SPI_I2S_ReceiveData始终返回0xff或0x00
我想创建stm32f4 discovery的固件,该固件在板移动时闪烁指示灯。但是SPI_I2S_ReceiveData始终返回0xff或0x00,c,embedded,stm32,C,Embedded,Stm32,我想创建stm32f4 discovery的固件,该固件在板移动时闪烁指示灯。但是SPI\u I2S\u ReceiveData总是返回0xff或0x00。我想问题出在我的SPI初始化中,但我不知道它到底在哪里 这是我的密码 #include <stm32f4xx.h> #include <stm32f4xx_rcc.h> #include <stm32f4xx_gpio.h> #include <stm32f4xx_spi.h> #include
SPI\u I2S\u ReceiveData
总是返回0xff或0x00。我想问题出在我的SPI初始化中,但我不知道它到底在哪里
这是我的密码
#include <stm32f4xx.h>
#include <stm32f4xx_rcc.h>
#include <stm32f4xx_gpio.h>
#include <stm32f4xx_spi.h>
#include <stm32f4xx_i2c.h>
void InitLEDs(void);
void InitSPI(void);
void Delay(int iTicks);
void DiodeFlash(void);
unsigned short ReadACCELEROMETER(void);
unsigned char WriteSPI(unsigned char cbData);
int main(void)
{
unsigned short cbPrevRead = 0;
unsigned short cbCurrentRead = 0;
InitLEDs();
InitSPI();
while(1)
{
cbCurrentRead = ReadACCELEROMETER();
if (cbCurrentRead != cbPrevRead)
{
DiodeFlash();
cbPrevRead = cbCurrentRead;
}
}
}
void InitLEDs(void)
{
GPIO_InitTypeDef PortD;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
PortD.GPIO_Mode = GPIO_Mode_OUT;
PortD.GPIO_OType = GPIO_OType_PP;
PortD.GPIO_PuPd = GPIO_PuPd_NOPULL;
PortD.GPIO_Speed = GPIO_Speed_100MHz;
PortD.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
GPIO_Init(GPIOD, &PortD);
}
void InitSPI(void)
{
GPIO_InitTypeDef PortA;
GPIO_InitTypeDef PortE;
SPI_InitTypeDef SPI1Conf;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOE, ENABLE);
PortA.GPIO_Mode = GPIO_Mode_AF;
PortA.GPIO_OType = GPIO_OType_PP;
PortA.GPIO_Speed = GPIO_Speed_50MHz;
PortA.GPIO_PuPd = GPIO_PuPd_NOPULL;
PortA.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
GPIO_Init(GPIOA, &PortA);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_SPI1);
PortE.GPIO_Mode = GPIO_Mode_OUT;
PortE.GPIO_OType = GPIO_OType_PP;
PortE.GPIO_Speed = GPIO_Speed_50MHz;
PortE.GPIO_PuPd = GPIO_PuPd_NOPULL;
PortE.GPIO_Pin = GPIO_Pin_3;
GPIO_Init(GPIOE, &PortE);
GPIOE->ODR = 0x0008; // Disable CS
SPI1Conf.SPI_DataSize = SPI_DataSize_8b;
SPI1Conf.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_64;
SPI1Conf.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI1Conf.SPI_FirstBit = SPI_FirstBit_MSB; // ACCELEROMETER PROTOCOL
SPI1Conf.SPI_Mode = SPI_Mode_Master;
SPI1Conf.SPI_CPHA = SPI_CPHA_2Edge;
SPI1Conf.SPI_CPOL = SPI_CPOL_High;
SPI1Conf.SPI_CRCPolynomial = 7;
SPI1Conf.SPI_NSS = SPI_NSS_Soft;
SPI_Init(SPI1, &SPI1Conf);
SPI_Cmd(SPI1, ENABLE);
WriteSPI(0x23); WriteSPI(0xc9);
WriteSPI(0x20); WriteSPI(0x97);
WriteSPI(0x24); WriteSPI(0x00);
WriteSPI(0x10); WriteSPI(0x00);
WriteSPI(0x11); WriteSPI(0x00);
WriteSPI(0x12); WriteSPI(0x00);
}
void Delay(int iTicks)
{
while ((iTicks--) > 0);
}
void DiodeFlash(void)
{
GPIO_Write(GPIOD, 1UL << 12);
Delay(100000);
GPIO_Write(GPIOD, 1UL << 13);
Delay(100000);
GPIO_Write(GPIOD, 1UL << 14);
Delay(100000);
GPIO_Write(GPIOD, 1UL << 15);
Delay(100000);
GPIO_Write(GPIOD, 0x0000);
}
unsigned short ReadACCELEROMETER(void)
{
unsigned short nAxisX = 0x0000;
