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micropython/ports/stm32/network_wiznet5k.c
Damien George ce8262a164 stm32/modnetwork: Replace generic netif NIC polling with specific code. 
It doesn't work to tie the polling of an underlying NIC driver (eg to check
the NIC for pending Ethernet frames) with its associated lwIP netif.  This
is because most NICs are implemented with IRQs and don't need polling,
because there can be multiple lwIP netif's per NIC driver, and because it
restricts the use of the netif->state variable.  Instead the NIC should
have its own specific way of processing incoming Ethernet frame.

This patch removes this generic NIC polling feature, and for the only
driver that uses it (Wiznet5k) replaces it with an explicit call to the
poll function (which could eventually be improved by using a proper
external interrupt).
2019-06-03 17:14:34 +10:00

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2014-2018 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdio.h>
#include <string.h>
#include "py/runtime.h"
#include "py/mphal.h"
#include "spi.h"
#include "modnetwork.h"
#if MICROPY_PY_WIZNET5K && MICROPY_PY_LWIP
#include "lib/netutils/netutils.h"
#include "drivers/wiznet5k/ethernet/socket.h"
#include "lwip/err.h"
#include "lwip/dns.h"
#include "lwip/dhcp.h"
#include "netif/etharp.h"
#define TRACE_ETH_TX (0x0002)
#define TRACE_ETH_RX (0x0004)
/*******************************************************************************/
// Wiznet5k Ethernet driver in MACRAW mode
typedef struct _wiznet5k_obj_t {
mp_obj_base_t base;
mp_uint_t cris_state;
const spi_t *spi;
mp_hal_pin_obj_t cs;
mp_hal_pin_obj_t rst;
uint8_t eth_frame[1514];
uint32_t trace_flags;
struct netif netif;
struct dhcp dhcp_struct;
} wiznet5k_obj_t;
// Global object holding the Wiznet5k state
STATIC wiznet5k_obj_t wiznet5k_obj;
STATIC void wiznet5k_lwip_init(wiznet5k_obj_t *self);
STATIC void wiz_cris_enter(void) {
wiznet5k_obj.cris_state = MICROPY_BEGIN_ATOMIC_SECTION();
}
STATIC void wiz_cris_exit(void) {
MICROPY_END_ATOMIC_SECTION(wiznet5k_obj.cris_state);
}
STATIC void wiz_cs_select(void) {
mp_hal_pin_low(wiznet5k_obj.cs);
}
STATIC void wiz_cs_deselect(void) {
mp_hal_pin_high(wiznet5k_obj.cs);
}
STATIC void wiz_spi_read(uint8_t *buf, uint32_t len) {
HAL_StatusTypeDef status = HAL_SPI_Receive(wiznet5k_obj.spi->spi, buf, len, 5000);
(void)status;
}
STATIC void wiz_spi_write(const uint8_t *buf, uint32_t len) {
HAL_StatusTypeDef status = HAL_SPI_Transmit(wiznet5k_obj.spi->spi, (uint8_t*)buf, len, 5000);
(void)status;
}
STATIC void wiznet5k_init(void) {
// SPI configuration
SPI_InitTypeDef *init = &wiznet5k_obj.spi->spi->Init;
init->Mode = SPI_MODE_MASTER;
init->Direction = SPI_DIRECTION_2LINES;
init->DataSize = SPI_DATASIZE_8BIT;
init->CLKPolarity = SPI_POLARITY_LOW; // clock is low when idle
init->CLKPhase = SPI_PHASE_1EDGE; // data latched on first edge, which is rising edge for low-idle
init->NSS = SPI_NSS_SOFT;
init->BaudRatePrescaler = SPI_BAUDRATEPRESCALER_2; // clock freq = f_PCLK / this_prescale_value; Wiz820i can do up to 80MHz
init->FirstBit = SPI_FIRSTBIT_MSB;
init->TIMode = SPI_TIMODE_DISABLED;
init->CRCCalculation = SPI_CRCCALCULATION_DISABLED;
init->CRCPolynomial = 7; // unused
spi_init(wiznet5k_obj.spi, false);
mp_hal_pin_output(wiznet5k_obj.cs);
mp_hal_pin_output(wiznet5k_obj.rst);
// Reset the chip
mp_hal_pin_low(wiznet5k_obj.rst);
mp_hal_delay_ms(1); // datasheet says 2us
mp_hal_pin_high(wiznet5k_obj.rst);
mp_hal_delay_ms(150); // datasheet says 150ms
// Set physical interface callbacks
reg_wizchip_cris_cbfunc(wiz_cris_enter, wiz_cris_exit);
