Bit RFWRA in register MACDBGR is never set!!!!!!

Posted on November 15, 2016 at 05:56

Hi!

I have LAN8720, STM32F4DISCOVERY, CP2102

I connected PC-LAN8720, LAN8720-STM32F4DISC, STM32F4DISC-CP2102, CP2102-PC.

I wrote such program for STM32F407:

//Ethernet

/*******************************************************************/

//pc6-usart6_tx,pc7-usart6_rx

//pb13-tx1, pb11-txen, pb12-tx0, pc4-rx0, pc5-rx1, pa1-refclk, pa7-crs, pa2-mdio,pc1-mdc

#include ''stm32f4xx.h''

uint32_t i, temp;

int main()

{

//config clock

RCC->CR=(RCC_CR_HSEON|RCC_CR_PLLON|RCC_CR_CSSON);//extern quartz,pll,(|

RCC->PLLCFGR=0x00005408;//n=210, m=10, hs=8 MHz

//RCC->CFGR=(RCC_CFGR_SW_PLL|RCC_CFGR_SWS_PLL|RCC_CFGR_MCO1);//mco1,system clock from PLL

RCC->CFGR=0x0760940A;

while (!(RCC->CR&0x02000000));

//enable gpio, usart6, mac

RCC->AHB1ENR=(RCC_AHB1ENR_ETHMACRXEN|RCC_AHB1ENR_ETHMACTXEN|RCC_AHB1ENR_ETHMACEN|RCC_AHB1ENR_GPIOAEN|RCC_AHB1ENR_GPIOBEN|RCC_AHB1ENR_GPIOCEN|RCC_AHB1ENR_GPIODEN);//vkl takt port a-d,mac

RCC->APB2ENR=(RCC_APB2ENR_SYSCFGEN|RCC_APB2ENR_USART6EN);

//config type GPIO

GPIOA->MODER|=(GPIO_MODER_MODER1_1|GPIO_MODER_MODER2_1|GPIO_MODER_MODER7_1|GPIO_MODER_MODER8_1);

GPIOB->MODER|=(GPIO_MODER_MODER12_1|GPIO_MODER_MODER13_1|GPIO_MODER_MODER15_1);

GPIOC->MODER=(GPIO_MODER_MODER1_1|GPIO_MODER_MODER4_1|GPIO_MODER_MODER5_1|GPIO_MODER_MODER6_1|GPIO_MODER_MODER7_1);

GPIOD->MODER=0x55000000;//VIVODI PD15-PD12 - VIHOD

//config altern func

GPIOA->AFR[0]=0xB0000BB0;//mac

GPIOB->AFR[1]=0xB0BB0000;//mac

GPIOC->AFR[0]=0x88BB00B0;//PC6,PC7-USART6,mac

//conf usart6

//USART6->BRR=0x0341;//0x0341,8 MHz to 9600 bps

USART6->BRR=0x8b;//8 MHz to 115200 bps

USART6->CR1|=(USART_CR1_OVER8|USART_CR1_RE|USART_CR1_TE|USART_CR1_UE);//over8=1,UE,TE,RE

//set rmii interface

SYSCFG->PMC=SYSCFG_PMC_MII_RMII_SEL;

//config LAN8720

ETH->MACMIIDR=0x00001000;//auto-negotiation

ETH->MACMIIAR=0x00000803;//adr=1, reg=0,write

while (ETH->MACMIIAR==0x00000803);

for (i=0;i<10;i++);

while (1)

{

ETH->MACMIIAR=0x00000841;//adr=1, reg=1,read

while (ETH->MACMIIAR==0x00000841);

while (!(ETH->MACMIIDR&0x0004))//link is up?

{//no

ETH->MACMIIAR=0x00000841;//adr=1, reg=1,read

  while (ETH->MACMIIAR==0x00000841);

GPIOD->ODR=0x00004000;

}

GPIOD->ODR=0x00001000;//yes

for (i=0;i<10000;i++);

GPIOD->ODR=0x00000000;//yes

//out reg 1

temp=ETH->MACMIIDR;

USART6->DR=temp;

while (!(USART6->SR&USART_SR_TXE));

temp=temp>>8;

USART6->DR=temp;

while (!(USART6->SR&USART_SR_TXE));

ETH->MACMIIAR=0x00000fc1;//adr=1, reg=31,read

while (ETH->MACMIIAR==0x00000fc1);

//out reg31

temp=ETH->MACMIIDR;

USART6->DR=temp;

while (!(USART6->SR&USART_SR_TXE));

temp=temp>>8;

USART6->DR=temp;

while (!(USART6->SR&USART_SR_TXE));

//config MAC

ETH->MACCR=0x02008080;//crsc strip, pad/crc strip

switch(ETH->MACMIIDR)

{

case 0x1044:ETH->MACCR|=0x00008000;//10,h

break;

case 0x1054:ETH->MACCR|=0x00008800;//10,f

break;

  case 0x1048:ETH->MACCR|=0x0000c000;//100,h

break;

  case 0x1058:ETH->MACCR|=0x0000c800;//100,f

break;

default: GPIOD->ODR=0x00004000;

while (1);

break;

}

ETH->MACCR|=0x00000004;//re

GPIOD->ODR=0x00001000;

//out MACCR

temp=ETH->MACCR;

USART6->DR=temp;

while (!(USART6->SR&USART_SR_TXE));

temp=temp>>8;

USART6->DR=temp;

while (!(USART6->SR&USART_SR_TXE));

temp=temp>>8;

USART6->DR=temp;

while (!(USART6->SR&USART_SR_TXE));

temp=temp>>8;

USART6->DR=temp;

while (!(USART6->SR&USART_SR_TXE));

while (!(ETH->MACDBGR&0x00000010))

{

GPIOD->ODR=0x00008000;//yes

}

GPIOD->ODR=0x00001000;//yes

while (1);

//out MACDBGR

temp=ETH->MACDBGR;

USART6->DR=temp;

while (!(USART6->SR&USART_SR_TXE));

temp=temp>>8;

USART6->DR=temp;

while (!(USART6->SR&USART_SR_TXE));

temp=temp>>8;

USART6->DR=temp;

while (!(USART6->SR&USART_SR_TXE));

temp=temp>>8;

USART6->DR=temp;

while (!(USART6->SR&USART_SR_TXE));

}

}

There are right impulses on pins rx0, rx1, refclk, crs on LAN8720.

In docklight I saw 2d 78 58 10 84 C8 00 02. (Link is up in LAN8720, speed and mode of ethernet are defined).

Why is bit RFWRA in register MACDBGR not set? What is wrong?

Thank You!