【AT-START-L021测评】+ SPI驱动ST7789 2.0寸屏幕显示温湿度
本帖最后由 xiaoqi976633690 于 2024-11-29 17:04 编辑#申请原创#
一、项目描述
1.项目介绍
项目基于AT-START-L021 V1.0开发板驱动SPI 屏幕显示温湿度信息和倒计时器。
2.设计思路
SPI驱动采用硬件SPI和软件模拟SPI（可选）默认硬件SPI，I2C采用软件模拟时序。
3.硬件
2.0寸ST7789屏幕+AHT20温湿度传感器
二、软件代码说明
1.SPI初始化
注意事项
a.注意SPI的复用mux
gpio_pin_mux_config(GPIOA, GPIO_PINS_SOURCE5, GPIO_MUX_0);
gpio_pin_mux_config(GPIOA, GPIO_PINS_SOURCE6, GPIO_MUX_0);
gpio_pin_mux_config(GPIOA, GPIO_PINS_SOURCE7, GPIO_MUX_0);b.注意SCK引脚内部下拉配置gpio_initstructure.gpio_pull = GPIO_PULL_DOWN;c.注意SPI模式的配置关键点：
1.spi_init_struct.mclk_freq_division = SPI_MCLK_DIV_2;//分频系数影响spi速率
2.spi_init_struct.first_bit_transmission = SPI_FIRST_BIT_MSB;//高位在前
3.spi_init_struct.clock_polarity = SPI_CLOCK_POLARITY_LOW;//clk空闲为低spi_init_struct.clock_phase = SPI_CLOCK_PHASE_1EDGE;//第一个边沿采样
void SPI1_config(void)
{
spi_init_type spi_init_struct;
gpio_init_type gpio_initstructure;
crm_periph_clock_enable(CRM_SPI1_PERIPH_CLOCK, TRUE);
crm_periph_clock_enable(CRM_GPIOA_PERIPH_CLOCK, TRUE);
crm_periph_clock_enable(CRM_GPIOB_PERIPH_CLOCK, TRUE);
gpio_default_para_init(&gpio_initstructure);
#ifdef SOFT_SPI
//SPI1_SCK
gpio_initstructure.gpio_out_type = GPIO_OUTPUT_PUSH_PULL;
gpio_initstructure.gpio_pull = GPIO_PULL_UP;
gpio_initstructure.gpio_mode = GPIO_MODE_OUTPUT;
gpio_initstructure.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;
gpio_initstructure.gpio_pins = GPIO_PINS_5;
gpio_init(GPIOA, &gpio_initstructure);
//SPI1_MOSI
gpio_initstructure.gpio_out_type = GPIO_OUTPUT_PUSH_PULL;
gpio_initstructure.gpio_pull = GPIO_PULL_UP;
gpio_initstructure.gpio_mode = GPIO_MODE_OUTPUT;
gpio_initstructure.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;
gpio_initstructure.gpio_pins = GPIO_PINS_7;
gpio_init(GPIOA, &gpio_initstructure);
#else
gpio_pin_mux_config(GPIOA, GPIO_PINS_SOURCE5, GPIO_MUX_0);
gpio_pin_mux_config(GPIOA, GPIO_PINS_SOURCE6, GPIO_MUX_0);
gpio_pin_mux_config(GPIOA, GPIO_PINS_SOURCE7, GPIO_MUX_0);
//SPI1_SCK
gpio_initstructure.gpio_out_type = GPIO_OUTPUT_PUSH_PULL;
gpio_initstructure.gpio_pull = GPIO_PULL_DOWN;
gpio_initstructure.gpio_mode = GPIO_MODE_MUX;
gpio_initstructure.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;
gpio_initstructure.gpio_pins = GPIO_PINS_5;
gpio_init(GPIOA, &gpio_initstructure);
//SPI1_MISO
gpio_initstructure.gpio_out_type = GPIO_OUTPUT_PUSH_PULL;
gpio_initstructure.gpio_pull = GPIO_PULL_UP;
gpio_initstructure.gpio_mode = GPIO_MODE_MUX;
gpio_initstructure.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;
