问题如下:
操作SPI,为何会出现这样的波形:
SPI_CLK和MOSI波形,不是落在IO模拟SPI_CS的波形之内,可我的程序是对的:
#define SPI_FLASH_CS_LOW() GPIO_ResetBits(GPIOA, GPIO_Pin_4) //片选引脚/CS拉低
#define SPI_FLASH_CS_HIGH() GPIO_SetBits(GPIOA, GPIO_Pin_4) //片选引脚/CS拉高
SPI_FLASH_CS_LOW();
SPI_FLASH_SendByte(0x38);
SPI_FLASH_SendByte(0x00);
SPI_FLASH_SendByte(0x02);
SPI_FLASH_SendByte(0xDB);
SPI_FLASH_SendByte(0xFF);
Temp0 = SPI_FLASH_SendByte(0xA5);
Temp1 = SPI_FLASH_SendByte(0xA5);
Temp2 = SPI_FLASH_SendByte(0xA5);
SPI_FLASH_CS_HIGH();
下图是CS的波形
CS
下图是MOSI
MOSI
下图是MCLK
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