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scaprilescaprile
committedMar 24, 2025·
Add Pico + RM2 Wi-Fi example
1 parent 03e9e55 commit 12897f7

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‎tutorials/pico-sdk/rm2-pico-baremetal-builtin/CMakeLists.txt

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cmake_minimum_required(VERSION 3.13)
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include(pico-sdk/pico_sdk_init.cmake)
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project(firmware)
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pico_sdk_init()
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add_executable(firmware
8+
main.c
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mongoose.c
10+
)
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target_include_directories(firmware PUBLIC
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.
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)
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target_link_libraries(firmware hardware_pio pico_stdlib pico_rand)
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pico_add_extra_outputs(firmware) # create map/bin/hex file etc.
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pico_enable_stdio_usb(firmware 1) # Route stdio
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pico_enable_stdio_uart(firmware 0) # to USB
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# Mongoose build flags in mongoose_config.h
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# Example build options

‎tutorials/pico-sdk/rm2-pico-baremetal-builtin/Makefile

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RM = rm -rf
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MKBUILD = test -d build || mkdir build
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ifeq ($(OS),Windows_NT)
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RM = cmd /C del /Q /F /S
5+
MKBUILD = if not exist build mkdir build
6+
endif
7+
8+
all example:
9+
true
10+
11+
build build/firmware.uf2: pico-sdk main.c
12+
$(MKBUILD)
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cd build && cmake -G "Unix Makefiles" .. && make
14+
15+
pico-sdk:
16+
git clone --depth 1 -b 2.1.0 https://github.com/raspberrypi/pico-sdk $@
17+
cd $@ && git submodule update --init
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clean:
20+
$(RM) pico-sdk build