gpio_initstructure.gpio_pins = GPIO_PINS_6;
gpio_init(GPIOA, &gpio_initstructure);
//SPI1_MOSI
gpio_initstructure.gpio_out_type = GPIO_OUTPUT_PUSH_PULL;
gpio_initstructure.gpio_pull = GPIO_PULL_UP;
gpio_initstructure.gpio_mode = GPIO_MODE_MUX;
gpio_initstructure.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;
gpio_initstructure.gpio_pins = GPIO_PINS_7;
gpio_init(GPIOA, &gpio_initstructure);
#endif
//CS
gpio_initstructure.gpio_out_type = GPIO_OUTPUT_PUSH_PULL;
gpio_initstructure.gpio_pull = GPIO_PULL_UP;
gpio_initstructure.gpio_mode = GPIO_MODE_OUTPUT;
gpio_initstructure.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;
gpio_initstructure.gpio_pins = GPIO_PINS_0;
gpio_init(GPIOB, &gpio_initstructure);
//DC
gpio_initstructure.gpio_out_type = GPIO_OUTPUT_PUSH_PULL;
gpio_initstructure.gpio_pull = GPIO_PULL_UP;
gpio_initstructure.gpio_mode = GPIO_MODE_OUTPUT;
gpio_initstructure.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;
gpio_initstructure.gpio_pins = GPIO_PINS_1;
gpio_init(GPIOB, &gpio_initstructure);
//RESET
gpio_initstructure.gpio_out_type = GPIO_OUTPUT_PUSH_PULL;
gpio_initstructure.gpio_pull = GPIO_PULL_UP;
gpio_initstructure.gpio_mode = GPIO_MODE_OUTPUT;
gpio_initstructure.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;
gpio_initstructure.gpio_pins = GPIO_PINS_2;
gpio_init(GPIOB, &gpio_initstructure);
//BLK
gpio_initstructure.gpio_out_type = GPIO_OUTPUT_PUSH_PULL;
gpio_initstructure.gpio_pull = GPIO_PULL_UP;
gpio_initstructure.gpio_mode = GPIO_MODE_OUTPUT;
gpio_initstructure.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;
gpio_initstructure.gpio_pins = GPIO_PINS_10;
gpio_init(GPIOB, &gpio_initstructure);
//LCD_SCLK_Clr();
// LCD_MOSI_Clr();
spi_default_para_init(&spi_init_struct);
spi_init_struct.transmission_mode = SPI_TRANSMIT_FULL_DUPLEX;
spi_init_struct.master_slave_mode = SPI_MODE_MASTER;
spi_init_struct.mclk_freq_division = SPI_MCLK_DIV_2;
spi_init_struct.first_bit_transmission = SPI_FIRST_BIT_MSB;
spi_init_struct.frame_bit_num = SPI_FRAME_8BIT;
spi_init_struct.clock_polarity = SPI_CLOCK_POLARITY_LOW;
spi_init_struct.clock_phase = SPI_CLOCK_PHASE_1EDGE;
spi_init_struct.cs_mode_selection = SPI_CS_SOFTWARE_MODE;
spi_init(SPI1, &spi_init_struct);
spi_enable(SPI1, TRUE);
LCD_DC_Set() ;
LCD_RES_Set();
LCD_CS_Set() ;
LCD_BLK_Set();
}
2.LCD读写函数和初始化
/******************************************************************************
函数说明：LCD串行数据写入函数
入口数据：dat要写入的串行数据
返回值：无
