目的

驅動hs3003溫濕度計

步驟

1. 在原來墨水屏的工程基礎上添加HS3003的驅動。
2. 新建hs3003.c/hs3003.h,并打hs3003.c加入工程。

4. 我償試用硬件驅動i2c，但scl即使使用了上位電阻，也不起振，用邏輯分析儀檢測如下圖：

5. 周轉了半天，還得改回來用軟件i2c來驅動。hs3003.c驅動程序如下：

#include "hs3003.h"
#include "software_i2c.h"
#include "log.h"

#define I2CT_FLAG_TIMEOUT ((uint32_t)0x1000)
#define I2CT_LONG_TIMEOUT ((uint32_t)(20 * I2CT_FLAG_TIMEOUT))

#define SI2C_SDA_GPIOx 	GPIOB
#define SI2C_SCL_GPIOx 	GPIOB
#define SI2C_SDA_Pin 	GPIO_PIN_8
#define SI2C_SCL_Pin    GPIO_PIN_9

static SI2C_HANDLE SI2C_handle;

void i2c_master_init(){
log_info("\\n this is a software i2c master demo\\r\\n");
if(SI2C_Init(&SI2C_handle,SI2C_SDA_GPIOx, SI2C_SCL_GPIOx, SI2C_SDA_Pin, SI2C_SCL_Pin, 5) == false)
{
log_info("software i2c init fail \\r\\n");
while(1);
}
}

uint32_t Humiture_HS3003_ReadData_Raw(void )
{
uint8_t rx_buf[4] = {0};
uint16_t humi, temp;
float    tmp_f   = 0.0;
float humi_f,temp_f;
SI2C_MasterWrite(&SI2C_handle,I2C_SLAVE_ADDR, NULL, 0);
//8bit->1.2ms
//10bit->2.72ms
//12bit->9.10ms
//14bit->33.90ms
Delay_ms(40);
__retry:		
SI2C_MasterRead(&SI2C_handle, I2C_SLAVE_ADDR, rx_buf, 4);

//		log_info("%x,%x,%x,%x\\n", rx_buf[0], rx_buf[1], rx_buf[2], rx_buf[3]);
//    log_info("state:%x\\n", rx_buf[0] & RM_HS300X_MASK_STATUS_0XC0);
if ((rx_buf[0] & RM_HS300X_MASK_STATUS_0XC0) != RM_HS300X_DATA_STATUS_VALID)
{
Delay_ms(100);
goto __retry;
}
humi = (rx_buf[0] & RM_HS300X_MASK_HUMIDITY_UPPER_0X3F) << 8 | rx_buf[1];
temp = (rx_buf[2] << 8 | (rx_buf[3] & RM_HS300X_MASK_TEMPERATURE_LOWER_0XFC)) >> 2;

humi_f = (float)humi;

humi_f = (humi_f * RM_HS300X_CALC_HUMD_VALUE_100) / RM_HS300X_CALC_STATIC_VALUE;

temp_f = (float)temp;
temp_f = ((temp_f * RM_HS300X_CALC_TEMP_C_VALUE_165) / RM_HS300X_CALC_STATIC_VALUE) - RM_HS300X_CALC_TEMP_C_VALUE_40;

log_info("Temp:%d.%d   ",(int)temp_f,(int)(temp_f*100)%100);
log_info("HUMI:%d.%d\\r\\n",(int)humi_f,(int)(humi_f*100)%100);

return 1;

}

bool Humiture_HS3003_init(void)
{
i2c_master_init();

}

6. hs3003.h:

#ifndef __HS3003_H__
#define __HS3003_H__

#include "n32wb03x.h"

#define I2C_MASTER_ADDR   0x30
#define I2C_SLAVE_ADDR        0x44<<1
#define HS300X_HUMD_MULTY           0.00006163516
#define HS300X_TEMP_MULTY           0.00006163516

/* Definitions of Mask Data for A/D data */
#define RM_HS300X_MASK_HUMIDITY_UPPER_0X3F       (0x3F)
#define RM_HS300X_MASK_TEMPERATURE_LOWER_0XFC    (0xFC)
#define RM_HS300X_MASK_STATUS_0XC0               (0xC0)

/* Definitions for Status Bits of A/D Data */
#define RM_HS300X_DATA_STATUS_VALID              (0x00) // Status-bit: Valid data

/* Definitions for Calculation */
#define RM_HS300X_CALC_STATIC_VALUE              (16383.0F)
#define RM_HS300X_CALC_HUMD_VALUE_100            (100.0F)
#define RM_HS300X_CALC_TEMP_C_VALUE_165          (165.0F)
#define RM_HS300X_CALC_TEMP_C_VALUE_40           (40.0F)
#define RM_HS300X_CALC_DECIMAL_VALUE_100         (100.0F)

bool Humiture_HS3003_init(void);

uint32_t Humiture_HS3003_ReadData_Raw(void );

#endif

7、在主程序中調用一下：

#include "main.h"
#include "led.h"
#include "key.h"
#include "log.h"
#include "hs3003.h"

unsigned char BlackImage[4736];//Define canvas space

int main(void)
{
unsigned char fen_L,fen_H,miao_L,miao_H;
log_init();

Humiture_HS3003_init();

Humiture_HS3003_ReadData_Raw();

while (1)

{

Humiture_HS3003_ReadData_Raw();

Delay_ms(1000);

}

}

實驗效果

總結

不知道是不是硬件i2c的驅動是不是有問題，反正我的浪費了半天的時間，各種工具用上，最后還是得用軟件才搞定。

審核編輯 黃宇