/*****************************************************************************************************
* @brief: LDC1000应用程序
* _____________ _______________
* |PB4(SSI2CLK)
----> SCLK|
* |PB5(SSI2FSS)
----> CSB |
* |PB6(SSI2RX) <---- SDO
|
* Tiva M4 |PB7(SSI2TX)
----> SDI
| LDC1000
* |PA4(INT/GPIO)
<---- INTB|
* |PB0(Timer CLK)
----> TBCLK|
* _____________| |______________
*****************************************************************************************************/
#include <stdint.h>
#include <stdbool.h>
#include "driverlib/rom.h"
#include "driverlib/adc.h"
#include "driverlib/sysctl.h"
#include "driverlib/pwm.h"
#include "driverlib/timer.h"
#include "driverlib/gpio.h"
#include "driverlib/pin_map.h"
#include "driverlib/interrupt.h"
#include "driverlib/ssi.h"
#include "inc/hw_ints.h"
#include "inc/hw_memmap.h"
#include "inc/hw_gpio.h"
#include "LDC1000_cmd.h"
#include "inc/hw_timer.h"
#include "inc/hw_types.h"
#include "inc/hw_ssi.h"
#ifndef TARGET_IS_BLIZZARD_RA1
#define TARGET_IS_BLIZZARD_RA1
#endif
#ifndef PART_TM4C123GH6PM
#define PART_TM4C123GH6PM
#endif
#define SPI_RWBIT 0x80
//LDC1000,SPI时序读写位,1=读,0=写
unsigned long ProximityData; //LDC上Proximity Data
unsigned long FrequencyData; //LDC1000上的Frequency Data
volatile unsigned char DataRdy ; //LDC1000中断标志
uint32_t DataRcv[5] ; //存储SPI读取的数据
/********************************************************************
* @brief: SPI写数据
* @param: unsigned int,SPIdata:待写的数据
* @return: none
*********************************************************************/
void SPIDataSend(unsigned int SPIdata)
{
SSIDataPut(SSI2_BASE,SPIdata);
//SPI发送(写)数据
while(SSIBusy(SSI2_BASE)) ;
//等待SPI发送(写)完成
}
/********************************************************************
* @brief: LDC1000初始化配置,ps:在SPI中配置了数据位16个数据长度,故
* 在发送数据时可以将地址和值进行或运算一起发送出去
* @param: none
* @return: none
*********************************************************************/
void LDC1000_init()
{
SPIDataSend(LDC1000_CMD_RPMAX<<8|TEST_RPMAX_INIT);
//配置Rp_MAX(0x01)寄存器
SPIDataSend(LDC1000_CMD_RPMIN<<8|TEST_RPMIN_INIT);
//配置Rp_MIN(0x02)寄存器
SPIDataSend(LDC1000_CMD_SENSORFREQ<<8|0x94);
//配置Sensor Frequency(0x03)寄存器
SPIDataSend(LDC1000_CMD_LDCCONFIG<<8|0x17);
//配置LDC Configuration(0x04)寄存器
SPIDataSend(LDC1000_CMD_CLKCONFIG<<8|0x00);
//配置Clock Configuration(0x05)寄存器,
//使用TBCLK作为时钟源
SPIDataSend(LDC1000_CMD_INTCONFIG<<8|0x02);
//配置INTB Pin Configuration(0x0A),
//配置INTB为比较输出标志位(status of Comparator output)
SPIDataSend(LDC1000_CMD_THRESHILSB<<8|0x50);
//配置Comparator Threshold High(0x06)寄存器低8位
SPIDataSend(LDC1000_CMD_THRESHIMSB<<8|0x14);
//配置Comparator Threshold High(0x07)寄存器高8位
SPIDataSend(LDC1000_CMD_THRESLOLSB<<8|0xC0);
//配置Comparator Threshold Low(0x08)寄存器低8位