reg_wizchip_cs_cbfunc(wiz_cs_select, wiz_cs_deselect);
reg_wizchip_spi_cbfunc(wiz_spi_read, wiz_spi_write);
// Configure 16k buffers for fast MACRAW
uint8_t sn_size[16] = {16, 0, 0, 0, 0, 0, 0, 0, 16, 0, 0, 0, 0, 0, 0, 0};
ctlwizchip(CW_INIT_WIZCHIP, sn_size);
// Seems we need a small delay after init
mp_hal_delay_ms(250);
// If the device doesn't have a MAC address then set one
uint8_t mac[6];
getSHAR(mac);
if ((mac[0] | mac[1] | mac[2] | mac[3] | mac[4] | mac[5]) == 0) {
mp_hal_get_mac(MP_HAL_MAC_ETH0, mac);
setSHAR(mac);
}
// Hook the Wiznet into lwIP
wiznet5k_lwip_init(&wiznet5k_obj);
}
STATIC void wiznet5k_deinit(void) {
for (struct netif *netif = netif_list; netif != NULL; netif = netif->next) {
if (netif == &wiznet5k_obj.netif) {
netif_remove(netif);
netif->flags = 0;
break;
}
}
}
STATIC void wiznet5k_get_mac_address(wiznet5k_obj_t *self, uint8_t mac[6]) {
(void)self;
getSHAR(mac);
}
STATIC void wiznet5k_send_ethernet(wiznet5k_obj_t *self, size_t len, const uint8_t *buf) {
uint8_t ip[4] = {1, 1, 1, 1}; // dummy
int ret = WIZCHIP_EXPORT(sendto)(0, (byte*)buf, len, ip, 11); // dummy port
if (ret != len) {
printf("wiznet5k_send_ethernet: fatal error %d\n", ret);
netif_set_link_down(&self->netif);
netif_set_down(&self->netif);
}
}
// Stores the frame in self->eth_frame and returns number of bytes in the frame, 0 for no frame
STATIC uint16_t wiznet5k_recv_ethernet(wiznet5k_obj_t *self) {
uint16_t len = getSn_RX_RSR(0);
if (len == 0) {
return 0;
}
byte ip[4];
uint16_t port;
int ret = WIZCHIP_EXPORT(recvfrom)(0, self->eth_frame, 1514, ip, &port);
if (ret <= 0) {
printf("wiznet5k_poll: fatal error len=%u ret=%d\n", len, ret);
netif_set_link_down(&self->netif);
netif_set_down(&self->netif);
return 0;
}
return ret;
}
/*******************************************************************************/
// Wiznet5k lwIP interface
STATIC err_t wiznet5k_netif_output(struct netif *netif, struct pbuf *p) {
wiznet5k_obj_t *self = netif->state;
pbuf_copy_partial(p, self->eth_frame, p->tot_len, 0);
if (self->trace_flags & TRACE_ETH_TX) {
netutils_ethernet_trace(MP_PYTHON_PRINTER, p->tot_len, self->eth_frame, NETUTILS_TRACE_IS_TX | NETUTILS_TRACE_NEWLINE);
}
wiznet5k_send_ethernet(self, p->tot_len, self->eth_frame);
return ERR_OK;
}
STATIC err_t wiznet5k_netif_init(struct netif *netif) {
netif->linkoutput = wiznet5k_netif_output;
netif->output = etharp_output;
netif->mtu = 1500;
netif->flags = NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP | NETIF_FLAG_ETHERNET | NETIF_FLAG_IGMP;
wiznet5k_get_mac_address(netif->state, netif->hwaddr);
netif->hwaddr_len = sizeof(netif->hwaddr);
int ret = WIZCHIP_EXPORT(socket)(0, Sn_MR_MACRAW, 0, 0);
if (ret != 0) {
printf("WIZNET fatal error in netifinit: %d\n", ret);
return ERR_IF;
}
// Enable MAC filtering so we only get frames destined for us, to reduce load on lwIP
setSn_MR(0, getSn_MR(0) | Sn_MR_MFEN);
return ERR_OK;
}
STATIC void wiznet5k_lwip_init(wiznet5k_obj_t *self) {
ip_addr_t ipconfig[4];
ipconfig[0].addr = 0;
ipconfig[1].addr = 0;
ipconfig[2].addr = 0;
ipconfig[3].addr = 0;
netif_add(&self->netif, &ipconfig[0], &ipconfig[1], &ipconfig[2], self, wiznet5k_netif_init, ethernet_input);
self->netif.name[0] = 'e';
self->netif.name[1] = '0';
netif_set_default(&self->netif);
dns_setserver(0, &ipconfig[3]);
dhcp_set_struct(&self->netif, &self->dhcp_struct);
// Setting NETIF_FLAG_UP then clearing it is a workaround for dhcp_start and the
// LWIP_DHCP_CHECK_LINK_UP option, so that the DHCP client schedules itself to
// automatically start when the interface later goes up.
