近期发现技术贴少了，苦于保密问题，也不好乱发。现在发一个STM32F2XX读取RC531的DEMO。
//------------------------------------------------------------------------------------------------------
extern void SPI1_Config(void);
extern unsigned char SPI1_ReadWriteByte(unsigned char TxData);
extern unsigned char Read_RC531_IRQ(void);
/* RC531RST 引脚 */
#define RC531RST_SET() RC531_RSTPD(1) /* 置 RC500RST 为高电平 */
#define RC531RST_CLR() RC531_RSTPD(0) /* 置 RC500RST 为低电平 */
/* RC531NSS 引脚 */
#define RC531NSS_SET() RC531_CS(1) /* 置 RC500RST 为高电平 */
#define RC531NSS_CLR() RC531_CS(0) /* 置 RC500RST 为低电平 */
//全局变量
static volatile MfCmdInfo MInfo;
volatile unsigned char SerBuffer[40];
static volatile MfCmdInfo *MpIsrInfo;
static volatile unsigned char *MpIsrOut;
volatile unsigned char MLastSelectedSnr[4];
//***********************************************************************
//以下代码为1uS的延时,用视波器调整的,很准,KEIL MDK编译,优化等级为0,频率120M
void tDelay_1us(unsigned int nDly){
register unsigned char n;
while(nDly--){
n = 22;
while(n--);
}
}
/****************************************************************************
* 名 称：DelayNS()
* 功 能：长软件延时。
* 入口参数：dly 延时参数，值越大，延时越久
* 出口参数：无
****************************************************************************/
void delay_1ms(unsigned long dly){
tDelay_1us(8000); //1000us
}
/****************************************************************************
* 名 称：delay_50us()
* 功 能：长软件延时。
* 入口参数：dly 延时参数，值越大，延时越久
* 出口参数：无
****************************************************************************/
void delay_50us(unsigned char _50us){
tDelay_1us(40); //50us
}
//*****************************************************************************
//不改动原来函数！必须传入数据
void ResetInfo(void){
memset((unsigned char *)&MInfo,0,sizeof( MInfo));
}
/****************************************************************************
* 名 称：ReadRawIO()
* 功 能：从一个地址读出一个数据(EEPROM)。
* 入口参数：Address 地址
* 出口参数：数据
****************************************************************************/
unsigned char ReadRawIO(unsigned char Address){
unsigned char a;
RC531NSS_CLR();
SPI1_ReadWriteByte((Address<<1)|0x80);
a = SPI1_ReadWriteByte(0xff); //亚指令！
SPI1_ReadWriteByte(0x00);
RC531NSS_SET();
return a;
}
/****************************************************************************
* 名 称：WriteRawIO()
* 功 能：往一个地址写一个数据(EEPROM)。
* 入口参数：Address 地址
value 数据
* 出口参数：无
****************************************************************************/
void WriteRawIO(unsigned char Address, unsigned char value){
RC531NSS_CLR();
SPI1_ReadWriteByte((Address<<1)&0x7f);
SPI1_ReadWriteByte(value);
RC531NSS_SET();
}
/****************************************************************************
* 名 称：WriteIO()
* 功 能：往一个地址写一个数据(EEPROM)。
* 入口参数：Address 地址
value 数据
* 出口参数：无
****************************************************************************/
void WriteIO(unsigned char Address, unsigned char value){
RC531NSS_CLR();
SPI1_ReadWriteByte(0x00);
SPI1_ReadWriteByte(GetRegPage(Address));
RC531NSS_SET();
RC531NSS_CLR();
SPI1_ReadWriteByte((Address<<1)&0x7f);
SPI1_ReadWriteByte(value);
RC531NSS_SET();
}
/****************************************************************************
* 名 称：ReadIO()
* 功 能：从一个地址读出一个数据(EEPROM)。
* 入口参数：Address 地址
* 出口参数：数据
****************************************************************************/
unsigned char ReadIO(unsigned char Address) {
unsigned char a;
RC531NSS_CLR();
SPI1_ReadWriteByte(0x00);
SPI1_ReadWriteByte(GetRegPage(Address));
RC531NSS_SET();
RC531NSS_CLR();
SPI1_ReadWriteByte((Address<<1)|0x80);
a = SPI1_ReadWriteByte(0xff); //亚指令！