unsigned short nAxisY = 0x0000;
unsigned short nAxisZ = 0x0000;
unsigned char cbAddress = 0x80;
//**********************************************************
// Forming X Value
WriteSPI(cbAddress | 0x0f);
nAxisX |= WriteSPI(0x00);
WriteSPI(cbAddress | 0x2A);
nAxisX |= WriteSPI(0x00) << 8;
//**********************************************************
// Forming Y Value
WriteSPI(cbAddress | 0x2B);
nAxisX |= WriteSPI(0x00);
WriteSPI(cbAddress | 0x2C);
nAxisX |= WriteSPI(0x00) << 8;
//**********************************************************
// Forming Z Value
WriteSPI(cbAddress | 0x2D);
nAxisX |= WriteSPI(0x00);
WriteSPI(cbAddress | 0x2E);
nAxisX |= WriteSPI(0x00) << 8;
return nAxisX ^ nAxisY ^ nAxisZ;
}
unsigned char WriteSPI(unsigned char cbData)
{
unsigned char cbResult = 0x00;
GPIOE->ODR = 0x0000; // Enable CS
// Wait for ready status
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) == SET);
SPI_I2S_SendData(SPI1, cbData);
// Wait for ready status
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) == SET);
cbResult = SPI_I2S_ReceiveData(SPI1);
GPIOE->ODR = 0x0008; // Disable CS
return cbResult;
}
#包括
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void(void);
void InitSPI(void);
无效延迟(int iTicks);
void-DiodeFlash(void);
未签名的短消息(无效);
unsigned char WriteSPI(unsigned char cbData);
内部主(空)
{
无符号短cbPrevRead=0;
无符号短cbCurrentRead=0;
initled();
InitSPI();
而(1)
{
cbCurrentRead=ReadAccelerator();
如果(cbCurrentRead!=cbPrevRead)
{
二极管闪光();
cbPrevRead=cbCurrentRead;
}
}
}
void initled(void)
{
GPIO_InitTypeDef端口d;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD,启用);
PortD.GPIO_Mode=GPIO_Mode_OUT;
PortD.GPIO_OType=GPIO_OType_PP;
PortD.GPIO_PuPd=GPIO_PuPd_NOPULL;
端口D.GPIO_速度=GPIO_速度_100MHz;
端口D.GPIO_引脚=GPIO_引脚12 | GPIO_引脚13 | GPIO_引脚14 | GPIO_引脚15;
GPIO_Init(GPIOD和PortD);
}
void InitSPI(void)
{
GPIO_InitTypeDef PortA;
GPIO_初始化类型定义端口;
SPI_InitTypeDef SPI1Conf;
RCC_APB2PeriphLockCmd(RCC_APB2Periph_SPI1,启用);
RCC_AHB1PeriphLockCmd(RCC_AHB1Periph_GPIOA,启用);
RCC_AHB1PeriphLockCmd(RCC_AHB1Periph_GPIOE,启用);
PortA.GPIO_Mode=GPIO_Mode_AF;
PortA.GPIO_OType=GPIO_OType_PP;
PortA.GPIO_速度=GPIO_速度50MHz;
PortA.GPIO_PuPd=GPIO_PuPd_NOPULL;
PortA.GPIO_Pin=GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
GPIO_Init(GPIOA和PortA);
GPIO_PinAFConfig(GPIOA、GPIO_PinSource5、GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOA、GPIO_PinSource6、GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOA、GPIO_PinSource7、GPIO_AF_SPI1);
PortE.GPIO_Mode=GPIO_Mode_OUT;
PortE.GPIO_OType=GPIO_OType_PP;
PortE.GPIO_速度=GPIO_速度_50MHz;
PortE.GPIO_PuPd=GPIO_PuPd_NOPULL;
PortE.GPIO_Pin=GPIO_Pin_3;
GPIO_Init(GPIOE和端口);
GPIOE->ODR=0x0008;//禁用CS
SPI1Conf.SPI_DataSize=SPI_DataSize_8b;
SPI1Conf.SPI_波特率预分频器=SPI_波特率预分频器_64;
SPI1Conf.SPI_方向=SPI_方向线全双工;
SPI1Conf.SPI_FirstBit=SPI_FirstBit_MSB;//加速计协议
SPI1Conf.SPI_Mode=SPI_Mode_Master;
SPI1Conf.SPI_CPHA=SPI_CPHA_2Edge;
SPI1Conf.SPI_CPOL=SPI_CPOL_高;
SPI1Conf.SPI_crcpolymonal=7;
SPI1Conf.SPI_NSS=SPI_NSS_Soft;
SPI_Init(SPI1和SPI1Conf);
