STM32 SPI 访问传感器 ( SCA100T & MS5803 )，头大啊，好几天了！！！

keith_cheung 2014-09-03 06:08:55

我在用 STM32F103R 通过 SPI(1) 访问传感器 : SCA100T(倾角) & MS5803 (气压)，一直不成功。
头都大了，有人用过这二种传感器么？能否给个例程给我？

谢谢！

下面是我用来访问 SCA100T 的部份程序：

#define MEAS 0x00 //测量模式

#define RWTR 0x08 //读写温度数据寄存器

#define STX  0x0E //x通道自检

#define STY  0x0F //Y通道自检

#define RDAX 0x10 //读Ｘ通道加速度值

#define RDAY 0x11 //读Ｙ通道加速度值

//........................



RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOC | RCC_APB2Periph_SPI1, ENABLE);



GPIO_InitTypeDef GPIO_InitStructure;



/* Configure SPI_MASTER pins: NSS, SCK and MOSI */

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;//SPI_MASTER_PIN_NSS | SPI_MASTER_PIN_SCK | SPI_MASTER_PIN_MOSI;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

GPIO_Init(GPIOA, &GPIO_InitStructure);

	

//	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;

//	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

//	GPIO_Init(GPIOA, &GPIO_InitStructure);

	

	

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;//NSS

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

GPIO_Init(GPIOA, &GPIO_InitStructure);

	

	

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;//控制 CSB 及其它

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;

GPIO_Init(GPIOC, &GPIO_InitStructure);









GPIO_ResetBits(GPIOA, GPIO_Pin_4 );

/* SPI_MASTER configuration ------------------------------------------------------*/

SPI_Cmd(SPI1, DISABLE);                                           //必须先禁能,才能改变MODE

	

SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;//SPI_Direction_1Line_Tx;

SPI_InitStructure.SPI_Mode = SPI_Mode_Master;

SPI_InitStructure.SPI_DataSize = SPI_DataSize_16b;

SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;

SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;

SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;//SPI_NSS_Hard;

SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_16;

SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_LSB;

SPI_InitStructure.SPI_CRCPolynomial = 7;

SPI_Init(SPI1, &SPI_InitStructure);



//...............................



GPIO_ResetBits(GPIOC, GPIO_Pin_0);//低电平控制 CSB



/* Wait for SPI_MASTER Tx buffer empty */

 while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);

/* Send SPI_MASTER data */

SPI_I2S_SendData(SPI1, (uint8_t)MEAS);



/* Wait for SPI_MASTER Tx buffer empty */

while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);

/* Send SPI_MASTER data */

SPI_I2S_SendData(SPI1, (uint8_t)RDAX);//读X轴

			

Delay(1);

			

/* Wait for SPI_MASTER Tx buffer empty */

while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);  

Uart_RX_Buffer = SPI_I2S_ReceiveData(SPI1);//得到结果？？？还是要如何做？？？



GPIO_SetBits(GPIOC, GPIO_Pin_0 );