data->humi_deci + DHT11_Data->temp_int+ DHT11_Data->temp_deci) return SUCCESS; else return ERROR; } else return ERROR; } ``` 4. bsp_dht11.h ```c #ifndef __BSP_DHT11_H #define __BSP_DHT11_H #include "main.h" typedef struct { uint8_t humi_int; //Integer part of humidity uint8_t humi_deci; //Decimal part of humidity uint8_t temp_int; //Integer part of temperature uint8_t temp_deci; //Fractional part of temperature uint8_t check_sum; //Checksum}DHT11_Data_TypeDef; #define Bit_RESET 0 #define Bit_SET 1 #define DHT11_Dout_GPIO_PORT GPIOC #define DHT11_Dout_GPIO_PIN GPIO_PIN_5 #define DHT11_GPIO_CLK_ENABLE() __HAL_RCC_GPIOC_ CLK_ENABLE() #define DHT11_Dout_0 HAL_GPIO_WritePin(DHT11_Dout_GPIO_PORT,DHT11_Dout_GPIO_PIN,GPIO_PIN_RESET)
#define DHT11_Dout_1            HAL_GPIO_WritePin(DHT11_Dout_GPIO_PORT,DHT11_Dout_GPIO_PIN,GPIO_PIN_SET)
#define DHT11_Dout_IN()         HAL_GPIO_ReadPin( DHT11_Dout_GPIO_PORT, DHT11_Dout_GPIO_PIN )

static void DHT11_GPIO_Config ( void );
void DHT11_Init ( void );
uint8_t DHT11_Read_TempAndHumidity ( DHT11_Data_TypeDef * DHT11_Data );

#endif

```

### 案例测试
1. 主函数

```c

/******************************************************************************
*<a href="https://en.eeworld.com/bbs/home.php?mod=space&uid=1307177" target="_blank">@File</a>  : main.c
*@brief : main program
******************************************************************************/
#include "main.h"

#include "lvgl_timer.h"
LoopFunction loopFunction[MAX_INIT_FUNCTIONS];
int loopFunctionCount = 0;

void callInitFunctions(void){
	uint8_t i ;
	for(i = 0 ; i<loopfunctioncount :="" a="" after="" and="" attach="" bsp_uart_init="" btn="lv_btn_create(scr);" btn1="lv_btn_create(scr);" btn2="lv_btn_create(scr);" button="" chart="" create="" data="" dht11="" dht11_data="" dht11_data.humi_int="" dht11_data_typedef="" dht11_init="" dht11_read_tempandhumidity="" direct="" div="" eeworld="" else="" end="" error="" for="" hal_delay="" hal_init="" humidity="" if="" int="" int8_t="" labe_humi="lv_label_create(lv_scr_act());" labe_temp="lv_label_create(lv_scr_act());" label="" label1="lv_label_create(btn1);" label2="lv_label_create(btn2);" lines="" loopfunction="" lv_align_center="" lv_chart_axis_primary_y="" lv_chart_refresh="" lv_chart_series_t="" lv_chart_set_next_value="" lv_chart_set_type="" lv_chart_type_line="" lv_demo_widgets="" lv_ex_label_1="" lv_example_chart_1="" lv_example_style_1="" lv_init="" lv_label_set_text="" lv_label_set_text_fmt="" lv_obj_align="" lv_obj_center="" lv_obj_set_size="" lv_obj_set_style_bg_color="" lv_obj_t="" lv_palette_main="" lv_port_disp_init="" lv_scr_load="" lv_task_handler="" lvgl="" main="" next="" none="" null="" on="" points="" printf="" printfs="" program="" rtc_init="" scr="lv_obj_create(NULL);" screen="" ser1="" series="" set="" simple="" static="" success="" systemclock_config="" temperature="" testing="" the="" tim6_init="" too="" two="" void="" while="">
<div class="trtext" f="subject_1270856">Hangxin ACM32G103 Development Board Evaluation 07 LVGL Temperature and Humidity Environmental Data Display</div>
<input id="trid" type="hidden" value="0"/>
</loopfunctioncount>