#define Rom_csL GPIO_ResetBits(GPIOG,GPIO_Pin_7)
#define Rom_csH GPIO_SetBits(GPIOG,GPIO_Pin_7)
//SPI口初始化
//这里针是对SPI1的初始化
void SPI1_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef SPI_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);//使能GPIOB时钟
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOG, ENABLE);//使能GPIOB时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);//使能SPI1时钟
//GPIOB 3,4,5初始化设置
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5;//PB3~5复用功能
输出
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//复用功能
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//上拉
GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化
GPIO_PinAFConfig(GPIOB,GPIO_PinSource3,GPIO_AF_SPI1); //PB3复用为 SPI1
GPIO_PinAFConfig(GPIOB,GPIO_PinSource4,GPIO_AF_SPI1); //PB4复用为 SPI1
GPIO_PinAFConfig(GPIOB,GPIO_PinSource5,GPIO_AF_SPI1); //PB5复用为 SPI1
//这里只针对SPI口初始化
RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1,ENABLE);//复位SPI1
RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1,DISABLE);//停止复位SPI1
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; //设置SPI
单向或者双向的数据模式:SPI设置为双线双向全双工
SPI_InitStructure.SPI_Mode = SPI_Mode_Master; //设置SPI工作模式: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_High; //串行同步时钟的空闲状态为高电平
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge; //串行同步时钟的第二个跳变沿（上升
或下降）数据被采样
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; //NSS信号由硬件（NSS管脚）还是软
件（使用SSI位）管理:内部NSS信号有SSI位控制
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
//定义波特率预分频的值:波特率预分频值为256
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; //指定数据传输从MSB位还是LSB
位开始:数据传输从MSB位开始
SPI_InitStructure.SPI_CRCPolynomial = 7; //CRC值计算的多项式
SPI_Init(SPI1, &SPI_InitStructure); //根据SPI_InitStruct中指定的参数初始化外设
SPIx寄存器
// CS
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;//输出
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;//
GPIO_Init(GPIOG, &GPIO_InitStructure);//初始化
Rom_csH;
SPI_Cmd(SPI1, ENABLE); //使能SPI外设
}
//SPI1 读写一个字节
//TxData:要写入的字节
//返回值:读取到的字节
u8 SPI1_ReadWriteByte(u8 TxData)
{
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET){}//等待发送区空
SPI_I2S_SendData(SPI1, TxData); //通过外设SPIx发送一个byte 数据
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET){} //等待接收完
一个byte
return SPI_I2S_ReceiveData(SPI1); //返回通过SPIx最近接收的数据
}
static void SPI_Address(unsigned char AddH,unsigned char AddM,unsigned char
AddL)
{
SPI1_ReadWriteByte(AddH);
SPI1_ReadWriteByte(AddM);
SPI1_ReadWriteByte(AddL);
}
unsigned long r_dat_bat(unsigned long address,unsigned long DataLen,unsigned
char *pBuff)
{
unsigned long i;
unsigned char addrHigh;
unsigned char addrMid;
unsigned char addrLow;
addrHigh=address>>16;
addrMid=address>>8;
addrLow=(unsigned char)address;
Rom_csL; //片选选中字库芯片
SPI1_ReadWriteByte(0x03); //普通读取首先送0X03,然后发送地址高八位addrHigh，中八位
addrMid，低八位addrLow。
SPI_Address(addrHigh,addrMid,addrLow);
for(i=0;i<DataLen;i++)
*(pBuff+i)=SPI1_ReadWriteByte(0x00);
Rom_csH;
return i;
}
unsigned char gt_read_data(unsigned char* sendbuf , unsigned char sendlen ,
unsigned char* receivebuf, unsigned int receivelen)
{
unsigned int i;
Rom_csL;
for(i = 0; i < sendlen;i++)
{
SPI1_ReadWriteByte(sendbuf[i]);
}
for(i = 0; i < receivelen;i++)
{
receivebuf[i] = SPI1_ReadWriteByte(0x00);
}
Rom_csH;
return 1;
}