SPI1_ReadWriteByte(0x00);
RC531NSS_SET();
return a;
}
/****************************************************************************
* 名 称：RFRegWrite()
* 功 能：往一个地址写一个数据(EEPROM)。
* 入口参数：Address 地址
value 数据
* 出口参数：无
****************************************************************************/
void RFRegWrite(unsigned char Address, unsigned char value){
RC531NSS_CLR();
SPI1_ReadWriteByte(0x00);
SPI1_ReadWriteByte(GetRegPage(Address));
RC531NSS_SET();
RC531NSS_CLR();
SPI1_ReadWriteByte((Address<<1)&0x7f);
SPI1_ReadWriteByte(value);
RC531NSS_SET();
}
/****************************************************************************
* 名 称：ReadIO()
* 功 能：从一个地址读出一个数据(EEPROM)。
* 入口参数：Address 地址
* 出口参数：数据
****************************************************************************/
unsigned char RFRegRead(unsigned char Address){
unsigned char a;
RC531NSS_CLR();
SPI1_ReadWriteByte(0x00);
SPI1_ReadWriteByte(GetRegPage(Address));
RC531NSS_SET();
RC531NSS_CLR();
SPI1_ReadWriteByte((Address<<1)|0x80);
a = SPI1_ReadWriteByte(0xff); //亚指令！
SPI1_ReadWriteByte(0x00);
RC531NSS_SET();
return a;
}
/****************************************************************************
* 名 称：SetBitMask()
* 功 能：清一个bit
* 入口参数：reg 内存
mask俺码
* 出口参数：无
****************************************************************************/
char SetBitMask(unsigned char reg,unsigned char mask){
char tmp = 0x00;
tmp = ReadIO(reg);
WriteIO(reg,tmp | mask); // set bit mask
return 0x00;
}
/****************************************************************************
* 名 称：ClearBitMask()
* 功 能：清一个bit
* 入口参数：reg 内存
mask俺码
* 出口参数：无
****************************************************************************/
char ClearBitMask(unsigned char reg,unsigned char mask){
char tmp = 0x00;
tmp = ReadIO(reg);
WriteIO(reg,tmp & ~mask); // clear bit mask
return 0x00;
}
/****************************************************************************
* 名 称：FlushFIFO()
* 功 能：清除内部FIFO
* 入口参数：无
* 出口参数：无
****************************************************************************/
void FlushFIFO(void){
SetBitMask(RegControl,0x01);
}
/****************************************************************************
* 名 称：M500PcdCmd()
* 功 能：清一个bit
* 入口参数：unsigned char cmd,
unsigned char *rcv,
MfCmdInfo idata *info
* 出口参数：0正常,其它错误码
****************************************************************************/
char M500PcdCmd(unsigned char cmd,
unsigned char *rcv,
MfCmdInfo *info){
char status = MI_OK;
unsigned char irqEn = 0x00;
unsigned char waitFor = 0x00;
unsigned int timecnt = 0;
char tmpStatus ;
unsigned char lastBits;
WriteIO(RegInterruptEn,0x7F); //开中断
WriteIO(RegInterruptRq,0x7F); //清中断
WriteIO(RegCommand,PCD_IDLE); //清除指令
FlushFIFO();
MpIsrInfo = info;
MpIsrOut = rcv;
info->irqSource = 0x00;
switch(cmd){
case PCD_IDLE: //0x00 无指令,清指令
irqEn = 0x00;
waitFor = 0x00;
break;
case PCD_WRITEE2: //0x01 写FIFO,并定入EEPROM
irqEn = 0x11;
waitFor = 0x10;
break;
case PCD_READE2: //0x03 从EEPROM取数据并写入FIFO
irqEn = 0x07;
waitFor = 0x04;
break;
case PCD_LOADCONFIG: //0x07 从EEPROM读数据并用于初始化
case PCD_LOADKEYE2: //0x0b 将密钥从EEPROM复制到KEY缓存
case PCD_AUTHENT1: //0x0c 执行Cryptol算法的认证过程
irqEn = 0x05;
waitFor = 0x04;
break;
case PCD_CALCCRC: //0x12 激活CRC
irqEn = 0x11;
waitFor = 0x10;
break;
case PCD_AUTHENT2: //0x14 执行Cryptol算法的认证过程二
irqEn = 0x04;
waitFor = 0x04;
break;
case PCD_RECEIVE: //0x16 接收
info->nBitsReceived = -(ReadIO(RegBitFraming) >> 4);
irqEn = 0x06;
waitFor = 0x04;
友情提示: 此问题已得到解决，问题已经关闭,关闭后问题禁止继续编辑，回答。
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/*
S0SPCCR = 128; 设置SPI时钟分频值为128
92.
