STM32F207+DP83848+RT-THREAD 네트워크 플러그 재연결 시험 실현
9338 단어 rt-thread 학습
1. DP83848을 통해 링크의 상태 변화로 설정하면 해당 교회에 전기 평형 변화(구체적으로 보면 매뉴얼)가 있어 STM32의 외부 중단을 촉발하고 STM32 네트워크 상태를 알린다.다음은 PHY 구성
/************************************************************
** DP83848 MCU。
*************************************************************/
uint32_t Eth_Link_PHYITConfig(uint16_t PHYAddress)
{
/* PHY registers */
uint32_t tmpreg = 0;
tmpreg = ETH_ReadPHYRegister(PHYAddress, 2);
tmpreg = ETH_ReadPHYRegister(PHYAddress, 3);
/* Read MICR register */
tmpreg = ETH_ReadPHYRegister(PHYAddress, PHY_MICR);
/* Enable output interrupt events to signal via the INT pin */
tmpreg |= (uint32_t)PHY_MICR_INT_EN | PHY_MICR_INT_OE;
if(!(ETH_WritePHYRegister(PHYAddress, PHY_MICR, tmpreg)))
{
/* Return ERROR in case of write timeout */
return ETH_ERROR;
}
/* Read MISR register */
tmpreg = ETH_ReadPHYRegister(PHYAddress, PHY_MISR);
/* Enable Interrupt on change of link status */
tmpreg |= (uint32_t)PHY_MISR_LINK_INT_EN;
if(!(ETH_WritePHYRegister(PHYAddress, PHY_MISR, tmpreg)))
{
/* Return ERROR in case of write timeout */
return ETH_ERROR;
}
/* Return SUCCESS */
return ETH_SUCCESS;
}2. 코드는 STM32를 구성하는 파이프라인이 내려가면서 터치 인터럽트를 일으킨다.
/***********************************************************
*** GPIOA3 ， MCU 。
************************************************************/
void Eth_Link_EXTIConfig(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
/* Enable the INT (PB14) Clock */
RCC_AHB1PeriphClockCmd(ETH_LINK_GPIO_CLK, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
/* Configure INT pin as input */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Pin = ETH_LINK_PIN;
GPIO_Init(ETH_LINK_GPIO_PORT, &GPIO_InitStructure);
/* Connect EXTI Line to INT Pin */
SYSCFG_EXTILineConfig(ETH_LINK_EXTI_PORT_SOURCE, ETH_LINK_EXTI_PIN_SOURCE);
/* Configure EXTI line */
EXTI_InitStructure.EXTI_Line = ETH_LINK_EXTI_LINE;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
/* Enable and set the EXTI interrupt to the highest priority */
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
NVIC_InitStructure.NVIC_IRQChannel = EXTI3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}MAC
및
DMA
관련 초기화 코드(이 부분의 초기화는 우리가 시스템을 시작할 때 이미 초기화했다)
4
static void ETH_MACDMA_Config(void)
{
ETH_InitTypeDef ETH_InitStructure;
/* Enable ETHERNET clock */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_ETH_MAC | RCC_AHB1Periph_ETH_MAC_Tx |
RCC_AHB1Periph_ETH_MAC_Rx, ENABLE);
/* Reset ETHERNET on AHB Bus */
ETH_DeInit();
/* Software reset */
ETH_SoftwareReset();
/* Wait for software reset */
while (ETH_GetSoftwareResetStatus() == SET);
/* ETHERNET Configuration --------------------------------------------------*/
/* Call ETH_StructInit if you don't like to configure all ETH_InitStructure parameter */
ETH_StructInit(Ð_InitStructure);
/* Fill ETH_InitStructure parametrs */
/*------------------------ MAC -----------------------------------*/
ETH_InitStructure.ETH_AutoNegotiation = ETH_AutoNegotiation_Enable;
//ETH_InitStructure.ETH_AutoNegotiation = ETH_AutoNegotiation_Disable;
// ETH_InitStructure.ETH_Speed = ETH_Speed_10M;
// ETH_InitStructure.ETH_Mode = ETH_Mode_FullDuplex;
ETH_InitStructure.ETH_LoopbackMode = ETH_LoopbackMode_Disable;
ETH_InitStructure.ETH_RetryTransmission = ETH_RetryTransmission_Disable;
ETH_InitStructure.ETH_AutomaticPadCRCStrip = ETH_AutomaticPadCRCStrip_Disable;
ETH_InitStructure.ETH_ReceiveAll = ETH_ReceiveAll_Disable;
ETH_InitStructure.ETH_BroadcastFramesReception = ETH_BroadcastFramesReception_Enable;
ETH_InitStructure.ETH_PromiscuousMode = ETH_PromiscuousMode_Disable;
ETH_InitStructure.ETH_MulticastFramesFilter = ETH_MulticastFramesFilter_Perfect;
