/*
編譯版本：IAR?FOR?MSP430?V5.10
MCU:MSP430F5438
注：模擬IIC，單片機可正常讀取sht30溫濕度數據;程序僅僅測試了周期模式下讀取數據;
其他模式請參見sht30數據手冊時序圖，自行修改。
*/


#include?
#include?
#include?

/*宏定義，延時函數，參數為1時相應延時分別為1us和1ms*/
#define?CPU_F???????????????（（double）16000000）
#define?delay_us（x）?????????__delay_cycles（（long）（CPU_F?*?（double）x/1000000.0））
#define?delay_ms（x）?????????__delay_cycles（（long）（CPU_F?*?（double）x/1000.0））

typedef?unsigned?char???uchar;??????????
typedef?unsigned?int????uint;???????????
typedef?unsigned?short??ushort;?????????
typedef?unsigned?long???ulong;??????????
typedef?uchar	????????u8;????????????				
typedef?uint	????????u16;
typedef?ulong	????????u32;

void?IIC_Init（void）;
void?IIC_Start（void）;
void?IIC_Stop（void）;
void?IIC_Ack（void）;
void?IIC_NAck（void）;
void?IIC_Send_Byte（u8?data）;
u8?IIC_Wait_Ack（void?）;

#define???SHT30W????0x88??????????//SHT30器件地址+寫操作使能
#define???SHT30R????0x89??????????//SHT30器件地址+讀操作使能

#define???SDA_OUT?????????（P4DIR?|=?BIT1）???//p4.1---SDA
#define???SDA_IN??????????（P4DIR?&=~BIT1）
#define???SDA_1???????????（P4OUT?|=?BIT1）
#define???SDA_0???????????（P4OUT?&=~BIT1）
#define???SDA_INPUT???????P4IN
#define???SDA?????????????BIT1

#define???SCL_1???????????（P4OUT?|=?BIT2）???//p4.2---SCL
#define???SCL_0???????????（P4OUT?&=~BIT2）
#define???SCL_IN??????????（P4DIR?&=~BIT2）
#define???SCL_OUT?????????（P4DIR?|=?BIT2）

u8?BUFt[6]={0};
u16?temp=0humi=0;
float?tem=0.0;
float?hum=0.0;

//時鐘初始化
void?Sysclk_Init（void）
{
????//1、時鐘初始化，這里你開發板使用的8mhz晶振
????P5SEL?????|=?BIT2+BIT3;?????????????????????????????????????//XT2端口選擇?0000?1100
????UCSCTL6???&=?~XT2OFF;???????????????????????????????????????//使能XT2=8MHZ
????UCSCTL3???|=?SELREF_2;??????????????????????????????????????//FLL模塊的參考時鐘源選擇REFO
????UCSCTL4???|=?SELA_5;????????????????????????????????????????//ACLK?=?XT2?=?8MHZ
????//測試晶振是否產生故障失效，并清除故障失效標志
????do
????{
????????UCSCTL7?&=?~（XT2OFFG?+?XT1LFOFFG?+?XT1HFOFFG?+?DCOFFG）;?//清除XT2、XT1、DCO故障失效標志位?????????????????????????????????????????????????????????
????????SFRIFG1?&=?~OFIFG;??????????????????????????????????????//清除晶振故障失效中斷標志位?
????}while（SFRIFG1&OFIFG）;??????????????????????????????????????//測試晶振故障失效中斷標志位?
????UCSCTL6???&=?~XT2DRIVE0;????????????????????????????????????//減少XT2驅動能力，降低功耗?
????UCSCTL4???|=?SELS_5?+?SELM_5?+SELA_5;???????????????????????//SMCLK?=?MCLK?=?ACLK?=?XT2?=?8MHZ
????//ACLK8分頻、SMCLK8分頻、MCLK不分頻
????UCSCTL5?=?DIVA__16?+?DIVS__16;???????????//所以初始化完成后系統時鐘:ACLK=SMCLK=1MHZ;MCLK=8MHZ
}

//端口初始化
void?IIC_Init（void）
{
????SCL_OUT;????????????//SCL管腳為輸出
????SDA_OUT;????????????//SDA管腳為輸出
????SCL_1;
????SDA_1;
}

//開始條件
void?IIC_Start（void）????????//scl為高電平期間sda產生一個下降沿
{???
????SDA_OUT;??????//sda線輸出
????SDA_1;	??	??
????SCL_1;
????delay_us（20）;
????SDA_0;??????????//START:when?CLK?is?highDATA?change?form?high?to?low?
????delay_us（20）;
????SCL_0;??????????//鉗住I2C總線，準備發送或接收數據
????delay_us（20）;
}

//停

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件??????924309??2018-08-08?09:18??msp430f5438模擬iic讀取sht30\SHT3x_DIS.pdf
?????文件??????530766??2018-08-01?11:58??msp430f5438模擬iic讀取sht30\SHT3x_Sample_Code.pdf
?????文件????????7169??2018-08-08?16:50??msp430f5438模擬iic讀取sht30\test_sht30.c
?????目錄???????????0??2018-08-08?16:52??msp430f5438模擬iic讀取sht30\