93. S0SPCR = (0 << 3) | // CPHA = 0, 数据在SCK 的第一个时钟沿采样
94. (1 << 4) | // CPOL = 1, SCK 为低有效
95. (1 << 5) | // MSTR = 1, SPI 处于主模式
96. (0 << 6) | // LSBF = 0, SPI 数据传输MSB (位7)在先
97. (0 << 7); // SPIE = 0, SPI 中断被禁止
98.
*/
//******************************************************************************
#define SPIx_SCK_PIN GPIO_Pin_5
#define SPIx_SCK_SOURCE GPIO_PinSource5
#define SPIx_MISO_PIN GPIO_Pin_6
#define SPIx_MISO_SOURCE GPIO_PinSource6
#define SPIx_MOSI_PIN GPIO_Pin_7
#define SPIx_MOSI_SOURCE GPIO_PinSource7
#define SPIx_NSS_PIN GPIO_Pin_2
#define SPIx_NSS_SOURCE GPIO_PinSource2
//***************************************************************************
void SPI1_IO_Init(void){
GPIO_InitTypeDef GPIO_InitStructure;
/* SPI pin mappings */
GPIO_PinAFConfig(GPIOA, SPIx_SCK_SOURCE, GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOA, SPIx_MOSI_SOURCE, GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOA, SPIx_MISO_SOURCE, GPIO_AF_SPI1);
// GPIO_PinAFConfig(GPIOB, SPIx_NSS_SOURCE, GPIO_AF_SPI1);
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_100MHz;
/* SPI SCK pin configuration */
GPIO_InitStructure.GPIO_Pin = SPIx_SCK_PIN;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* SPI MOSI pin configuration */
GPIO_InitStructure.GPIO_Pin = SPIx_MOSI_PIN;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* SPI MISO pin configuration */
GPIO_InitStructure.GPIO_Pin = SPIx_MISO_PIN;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* SPI NSS pin configuration */
// GPIO_InitStructure.GPIO_Pin = SPIx_NSS_PIN;
// GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Pin = SPIx_NSS_PIN | RC531_RSTPD1; //RC531--两个片选
GPIO_Init(GPIOA, &GPIO_InitStructure);
RC531_CS(1);
RC531_RSTPD(1);
//** irq set input
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Pin = RC531_IRQ1; //RC531--irq
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
//*************************************************************************
//读取IRQ的状态！！！！
unsigned char Read_RC531_IRQ(void){
return GPIO_ReadInputDataBit( GPIOA,RC531_IRQ1);
}
//***************************************************************************
void SPI1_Config(void){
SPI_InitTypeDef SPI_InitStructure;
/* Enable the SPI peripheral */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
//RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOC, ENABLE);
SPI1_IO_Init();
/* SPI configuration -------------------------------------------------------*/
//SPI_DeInit(SPI1);
//RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI1, ENABLE);
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;//SPI设置为双线双向全双工
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;//设置为主SPI
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;//设置SPI的数据大小:SPI发送接收8位帧结构
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;//选择了串行时钟的稳态:时钟悬空高
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;//数据捕获于第二个时钟沿
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8;//Fclk/2
/* Initialize the SPI_FirstBit member */
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial=7;
SPI_Init(SPI1, &SPI_InitStructure);
/* Enable SPI1 */
SPI_Cmd(SPI1, ENABLE);
}
/*******************************************************************************
* Function Name : SPI_ReadWriteByte
* Description : SPI读写一个字节（发送完成后返回本次通讯读取的数据）
* Input : unsigned char TxData 待发送的数
* Output : None
* Return : unsigned char RxData 收到的数
Flash_ReadWriteByte
*******************************************************************************/
unsigned char SPI1_ReadWriteByte(unsigned char TxData){
unsigned char RxData = 0;
//等待发送缓冲区空
while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
//发一个字节
SPI_I2S_SendData(SPI1, TxData);
// while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
//等待数据接收
while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
//取数据
RxData = SPI_I2S_ReceiveData(SPI1);
return (unsigned char)RxData;
}
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