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本帖最后由 zhcj66 于 2021-6-21 17:03 编辑
如题<stm32f2xx如何禁用JTAG启用SWD,因用到SPI3> SPI3用到了JTAG管脚,运行发现脉冲信号 只发送一部分,怀疑JTAG未关闭原因导致的
问题已解决, GPIO_PinAFConfig(GPIOB , GPIO_PinSource3, GPIO_AF_SPI3);配置完就ok了
是我逻辑分析仪用的软件不合适导致 采样率没那么高造成部分波形看不到,
- SPI3初始化
- void SPI3_Init(void){
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- SPI_InitTypeDef SPI_InitStructure;
- GPIO_InitTypeDef GPIO_InitStructure;
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- RCC_APB1PeriphClockCmd ( RCC_APB1Periph_SPI3, ENABLE );
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- RCC_APB2PeriphClockCmd_( GPIOB | GPIOG, ENABLE );
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- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
- GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
- GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_InitStructure.GPIO_Pin = macCH376_SPI_CS_PIN;
- GPIO_Init(macCH376_SPI_CS_PORT, &GPIO_InitStructure);
- macCH376_SPI_CS_DISABLE();//Chip Select high
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- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5;
- GPIO_Init(GPIOB, &GPIO_InitStructure);
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- GPIO_PinAFConfig(GPIOB , GPIO_PinSource3, GPIO_AF_SPI3);//连接复用引脚
- GPIO_PinAFConfig(GPIOB , GPIO_PinSource4, GPIO_AF_SPI3);//连接复用引脚
- GPIO_PinAFConfig(GPIOB , GPIO_PinSource5, GPIO_AF_SPI3);//连接复用引脚
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- // SPI1 configuration
- SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; //全双工通讯
- SPI_InitStructure.SPI_Mode = SPI_Mode_Master; //主机模式
- SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; //数据位为8位
- /*模式4*/
- SPI_InitStructure.SPI_CPOL = SPI_CPOL_High; //时钟极性为高电平,即空闲状态下SCLK为低电平
- SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge; //时钟相位为第1个边沿取信号,即上升沿
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- SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; //NSS为软件模式
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- SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256; //时钟为主频的4分频
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- SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; //高位在前发送
- SPI_InitStructure.SPI_CRCPolynomial = 7; //奇偶校验
- SPI_Init(macCH376_SPIx , &SPI_InitStructure);
- /* Enable SPI1 */
- SPI_Cmd(macCH376_SPIx , ENABLE);
- }
复制代码
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阿莫论坛20周年了!感谢大家的支持与爱护!!
一只鸟敢站在脆弱的枝条上歇脚,它依仗的不是枝条不会断,而是自己有翅膀,会飞。
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