使用i2c读取HS3003温湿度传感器的值,并串口打印结果。
一、串口的配置
1.1、选择SWD下载模式
创建的开发板项目工程,默认是JTAG编程模式,占用CH340的调试。
1.2、配置调试串口
调试串口的硬件部分电路
配置串口端口
设置波特率、回调函数和端口
二、i2c配置
配置i2c3
三、程序
3.1、串口部分程序
#include "hal_data.h"
#include <stdio.h>
volatile bool uart_send_complete_flag = false;
void init_uart(void)
{
fsp_err_t err = FSP_SUCCESS;
err = R_SCI_UART_Open (&uart9_ctrl, &uart9_cfg);
assert(FSP_SUCCESS == err);
}
void uart9_callback(uart_callback_args_t *p_args)
{
switch(p_args->event)
{
case UART_EVENT_RX_CHAR:
R_SCI_UART_Write(&uart9_ctrl, (uint8_t *)&(p_args->data),1);
break;
case UART_EVENT_TX_COMPLETE:
uart_send_complete_flag=true;
break;
default:
break;
}
}
int fputc(int ch, FILE *f)
{
(void)f;
R_SCI_UART_Write(&uart9_ctrl, (uint8_t *)&ch, 1);
while(uart_send_complete_flag == false);
uart_send_complete_flag = false;
return ch;
}
3.2、主程序
#include "hal_data.h"
#include "uart.h"
#include "stdio.h"
void R_BSP_WarmStart(bsp_warm_start_event_t event);
float RH=0.0,TEMP=0.0;
uint8_t buf[4]={0};
void i2c3_callback(i2c_master_callback_args_t * p_args)
{
}
void hal_entry (void)
{
init_uart();
R_SCI_I2C_Open(&i2c3_ctrl, &i2c3_cfg);
while (1)
{
buf[0] = buf[1] = buf[2] = buf[3] = 0;
R_SCI_I2C_Write(&i2c3_ctrl, buf, 4,false);
R_BSP_SoftwareDelay(10,BSP_DELAY_UNITS_MICROSECONDS);
R_SCI_I2C_Read(&i2c3_ctrl, buf, 4,false);
R_BSP_SoftwareDelay(100, BSP_DELAY_UNITS_MILLISECONDS);
RH =(float)(((short)(buf[0] & 0x3f)<< 8)+ buf[1])/ 16383 * 100;
TEMP =(float)((((short)buf[2]<<8)+buf[3])>> 2)/16383 *165 - 40;
printf("RH: %f , temp: %f\r\n",RH,TEMP);
R_BSP_SoftwareDelay(200, BSP_DELAY_UNITS_MILLISECONDS);
}
}
四、运行
串口输出
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