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標題: stm8 spi 通信，獲得的數據都是0xff或是0xffff,這是哪里問題？ [打印本頁]

作者: lingmin 時間: 2017-12-22 11:21
標題: stm8 spi 通信，獲得的數據都是0xff或是0xffff,這是哪里問題？
我采用的單片機是stm8L051系列的

這個是我spi配置的初始化函數
void MySPI_Init(void)
{

/* SPI Periph clock enable */
CLK_PeripheralClockConfig(SPI_CLK, ENABLE);

/* Set the MOSI,MISO and SCK at high level */
GPIO_Init(SPI_GPIO_PORT, SPI_MOSI_PIN, GPIO_Mode_Out_PP_High_Fast);
GPIO_Init(SPI_GPIO_PORT, SPI_MISO_PIN, GPIO_Mode_In_PU_No_IT);
GPIO_Init(SPI_GPIO_PORT, SPI_SCK_PIN, GPIO_Mode_Out_PP_High_Fast);

  /* Configure FLASH_CS as Output push-pull, used as Flash Chip select */
GPIO_Init(SPI_GPIO_PORT, SPI_CS_PIN, GPIO_Mode_Out_PP_High_Fast);

GPIO_ExternalPullUpConfig(SPI_GPIO_PORT,SPI_MISO_PIN,ENABLE);

SPI_DeInit(SPI1);
SPI_Init(SPI1, SPI_FirstBit_MSB, SPI_BaudRatePrescaler_2, SPI_Mode_Master,
         SPI_CPOL_High, SPI_CPHA_1Edge, SPI_Direction_2Lines_FullDuplex,
         SPI_NSS_Soft, (uint8_t)0x07);

SPI_Cmd(SPI1,ENABLE);

}

#define SPI_CLK                CLK_Peripheral_SPI1
#define SPI_SCK_PIN             GPIO_Pin_5                /* PB.05 */
#define SPI_MISO_PIN             GPIO_Pin_7                /* PB.07 */
#define SPI_MOSI_PIN             GPIO_Pin_6                /* PB.06 */
#define SPI_CS_PIN             GPIO_Pin_4                /* PE.04 */
#define SPI_GPIO_PORT       GPIOB                      /* GPIOE */

這些是我獲得額數據
0xff    0xffff
請問為什么獲得的都是這樣的數據，是硬件問題還是程序配置問題

作者: lingmin 時間: 2017-12-22 11:44
原來這是spi配置問題
spi配置如下

void MySPI_Init(void)
{

/* SPI Periph clock enable */
CLK_PeripheralClockConfig(SPI_CLK, ENABLE);

/* Set the MOSI,MISO and SCK at high level */
// GPIO_Init(SPI_GPIO_PORT, SPI_MOSI_PIN, GPIO_Mode_Out_PP_High_Fast);
GPIO_Init(SPI_GPIO_PORT, SPI_MISO_PIN, GPIO_Mode_In_PU_No_IT);
// GPIO_Init(SPI_GPIO_PORT, SPI_SCK_PIN, GPIO_Mode_Out_PP_High_Fast);

  /* Configure FLASH_CS as Output push-pull, used as Flash Chip select */
GPIO_Init(SPI_GPIO_PORT, SPI_CS_PIN, GPIO_Mode_Out_PP_High_Fast);

GPIO_ExternalPullUpConfig(SPI_GPIO_PORT,SPI_MOSI_PIN|SPI_SCK_PIN,ENABLE);

SPI_DeInit(SPI1);
SPI_Init(SPI1, SPI_FirstBit_MSB, SPI_BaudRatePrescaler_2, SPI_Mode_Master,
         SPI_CPOL_Low, SPI_CPHA_1Edge, SPI_Direction_2Lines_FullDuplex,
         SPI_NSS_Soft, (uint8_t)0x07);

SPI_Cmd(SPI1,ENABLE);

}

#define SPI_CLK                CLK_Peripheral_SPI1
#define SPI_SCK_PIN             GPIO_Pin_5                /* PB.05 */
#define SPI_MISO_PIN             GPIO_Pin_7                /* PB.07 */
#define SPI_MOSI_PIN             GPIO_Pin_6                /* PB.06 */
#define SPI_CS_PIN             GPIO_Pin_4                /* PE.04 */
#define SPI_GPIO_PORT       GPIOB                      /* GPIOE */

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