英飛凌磁傳感器 TLE5012b STM32F103 SPI 程序說明

1.硬件：

   A. 英飛凌磁傳感器 TLE5012bE1000

   B. STM32F103

   C. 磁鐵，請用“徑向充磁”的圓磁鐵，如 直徑 10 x 厚 2mm，找TB買

2.TLE5012B_E1000 接線說明:

1:NC
2:SCK <= 120R => stm32f103 PA5
3:CSQ (CS) <= 120R => stm32f103 PB0
4:DATA <= 120R => stm32f103 PA6
  DATA <= 120R => stm32f103 PA7
  DATA <= 2.2K => Vdd 3.3V
  PS:因是三線 SPI , MOSI , MISO 併線使用
 
5:NC
6:Vdd 3.3V
7:GND
8:NC

3.源碼說明：

   A. 初始化 SPI5012B_Init();

   B. 得到 0~359 角度 ReadAngle() 或 角速度 ReadSpeed()

void SPI5012B_Init(void)
{
	SPI_InitTypeDef  SPI_InitStructure;
	GPIO_InitTypeDef GPIO_InitStructure;
	
	RCC_APB2PeriphClockCmd( RCC_APB2Periph_SPI1,ENABLE );
	
	//以下二句，在它處聲明，請增加使用
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB|RCC_APB2Periph_AFIO,ENABLE);
	GPIO_PinRemapConfig(GPIO_Remap_SWJ_Disable,ENABLE);//使JTDO、JTDI、JTCK 當成普通IO口進行操作
	//GPIOB0 當成普通IO口進行操作
	
	/*SPI: NSS,SCK,MISO and MOSI */
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;//PA5--CLK--複用推輓
	GPIO_Init(GPIOA, &GPIO_InitStructure);
	
	//GPIO_StructInit(&GPIO_InitStructure);
	
	/* Configure PA6 as encoder input */
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;//PA6--MISO--輸入
	GPIO_Init(GPIOA, &GPIO_InitStructure);
	
	/* PA7*/
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;//PA7--MOSI--推輓輸出
	GPIO_Init(GPIOA, &GPIO_InitStructure);
	
	GPIO_InitStructure.GPIO_Pin = GPIO_CS_Pin_Name;//PB0--CS--推輓輸出
	GPIO_Init(GPIO_CS_Pin_Type, &GPIO_InitStructure);
	
	/**********SPI****************/
	SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;//SPI1--雙線全雙工！！
	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_2Edge;
	SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
	SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8;
	SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
	SPI_InitStructure.SPI_CRCPolynomial = 7;
	
	SPI_Init(SPI1, &SPI_InitStructure);
	SPI_Cmd(SPI1, ENABLE);
}

uint16_t SPIx_ReadWriteByte(uint16_t byte)
{
	uint16_t retry = 0;
	while( (SPI1->SR&1<<1) == 0 )//發送緩衝區非空
	{
		if( ++retry > 200 )
			return 0;//延遲一段時間後返回
	}
	SPI1->DR = byte;     //發送數據
	
	retry = 0;
	while( (SPI1->SR&1<<0) == 0 ) //接收緩衝區爲空
	{
		if( ++retry > 200 )
			return 0;//延遲一段時間後返回
	}
	return SPI1->DR;          //讀一下緩衝區，清標誌
}


//得到 0~359 度
uint16_t ReadAngle(void)
{
	return ( ReadValue(READ_ANGLE_VALUE) * 360 / 0x10000 );
}

//得到角速度
uint16_t ReadSpeed(void)
{
	return ReadValue(READ_SPEED_VALUE);
}


uint16_t ReadValue(uint16_t u16RegValue)
{
	uint16_t u16Data;

	SPI_CS_ENABLE;
	
	SPIx_ReadWriteByte(u16RegValue);
  SPI_TX_OFF;
	