SPI_Cmd(SPI1,启用);
WriteSPI(0x23);WriteSPI(0xc9);
WriteSPI(0x20);WriteSPI(0x97);
WriteSPI(0x24);WriteSPI(0x00);
WriteSPI(0x10);WriteSPI(0x00);
WriteSPI(0x11);WriteSPI(0x00);
WriteSPI(0x12);WriteSPI(0x00);
}
无效延迟(int iTicks)
{
而((iTicks--)>0);
}
无效二极管闪光(无效)
{
GPIO_Write(GPIOD,1UL首先,您没有指定您的加速计。我可以猜测,它是ST LISxx。
在这种情况下,向加速计传输的数据不正确
正确的写入顺序:
-激活芯片选择
-写入寄存器编号
-写入寄存器值
-停用芯片选择
使用类似的顺序读取每个寄存器
接下来,ST不建议您的algo用于低级SPI传输:
不要使用BSY标志来处理每个数据传输或接收。最好使用TXE和RXNE标志
(参见参考手册)。使用简单
SPIx->DR = out;
while (!(SPIx->SR & SPI_SR_RXNE)) ;
return SPIx->DR;
此外,我正在使用具有CPOL=0和CPHA=0 SPI设置的LIS3DH(我不知道它将如何与您的CPOL=1、CPHA=1一起工作)
提示:要检查SPI通信,请尝试读取我注册的用户-它已启用并且始终具有已知值。首先,您不指定加速计。我可以猜测,它是ST LISxx。
在这种情况下,向加速计传输的数据不正确
正确的写入顺序:
-激活芯片选择
-写入寄存器编号
-写入寄存器值
-停用芯片选择
使用类似的顺序读取每个寄存器
接下来,ST不建议您的algo用于低级SPI传输:
不要使用BSY标志来处理每个数据传输或接收。最好使用TXE和RXNE标志
(参见参考手册)。使用简单
SPIx->DR = out;
while (!(SPIx->SR & SPI_SR_RXNE)) ;
return SPIx->DR;
此外,我正在使用具有CPOL=0和CPHA=0 SPI设置的LIS3DH(我不知道它将如何与您的CPOL=1、CPHA=1一起工作)
提示:若要检查SPI通信,请尝试读取谁是我的寄存器-它已启用并且始终具有已知值。这是因为您在取消选择设备后写入了寄存器的地址,所以写入的地址将被清除。在这种情况下,您必须执行类似操作
unsigned char WriteSPI(unsigned char cbData)
{
unsigned char cbResult = 0x00;
// Wait for ready status
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) == SET);
SPI_I2S_SendData(SPI1, cbData);
// Wait for ready status
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) == SET);
cbResult = SPI_I2S_ReceiveData(SPI1);
return cbResult;
}
unsigned char WriteReg(unsigned char cbAddress, unsigned char cbData)
{
unsigned char cbResult = 0x00;
GPIOE->ODR = 0x0000; // select device
WriteSPI(cbAddress);
cbResult = WriteSPI(cbData);
GPIOE->ODR = 0x0008; // deselect device
return cbResult;
}
unsigned char ReadReg(unsigned char cbAddress)
{
unsigned char cbResult = 0x00;
GPIOE->ODR = 0x0000; // select device
WriteSPI(cbAddress);
cbResult = WriteSPI(0x00);
GPIOE->ODR = 0x0008; // deselect device
return cbResult;
}
这是因为在取消选择设备后,您写入了寄存器的地址,所以写入的地址是清除的。在这种情况下,您必须这样做
unsigned char WriteSPI(unsigned char cbData)
{
unsigned char cbResult = 0x00;
// Wait for ready status
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) == SET);
SPI_I2S_SendData(SPI1, cbData);
// Wait for ready status
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) == SET);
cbResult = SPI_I2S_ReceiveData(SPI1);
return cbResult;
}
unsigned char WriteReg(unsigned char cbAddress, unsigned char cbData)
{
unsigned char cbResult = 0x00;
GPIOE->ODR = 0x0000; // select device
WriteSPI(cbAddress);
cbResult = WriteSPI(cbData);
GPIOE->ODR = 0x0008; // deselect device
return cbResult;
}
unsigned char ReadReg(unsigned char cbAddress)
{
unsigned char cbResult = 0x00;
GPIOE->ODR = 0x0000; // select device
WriteSPI(cbAddress);
cbResult = WriteSPI(0x00);
GPIOE->ODR = 0x0008; // deselect device
return cbResult;
}
SPI初始化没有问题。主要错误是写入寄存器地址。在读取寄存器值之前,不能取消选择设备,而必须在一批中执行写入地址-读取值。这意味着
选择设备
写入寄存器地址
读取寄存器值
取消选择设备
SPI初始化没有问题。主要错误是写入寄存器地址。在读取寄存器值之前,不能取消选择设备,而必须在一批中执行写入地址-读取值。这意味着
选择设备
写入寄存器地址
读取寄存器值
取消选择设备
STLib太长了,读不下去了。“神奇数字”的出现是一个显而易见的问题。我猜你是在读一个浮动输入。TL;DR;一般建议:不要使用那个膨胀的STLib,而是去硬件。