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STM32: Ethernet: Workaround for STM32_F767 revA 

On STM32 F767 rev A devices ,Ethernet peripheral had problems on RMII
interface, on MII this was not the case.

This commits implements a tentative workaround for the issue rerfered to
as Ethernet erroneous data received in RMII configuration in the Errata
sheet below:
http://www.st.com/content/ccc/resource/technical/document/errata_sheet/group0/23/a6/11/0b/30/24/46/a5/DM00257543/files/DM00257543.pdf/jcr:content/translations/en.DM00257543.pdf

Note that the issue has been fixed in 'Z' revision. of STM32 F767 MCUs.
pull/5411/head
Laurent MEUNIER 2017-10-31 18:00:47 +01:00
parent 7b2e9b1ad1
commit 96b4c36f0f
1 changed files with 36 additions and 0 deletions
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36
features/FEATURE_LWIP/lwip-interface/lwip-eth/arch/TARGET_STM/stm32xx_emac.c
View File

@ -46,6 +46,9 @@ static sys_mutex_t tx_lock_mutex;
/* function */
static void _eth_arch_rx_task(void *arg);
static void _eth_arch_phy_task(void *arg);
#if defined (TARGET_NUCLEO_F767ZI)
static void _rmii_watchdog(void *arg);
#endif
#if LWIP_IPV4
static err_t _eth_arch_netif_output_ipv4(struct netif *netif, struct pbuf *q, const ip4_addr_t *ipaddr);
@ -372,6 +375,35 @@ static void _eth_arch_phy_task(void *arg)
}
}
#if defined (TARGET_NUCLEO_F767ZI)
/**
* workaround for the ETH RMII bug in STM32F769 Cut1.0
*
* \param[in] netif the lwip network interface structure
*/
static void _rmii_watchdog(void *arg)
{
while(1) {
/* some good packets are received */
if (EthHandle.Instance->MMCRGUFCR > 0) {
/* RMII Init is OK - would need service to terminate or suspend
* the thread */
while(1) {
/* don't do anything anymore */
osDelay(0xFFFFFFFF);
}
} else if (EthHandle.Instance->MMCRFCECR > 10) {
/* ETH received too many packets with CRC errors, resetting RMII */
SYSCFG->PMC &= ~SYSCFG_PMC_MII_RMII_SEL;
SYSCFG->PMC |= SYSCFG_PMC_MII_RMII_SEL;
EthHandle.Instance->MMCCR |= ETH_MMCCR_CR;
} else {
osDelay(100);
}
}
}
#endif
/**
* This function is the ethernet IPv4 packet send function. It calls
* etharp_output after checking link status.
@ -465,6 +497,10 @@ err_t eth_arch_enetif_init(struct netif *netif)
/* initialize the hardware */
_eth_arch_low_level_init(netif);
#if defined (TARGET_NUCLEO_F767ZI)
sys_thread_new("stm32_rmii_watchdog", _rmii_watchdog, netif, DEFAULT_THREAD_STACKSIZE, osPriorityLow);
#endif
return ERR_OK;
}