SPIDataSend(LDC1000_CMD_THRESLOMSB<<8|0x12);
//配置Comparator Threshold Low(0x09)寄存器高8位
SPIDataSend(LDC1000_CMD_PWRCONFIG<<8|0x01);
//配置Power Configuration(0x0B)寄存器,
//为Active Mode,使能转化
}
/********************************************************************
* @brief: 使用SPI读取LDC1000中的数据
* @param: none
* @return: none
*********************************************************************/
void LDCRead()
{
SPIDataSend((LDC1000_CMD_PROXLSB|SPI_RWBIT)<<8);
//写入将要读取的Proximity Data LSB寄存器地址(0x21)
SSIDataGet(SSI2_BASE,&DataRcv[0]);
//读取上述寄存器中的值,并存入DataRcv[0]
ProximityData|= DataRcv[0] ;
SPIDataSend((LDC1000_CMD_PROXMSB|SPI_RWBIT)<<8);
//写入将要读取的Proximity Data MSB寄存器地址(0x22)
SSIDataGet(SSI2_BASE,&DataRcv[1]);
//读取上述寄存器中的值,并存入DataRcv[1]
ProximityData|= (DataRcv[1]<<8) ;
//组合成ProximityData
SPIDataSend((LDC1000_CMD_FREQCTRLSB|SPI_RWBIT)<<8);
//写入将要读取的Frequency Counter Data LSB寄存器地址(0x23)
SSIDataGet(SSI2_BASE,&DataRcv[2]);
//读取上述寄存器中的值,并存入DataRcv[2]
FrequencyData|= DataRcv[2] ;
SPIDataSend((LDC1000_CMD_FREQCTRMID|SPI_RWBIT)<<8);
//写入将要读取的Frequency Counter Data Mid-Byte寄存器地址(0x24)
SSIDataGet(SSI2_BASE,&DataRcv[3]);
//读取上述寄存器中的值,并存入DataRcv[3]
FrequencyData|= (DataRcv[3]<<8) ;
SPIDataSend((LDC1000_CMD_FREQCTRMSB|SPI_RWBIT)<<8);
//写入将要读取的Frequency Counter Data MSB寄存器地址(0x25)
SSIDataGet(SSI2_BASE,&DataRcv[4]);
//读取上述寄存器中的值,并存入DataRcv[4]
FrequencyData|= (DataRcv[4]<<16) ;
//组合成FrequencyData
GPIOIntEnable(GPIO_PORTA_BASE,GPIO_INT_PIN_4);
//使能PA4中断
}
/********************************************************************
* @brief: Timer初始化
* @param: none
* @return: none
* _____________ _______________
* | |
* Tiva M4 |PB0(Timer CLK)
----> TBCLK|
LDC1000
* _____________| |______________
*********************************************************************/
void TimerInit()
{
TimerDisable(TIMER2_BASE,TIMER_A);
GPIOPinTypeTimer(GPIO_PORTB_BASE,GPIO_PIN_0);
GPIOPinConfigure(GPIO_PB0_T2CCP0);
//配置PB0为CCP模式
HWREG(TIMER2_BASE + TIMER_O_CFG) = 0x04;
//选择16-bit timer
//配置TimerA周期计数(Periodic Timer mode)
HWREG(TIMER2_BASE + TIMER_O_TAMR)|=(TIMER_TAMR_TAAMS|TIMER_TAMR_TAMR_PERIOD) ;
//加载Timer计数值:40,并且设置Match值:20(Timer默认为减计数)
HWREG(TIMER2_BASE + TIMER_O_TAMATCHR) = 20;
TimerLoadSet(TIMER2_BASE,TIMER_A,40);
TimerEnable(TIMER2_BASE,TIMER_A);
//使能Timer
}
/********************************************************************
* @brief: PA4初始化
* @param: none
* @return: none
* _________ ___________
* | |
* | |
* Tiva M4
| PA4 <--- INTB| LDC1000
* | |
* —————————| |__________
*********************************************************************/
void GPIOInit()
{
HWREG(GPIO_PORTA_BASE + GPIO_O_DEN) |= 1<<4 ;
GPIOIntTypeSet(GPIO_PORTA_BASE,GPIO_PIN_4,GPIO_RISING_EDGE); //配置为上升沿中断
