SPI配置问题

只看该作者 · 2023-11-23 14:54

我按照官方例程修改了ping脚和软件片选，调试过程测认为应该是SPI都没初始化成功，麻烦各位帮忙看下是哪部分造成SPI初始化没成功，判断没初始化成功是因为我再main里一直调发送接口，但是实测没有波形下面是spi.c的配置
#include "./flash/spi.h"

void spi_gpio_init(void)
{
GPIO_InitType GPIO_InitStructure;

RCC_Pclk2_Config(RCC_HCLK_DIV2);

RCC_AHB_Peripheral_Clock_Enable(RCC_AHB_PERIPH_GPIOA|RCC_AHB_PERIPH_GPIOB);
//RCC_APB2_Peripheral_Clock_Enable(RCC_APB2_PERIPH_AFIO);
GPIO_Structure_Initialize(&GPIO_InitStructure);

// SPI_MISO  PA9 AF1  ||SPI_CLK  PA10 AF6 ||SPI_MOSI PB1 AF2 ||SPI_CS  PA15  ||
GPIO_InitStructure.Pin          = SPI_MISO;
GPIO_InitStructure.GPIO_Mode    = GPIO_MODE_AF_PP;
GPIO_InitStructure.GPIO_Slew_Rate = GPIO_SLEW_RATE_FAST;
GPIO_InitStructure.GPIO_Alternate = GPIO_AF1_SPI2;
GPIO_Peripheral_Initialize(GPIOA, &GPIO_InitStructure);

GPIO_InitStructure.Pin          = SPI_MOSI;
GPIO_InitStructure.GPIO_Alternate = GPIO_AF2_SPI2;
GPIO_Peripheral_Initialize(GPIOB, &GPIO_InitStructure);

/* If CLKPOL is HIGH, set SPI_SCK GPIO to GPIO_PULL_UP, otherwise set to GPIO_PULL_DOWN */
GPIO_InitStructure.Pin          = SPI_CLK;
GPIO_InitStructure.GPIO_Pull    = GPIO_PULL_DOWN;
GPIO_InitStructure.GPIO_Alternate = GPIO_AF6_SPI2;
GPIO_Peripheral_Initialize(GPIOA, &GPIO_InitStructure);

GPIO_Structure_Initialize(&GPIO_InitStructure);

GPIO_InitStructure.Pin       = SPI_CS;
GPIO_InitStructure.GPIO_Mode = GPIO_MODE_OUT_PP;
GPIO_InitStructure.GPIO_Current = GPIO_DS_4MA;
GPIO_Peripheral_Initialize(GPIOA, &GPIO_InitStructure);

}

void spi_init(void)
{
SPI_InitType SPI_InitStructure;

RCC_APB2_Peripheral_Clock_Enable(RCC_APB2_PERIPH_SPI2);

spi_gpio_init();

SPI_Initializes_Structure(&SPI_InitStructure);
SPI_InitStructure.DataDirection = SPI_DIR_SINGLELINE_TX | SPI_DIR_SINGLELINE_RX;
SPI_InitStructure.SpiMode    = SPI_MODE_MASTER;
SPI_InitStructure.DataLen    = SPI_DATA_SIZE_8BITS;
SPI_InitStructure.CLKPOL       = SPI_CLKPOL_LOW;
SPI_InitStructure.CLKPHA       = SPI_CLKPHA_FIRST_EDGE;
SPI_InitStructure.NSS          = SPI_NSS_SOFT;
/* It is recommended that the SPI master mode of the C version chips should not exceed 18MHz */
SPI_InitStructure.BaudRatePres  = SPI_BR_PRESCALER_8;
SPI_InitStructure.FirstBit    = SPI_FB_MSB;
SPI_InitStructure.CRCPoly    = 7;
SPI_Initializes(SPI2, &SPI_InitStructure);
SPI_SS_Output_Enable(SPI2);
/* Enable SPI_MASTER */
SPI_ON(SPI2);

SPI_CS_HIGH();
}

uint8_t spi_transmit(uint8_t data)
{
uint8_t brxbuff;

SPI_I2S_Data_Transmit(SPI2, data);
while(SPI_I2S_Flag_Status_Get(SPI2, SPI_I2S_FLAG_TE) == RESET);
brxbuff = SPI_I2S_Data_Get(SPI2);
while(SPI_I2S_Flag_Status_Get(SPI2, SPI_I2S_FLAG_BUSY) != RESET) ;
return brxbuff;
}
spi.h的配置是

#ifndef  SPI_H_
#define  SPI_H_
#include "n32g430.h"
#define SPI_CS_HIGH() GPIO_Pins_Set(GPIOA,GPIO_PIN_15);
#define SPI_CS_LOW() GPIO_Pins_Reset(GPIOA,GPIO_PIN_15);
//PA
#define SPI_MISO GPIO_PIN_9
#define SPI_CLK    GPIO_PIN_10
#define SPI_CS    GPIO_PIN_15
//PB
#define SPI_MOSI GPIO_PIN_1

void spi_init(void);
uint8_t spi_transmit(uint8_t data);
#endif // ! SPI_H_

只看该作者 · 2023-11-23 17:16

SPI_MISO应该配置成input吧

只看该作者 · 2023-11-24 11:57

例程里都是重映射？重映射可就换引脚了，你看一下是多有引脚都没有输出吗？CS呢

只看该作者 · 2023-11-27 10:23

例程中的配置是这样的
void GPIO_Configuration(void)
{
GPIO_InitType GPIO_InitStructure;

