1. stm32的spi双机通信问题我的stm32 spi全双工通信,主机可以发送数据,从机可以接收数据,但是主机接受不到从机发送的数据,请大家帮帮忙
stmsky 发表于 2010-4-29 08:54
主机接收从机发来的数据的时候,要主动发送DUMMY字节提供时钟
- static u8 SPI_Read_Byte(void)
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{
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//等待发送信号寄存器为非空,然后发送一个字节到spi总线上
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while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
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SPI_I2S_SendData(SPI1, 0x00);
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//等待接收信号寄存器为非空,然后从spi总线上接收一个字节
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while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET) /* Wait to receive a byte */;
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return SPI_I2S_ReceiveData(SPI1) /* Return the byte read from the SPI bus */;
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}
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//spi 写一个字节
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static void SPI_Write_Byte(u8 byte)
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{
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//时序同发生字节一样,只是不返回读取的字节
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while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET) /* Loop while DR register in not emplty */;
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SPI_I2S_SendData(SPI1, byte)/* Send byte through the SPI2 peripheral */;
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while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET) /* Wait to receive a byte */;
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SPI_I2S_ReceiveData(SPI1) /* Return the byte read from the SPI bus */;
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}
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