******************************************************************************/
uint8_t spi_writebyte(uint8_t index,uint8_t TxData)
{
uint8_t re;
while(spi_i2s_flag_get(SPI1, SPI_I2S_TDBE_FLAG) == RESET);
spi_i2s_data_transmit(SPI1, TxData);
while(spi_i2s_flag_get(SPI1, SPI_I2S_RDBF_FLAG) == RESET);
re = spi_i2s_data_receive(SPI1);
return re;
}
void LCD_Writ_Bus(u8 dat)
{
#ifdef SOFT_SPI
u8 i;
LCD_CS_Clr();
for(i=0;i<8;i++)
{
LCD_SCLK_Clr();
if(dat&0x80)
{
LCD_MOSI_Set();
}
else
{
LCD_MOSI_Clr();
}
LCD_SCLK_Set();
dat<<=1;
}
LCD_CS_Set();
#else
LCD_CS_Clr();
spi_writebyte(0,dat);
LCD_CS_Set();
#endif
}
至此SPI和屏幕驱动已基本完成。
3.软件i2c和AHT20驱动代码
a.软件I2C比较简单这里参考的是普中科技的代码，就不贴出来了。增加了个I2C 总线器件查找函数
void scan_iic(void)
{
u8 i=0,ack=1;
printf("iic scaner\n");
for(i=0;i<127;i=i+2)
{
IIC_Start();
IIC_Send_Byte(i);
ack=IIC_Wait_Ack();
if(ack==0) printf("0x%x",i>>1);
IIC_Stop();
}
printf("\n");
}
b.AHT20 温度读取函数
void read_AHT20(void)
{
uint8_t i;
for(i=0; i<6; i++)
{
readByte=0;
}
IIC_Start();//I2C启动
IIC_Send_Byte(0x71);//I2C写数据
ack_status = IIC_Wait_Ack();//收到的应答信息
readByte= IIC_Read_Byte(1);//I2C读取数据
readByte= IIC_Read_Byte(1);
readByte= IIC_Read_Byte(1);
readByte= IIC_Read_Byte(1);
readByte= IIC_Read_Byte(1);
readByte= IIC_Read_Byte(0);
IIC_Stop();//I2C停止函数
//判断读取到的第一个字节是不是0x08，0x08是该芯片读取流程中规定的，如果读取过程没有问题，就对读到的数据进行相应的处理
if( (readByte & 0x68) == 0x08 )
{
H1 = readByte;
H1 = (H1<<8) | readByte;
H1 = (H1<<8) | readByte;
H1 = H1>>4;
H1 = (H1*1000)/1024/1024;
T1 = readByte;
T1 = T1 & 0x0000000F;
T1 = (T1<<8) | readByte;
T1 = (T1<<8) | readByte;
T1 = (T1*2000)/1024/1024 - 500;
AHT20_OutData = (H1>>8) & 0x000000FF;
AHT20_OutData = H1 & 0x000000FF;
AHT20_OutData = (T1>>8) & 0x000000FF;
AHT20_OutData = T1 & 0x000000FF;
}
else
{
AHT20_OutData = 0xFF;
AHT20_OutData = 0xFF;
AHT20_OutData = 0xFF;
AHT20_OutData = 0xFF;
printf("读取失败！！！");
}
printf("\r\n");
//根据AHT20芯片中，温度和湿度的计算公式，得到最终的结果，通过串口显示
printf("温度:%d%d.%d",T1/100,(T1/10)%10,T1%10);
printf("湿度:%d%d.%d",H1/100,(H1/10)%10,H1%10);
if(T1<=180)
{
LCD_ShowString(10,0,"T:",DARKBLUE,WHITE,32,0);
LCD_ShowFloatNum1(44,0,(float)T1/10,4,DARKBLUE,WHITE,32);
LCD_ShowString(150+50,0,"H:",DARKBLUE,WHITE,32,0);
LCD_ShowFloatNum1(184+50,0,(float)H1/10,4,DARKBLUE,WHITE,32);
}
else if(T1>180&&T1<270)
{
LCD_ShowString(10,0,"T:",BRED,WHITE,32,0);
LCD_ShowFloatNum1(44,0,(float)T1/10,4,BRED,WHITE,32);
LCD_ShowString(150+50,0,"H:",BRED,WHITE,32,0);
LCD_ShowFloatNum1(184+50,0,(float)H1/10,4,BRED,WHITE,32);
}
printf("\r\n");
}
c.AHT20 子函数
voidread_AHT20_once(void)
{
delay_ms(10);