self->netif.flags |= NETIF_FLAG_UP;
dhcp_start(&self->netif);
self->netif.flags &= ~NETIF_FLAG_UP;
}
void wiznet5k_poll(void) {
wiznet5k_obj_t *self = &wiznet5k_obj;
if (!(self->netif.flags & NETIF_FLAG_LINK_UP)) {
return;
}
uint16_t len;
while ((len = wiznet5k_recv_ethernet(self)) > 0) {
if (self->trace_flags & TRACE_ETH_RX) {
netutils_ethernet_trace(MP_PYTHON_PRINTER, len, self->eth_frame, NETUTILS_TRACE_NEWLINE);
}
struct pbuf *p = pbuf_alloc(PBUF_RAW, len, PBUF_POOL);
if (p != NULL) {
pbuf_take(p, self->eth_frame, len);
if (self->netif.input(p, &self->netif) != ERR_OK) {
pbuf_free(p);
}
}
}
}
/*******************************************************************************/
// MicroPython bindings
// WIZNET5K([spi, pin_cs, pin_rst])
STATIC mp_obj_t wiznet5k_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
// check arguments
mp_arg_check_num(n_args, n_kw, 3, 3, false);
const spi_t *spi = spi_from_mp_obj(args[0]);
mp_hal_pin_obj_t cs = pin_find(args[1]);
mp_hal_pin_obj_t rst = pin_find(args[2]);
// Access the existing object, if it has been constructed with the same hardware interface
if (wiznet5k_obj.base.type == &mod_network_nic_type_wiznet5k) {
if (!(wiznet5k_obj.spi == spi && wiznet5k_obj.cs == cs && wiznet5k_obj.rst == rst
&& wiznet5k_obj.netif.flags != 0)) {
wiznet5k_deinit();
}
}
// Init the wiznet5k object
wiznet5k_obj.base.type = &mod_network_nic_type_wiznet5k;
wiznet5k_obj.cris_state = 0;
wiznet5k_obj.spi = spi;
wiznet5k_obj.cs = cs;
wiznet5k_obj.rst = rst;
wiznet5k_obj.trace_flags = 0;
// Return wiznet5k object
return MP_OBJ_FROM_PTR(&wiznet5k_obj);
}
STATIC mp_obj_t wiznet5k_regs(mp_obj_t self_in) {
(void)self_in;
printf("Wiz CREG:");
for (int i = 0; i < 0x50; ++i) {
if (i % 16 == 0) {
printf("\n %04x:", i);
}
#if MICROPY_PY_WIZNET5K == 5200
uint32_t reg = i;
#else
uint32_t reg = _W5500_IO_BASE_ | i << 8;
#endif
printf(" %02x", WIZCHIP_READ(reg));
}
for (int sn = 0; sn < 4; ++sn) {
printf("\nWiz SREG[%d]:", sn);
for (int i = 0; i < 0x30; ++i) {
if (i % 16 == 0) {
printf("\n %04x:", i);
}
#if MICROPY_PY_WIZNET5K == 5200
uint32_t reg = WIZCHIP_SREG_ADDR(sn, i);
#else
uint32_t reg = _W5500_IO_BASE_ | i << 8 | WIZCHIP_SREG_BLOCK(sn) << 3;
#endif
printf(" %02x", WIZCHIP_READ(reg));
}
}
printf("\n");
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(wiznet5k_regs_obj, wiznet5k_regs);
STATIC mp_obj_t wiznet5k_isconnected(mp_obj_t self_in) {
wiznet5k_obj_t *self = MP_OBJ_TO_PTR(self_in);
return mp_obj_new_bool(
wizphy_getphylink() == PHY_LINK_ON
&& (self->netif.flags & NETIF_FLAG_UP)
&& self->netif.ip_addr.addr != 0
);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(wiznet5k_isconnected_obj, wiznet5k_isconnected);
STATIC mp_obj_t wiznet5k_active(size_t n_args, const mp_obj_t *args) {
wiznet5k_obj_t *self = MP_OBJ_TO_PTR(args[0]);
if (n_args == 1) {
return mp_obj_new_bool(self->netif.flags & NETIF_FLAG_UP);
} else {
if (mp_obj_is_true(args[1])) {
if (!(self->netif.flags & NETIF_FLAG_UP)) {
wiznet5k_init();
netif_set_link_up(&self->netif);
netif_set_up(&self->netif);
}
} else {
if (self->netif.flags & NETIF_FLAG_UP) {
netif_set_down(&self->netif);
netif_set_link_down(&self->netif);
wiznet5k_deinit();
}
}
return mp_const_none;
}
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(wiznet5k_active_obj, 1, 2, wiznet5k_active);
