【MAX32660试用体验】DHT11

ti

测试了下LP中的DeepSleep，代码如下

LP_EnableGPIOWakeup((gpio_cfg_t*)&pb_pin[0]);printf("EnableGPIOWakeup .n");
MXC_GCR->scon |= 0x4000; // Disable SWD
printf("Entering DEEPSLEEP mode.n");
LP_DisableBandGap();
LP_DisableVCorePORSignal();
LP_EnableRamRetReg();
LP_DisableBlockDetect();
LP_EnableFastWk();
LP_EnterDeepSleepMode();
MXC_GCR->scon &= 0xBFFF; // Enable SWD
printf("Entering not DEEPSLEEP mode.n");
rDeepSleepMode=0;

复制代码

进入和出SLEEP同时出现，没成功。

准备进行与DHT11湿度传感器连接的工作。

/***** Includes *****/
#include
#include
#include "mxc_config.h"
#include "nvic_table.h"
#include "board.h"
#include "rtc.h"
#include "led.h"
#include "pb.h"
#include "tmr_utils.h"
#include "gpio.h"
#include "lp.h"
#include "icc.h"
#include "uart.h"
/***** Definitions *****/
#define LED_ALARM 0
#define SUBSECOND_MSEC_0 250
#define SECS_PER_MIN 60
#define SECS_PER_HR (60 * SECS_PER_MIN)
#define SECS_PER_DAY (24 * SECS_PER_HR)
#define MSEC_TO_RSSA(x) (0 - ((x * 256) / 1000)) /* Converts a time in milleseconds to the equivalent RSSA register value. */
#define DEEPSLEEP 1
/*LED Control PIN red*/
#define GPIO_PORT_OUT PORT_0
#define GPIO_PIN_OUT PIN_9
/*DHT11 Control PIN */
#define GPIO_PIN_OUT2 PIN_4
/***** Globals *****/
uint32_t ss_interval = SUBSECOND_MSEC_0;
volatile int buttonPressed = 0;
volatile int rtcalarm = 0;
volatile int rDeepSleepMode = 0;
gpio_cfg_t dht_in = {PORT_0, GPIO_PIN_OUT2, GPIO_FUNC_IN, GPIO_PAD_NONE};
/***** Functions *****/
void MicroSeconds(int us) {
/* Demonstrates the TMR driver delay */
// TMR_Delay(MXC_TMR0, USEC(us), NULL); // todo check if this is µsec or msec
uint32_t i = 0;
for( i=0; i < us * 4; i++) {
asm(" nop");
}
}
void RTC_IRQHandler(void)
{
int flags = RTC_GetFlags();
rtcalarm = 1;
/* Check sub-second alarm flag. */
if (flags & MXC_F_RTC_CTRL_ALSF) {
RTC_ClearFlags(MXC_F_RTC_CTRL_ALSF);
}
/* Check time-of-day alarm flag. */
if (flags & MXC_F_RTC_CTRL_ALDF) {
RTC_ClearFlags(MXC_F_RTC_CTRL_ALDF);
/* Set a new alarm 10 seconds from current time. */
}
}
void buttonHandler(void *pb)
{
buttonPressed = 1;
}
/*从DHT11读取一个位，返回值：1/0。
每一bit数据都以50us的低电平时序开始，高电平的宽度决定了bit数据位的0或1，
高电平状态在26~28us时，表示数据位为0，高电平状态在70us时，表示数据位为1.
DHT11_DQ_IN是读取对应端口引脚的输入电平，在读之前，该引脚要配置为上拉下拉输入模式
*/
char DHT11_Read_Bit(void)
{
char retry=0;
while(GPIO_InGet(&dht_in)&&retry<100)//读取高电平中，等待变为低电平，/*&&与 <的优先级是<高于&&*
{
retry++;
MicroSeconds(1);//SysTickDelay(1);
}
retry=0;
while(!GPIO_InGet(&dht_in)&&retry<100)//读取低电平中，等待变高电平
{
retry++;
MicroSeconds( 1);//SysTickDelay(1);
}
MicroSeconds( 40);//SysTickDelay(40);//等待40us
if(GPIO_InGet(&dht_in))return 1;
else return 0;
}
char DhtReadByte(void)
{
char j,dat;
dat=0;
for(j=0;j<8;j++)
{
/*while (!GPIO_InGet(&dht_in)); // 等待低电平结束
MicroSeconds(uint32_t 25); // 延时 Delay25us
if(GPIO_InGet(&dht_in)) // 检测数据线是高电平还是低电平
{ bit_i=1; while(TRH); }
else { bit_i=0; }
dat<<=1; // 将该位移位保存到dat变量中
dat|=bit_i; */
dat<<=1;
dat|=DHT11_Read_Bit();
}
return(dat); }
void printTime(void)
{
int day, hr, min, sec;
double subsec;
subsec = RTC_GetSubSecond() / 256.0;
sec = RTC_GetSecond();
day = sec / SECS_PER_DAY;
sec -= day * SECS_PER_DAY;
hr = sec / SECS_PER_HR;
sec -= hr * SECS_PER_HR;