reset_AHT20();
delay_ms(10);
init_AHT20();
delay_ms(10);
startMeasure_AHT20();
delay_ms(80);
read_AHT20();
delay_ms(5);
}
voidreset_AHT20(void)
{
IIC_Start();
IIC_Send_Byte(0x70);
ack_status = IIC_Wait_Ack();
// if(ack_status) printf("1");
// else printf("1-n-");
IIC_Send_Byte(0xBA);
ack_status = IIC_Wait_Ack();
// if(ack_status) printf("2");
// else printf("2-n-");
IIC_Stop();
}
voidinit_AHT20(void)
{
IIC_Start();
IIC_Send_Byte(0x70);
ack_status = IIC_Wait_Ack();
// if(ack_status) printf("3");
// else printf("3-n-");
IIC_Send_Byte(0xE1);
ack_status = IIC_Wait_Ack();
// if(ack_status) printf("4");
// else printf("4-n-");
IIC_Send_Byte(0x08);
ack_status = IIC_Wait_Ack();
// if(ack_status) printf("5");
// else printf("5-n-");
IIC_Send_Byte(0x00);
ack_status = IIC_Wait_Ack();
// if(ack_status) printf("6");
// else printf("6-n-");
IIC_Stop();
}
voidstartMeasure_AHT20(void)
{
//------------
IIC_Start();
IIC_Send_Byte(0x70);
ack_status = IIC_Wait_Ack();
// if(ack_status) printf("7");
// else printf("7-n-");
IIC_Send_Byte(0xAC);
ack_status = IIC_Wait_Ack();
// if(ack_status) printf("8");
// else printf("8-n-");
IIC_Send_Byte(0x33);
ack_status = IIC_Wait_Ack();
// if(ack_status) printf("9");
// else printf("9-n-");
IIC_Send_Byte(0x00);
ack_status = IIC_Wait_Ack();
// if(ack_status) printf("10");
// else printf("10-n-");
IIC_Stop();
}
4.main函数int main(void)
{
// float t=0.01;
u8 m=30,s=59;
system_clock_config();
at32_board_init();
uart_print_init(115200);
IIC_Init();
SPI1_config();
LCD_Init();
LCD_Fill(0,0,LCD_H,LCD_W,WHITE);
// LCD_Show_MY_Char(10+65+65,45,10,my_color,WHITE,110,0);
scan_iic();
while(1)
{
s--;
if(m<=0)
{
m=30;
}
if(s<=0)
{
s=60;
m--;
}
LCD_Show_MY_Char(10,50,m/10%10,my_color,WHITE,110,0);
LCD_Show_MY_Char(10+65,50,m%10,my_color,WHITE,110,0);
LCD_Fill(148,85,168,105,my_color);
LCD_Fill(148,85+30,168,85+30+20,my_color);
LCD_Show_MY_Char(10+65+60+45,50,s/10%10,my_color,WHITE,110,0);
LCD_Show_MY_Char(10+65+60+60+50,50,s%10,my_color,WHITE,110,0);
LCD_ShowPicture(55,170,202,50,gImage_AT);
at32_led_toggle(LED4);
/// printf("%d\n",Read1307(0x00));
printf("UUID3=0x%x\n",UUID3);
delay_ms(500);
scan_iic();
read_AHT20_once();
}
}
三、演示效果
https://www.bilibili.com/video/BV1RFz6YkEwE/?buvid=XUFC3F1FA97B7BBFFC0CE7B8D943880538D96&is_story_h5=false&mid=3Cd1JxHUoNJxpuTd8p8AqA%3D%3D&plat_id=504&share_from=ugc&share_medium=android&share_plat=android&share_source=COPY&share_tag=s_i&spmid=dt.dt.0.0×tamp=1732871009&unique_k=WcPPDL9&up_id=27440139
页:
[1]