STC实验箱4
IAP15W4K58S4
Keil uVision V5.29.0.0
PK51 Prof.Developers Kit Version:9.60.0.0

---

硬件知识

       摘自《STC15系列单片机器件手册》
       STC15系列单片机还提供另一种高速串行通信接口——SPI接口。SPI是一种全双工、高速、同步的通信总线，有两种操作模式：主模式和从模式。在主模式中支持高达3Mbps的速率（工作频率为12MHz时，如果CPU主频采用20MHz到36MHz，则可更高，从模式时速度无法太快，SYSclk/4以内较好），还具有传输完成标志和写冲突标志保护。
       下表总结了STC15系列单片机内部集成了SPI功能的单片机型号：

       上表中√表示对应的系列有相应的功能。

       STC15W系列与STC15F/L系列具有不同的SPI时钟频率，其中，STC15W系列单片机的SPI时钟频率选择如下表所列：
       表中，CPU_CLK是CPU时钟。
       STC15F/L系列单片机的SPI时钟频率选择如下表所列：

       表中，CPU_CLK是CPU时钟。

库函数

SPI的库函数仅在官方例程中发现，未与其他库函数放在一起，请谨慎使用。

spi.c

/*------------------------------------------------------------------*/
/* --- STC MCU International Limited -------------------------------*/
/* --- STC 1T Series MCU RC Demo -----------------------------------*/
/* --- Mobile: (86)13922805190 -------------------------------------*/
/* --- Fax: 86-0513-55012956,55012947,55012969 ---------------------*/
/* --- Tel: 86-0513-55012928,55012929,55012966 ---------------------*/
/* --- Web: www.GXWMCU.com -----------------------------------------*/
/* --- QQ:  800003751 ----------------------------------------------*/
/* If you want to use the program or the program referenced in the  */
/* article, please specify in which data and procedures from STC    */
/*------------------------------------------------------------------*/#include	"spi.h"u8	SPI_TxRxMode;	//
u8	SPI_TxWrite;
u8	SPI_TxRead;
u8	SPI_RxCnt;
u8 	SPI_RxTimerOut;
u8 	SPI_BUF_type SPI_RxBuffer[SPI_BUF_LENTH];
u8 	SPI_BUF_type SPI_TxBuffer[SPI_BUF_LENTH];
bit 	B_SPI_TxBusy = 0;
bit 	B_SPI_RxOk;//========================================================================
// 函数: void	SPI_Init(SPI_InitTypeDef *SPIx)
// 描述: SPI初始化程序.
// 参数: SPIx: 结构参数,请参考spi.h里的定义.
// 返回: none.
// 版本: V1.0, 2012-11-22
//========================================================================
void	SPI_Init(SPI_InitTypeDef *SPIx)
{if(SPIx->SPI_SSIG == ENABLE)			SPCTL &= ~(1<<7);	//enable SS, conform Master or Slave by SS pin.else									SPCTL |=  (1<<7);	//disable SS, conform Master or Slave by SPI_Modeif(SPIx->SPI_Module == ENABLE)			SPCTL |=  (1<<6);	//SPI enableelse									SPCTL &= ~(1<<6);	//SPI disableif(SPIx->SPI_FirstBit == SPI_LSB)		SPCTL |= ~(1<<5);	//LSB firstelse									SPCTL &= ~(1<<5);	//MSB firstif(SPIx->SPI_Mode == SPI_Mode_Slave)	SPCTL &= ~(1<<4);	//slaveelse									SPCTL |=  (1<<4);	//masterif(SPIx->SPI_CPOL == SPI_CPOL_High)		SPCTL |=  (1<<3);	//SCLK Idle High, Low Active.else									SPCTL &= ~(1<<3);	//SCLK Idle Low, High Active.if(SPIx->SPI_CPHA == SPI_CPHA_2Edge)	SPCTL |=  (1<<2);	//sample at the second edgeelse									SPCTL &= ~(1<<2);	//sample at the first  edgeif(SPIx->SPI_Interrupt == ENABLE)		IE2 |=  (1<<1);else									IE2 &= ~(1<<1);SPCTL = (SPCTL & ~3) | (SPIx->SPI_Speed & 3);					//set speedAUXR1 = (AUXR1 & ~(3<<2)) | SPIx->SPI_IoUse;	
}//========================================================================
// 函数: void	SPI_SetMode(u8 mode)
// 描述: SPI设置主从模式函数.
// 参数: mode: 指定模式, 取值 SPI_Mode_Master 或 SPI_Mode_Slave.
// 返回: none.
// 版本: V1.0, 2012-11-22
//========================================================================
void	SPI_SetMode(u8 mode)
{SPI_TxRxMode = mode;if(mode == SPI_Mode_Slave)	SPCTL &= ~(1<<4);	//slaveelse						SPCTL |=  (1<<4);	//master
}//========================================================================
// 函数: void SPI_WriteToTxBuf(u8 dat)
// 描述: SPI装载发送缓冲函数.
// 参数: dat: 要发送的值.
// 返回: none.
// 版本: V1.0, 2012-11-22
//========================================================================
void	SPI_WriteToTxBuf(u8 dat)	//写入发送缓冲，指针+1
{SPI_TxBuffer[SPI_TxWrite] = dat;if(++SPI_TxWrite >= SPI_BUF_LENTH)	SPI_TxWrite = 0;
}//========================================================================
// 函数: void	SPI_TrigTx(void)
// 描述: SPI触发发送函数, 将SPI模式设置为发送模式并将发送缓冲的数据发出.
// 参数: dat: 要发送的值.
// 返回: none.
// 版本: V1.0, 2012-11-22
//========================================================================
void	SPI_TrigTx(void)
{u8	i;if(SPI_TxRead == SPI_TxWrite)	{B_SPI_TxBusy = 0;return;}B_SPI_TxBusy = 1;SPI_SetMode(SPI_Mode_Master);SPI_SS = 0;i = SPI_TxBuffer[SPI_TxRead];if(++SPI_TxRead >= SPI_BUF_LENTH)	SPI_TxRead = 0;SPDAT = i;
}//========================================================================
// 函数: void SPI_Transivion (void) interrupt SPI_VECTOR
// 描述: SPI中断函数.
// 参数: none.
// 返回: none.
// 版本: V1.0, 2012-11-22
//========================================================================
void SPI_Transivion (void) interrupt SPI_VECTOR
{if(SPI_TxRxMode == SPI_Mode_Slave){//	if(!B_SPI_RxOk){if(SPI_RxCnt >= SPI_BUF_LENTH)		SPI_RxCnt = 0;SPI_RxBuffer[SPI_RxCnt++] = SPDAT;SPI_RxTimerOut = 5;}}if(SPI_TxRxMode == SPI_Mode_Master){if(SPI_TxRead != SPI_TxWrite){SPDAT = SPI_TxBuffer[SPI_TxRead];if(++SPI_TxRead >= SPI_BUF_LENTH)		SPI_TxRead = 0;}else{SPI_TxRxMode = SPI_Mode_Slave;SPCTL &= ~(1<<4);	//slaveSPI_SS = 1;B_SPI_TxBusy = 0;}}SPSTAT = SPIF + WCOL;	//清0 SPIF和WCOL标志
}