min = sec / SECS_PER_MIN;
sec -= min * SECS_PER_MIN;
subsec += sec;
printf("Current Time (dd:hh:mm:ss): %02d:%02d:%02d:%05.2fn", day, hr, min, subsec);
}
int main(void)
{
const sys_cfg_tmr_t sys_tmr_cfg = {0}; // Do not enable timer output.
//sys_cfg_rtc_t sys_cfg;
gpio_cfg_t gpio_out0;
/* Setup output pin FOR led. */
gpio_out0.port = GPIO_PORT_OUT;
gpio_out0.mask = GPIO_PIN_OUT;
gpio_out0.pad = GPIO_PAD_NONE;
gpio_out0.func = GPIO_FUNC_OUT;
GPIO_Config(&gpio_out0);
gpio_cfg_t dht_in = {PORT_0, GPIO_PIN_OUT2, GPIO_FUNC_IN, GPIO_PAD_NONE};
gpio_cfg_t dht_out = {PORT_0, GPIO_PIN_OUT2, GPIO_FUNC_OUT, GPIO_PAD_NONE};
/*
gpio_cfg_t dht_in = {PORT_0, GPIO_PIN_OUT2, GPIO_FUNC_IN, GPIO_PAD_NONE};
gpio_cfg_t dht_out = {PORT_0, GPIO_PIN_OUT2, GPIO_FUNC_OUT, GPIO_PAD_NONE};
gpio_cfg_t d0 = {PORT_0, PIN_2, GPIO_FUNC_OUT, GPIO_PAD_NONE};
gpio_cfg_t d1 = {PORT_0, PIN_3, GPIO_FUNC_OUT, GPIO_PAD_NONE};
gpio_cfg_t d2 = {PORT_0, PIN_4, GPIO_FUNC_OUT, GPIO_PAD_NONE};
gpio_cfg_t d3 = {PORT_0, PIN_5, GPIO_FUNC_OUT, GPIO_PAD_NONE}; */
int count = 0;
printf("nn***** DHT11 on P0.4 ******nn");
printf(
"1. An interrupt is set up on P0.12. when that interrupt occurs.using a push button (S1) to start DHT11nn");
printf("2. This example outputs the same state onto P0.9 (led_R) and outputs the same state onto P0.13 (led_G).nn");
printf("3.space led_G Init led_R 15s DATA_IN led_Y %d ms.n", SUBSECOND_MSEC_0);
NVIC_EnableIRQ(RTC_IRQn);
// Setup callback to receive notification of when button is pressed.
PB_RegisterCallback(0, buttonHandler);
// Turn LED off initially
GPIO_OutClr(&gpio_out0);
LED_Off(LED_ALARM);
TMR_Delay(MXC_TMR0, MSEC(1000), &sys_tmr_cfg);
int i=0;
while (1) {
if (buttonPressed) {
// Show the time elapsed.
printTime();
// Delay for switch debouncing.
TMR_Delay(MXC_TMR0, MSEC(100), &sys_tmr_cfg);
printf("buttonPressed count = %dn", count++);
// Re-arm switch detection.
i++;
buttonPressed = 0;
char check; // 校验字节
char TemHig,TemLow,HumiHig,HumiLow;
GPIO_Config(&dht_out);
GPIO_OutClr(&dht_out);
// 主机拉低18ms DelayMs(18);
TMR_Delay(MXC_TMR0, MSEC(18), &sys_tmr_cfg);
GPIO_OutSet(&dht_out); // DATA总线由上拉电阻拉高主机延时20us
MicroSeconds( 20);
GPIO_Config(&dht_in); // 主机设为输入
TMR_Delay(MXC_TMR0, MSEC(15000), &sys_tmr_cfg); // 主机延时15s
GPIO_Config(&dht_out);
GPIO_OutClr(&dht_out);
// 主机拉低18ms DelayMs(18);
TMR_Delay(MXC_TMR0, MSEC(18), &sys_tmr_cfg);
GPIO_OutSet(&dht_out); // DATA总线由上拉电阻拉高主机延时20us
MicroSeconds( 20);
GPIO_Config(&dht_in); // 主机设为输入
while (!GPIO_InGet(&dht_in)); // 等待DHT 80us的低电平结束
while (GPIO_InGet(&dht_in)); // 等待DHT 80us的高电平结束
HumiHig = DhtReadByte(); // 湿度高8位
HumiLow = DhtReadByte(); // 湿度低8为，总为0
TemHig = DhtReadByte(); // 温度高8位
TemLow = DhtReadByte(); // 温度低8为，总为0
check = DhtReadByte(); // 8位校验码，其值等于读出的四个字节相加之和的低8位
//TRH=1; // 释放总线
if(check==HumiHig + HumiLow + TemHig + TemLow) // 如果收到的数据无误
{printf("HumiHig = %d. %dn", HumiHig,HumiLow);
printf("TemHig = %d. %dn", TemHig,TemLow);
printf("check = %dn", check);}
}
}
}

复制代码

检测运行成功

李东乾 · 2019-3-29 15:45:15

感谢楼主的热心分享

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【MAX32660试用体验】DHT11

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