GPIOIntEnable(GPIO_PORTA_BASE,GPIO_INT_PIN_4);
//使能PA4中断
IntEnable(INT_GPIOA);
//使能GPIOA中断
}
/********************************************************************
* @brief:
SPI通信初始化
* @param:
none
* @return:
none
* _____________ _______________
* |PB4(SSI2CLK)
----> SCLK|
* |PB5(SSI2FSS)
----> CSB |
* |PB6(SSI2RX) <---- SDO
|
* Tiva M4 |PB7(SSI2TX)
----> SDI
| LDC1000
* |PB0(Timer CLK)
----> TBCLK|
* _____________| |______________
*********************************************************************/
void SPIInit()
{
//配置PB6为SSI2RX,即对Tiva M4而言的SPI数据接收线
GPIOPinTypeSSI(GPIO_PORTB_BASE,GPIO_PIN_6) ;
GPIOPinConfigure(GPIO_PB6_SSI2RX);
//配置PB6为SSI2TX,即对Tiva M4而言的SPI数据发送线
GPIOPinTypeSSI(GPIO_PORTB_BASE,GPIO_PIN_7) ;
GPIOPinConfigure(GPIO_PB7_SSI2TX);
//配置PB4为SSI2CLK线,作为时钟线
GPIOPinTypeSSI(GPIO_PORTB_BASE,GPIO_PIN_4) ;
GPIOPinConfigure(GPIO_PB4_SSI2CLK);
//配置PB5为SSI2FFS线,作为片选线
GPIOPinTypeSSI(GPIO_PORTB_BASE,GPIO_PIN_5) ;
GPIOPinConfigure(GPIO_PB5_SSI2FSS);
SSIDisable(SSI2_BASE); //禁能SSI2
//配置SSI2为SSI_FRF_MOTO_MODE_0协议格式,SPI主模式,时钟源为5K,16位数据长度
SSIConfigSetExpClk(SSI2_BASE,SysCtlClockGet(),SSI_FRF_MOTO_MODE_0,SSI_MODE_MASTER,5000,16);
SSIEnable(SSI2_BASE) ;
//使能SSI2
}
/********************************************************************
* @brief:
PA4中断服务函数,该函数在startup_ccs.c的中断向量表中进行
* 了注册
* @param:
none
* @return:
none
* _________ ___________
* | |
* | |
* Tiva M4
| PA4 <--- INTB| LDC1000
* | |
* —————————| |__________
*********************************************************************/
void GPIOAIntHandler()
{
GPIOIntClear(GPIO_PORTA_BASE,GPIO_INT_PIN_4) ;
//清除PA4中断标志
DataRdy = 1 ;
//LDC1000中断标志置位
GPIOIntDisable(GPIO_PORTA_BASE,GPIO_INT_PIN_4) ;
//禁能PA4中断,将在SPI数据读取完成后重新使能PA4中断
}
//---------------------------------------main函数----------------------------------------------
int main(void)
{
SysCtlClockSet(SYSCTL_SYSDIV_4 | SYSCTL_USE_PLL | SYSCTL_XTAL_16MHZ |
//配置主时钟为50MHz
SYSCTL_OSC_MAIN);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA) ;
//使能GPIOA外设模块
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB) ;
//使能GPIOB外设模块
SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER2);
//使能Timer2外设模块
SysCtlPeripheralEnable(SYSCTL_PERIPH_SSI2);
//使能SSI2外设模块
DataRdy = 0 ; //LDC1000中断标志清零
TimerInit() ; //TBCLK所在时钟初始化
GPIOInit() ; //GPIO初始化(PA4)
SPIInit() ; //SPI初始化
LDC1000_init(); //LDC1000初始配置
ROM_IntMasterEnable();
//使能总中断
while(HWREG(SSI2_BASE + SSI_O_SR)& SSI_SR_RNE)
//首先清除SPI上的接收缓存,排除干扰
{
DataRcv[0] = HWREG(SSI2_BASE + SSI_O_DR) ;
}
while(1)
{
//转化结束后读取ProximityData和FrequencyData
if(DataRdy)
{
DataRdy = 0 ;
//LDC1000中断标志清零(在PA4中断服务程序中置位)
LDCRead() ;
//SPI读取数据操作
}
}
}
怎样在stm32中写这个程序????
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如何从Cortex-m向STM32移植使用SPI接口协议