温湿度传感器DHT11驱动程序CC2530

/******************************************************************* * @file hal_dht11.c * @brief Temperature & Humidity Sensor Driver - DHT11 * * Copyright (c) 2017~2020 ShenZhen IoT-College Technology Co., Ltd. * All rights reserved. * * @version 1.0.0 * @author IoT-College <1805593021@qq.com> * @date 2017-12-11 13:18:22 * * @note 1. The official flagship store: * https://shop115377068.taobao.com * * 2. Blog: * *GitHub: https://github.com/IoT-College * *CSDN: https://blog.csdn.net/IoT_College * *StackOverflow: * https://stackoverflow.com/users/9555987/iot-college * * 3. QQ Communication group: * *Group 1: 575036716 * *Group 2: 684572410 * *Group 3: 587518203 *******************************************************************/ /******************************************************************* * Includes ******************************************************************* */ #include "hal_dht11.h" #include "CC2530_IoConfig.h" /******************************************************************* * Constant-Macros And Enumerations ******************************************************************* */ /** @brief DHT11 Boolean */ #define HAL_DHT11_FALSE 0 #define HAL_DHT11_TRUE 1 /** @brief DHT11 Status Code */ #define HAL_DHT11_SC_ERR HAL_DHT11_FALSE #define HAL_DHT11_SC_OK HAL_DHT11_TRUE #define HAL_DHT11_SC_HUMI_OUTOFRANGE 0xF1 #define HAL_DHT11_SC_TEMP_OUTOFRANGE 0xF2 #define HAL_DHT11_SC_HT_OUTOFRANGE 0xF3 /** @brief Delay Function * us, * ms */ #define HAL_DHT11_DELAY_US(x) delayUsIn32Mhz((x)) #define HAL_DHT11_DELAY_MS(x) delayMs(HAL_DELAY_32MHZ ,(x)) /** @brief Set DHT11 GPIO * output, * input */ #define HAL_DHT11_IO_OUTPUT() CC2530_GPIOMODE_CONFIG(HAL_DHT11_PORT, \ HAL_DHT11_PIN, \ CC2530_GPIO_OUTPUT) #define HAL_DHT11_IO_INPUT() CC2530_GPIOMODE_CONFIG(HAL_DHT11_PORT, \ HAL_DHT11_PIN, \ CC2530_GPIO_INPUT_PULLDOWN) /** @brief Set DHT11 GPIO Level * low-level, * high-level */ // set IO level #define HAL_DHT11_IO_SET(port, pin, level){ \ if(level) CC2530_GPIO_SET(port, pin); \ else CC2530_GPIO_CLEAR(port, pin); \ } // Set IO as high-level #define HAL_DHT11_IO_SET_LO() HAL_DHT11_IO_SET(HAL_DHT11_PORT, HAL_DHT11_PIN, 0) // Set IO as low-level #define HAL_DHT11_IO_SET_HI() HAL_DHT11_IO_SET(HAL_DHT11_PORT, HAL_DHT11_PIN, 1) /** @brief DHT11 GPIO Status */ #define HAL_DHT11_IO_GET_STA(port, pin) CC2530_GPIO_GET(port, pin) #define HAL_DHT11_IO() HAL_DHT11_IO_GET_STA(HAL_DHT11_PORT, HAL_DHT11_PIN) /** @brief DHT11 Measurement range detection * Temperature: 0~50 C * Humidity: 20~95%RH */ #define HAL_DHT11_TEMP_OK(t) ((t) <= 50) #define HAL_DHT11_HUMI_OK(h) ((h) >= 20 && (h) <= 95) /******************************************************************* * Local Functions Declarations ******************************************************************* */ static void halDHT11SetIdle(void); static uint8 halDHT11ReadByte(void); static uint8 halDHT11CheckData(uint8 TempI, uint8 HumiI); /******************************************************************* * Global Functions ******************************************************************* */ /** * @fn halDHT11Init * * @brief Init. DHT11 */ void halDHT11Init(void) { halDHT11SetIdle(); } /** * @fn halDHT11GetData * * @brief Get data from DHT11 * * @param None * * @note Temperature: 0~50 C * Humidity: 20~95% */ halDHT11Data_t halDHT11GetData(void) { halDHT11Data_t dht11Dat = { .ok = 0 }; uint8 HumiI, HumiF, TempI, TempF, CheckSum; /* >18ms, keeping gpio low-level */ HAL_DHT11_IO_SET_LO(); HAL_DHT11_DELAY_MS(60); HAL_DHT11_IO_SET_HI(); /* Wait 20~40us then read ACK */ HAL_DHT11_DELAY_US(35); HAL_DHT11_IO_INPUT(); if(!HAL_DHT11_IO()) { uint16 cnt = 1070; // ~1ms /* Wait for the end of ACK */ while(!HAL_DHT11_IO() && cnt--); if(!cnt) { goto Exit; } /* ~80us, DHT11 GPIO will be set after ACK */ cnt = 1070; // ~1ms HAL_DHT11_DELAY_US(80); while(HAL_DHT11_IO() && cnt--); if(!cnt) { goto Exit; } /* Read data */ HumiI = halDHT11ReadByte(); HumiF = halDHT11ReadByte(); TempI = halDHT11ReadByte(); TempF = halDHT11ReadByte(); CheckSum = halDHT11ReadByte(); /* Checksum */ if(CheckSum == (HumiI + HumiF + TempI + TempF)) { dht11Dat.temp = TempI; dht11Dat.humi = HumiI; dht11Dat.ok = halDHT11CheckData(TempI, HumiI); } } Exit: /* Idle */ halDHT11SetIdle(); return dht11Dat; } /******************************************************************* * Local Functions ******************************************************************* */ /** * @fn halDHT11SetIdle * * @brief DHT11 Idle */ static void halDHT11SetIdle(void) { HAL_DHT11_IO_OUTPUT(); HAL_DHT11_IO_SET_HI(); } /** * @fn halDHT11ReadByte * * @brief Read a byte from DHT11 */ static uint8 halDHT11ReadByte(void) { uint8 dat = 0; for(uint8 i = 0; i < 8; i++) { uint16 cnt = 5350; // ~5ms /* Busy */ while(!HAL_DHT11_IO() && cnt--); if(!cnt) { break; } /* Read bit based on high-level duration: * 26~28us: 0 * >70us: 1 */ HAL_DHT11_DELAY_US(50); if(HAL_DHT11_IO()) { dat <<= 1; dat |= 1; } else { dat <<= 1; continue; } /* Waiting end */ cnt = 1070; // ~1ms while(HAL_DHT11_IO() && cnt--); if(!cnt) { break; } } return dat; } /** * @fn halDHT11CheckData * * @brief Check measured value */ static uint8 halDHT11CheckData(uint8 TempI, uint8 HumiI) { if(HAL_DHT11_HUMI_OK(HumiI)) { if(HAL_DHT11_TEMP_OK(TempI)) return HAL_DHT11_SC_OK; else return HAL_DHT11_SC_TEMP_OUTOFRANGE; } if(HAL_DHT11_TEMP_OK(TempI)) return HAL_DHT11_SC_HUMI_OUTOFRANGE; else return HAL_DHT11_SC_HT_OUTOFRANGE; }