void SPI_Configuration(void) //SPI配置
{
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef SPI_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource4, GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_SPI1);
/* SPI1 ÅäÖÃ */
//AD_SPI1_CS PA4 AD_SPI1_SCK PA5 AD_SPI1_MISO PA6 AD_SPI1_MOSI PA7
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5|GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; //È«Ë«¹¤
SPI_InitStructure.SPI_Mode = SPI_Mode_Master; //Ö÷ģʽ
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; //8λ
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low; //ʱÖÓ¼«ÐÔ ¿ÕÏÐ״̬ʱ,SCK±£³ÖµÍµçƽ
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge; //ʱÖÓÏàλ Êý¾Ý²ÉÑù´ÓµÚÒ»¸öʱÖÓ ÑØ ¿ªÊ¼
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; //Èí¼þ²úÉúNSS
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_64; //²¨ÌØÂÊ¿ØÖÆ SYSCLK/16
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; //Êý¾ÝµØλÔÚÇ°
SPI_InitStructure.SPI_CRCPolynomial = 7; //CRC¶àÏîʽ¼Ä´æÆ÷³õʼֵΪ7
SPI_Init(SPI1, &SPI_InitStructure);
/* ʹÄÜSPI1 */
SPI_Cmd(SPI1, ENABLE);
}ads_cs_0(); //CS LOW ÓÐЧ //main 读取ads1118转换值
while(1)
{
ADS_InitStructure.stru.OS = SINGLE_CONVER;
ADS_InitStructure.stru.MUX = AINPN_0_GND; //CHANNEL 0 ---GND
ADS_InitStructure.stru.PGA = PGA_4096;
ADS_InitStructure.stru.MODE = SINGLE_SHOT;
ADS_InitStructure.stru.DR = DR_128_SPS;
ADS_InitStructure.stru.TS_MODE = ADC_MODE; //ad mode
ADS_InitStructure.stru.PULLUP = PULL_UP_DIS;
ADS_InitStructure.stru.NOP = DATA_VALID;
ADS_InitStructure.stru.CNV_RDY_FL = DATA_READY;
a = SPI_RW_Reg(ADS_InitStructure.word); //write 0x8583 to ads1118 ,twice
while(GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_6)) //loop until DOUT/DRDY set low
{
LCD_WriteEnglishSring(0,2,"VaL not ready.");
delay_ms(1000);
LCD_Clear();
delay_ms(5000);
LCD_WriteEnglishSring(0,0,"ADS1118 TEST !");
}
a=SPI_RW_Reg(ADS_InitStructure.word); //read data
LCD_WriteMunber(0,4,a);
}
//ads1118.c
uint8_t SPI1_SendByte(uint8_t byte)
{
/* Ñ»·¼ì²â·¢ËÍ»º´æÊÇ·ñΪ¿Õ */
while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET)
{
;
}
/* ͨ¹ýSPI1ÍâÉè·¢³öÊý¾Ý */
SPI_I2S_SendData(SPI1, byte);
/* µÈ´ý½ÓÊÕÊý¾Ý Ñ»·¼ì²â·¢ËÍ»º´æ */
while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET)
{
;
}
/* ·µ»Ø¶Á³öÊý¾Ý */
return SPI_I2S_ReceiveData(SPI1);
}
uint32_t SPI_RW_Reg(uint16_t CofigReg)
{
delay_118(10);
readata1=SPI1_SendByte((uint8_t)(CofigReg>>8));
readata2=SPI1_SendByte((uint8_t)CofigReg);
readata3=SPI1_SendByte((uint8_t)(CofigReg>>8));
readata4=SPI1_SendByte((uint8_t)CofigReg);