spi.h

/*------------------------------------------------------------------*/
/* --- STC MCU International Limited -------------------------------*/
/* --- STC 1T Series MCU RC Demo -----------------------------------*/
/* --- Mobile: (86)13922805190 -------------------------------------*/
/* --- Fax: 86-0513-55012956,55012947,55012969 ---------------------*/
/* --- Tel: 86-0513-55012928,55012929,55012966 ---------------------*/
/* --- Web: www.GXWMCU.com -----------------------------------------*/
/* --- QQ:  800003751 ----------------------------------------------*/
/* If you want to use the program or the program referenced in the  */
/* article, please specify in which data and procedures from STC    */
/*------------------------------------------------------------------*/#ifndef	__SPI_H
#define	__SPI_H#include	"config.h"#define	SPI_BUF_LENTH	32
#define	SPI_BUF_type	idata#define	SPI_Mode_Master		1
#define	SPI_Mode_Slave		0
#define	SPI_CPOL_High		1
#define	SPI_CPOL_Low		0
#define	SPI_CPHA_1Edge		1
#define	SPI_CPHA_2Edge		0
#define	SPI_Speed_4			0
#define	SPI_Speed_16		1
#define	SPI_Speed_64		2
#define	SPI_Speed_128		3
#define	SPI_MSB				0
#define	SPI_LSB				1
#define	SPI_P12_P13_P14_P15	(0<<2)
#define	SPI_P24_P23_P22_P21	(1<<2)
#define	SPI_P54_P40_P41_P43	(2<<2)typedef struct
{u8	SPI_Module;		//ENABLE,DISABLEu8	SPI_SSIG;		//ENABLE, DISABLEu8	SPI_FirstBit;	//SPI_MSB, SPI_LSBu8	SPI_Mode;		//SPI_Mode_Master, SPI_Mode_Slaveu8	SPI_CPOL;		//SPI_CPOL_High,   SPI_CPOL_Lowu8	SPI_CPHA;		//SPI_CPHA_1Edge,  SPI_CPHA_2Edgeu8	SPI_Interrupt;		//ENABLE,DISABLEu8	SPI_Speed;		//SPI_Speed_4,      SPI_Speed_16,SPI_Speed_64,SPI_Speed_128u8	SPI_IoUse;		//SPI_P12_P13_P14_P15, SPI_P24_P23_P22_P21, SPI_P54_P40_P41_P43
} SPI_InitTypeDef;extern	u8	SPI_TxRxMode;
extern	u8	SPI_TxWrite;
extern	u8	SPI_TxRead;
extern	u8	SPI_RxCnt;
extern	u8 	SPI_RxTimerOut;
extern	u8 	SPI_BUF_type SPI_RxBuffer[SPI_BUF_LENTH];
extern	u8 	SPI_BUF_type SPI_TxBuffer[SPI_BUF_LENTH];
extern	u8  *SPI_pTxBuffer;
extern	bit 	B_SPI_RxOk;
extern	bit 	B_SPI_TxBusy;void	SPI_Init(SPI_InitTypeDef *SPIx);
void	SPI_SetMode(u8 mode);
void	SPI_WriteToTxBuf(u8 dat);
void	SPI_TrigTx(void);#endif

