在线时间2 小时
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- 2017-7-17
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上面是lmh6401的spi波形图
spi读取id失败,大家帮忙分析下问题:
下面是关键的源码:
//初始化
void SPI_FLASH_Init(void)
{
SPI_InitTypeDef SPI_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
/* Enable SPI1 and GPIO clocks */
/*!< SPI_FLASH_SPI_CS_GPIO, SPI_FLASH_SPI_MOSI_GPIO,
SPI_FLASH_SPI_MISO_GPIO, SPI_FLASH_SPI_DETECT_GPIO
and SPI_FLASH_SPI_SCK_GPIO Periph clock enable */
/*!< SPI_FLASH_SPI Periph clock enable */
macSPI_APBxClock_FUN ( macSPI_CLK, ENABLE );
/*!< Configure SPI_FLASH_SPI_CS_PIN pin: SPI_FLASH Card CS pin */
macSPI_CS_APBxClock_FUN ( macSPI_CS_CLK, ENABLE );
GPIO_InitStructure.GPIO_Pin = macSPI_CS_PIN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(macSPI_CS_PORT, &GPIO_InitStructure);
/*!< Configure SPI_FLASH_SPI pins: SCK */
macSPI_SCK_APBxClock_FUN ( macSPI_SCK_CLK, ENABLE );
GPIO_InitStructure.GPIO_Pin = macSPI_SCK_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(macSPI_SCK_PORT, &GPIO_InitStructure);
/*!< Configure SPI_FLASH_SPI pins: MISO */
macSPI_MISO_APBxClock_FUN ( macSPI_MISO_CLK, ENABLE );
GPIO_InitStructure.GPIO_Pin = macSPI_MISO_PIN;
GPIO_Init(macSPI_MISO_PORT, &GPIO_InitStructure);
/*!< Configure SPI_FLASH_SPI pins: MOSI */
macSPI_MOSI_APBxClock_FUN ( macSPI_MOSI_CLK, ENABLE );
GPIO_InitStructure.GPIO_Pin = macSPI_MOSI_PIN;
GPIO_Init(macSPI_MOSI_PORT, &GPIO_InitStructure);
/* Deselect the FLASH: Chip Select high */
macSPI_FLASH_CS_DISABLE();
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_16b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_128;//128
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;//7
SPI_Init(macSPIx , &SPI_InitStructure);
/* Enable SPI1 */
SPI_Cmd(macSPIx , ENABLE);
}
//主函数循环读取id
.
.
.
.
while(1)
{
macSPI_FLASH_CS_ENABLE();
Delay( 1 );
while (SPI_I2S_GetFlagStatus(macSPIx , SPI_I2S_FLAG_TXE) == RESET);
SPI_I2S_SendData(macSPIx , 0x0);
while (SPI_I2S_GetFlagStatus(macSPIx , SPI_I2S_FLAG_RXNE) == RESET);
DeviceID=SPI_I2S_ReceiveData(SPI1);
Delay(1);
macSPI_FLASH_CS_DISABLE();
}
spi波形图如下:
四线已经在图中标注,发送0x00,典型值应为0x30,但sdo毫无反应,无论发什么都是这样.
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