STATIC mp_obj_t wiznet5k_ifconfig(size_t n_args, const mp_obj_t *args) {
wiznet5k_obj_t *self = MP_OBJ_TO_PTR(args[0]);
return mod_network_nic_ifconfig(&self->netif, n_args - 1, args + 1);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(wiznet5k_ifconfig_obj, 1, 2, wiznet5k_ifconfig);
STATIC mp_obj_t wiznet5k_status(size_t n_args, const mp_obj_t *args) {
wiznet5k_obj_t *self = MP_OBJ_TO_PTR(args[0]);
(void)self;
if (n_args == 1) {
// No arguments: return link status
if (self->netif.flags && wizphy_getphylink() == PHY_LINK_ON) {
if ((self->netif.flags & NETIF_FLAG_UP) && self->netif.ip_addr.addr != 0) {
return MP_OBJ_NEW_SMALL_INT(2);
} else {
return MP_OBJ_NEW_SMALL_INT(1);
}
} else {
return MP_OBJ_NEW_SMALL_INT(0);
}
}
mp_raise_ValueError("unknown config param");
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(wiznet5k_status_obj, 1, 2, wiznet5k_status);
STATIC mp_obj_t wiznet5k_config(size_t n_args, const mp_obj_t *args, mp_map_t *kwargs) {
wiznet5k_obj_t *self = MP_OBJ_TO_PTR(args[0]);
if (kwargs->used == 0) {
// Get config value
if (n_args != 2) {
mp_raise_TypeError("must query one param");
}
switch (mp_obj_str_get_qstr(args[1])) {
case MP_QSTR_mac: {
uint8_t buf[6];
wiznet5k_get_mac_address(self, buf);
return mp_obj_new_bytes(buf, 6);
}
default:
mp_raise_ValueError("unknown config param");
}
} else {
// Set config value(s)
if (n_args != 1) {
mp_raise_TypeError("can't specify pos and kw args");
}
for (size_t i = 0; i < kwargs->alloc; ++i) {
if (MP_MAP_SLOT_IS_FILLED(kwargs, i)) {
mp_map_elem_t *e = &kwargs->table[i];
switch (mp_obj_str_get_qstr(e->key)) {
case MP_QSTR_mac: {
mp_buffer_info_t buf;
mp_get_buffer_raise(e->value, &buf, MP_BUFFER_READ);
if (buf.len != 6) {
mp_raise_ValueError(NULL);
}
setSHAR(buf.buf);
memcpy(self->netif.hwaddr, buf.buf, 6);
break;
}
case MP_QSTR_trace: {
self->trace_flags = mp_obj_get_int(e->value);
break;
}
default:
mp_raise_ValueError("unknown config param");
}
}
}
return mp_const_none;
}
}
STATIC MP_DEFINE_CONST_FUN_OBJ_KW(wiznet5k_config_obj, 1, wiznet5k_config);
STATIC mp_obj_t send_ethernet_wrapper(mp_obj_t self_in, mp_obj_t buf_in) {
wiznet5k_obj_t *self = MP_OBJ_TO_PTR(self_in);
mp_buffer_info_t buf;
mp_get_buffer_raise(buf_in, &buf, MP_BUFFER_READ);
wiznet5k_send_ethernet(self, buf.len, buf.buf);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(send_ethernet_obj, send_ethernet_wrapper);
STATIC const mp_rom_map_elem_t wiznet5k_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_regs), MP_ROM_PTR(&wiznet5k_regs_obj) },
{ MP_ROM_QSTR(MP_QSTR_isconnected), MP_ROM_PTR(&wiznet5k_isconnected_obj) },
{ MP_ROM_QSTR(MP_QSTR_active), MP_ROM_PTR(&wiznet5k_active_obj) },
{ MP_ROM_QSTR(MP_QSTR_ifconfig), MP_ROM_PTR(&wiznet5k_ifconfig_obj) },
{ MP_ROM_QSTR(MP_QSTR_status), MP_ROM_PTR(&wiznet5k_status_obj) },
{ MP_ROM_QSTR(MP_QSTR_config), MP_ROM_PTR(&wiznet5k_config_obj) },
{ MP_ROM_QSTR(MP_QSTR_send_ethernet), MP_ROM_PTR(&send_ethernet_obj) },
};
STATIC MP_DEFINE_CONST_DICT(wiznet5k_locals_dict, wiznet5k_locals_dict_table);
const mp_obj_type_t mod_network_nic_type_wiznet5k = {
{ &mp_type_type },
.name = MP_QSTR_WIZNET5K,
.make_new = wiznet5k_make_new,
.locals_dict = (mp_obj_dict_t*)&wiznet5k_locals_dict,
};
#endif // MICROPY_PY_WIZNET5K && MICROPY_PY_LWIP
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