发送时，采取的函数为HAL_SPI_Transmit_IT()；
接收时，由于不知道对方发过来的报文长度，
就不知道用什么函数。厂家提供的软件包里面的receive函数都需要
指定size长度。
下面的代码中，我在最开始开启SPI_IT_RXNE中断使能。
通过中断函数和数据处理函数来解析报文。并把报文上传网络服务器。
但是ARM SPI接收不到数据。不知道为啥？
本代码为SPI主机的。
/* SPI5 init function */
void MX_SPI5_Init(void)
{
hspi5.Instance = SPI5;
hspi5.Init.Mode = SPI_MODE_MASTER;
hspi5.Init.Direction = SPI_DIRECTION_2LINES;
hspi5.Init.DataSize = SPI_DATASIZE_8BIT;
hspi5.Init.CLKPolarity = SPI_POLARITY_LOW;
hspi5.Init.CLKPhase = SPI_PHASE_1EDGE;
hspi5.Init.NSS = SPI_NSS_SOFT;
hspi5.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_4;
hspi5.Init.FirstBit = SPI_FIRSTBIT_MSB;
hspi5.Init.TIMode = SPI_TIMODE_DISABLED;
hspi5.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLED;
HAL_SPI_Init(&hspi5);
}
/**
- @brief Initializes the SPI according to the specified parameters
- in the SPI_InitTypeDef and create the associated handle.
- @param hspi: pointer to a SPI_HandleTypeDef structure that contains
- the configuration information for SPI module.
- @retval HAL status */ HAL_StatusTypeDef HAL_SPI_Init(SPI_HandleTypeDef *hspi) { ..... HAL_SPI_MspInit(hspi); ...... }
void HAL_SPI_MspInit(SPI_HandleTypeDef* hspi)
{
GPIO_InitTypeDef GPIO_InitStruct;
if(hspi->Instance==SPI4)
{
/* Peripheral clock enable */
__SPI4_CLK_ENABLE();
/**SPI4 GPIO Configuration
PE2 ------> SPI4_SCK
PE5 ------> SPI4_MISO
PE6 ------> SPI4_MOSI
*/
GPIO_InitStruct.Pin = GPIO_PIN_2|GPIO_PIN_5|GPIO_PIN_6;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_LOW;
GPIO_InitStruct.Alternate = GPIO_AF5_SPI4;
HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);
}
if(hspi->Instance==SPI5)
{
/* Peripheral clock enable /
__SPI5_CLK_ENABLE();
/*SPI5 GPIO Configuration
PF7 ------> SPI5_SCK
PF8 ------> SPI5_MISO
PF9 ------> SPI5_MOSI
*/
GPIO_InitStruct.Pin = GPIO_PIN_7|GPIO_PIN_8|GPIO_PIN_9;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_LOW;
GPIO_InitStruct.Alternate = GPIO_AF5_SPI5;
HAL_GPIO_Init(GPIOF, &GPIO_InitStruct);
}
}
main()
{
MX_SPI5_Init();
__HAL_SPI_ENABLE_IT(&hspi5, SPI_IT_RXNE);
while (1)
{
SPI5_Master_Rx(); //读取从机发过来的数据。
}
}
typedef uint8_t u8 ;
typedef uint16_t u16 ;
typedef uint32_t u32 ;
u8 hmosi[50]={0};
u8 mosi1[50]={0};
u8 phmosi[50]={0};
u32 imosi=0;
u32 spi5_rx_len;
u32 ic=0;
#define comsize 8
extern u16 tSession;
u32 udata_len_spi;
extern u16 ports[comsize+1];
extern u32 uTimeLst;
extern SPI_HandleTypeDef hspi5;
void SPI5_IRQHandler(void)
{
if(__HAL_SPI_GET_FLAG(&hspi5, SPI_FLAG_RXNE) == SET)
{
hmosi[imosi++]=(uint8_t)(hspi5.Instance->DR);
}
}
void SPI5_Master_Rx(void)
{
//for(;imosi>=(ic+7);ic++)
for(;imosi>=(ic+5);ic++)
{
if((0x2e==hmosi[ic])&&(0x17==hmosi[ic+1])&&(0x0==hmosi[ic+2]))
{
spi5_rx_len=hmosi[ic+6];
udata_len_spi = spi5_rx_len+1;
memset(phmosi,0x00,udata_len_spi);
phmosi[5]=hmosi[ic+5];
phmosi[6]=spi5_rx_len-7;
memcpy(phmosi+7,hmosi+ic+7,spi5_rx_len-7);
memcpy(mosi1,hmosi+ic,50-ic);
memcpy(hmosi,mosi1,50-ic);
imosi=imosi-ic;
ic=0;
//**************************
tSession++;
phmosi[0]=0x2e;
phmosi[1]=0x17;
phmosi[2]=0x00;
phmosi[3]=tSession;
phmosi[4]=(tSession>>8);
//memcpy(udata+7,tx1_buf,rx1cnt);
phmosi[udata_len_spi-1] = crc(phmosi,udata_len_spi-1,1);
com2net(ports[0],udata_len_spi,phmosi);
uTimeLst=HAL_GetTick();
}
}
}