ETH_InitStructure.ETH_UnicastFramesFilter = ETH_UnicastFramesFilter_Perfect;
#ifdef CHECKSUM_BY_HARDWARE
ETH_InitStructure.ETH_ChecksumOffload = ETH_ChecksumOffload_Enable;
#endif
/*------------------------ DMA -----------------------------------*/
/* When we use the Checksum offload feature, we need to enable the Store and Forward mode:
the store and forward guarantee that a whole frame is stored in the FIFO, so the MAC can insert/verify the checksum,
if the checksum is OK the DMA can handle the frame otherwise the frame is dropped */
ETH_InitStructure.ETH_DropTCPIPChecksumErrorFrame = ETH_DropTCPIPChecksumErrorFrame_Enable;
ETH_InitStructure.ETH_ReceiveStoreForward = ETH_ReceiveStoreForward_Enable;
ETH_InitStructure.ETH_TransmitStoreForward = ETH_TransmitStoreForward_Enable;
ETH_InitStructure.ETH_ForwardErrorFrames = ETH_ForwardErrorFrames_Disable;
ETH_InitStructure.ETH_ForwardUndersizedGoodFrames = ETH_ForwardUndersizedGoodFrames_Disable;
ETH_InitStructure.ETH_SecondFrameOperate = ETH_SecondFrameOperate_Enable;
ETH_InitStructure.ETH_AddressAlignedBeats = ETH_AddressAlignedBeats_Enable;
ETH_InitStructure.ETH_FixedBurst = ETH_FixedBurst_Enable;
ETH_InitStructure.ETH_RxDMABurstLength = ETH_RxDMABurstLength_32Beat;
ETH_InitStructure.ETH_TxDMABurstLength = ETH_TxDMABurstLength_32Beat;
ETH_InitStructure.ETH_DMAArbitration = ETH_DMAArbitration_RoundRobin_RxTx_2_1;
/* Configure Ethernet */
if( ETH_Init(Ð_InitStructure, DP83848_PHY_ADDRESS) == ETH_ERROR )
rt_kprintf("ETH init error, may be no link
");
{
/* Configure the PHY to generate an interrupt on change of link status */
Eth_Link_PHYITConfig(DP83848_PHY_ADDRESS);
/* Configure the EXTI for Ethernet link status. */
Eth_Link_EXTIConfig();
}
/* Enable the Ethernet Rx Interrupt */
ETH_DMAITConfig(ETH_DMA_IT_NIS | ETH_DMA_IT_R , ENABLE);
}DMA
패브릭 초기화 및 ENIC:
static rt_err_t rt_stm32_eth_init(rt_device_t dev)
{
int i;
/* MAC address configuration */
ETH_MACAddressConfig(ETH_MAC_Address0, (u8*)&stm32_eth_device.dev_addr[0]);
/* Initialize Tx Descriptors list: Chain Mode */
ETH_DMATxDescChainInit(DMATxDscrTab, &Tx_Buff[0][0], ETH_TXBUFNB);
/* Initialize Rx Descriptors list: Chain Mode */
ETH_DMARxDescChainInit(DMARxDscrTab, &Rx_Buff[0][0], ETH_RXBUFNB);
/* Enable Ethernet Rx interrrupt */
{
for(i=0; i이상의 코드는 모두 초기화 같은 것이고 아무것도 아니다. 다음은 네트워크 핫플러그 기능을 실현하는 주요 함수이다.
/**********************************************
** ，
** MAC DMA。
**********************************************/
void Eth_Link_ITHandler(uint16_t PHYAddress)
{
/* Check whether the link interrupt has occurred or not */
if(((ETH_ReadPHYRegister(PHYAddress, PHY_MISR)) & PHY_LINK_STATUS) != 0)
{
uint16_t status = ETH_ReadPHYRegister(PHYAddress, PHY_BSR);
if(status & (PHY_AutoNego_Complete | PHY_Linked_Status)){
init_dma_mac();// MAC DMA
rt_kprintf("qqx enter net_link is connect.
\r");
}
else{
rt_kprintf("qqx enter net_link is out
\r");
}
}
}// MAC DMA
void init_dma_mac(void)
{
rt_device_t stm32_eth_device;
ETH_MACDMA_Config();
stm32_eth_device = rt_device_find("e0");
rt_stm32_eth_init(stm32_eth_device);
}/*************************************************
**MCU ， STM32
** 。
*************************************************/
void EXTI3_IRQHandler(void)
{
if(EXTI_GetITStatus(ETH_LINK_EXTI_LINE) != RESET)
{
Eth_Link_ITHandler(DP83848_PHY_ADDRESS);
/* Clear interrupt pending bit */
EXTI_ClearITPendingBit(ETH_LINK_EXTI_LINE);
}
}전체적인 단계는: 인터럽트에 들어간 후 Eth 호출Link_ITHandler(DP83848_PHY_ADDRESS); ->
(1)ETH_MACDMA_Config();
(2)rt_stm32_eth_init(stm32_eth_device);//장치 찾기 함수를 통해 "e0 (자신의 실제 이름에 따라)"장치를 찾아서 이 네트워크 장치를 초기화합니다.
이렇게 하면 케이블이 언제 꽂히든지 연결되어 핫플러그 문제를 완벽하게 해결할 수 있다.
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