	//發送 0xFFFF 是無用的，可能是爲了有時鐘
	u16Data = ( SPIx_ReadWriteByte(0xffff) & 0x7FFF ) << 1;//0x12/0xff*100k
	
	SPI_CS_DISABLE;
  SPI_TX_ON;
	
	return(u16Data);
}

/**
  ******************************************************************************
  * @file    spi_TLE5012B.h 
  * @author  Keith Cheung
  * @version V3.5.0
  * @date    13-MAY-2017
  * @brief   This file contains the headers of the spi_TLE5012B.
  ******************************************************************************
  * @attention
  *
  *
  * <h2><center>&copy; COPYRIGHT 2017</center></h2>
  ******************************************************************************
  */
	
#ifndef _TLE5012B_H_
#define _TLE5012B_H_

#include "stm32f10x.h"

//SPI5012B_Init() 時鐘需另外加上

//以下內容需按實際更改
#define SPI_TX_OFF {GPIOA->CRL&=0x0FFFFFFF;GPIOA->CRL|=0x40000000;}//把PA7（MOSI）配置成開漏--輸入模式
#define SPI_TX_ON  {GPIOA->CRL&=0x0FFFFFFF;GPIOA->CRL|=0xB0000000;}//把PA7（MOSI）配置成推輓--輸出模式（50MHz）

#define GPIO_CS_Pin_Name  GPIO_Pin_0
#define GPIO_CS_Pin_Type  GPIOB

//以下內容一般不需變動
#define SPI_CS_ENABLE  GPIO_ResetBits(GPIO_CS_Pin_Type, GPIO_CS_Pin_Name)       //片選腳電平拉低
#define SPI_CS_DISABLE GPIO_SetBits(GPIO_CS_Pin_Type, GPIO_CS_Pin_Name)         //片選腳電平拉高
//#define INDEX_ENABLE   GPIO_SetBits(GPIOA, GPIO_Pin_4)/* for incremental signal index */

//#define CLK_H GPIO_SetBits(GPIOA, GPIO_Pin_5)                 //時鐘腳PA5電平拉高
//#define CLK_L GPIO_ResetBits(GPIOA, GPIO_Pin_5)               //時鐘腳PA5電平拉低

//#define DATA_H	GPIO_SetBits(GPIOA, GPIO_Pin_6)                         //PA6（MISO）電平拉高
//#define DATA_L	GPIO_ResetBits(GPIOA, GPIO_Pin_6)                       //PA6（MISO）電平拉低
//#define READ_DATA	GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_6)

/* SPI command for TLE5012 */
#define READ_STATUS					0x8001			//8000
#define READ_ANGLE_VALUE		0x8021			//8020
#define READ_SPEED_VALUE		0x8031			//8030

#define WRITE_MOD1_VALUE		0x5060							//0_1010_0_000110_0001
#define MOD1_VALUE	0x0001

#define WRITE_MOD2_VALUE		0x5080							//0_1010_0_001000_0001
#define MOD2_VALUE	0x0801

#define WRITE_MOD3_VALUE		0x5091							//0_1010_0_001001_0001
#define MOD3_VALUE	0x0000

#define WRITE_MOD4_VALUE		0x50E0							//0_1010_0_001110_0001
#define MOD4_VALUE	0x0098				//9bit 512

#define WRITE_IFAB_VALUE		0x50B1
#define IFAB_VALUE 0x000D
/* Functionality mode */
#define REFERESH_ANGLE		0

void SPI5012B_Init(void);
void SPI_SendData16(uint16_t SendData);
uint16_t SPI_ReadData16(void);
uint16_t ReadAngle(void);
uint16_t ReadSpeed(void);
uint16_t ReadValue(uint16_t u16Value);
uint16_t SPIx_ReadWriteByte(uint16_t byte);
uint16_t TlE5012W_Reg(uint16_t Reg_CMD, uint16_t Reg_Data);
#endif

4. 源碼下載：http://download.csdn.net/detail/keith_cheung/9841694