测试

OLED驱动程序见SPI驱动0.96/1.3寸 OLED屏幕，易修改为DMA控制

main.c

#include "./Drivers/config.h"
#include "./Drivers/delay.h"#include "./Drivers/GPIO.h"
#include "./Drivers/spi.h"
#include "./SPI_OLED/oled.h"void GPIO_config(void)
{GPIO_InitTypeDef GPIO_InitStructure;					//结构定义GPIO_InitStructure.Mode = GPIO_OUT_PP;					//指定IO的输入或输出方式,GPIO_PullUp,GPIO_HighZ,GPIO_OUT_OD,GPIO_OUT_PPGPIO_InitStructure.Pin  = GPIO_Pin_1 | GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;//指定要初始化的IO, 或操作GPIO_Inilize(GPIO_P2,&GPIO_InitStructure);				//初始化为推挽输出GPIO_InitStructure.Mode = GPIO_OUT_OD;					//指定IO的输入或输出方式,GPIO_PullUp,GPIO_HighZ,GPIO_OUT_OD,GPIO_OUT_PPGPIO_InitStructure.Pin  = GPIO_Pin_2;					//指定要初始化的IO, 或操作GPIO_Inilize(GPIO_P2,&GPIO_InitStructure);				
}void	SPI_config(void)
{SPI_InitTypeDef		SPI_InitStructure;SPI_InitStructure.SPI_Module    = ENABLE;              //SPI启动    ENABLE, DISABLESPI_InitStructure.SPI_SSIG      = DISABLE;			  //片选位     ENABLE, DISABLESPI_InitStructure.SPI_FirstBit  = SPI_MSB;			  //移位方向   SPI_MSB, SPI_LSBSPI_InitStructure.SPI_Mode      = SPI_Mode_Master;	  //主从选择   SPI_Mode_Master, SPI_Mode_SlaveSPI_InitStructure.SPI_CPOL      = SPI_CPOL_High;      //时钟相位   SPI_CPOL_High,   SPI_CPOL_LowSPI_InitStructure.SPI_CPHA      = SPI_CPHA_2Edge;	  //数据边沿   SPI_CPHA_1Edge,  SPI_CPHA_2EdgeSPI_InitStructure.SPI_Interrupt = ENABLE;			  //中断允许   ENABLE,DISABLESPI_InitStructure.SPI_Speed     = SPI_Speed_128;		  //SPI速度    SPI_Speed_4, SPI_Speed_16, SPI_Speed_64, SPI_Speed_128SPI_InitStructure.SPI_IoUse     = SPI_P24_P23_P22_P21; //IO口切换   SPI_P12_P13_P14_P15, SPI_P24_P23_P22_P21, SPI_P54_P40_P41_P43SPI_Init(&SPI_InitStructure);SPI_TxRxMode = SPI_Mode_Master;
}void main(void)
{uint8_t i;GPIO_config();SPI_config();EA = 1;OLED_Init();OLED_Clear();OLED_Display_On();	     OLED_ShowString(0, 0, "STC15W4K58  OLED", 16, 0);OLED_ShowString(0, 2, "   2022-01-10", 6, 0);OLED_ShowString(0, 3, "    SPI Test", 6, 0);for(i = 0; i < 7; ++i)OLED_ShowChinese(8 + 16 * i, 6, i, 1);OLED_Refresh_Gram();while(1){}
}

修改OLED_WR_Byte函数

/**
* @brief 向SSD1306写入一个字节
* @param dat:要写入的数据/命令 cmd:数据/命令标志 0,表示命令;1,表示数据;
* @retval None
*/
void OLED_WR_Byte(uint8_t dat, uint8_t cmd)
{OLED_CS_L();if (cmd)OLED_DC_H();elseOLED_DC_L();SPI_TxRead = 0;SPI_TxWrite = 0;SPI_WriteToTxBuf(dat);SPI_TrigTx();while(B_SPI_TxBusy);OLED_DC_H();OLED_CS_H();
}

实验现象