Hi. I am trying to bring to live TM4C1292 with external PHY with RGMII interface.
When EMACPHYConfigSet function gets to EMACReset function it sits in
while(HWREG(ui32Base + EMAC_O_DMABUSMOD) & EMAC_DMABUSMOD_SWR)
{
}
.
In datasheet it is written: DMA Software Reset The software reset function is driven by this bit. The reset operation is completed only when all resets in all active clock domains are deasserted. It is essential that all the PHY input clocks are present for the software reset completion. The time of the software reset operation depends on the frequency of the slowest active clock.
0: Reset is completed. A value of 0 should be read before reprogramming any MAC registers after a reset.
1: MAC DMA Controller resets the logic and all internal registers of the MAC. It is cleared automatically after the reset operation has completed in all of the MAC clock domains.
I checked that external PHY is generating 50 MHz clock.
Also , do I understand correctly - "The reset operation is completed only when all resets in all active clock domains are deasserted'' means that no clock should be in reset state?
I also checked that Clock to EMAC and EPHY have not been enabled. SYSCTL.RCGCEMAC register reads 0.
I am using LWip so ethernet initialization is done with lwipinit function seen below
struct netif *
lwIPInit(uint32_t ui32SysClkHz, const uint8_t *pui8MAC, uint32_t ui32IPAddr,
uint32_t ui32NetMask, uint32_t ui32GWAddr, uint32_t ui32IPMode)
{
//
// Check the parameters.
//
#if LWIP_DHCP && LWIP_AUTOIP
ASSERT((ui32IPMode == IPADDR_USE_STATIC) ||
(ui32IPMode == IPADDR_USE_DHCP) ||
(ui32IPMode == IPADDR_USE_AUTOIP));
#elif LWIP_DHCP
ASSERT((ui32IPMode == IPADDR_USE_STATIC) ||
(ui32IPMode == IPADDR_USE_DHCP));
#elif LWIP_AUTOIP
ASSERT((ui32IPMode == IPADDR_USE_STATIC) ||
(ui32IPMode == IPADDR_USE_AUTOIP));
#else
ASSERT(ui32IPMode == IPADDR_USE_STATIC);
#endif
/*
* This is a work-around for EMAC initialization issues found on
* the TM4C129 devices. The bug number is:
* SDOCM00107378: NDK examples for EK-TM4C1294XL do not work
*
* The following disables the flash pre-fetch (if it is not already disabled).
* It is enable within the EMACSnow_emacStart() function.
*/
bool enablePrefetch = false;
uint32_t ui32FlashConf;
ui32FlashConf = HWREG(FLASH_CONF);
if ((ui32FlashConf & (FLASH_CONF_FPFOFF)) == false) {
enablePrefetch = true;
ui32FlashConf &= ~(FLASH_CONF_FPFON);
ui32FlashConf |= FLASH_CONF_FPFOFF;
HWREG(FLASH_CONF) = ui32FlashConf;
}
//
// Enable the ethernet peripheral.
//
MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_EMAC0);
MAP_SysCtlPeripheralReset(SYSCTL_PERIPH_EMAC0);
//
// Enable the internal PHY if it's present and we're being
// asked to use it.
//
if((EMAC_PHY_CONFIG & EMAC_PHY_TYPE_MASK) == EMAC_PHY_TYPE_INTERNAL)
{
//
// We've been asked to configure for use with the internal
// PHY. Is it present?
//
if(MAP_SysCtlPeripheralPresent(SYSCTL_PERIPH_EPHY0))
{
//
// Yes - enable and reset it.
//
MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_EPHY0);
MAP_SysCtlPeripheralReset(SYSCTL_PERIPH_EPHY0);
}
else
{
//
// Internal PHY is not present on this part so hang here.
//
while(1)
{
}
}
}
//
// Wait for the MAC to come out of reset.
