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"u8SPI_TxRxMode;//u8SPI_TxWrite;u8SPI_TxRead;u8SPI_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: voidSPI_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//========================================================================voidSPI_Init(SPI_InitTypeDef *SPIx){if(SPIx->SPI_SSIG == ENABLE)SPCTL &= ~(1<<7);//enable SS, conform Master or Slave by SS pin.elseSPCTL |= (1<<7);//disable SS, conform Master or Slave by SPI_Modeif(SPIx->SPI_Module == ENABLE)SPCTL |= (1<<6);//SPI enableelseSPCTL &= ~(1<<6);//SPI disableif(SPIx->SPI_FirstBit == SPI_LSB)SPCTL |= ~(1<<5);//LSB firstelseSPCTL &= ~(1<<5);//MSB firstif(SPIx->SPI_Mode == SPI_Mode_Slave)SPCTL &= ~(1<<4);//slaveelseSPCTL |= (1<<4);//masterif(SPIx->SPI_CPOL == SPI_CPOL_High)SPCTL |= (1<<3);//SCLK Idle High, Low Active.elseSPCTL &= ~(1<<3);//SCLK Idle Low, High Active.if(SPIx->SPI_CPHA == SPI_CPHA_2Edge)SPCTL |= (1<<2);//sample at the second edgeelseSPCTL &= ~(1<<2);//sample at the first edgeif(SPIx->SPI_Interrupt == ENABLE)IE2 |= (1<<1);elseIE2 &= ~(1<<1);SPCTL = (SPCTL & ~3) | (SPIx->SPI_Speed & 3);//set speedAUXR1 = (AUXR1 & ~(3<<2)) | SPIx->SPI_IoUse;}//========================================================================// 函数: voidSPI_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//========================================================================voidSPI_SetMode(u8 mode){SPI_TxRxMode = mode;if(mode == SPI_Mode_Slave)SPCTL &= ~(1<<4);//slaveelseSPCTL |= (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//========================================================================voidSPI_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: voidSPI_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//========================================================================voidSPI_TrigTx(void){u8i;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"#defineSPI_BUF_LENTH32#defineSPI_BUF_typeidata#defineSPI_Mode_Master1#defineSPI_Mode_Slave0#defineSPI_CPOL_High1#defineSPI_CPOL_Low0#defineSPI_CPHA_1Edge1#defineSPI_CPHA_2Edge0#defineSPI_Speed_40#defineSPI_Speed_161#defineSPI_Speed_642#defineSPI_Speed_1283#defineSPI_MSB0#defineSPI_LSB1#defineSPI_P12_P13_P14_P15(0<<2)#defineSPI_P24_P23_P22_P21(1<<2)#defineSPI_P54_P40_P41_P43(2<<2)typedef struct{u8SPI_Module;//ENABLE,DISABLEu8SPI_SSIG;//ENABLE, DISABLEu8SPI_FirstBit;//SPI_MSB, SPI_LSBu8SPI_Mode;//SPI_Mode_Master, SPI_Mode_Slaveu8SPI_CPOL;//SPI_CPOL_High, SPI_CPOL_Lowu8SPI_CPHA;//SPI_CPHA_1Edge, SPI_CPHA_2Edgeu8SPI_Interrupt;//ENABLE,DISABLEu8SPI_Speed;//SPI_Speed_4, SPI_Speed_16,SPI_Speed_64,SPI_Speed_128u8SPI_IoUse;//SPI_P12_P13_P14_P15, SPI_P24_P23_P22_P21, SPI_P54_P40_P41_P43} SPI_InitTypeDef;externu8SPI_TxRxMode;externu8SPI_TxWrite;externu8SPI_TxRead;externu8SPI_RxCnt;externu8 SPI_RxTimerOut;externu8 SPI_BUF_type SPI_RxBuffer[SPI_BUF_LENTH];externu8 SPI_BUF_type SPI_TxBuffer[SPI_BUF_LENTH];externu8 *SPI_pTxBuffer;externbit B_SPI_RxOk;externbit B_SPI_TxBusy;voidSPI_Init(SPI_InitTypeDef *SPIx);voidSPI_SetMode(u8 mode);voidSPI_WriteToTxBuf(u8 dat);voidSPI_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);}voidSPI_config(void){SPI_InitTypeDefSPI_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
