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- 2010-10-6
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贡献stm32的16位AD7750驱动代码(SPI2)
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- void AD7705_SPI_Init(void) // SPI 初始化
- {
- SPI_InitTypeDef SPI_InitStructure;
- GPIO_InitTypeDef GPIO_InitStructure;
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2,ENABLE);
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
- GPIO_Init(GPIOB, &GPIO_InitStructure);
- //SPI接口配置
- /* Configure SPI2 pins: SCK, MISO and MOSI ---------------------------------*/
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
- GPIO_Init(GPIOB, &GPIO_InitStructure);
- SPI_Cmd(SPI2, DISABLE);
- /* SPI2 Config -------------------------------------------------------------*/
- SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
- SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
- SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; //8个字节发送接受模式
- SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
- SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
- SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
- SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_64; //72M 64分频
- SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
- SPI_InitStructure.SPI_CRCPolynomial = 7;
- SPI_Init(SPI2, &SPI_InitStructure);
- /* Enable SPI2 */
- SPI_Cmd(SPI2, ENABLE);
- }
- void AD7705_Init(void) //AD初始化
- {
- AD7705_SPI_Init(); //初始化SPI
- Delayus(1); //延时1us
- AD7705_RESET(); //写1 进行复位
- Delayus(1);
- AD7705_RW(0x20); //写命令 准备设置时钟寄存器
- Delayus(1);
- AD7705_RW(0x08); //设置时钟寄存器
- Delayus(1);
- AD7705_RW(0x10); //写命令 准备设置模式
- Delayus(1);
- AD7705_RW(0x44); //设置模式 自校准,增益1,单极,无缓冲
- SysTickDelay(1); //延时1ms
- }
- //读写ad7750芯片函数
- unsigned short AD7705_RW(unsigned short data)
- {
- //读取数据放入软FIFO
- u16 rdata;
- //AD_CS(0);
- /* Wait for SPI2 Tx buffer empty */
- while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE) == RESET);
- /* Send SPI2 data */
- SPI_I2S_SendData(SPI2,data);
- /* Wait for SPI2 data reception */
- while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE) == RESET);
- /* Read SPI2 received data */
- rdata=SPI_I2S_ReceiveData(SPI2);
- //AD_CS(1);
- return rdata;
- }
- //写1复位
- int AD7705_RESET(void)
- {
- int i=0;
- for(i=0;i<5;i++)
- {
- SPI_I2S_SendData(SPI2,0xff);
- SysTickDelay(1);
- }
- }
- //采集函数
- u32 GetAD7705(void)
- {
- u16 rdata=0,temp=0;
- AD7705_Init();
- temp=AD7705_RW(0x00);
- temp&=0xff;
- rdata=AD7705_RW(0x00);
- rdata&=0xff;
- temp=(temp<<8);
- rdata|=temp;
- SysTickDelay(1);
- return rdata;
- }
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