//
while(!MAP_SysCtlPeripheralReady(SYSCTL_PERIPH_EMAC0))
{
}
//
// Enable all MII related pins
//
// Enable Peripheral Clocks
MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);
MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOG);
MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOK);
MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOM);
MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOP);
MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOQ);
// Configure the GPIO Pin Mux for PG5
// for EN0TXD1
MAP_GPIOPinConfigure(GPIO_PG5_EN0TXD1);
GPIOPinTypeEthernetMII(GPIO_PORTG_BASE, GPIO_PIN_5);
// Configure the GPIO Pin Mux for PG7
// for EN0RXDV
MAP_GPIOPinConfigure(GPIO_PG7_EN0RXDV);
GPIOPinTypeEthernetMII(GPIO_PORTG_BASE, GPIO_PIN_7);
// Configure the GPIO Pin Mux for PG3
// for EN0TXEN
MAP_GPIOPinConfigure(GPIO_PG3_EN0TXEN);
GPIOPinTypeEthernetMII(GPIO_PORTG_BASE, GPIO_PIN_3);
// Configure the GPIO Pin Mux for PQ5
// for EN0RXD0
MAP_GPIOPinConfigure(GPIO_PQ5_EN0RXD0);
GPIOPinTypeEthernetMII(GPIO_PORTQ_BASE, GPIO_PIN_5);
// Configure the GPIO Pin Mux for PG4
// for EN0TXD0
MAP_GPIOPinConfigure(GPIO_PG4_EN0TXD0);
GPIOPinTypeEthernetMII(GPIO_PORTG_BASE, GPIO_PIN_4);
// Configure the GPIO Pin Mux for PQ6
// for EN0RXD1
MAP_GPIOPinConfigure(GPIO_PQ6_EN0RXD1);
GPIOPinTypeEthernetMII(GPIO_PORTQ_BASE, GPIO_PIN_6);
// Configure the GPIO Pin Mux for PF2
// for EN0MDC
//WE USE SPI
MAP_GPIOPinConfigure(GPIO_PF2_EN0MDC);
GPIOPinTypeEthernetMII(GPIO_PORTF_BASE, GPIO_PIN_2);
// Configure the GPIO Pin Mux for PF3
// for EN0MDIO
//WE USE SPI
MAP_GPIOPinConfigure(GPIO_PF3_EN0MDIO);
GPIOPinTypeEthernetMII(GPIO_PORTF_BASE, GPIO_PIN_3);
//
// Configure for use with whichever PHY the user requires.
//
MAP_EMACPHYConfigSet(EMAC0_BASE, EMAC_PHY_TYPE_EXTERNAL_RMII);
//
// Initialize the MAC and set the DMA mode.
//
MAP_EMACInit(EMAC0_BASE, ui32SysClkHz,
EMAC_BCONFIG_MIXED_BURST | EMAC_BCONFIG_PRIORITY_FIXED,
4, 4, 0);
//
// Set MAC configuration options.
//
MAP_EMACConfigSet(EMAC0_BASE, (EMAC_CONFIG_FULL_DUPLEX |
EMAC_CONFIG_CHECKSUM_OFFLOAD |
EMAC_CONFIG_7BYTE_PREAMBLE |
EMAC_CONFIG_IF_GAP_96BITS |
EMAC_CONFIG_USE_MACADDR0 |
EMAC_CONFIG_SA_FROM_DESCRIPTOR |
EMAC_CONFIG_BO_LIMIT_1024),
(EMAC_MODE_RX_STORE_FORWARD |
EMAC_MODE_TX_STORE_FORWARD |
EMAC_MODE_TX_THRESHOLD_64_BYTES |
EMAC_MODE_RX_THRESHOLD_64_BYTES), 0);
//
// Program the hardware with its MAC address (for filtering).
//
MAP_EMACAddrSet(EMAC0_BASE, 0, (uint8_t *)pui8MAC);
//
// Save the network configuration for later use by the private
// initialization.
//
g_ui32IPMode = ui32IPMode;
g_ui32IPAddr = ui32IPAddr;
g_ui32NetMask = ui32NetMask;
g_ui32GWAddr = ui32GWAddr;
//
// Initialize lwIP. The remainder of initialization is done immediately if
// not using a RTOS and it is deferred to the TCP/IP thread's context if
// using a RTOS.
//
#if NO_SYS
lwIPPrivateInit(0);
#else
tcpip_init(lwIPPrivateInit, 0);
#endif
/*
* Turns ON the prefetch buffer if it was disabled in EMACSnow_NIMUInit
*/
if (enablePrefetch == true) {
ui32FlashConf = HWREG(FLASH_CONF);
ui32FlashConf &= ~(FLASH_CONF_FPFOFF);
ui32FlashConf |= FLASH_CONF_FPFON;
HWREG(FLASH_CONF) = ui32FlashConf;
}
return &g_sNetIF;
}