GPIO_Structure_Initialize(&GPIO_InitStructure);
/* Configure slave pins: NSS, SCK, MISO and MOSI */
/* Confugure SPI pins as Input Floating */
GPIO_InitStructure.Pin          = SPI_SLAVE_CLK_PIN | SPI_SLAVE_MISO_PIN | SPI_SLAVE_NSS_PIN;
GPIO_InitStructure.GPIO_Mode    = GPIO_MODE_AF_PP;
GPIO_InitStructure.GPIO_Alternate = SPI_SLAVE_GPIO_ALTERNATE;
GPIO_Peripheral_Initialize(SPI_SLAVE_GPIO, &GPIO_InitStructure);

/* Configure master pins: NSS, SCK, MISO and MOSI */
/* Confugure SPI pins as Alternate Function Push Pull */
GPIO_InitStructure.Pin          = SPI_MASTER_MOSI_PIN | SPI_MASTER_CLK_PIN | SPI_MASTER_NSS_PIN;
GPIO_InitStructure.GPIO_Mode    = GPIO_MODE_AF_PP;
GPIO_InitStructure.GPIO_Slew_Rate = GPIO_SLEW_RATE_FAST;
GPIO_InitStructure.GPIO_Alternate = SPI_MASTER_GPIO_ALTERNATE;
GPIO_Peripheral_Initialize(SPI_MASTER_GPIO, &GPIO_InitStructure);
/* If CLKPOL is HIGH, set SPI_SCK GPIO to GPIO_PULL_UP, otherwise set to GPIO_PULL_DOWN */
GPIO_InitStructure.Pin          = SPI_MASTER_CLK_PIN;
GPIO_InitStructure.GPIO_Mode    = GPIO_MODE_AF_PP;
GPIO_InitStructure.GPIO_Slew_Rate = GPIO_SLEW_RATE_FAST;
GPIO_InitStructure.GPIO_Pull    = GPIO_PULL_DOWN;
GPIO_InitStructure.GPIO_Alternate = SPI_MASTER_GPIO_ALTERNATE;
GPIO_Peripheral_Initialize(SPI_MASTER_GPIO, &GPIO_InitStructure);
}

只看该作者 · 2023-11-27 10:23

/* SPI_MASTER configuration ------------------------------------------------------*/
SPI_Initializes_Structure(&SPI_InitStructure);
SPI_InitStructure.DataDirection = SPI_DIR_SINGLELINE_TX;
SPI_InitStructure.SpiMode    = SPI_MODE_MASTER;
SPI_InitStructure.DataLen    = SPI_DATA_SIZE_16BITS;
SPI_InitStructure.CLKPOL       = SPI_CLKPOL_LOW;
SPI_InitStructure.CLKPHA       = SPI_CLKPHA_SECOND_EDGE;
SPI_InitStructure.NSS          = SPI_NSS_HARD;
/* It is recommended that the SPI master mode of the C version chips should not exceed 18MHz */
SPI_InitStructure.BaudRatePres  = SPI_BR_PRESCALER_8;
SPI_InitStructure.FirstBit    = SPI_FB_MSB;
SPI_InitStructure.CRCPoly    = 7;
SPI_Initializes(SPI_MASTER, &SPI_InitStructure);
SPI_SS_Output_Enable(SPI_MASTER);

/* SPI_SLAVE configuration ------------------------------------------------------*/
SPI_InitStructure.SpiMode = SPI_MODE_SLAVE;
SPI_InitStructure.DataDirection = SPI_DIR_SINGLELINE_RX;
SPI_Initializes(SPI_SLAVE, &SPI_InitStructure);

/* Enable the master and slave SPI interrupts ----------------------------------*/
SPI_I2S_Interrupts_Enable(SPI_MASTER, SPI_I2S_INT_TE);
SPI_I2S_Interrupts_Enable(SPI_SLAVE, SPI_I2S_INT_RNE);

/* Enable SPI_SLAVE */
SPI_ON(SPI_SLAVE);
/* Enable SPI_MASTER */
SPI_ON(SPI_MASTER);

只看该作者 · 2023-11-27 13:40

你能测到CS的波形吗？

只看该作者 · 2023-11-27 13:41

CS引脚是你字节控制的，有波形吗？

只看该作者 · 2023-11-27 13:45

uint8_t spi_transmit(uint8_t data)
{
uint8_t brxbuff;

SPI_I2S_Data_Transmit(SPI2, data);
while(SPI_I2S_Flag_Status_Get(SPI2, SPI_I2S_FLAG_TE) == RESET);
brxbuff = SPI_I2S_Data_Get(SPI2);
while(SPI_I2S_Flag_Status_Get(SPI2, SPI_I2S_FLAG_BUSY) != RESET) ;
return brxbuff;
}
你软件控制，首先拉低片选然后再发送啊，你这个发送里面也没有片选NSS的控制啊

只看该作者 · 2023-11-27 13:52

qintian0303 发表于 2023-11-27 13:45
uint8_t spi_transmit(uint8_t data)
{
uint8_t brxbuff;

这部分我在main里做的，大致是这样的
spi_cs_low();
spi_transmit(data);
spi_cs_high();

1万 · 2023-11-28 16:30

我来发言，既然你用的官方例程，一定要关注例程自带的IO口的初始化，PA9和PA10会在例程里被复用为串口。看看你的工程的文件夹：BSP下面有一个log.c，这里面会把PA9 PA10复用为串口，而初始化LOG在例程中是在你的SPI GPIO初始化后面。你的GPIO没生效。还有SPI这种发送接收的判断可能会卡在判断标志位的地方，注意debug查看