//readata= ((uint32_t)readata4<<8)|((uint32_t)readata3);//|((uint32_t)readata2<<16)|((uint32_t)readata1<<24);
readata= ((uint32_t)readata4<<8)|((uint32_t)readata3);
delay_118(1000);
//ads_cs_1();
return readata;
}
//ÅäÖüĴæÆ÷( Config Register )
//Operational status/single-shot conversion start
#define CONFIG_BIT_OS (1<<15)
//MUX[2:0]: Input multiplexer configuration
#define CONFIG_BIT_MUX (7<<12)
//PGA[2:0]: Programmable gain amplifier configuration
#define CONFIG_BIT_PGA (7<<9)
//MODE: Device operating mode
#define CONFIG_BIT_MODE (1<<8)
//DR[2:0]: Data rate
#define CONFIG_BIT_DR (7<<5)
//TS_MODE: Temperature sensor mode
#define CONFIG_BIT_TS_MODE (1<<4)
//PULL_UP_EN: Pull-up enable
#define CONFIG_BIT_PULLUP_EN (1<<3)
//NOP: No operation
#define CONFIG_BIT_NOP (3<<1)
//CNV_RDY_FL: Conversion ready flag
#define CONFIG_BIT_CNV_RDY_FL (1<<0)
// ------ Public data type declarations ----------------------------
typedef union
{
//uint8_t Data_MSB :8;
//uint8_t Data_LSB :8;
struct
{
volatile uint8_t CNV_RDY_FL :1; //low
volatile uint8_t NOP :2;
volatile uint8_t PULLUP :1;
volatile uint8_t TS_MODE :1;
volatile uint8_t DR :3;
volatile uint8_t MODE :1;
volatile uint8_t PGA :3;
volatile uint8_t MUX :3;
volatile uint8_t OS :1; //high
} stru;
volatile uint16_t word;
} ADS_InitTypeDef;
typedef enum
{
CONVERING = 0x0,
SINGLE_CONVER = 0x1
} ADS_OS_TypeDef;
typedef enum
{
AINPN_0_1 = 0x0,
AINPN_0_3 = 0x1,
AINPN_1_3 = 0x2,
AINPN_2_3 = 0x3,
AINPN_0_GND= 0x4,
AINPN_1_GND= 0x5,
AINPN_2_GND= 0x6,
AINPN_3_GND= 0x7
} ADS_MUX_TypeDef;
typedef enum
{
PGA_6144 = 0x0,
PGA_4096 = 0x1,
PGA_2048 = 0x2,
PGA_1024 = 0x3,
PGA_512 = 0x4,
PGA_256 = 0x5
} ADS_PGA_TypeDef;
typedef enum
{
CONTIOUS = 0x0,
SINGLE_SHOT = 0x1
} ADS_MODE_TypeDef;
typedef enum
{
DR_8_SPS = 0x0,
DR_16_SPS = 0x1,
DR_32_SPS = 0x2,
DR_64_SPS = 0x3,
DR_128_SPS = 0x4,
DR_250_SPS = 0x5,
DR_475_SPS = 0x6,
DR_860_SPS = 0x7
} ADS_DATARATE_TypeDef;
typedef enum
{
ADC_MODE = 0x0,
TEMPERATURE_MODE = 0x1
} ADS_TSMODE_TypeDef;
typedef enum
{
PULL_UP_DIS = 0x0,
PULL_UP_EN = 0x1
} ADS_PULL_TypeDef;
typedef enum
{
DATA_VALID = 0x1,
DATA_INVALID = 0x0
} ADS_NOP_TypeDef;
typedef enum
{
DATA_READY = 0x0,
DATA_NREADY = 0x1
} ADS_RDY_TypeDef;
// ------ Public function prototypes -------------------------------
#define ads_cs_0() GPIO_ResetBits(GPIOA, GPIO_Pin_4)
#define ads_cs_1() GPIO_SetBits(GPIOA, GPIO_Pin_4)
void delay_118( uint32_t nCount );
uint8_t SPI1_SendByte(uint8_t byte);
uint32_t SPI_RW_Reg(uint16_t CofigReg);
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