‎tutorials/pico-sdk/rm2-pico-baremetal-builtin/hal.h

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1+
// Copyright (c) 2025 Cesanta Software Limited
2+
// All rights reserved
3+
4+
#include "pico/stdlib.h"
5+
#include "hardware/pio.h"
6+
7+
extern void mg_delayms(unsigned int ms);
8+
9+
#define SPIPIO pio0
10+
#define SPISM 0
11+
#define DATAPIN 2
12+
#define CLKPIN 3
13+
#define CSPIN 1
14+
#define PWRPIN 0
15+
16+
#define piospi_wrap_target 0
17+
#define piospi_wrap 6
18+
#define piospi_pio_version 0
19+
20+
#define piospi_offset_rx_ 7u
21+
22+
static const uint16_t piospi_program_instructions[] = {
23+
// .wrap_target
24+
0x80a0, // 0: pull block side 0
25+
0xa027, // 1: mov x, osr side 0
26+
0x6068, // 2: out null, 8 side 0
27+
0x6001, // 3: out pins, 1 side 0
28+
0x1043, // 4: jmp x--, 3 side 1
29+
0xe000, // 5: set pins, 0 side 0
30+
0xc020, // 6: irq wait 0 side 0
31+
// .wrap
32+
0xe080, // 7: set pindirs, 0 side 0
33+
0x6020, // 8: out x, 32 side 0
34+
0x4001, // 9: in pins, 1 side 0
35+
0x1049, // 10: jmp x--, 9 side 1
36+
0xe000, // 11: set pins, 0 side 0
37+
0xe081, // 12: set pindirs, 1 side 0
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0xc020, // 13: irq wait 0 side 0
39+
0x0000, // 14: jmp 0 side 0
40+
};
41+
42+
static const struct pio_program piospi_program = {
43+
.instructions = piospi_program_instructions,
44+
.length = 15,
45+
.origin = -1,
46+
.pio_version = 0,
47+
#if PICO_PIO_VERSION > 0
48+
.used_gpio_ranges = 0x0
49+
#endif
50+
};
51+
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static inline pio_sm_config piospi_program_get_default_config(uint offset) {
53+
pio_sm_config c = pio_get_default_sm_config();
54+
sm_config_set_wrap(&c, offset + piospi_wrap_target, offset + piospi_wrap);
55+
sm_config_set_sideset(&c, 1, false, false);
56+
return c;
57+
}
58+
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static inline pio_sm_config piospi_init(PIO pio, uint sm, uint addr, uint data, uint clk) {
60+
pio_gpio_init(pio, data);
61+
pio_gpio_init(pio, clk);
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pio_sm_set_pins_with_mask(pio, sm, 0, (1 << data) | (1 << clk));
63+
pio_sm_config c = piospi_program_get_default_config(addr);
64+
sm_config_set_out_pins(&c, data, 1);
65+
sm_config_set_in_pins(&c, data);
66+
sm_config_set_set_pins(&c, data, 1);
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sm_config_set_sideset_pins(&c, clk);
68+
pio_sm_set_consecutive_pindirs(pio, sm, data, 1, true);
69+
pio_sm_set_consecutive_pindirs(pio, sm, clk, 1, true);
70+
pio_sm_set_pindirs_with_mask(pio, sm, (1 << data) | (1 << clk), (1 << data) | (1 << clk));
71+
sm_config_set_in_shift(&c, false, true, 8); // push bytes, MSB first, auto
72+
#if PICO_RP2040
73+
sm_config_set_clkdiv(&c, 18); // Run at 133/1 = <50MHz (2x data rate)
74+
#else
75+
sm_config_set_clkdiv(&c, 20); // Run at 150/1 = <50MHz (2x data rate)
76+
#endif
77+
return c;
78+
}
79+
static inline void piospi_tx(PIO pio, uint sm, pio_sm_config *c, uint addr, uint data) {
80+
sm_config_set_fifo_join(c, PIO_FIFO_JOIN_TX);
81+
sm_config_set_out_shift(c, false, true, 8); // pull bytes, MSB first, auto
82+
pio_sm_init(pio, sm, addr, c);
83+
}
84+
static inline void piospi_rx(PIO pio, uint sm, pio_sm_config *c, uint addr, uint data) {
85+
sm_config_set_fifo_join(c, PIO_FIFO_JOIN_NONE);
86+
sm_config_set_out_shift(c, false, true, 32); // pull words, MSB first, auto
87+
pio_sm_init(pio, sm, addr + piospi_offset_rx_, c);
88+
}
89+
static inline void piospi_done(PIO pio, uint sm) {
90+
while(!pio_interrupt_get(pio, 0));
91+
pio_sm_set_enabled(pio, sm, false);
92+
pio_interrupt_clear(pio, 0);
93+
}
94+
95+
static pio_sm_config s_piospi_sm_config;
96+
static uint s_piospi_sm_addr;
97+
98+
void piospi_write(uint8_t *data, size_t len) {
99+
size_t initial_len = len;
100+
piospi_tx(SPIPIO, SPISM, &s_piospi_sm_config, s_piospi_sm_addr, DATAPIN);
101+
__compiler_memory_barrier();
102+
pio_sm_put(SPIPIO, SPISM, (len * 8) - 1); // bits to transmit
103+
pio_sm_set_enabled(SPIPIO, SPISM, true);
104+
while (len--) pio_sm_put_blocking(SPIPIO, SPISM, (*data++) << 24);
105+
piospi_done(SPIPIO, SPISM);
106+
}
107+
108+
// Read data block from SPI interface
109+
void piospi_read(uint8_t *data, size_t len) {
110+
piospi_rx(SPIPIO, SPISM, &s_piospi_sm_config, s_piospi_sm_addr, DATAPIN);
111+
__compiler_memory_barrier();
112+
pio_sm_put(SPIPIO, SPISM, (len * 8) - 1); // bits to receive
113+
pio_sm_set_enabled(SPIPIO, SPISM, true);
114+
while (len--) *data++ = pio_sm_get_blocking(SPIPIO, SPISM);
115+
piospi_done(SPIPIO, SPISM);
116+
}
117+
118+
void hwspecific_spi_init(void) {
119+
gpio_init(PWRPIN);
120+
gpio_set_dir(PWRPIN, GPIO_OUT);
121+
gpio_put(PWRPIN, 0);
122+
gpio_init(CSPIN);
123+
gpio_set_dir(CSPIN, GPIO_OUT);
124+
gpio_put(CSPIN, 0);
125+
// init SPI pins so they are idle and stable during power up
126+
gpio_init(DATAPIN);
127+
gpio_set_dir(DATAPIN, GPIO_OUT);
128+
gpio_put(DATAPIN, 0);
129+
gpio_init(CLKPIN);
130+
gpio_set_dir(CLKPIN, GPIO_OUT);
131+
gpio_put(CLKPIN, 0);
132+
mg_delayms(100);
133+
gpio_put(CSPIN, 1);
134+
gpio_put(PWRPIN, 1);
135+
s_piospi_sm_addr = pio_add_program(SPIPIO, &piospi_program);
136+
s_piospi_sm_config = piospi_init(SPIPIO, SPISM, s_piospi_sm_addr, DATAPIN, CLKPIN);
137+
mg_delayms(50);
138+
}
139+
140+
void hwspecific_spi_begin(void *arg) {
141+
gpio_put(CSPIN, 0);
142+
(void) arg;
143+
}
144+
145+
// either write or read, not both
146+
void hwspecific_spi_txn(void *arg, uint8_t *txdata, uint8_t *rxdata, size_t len) {
147+
if (txdata != NULL) piospi_write(txdata, len);
148+
if (rxdata != NULL) piospi_read(rxdata, len);
149+
(void) arg;
150+
}
151+
152+
void hwspecific_spi_end(void *arg) {
153+
gpio_put(CSPIN, 1);
154+
(void) arg;
155+
}

‎tutorials/pico-sdk/rm2-pico-baremetal-builtin/main.c

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1+
// Copyright (c) 2025 Cesanta Software Limited
2+
// All rights reserved
3+
4+
#include "mongoose.h"
5+
#include "hal.h"
6+
7+
8+
#define WIFI_SSID "YOUR_WIFI_NETWORK_NAME" // SET THIS!
9+
#define WIFI_PASS "YOUR_WIFI_PASSWORD" // SET THIS!
10+
11+
12+
static const struct mg_tcpip_spi_ spi = {NULL, hwspecific_spi_begin, hwspecific_spi_end, hwspecific_spi_txn};
13+
14+
#ifndef CYW43_RESOURCE_ATTRIBUTE
15+
#define CYW43_RESOURCE_ATTRIBUTE
16+
#endif
17+
#include "pico-sdk/lib/cyw43-driver/firmware/w43439A0_7_95_49_00_combined.h"
18+
#include "pico-sdk/lib/cyw43-driver/firmware/wifi_nvram_43439.h"
19+
static const struct mg_tcpip_driver_cyw_firmware fw = {
20+
(const uint8_t *)w43439A0_7_95_49_00_combined, (size_t)CYW43_WIFI_FW_LEN,
21+
(const uint8_t *)wifi_nvram_4343, (size_t)sizeof(wifi_nvram_4343),
22+
(const uint8_t *)(w43439A0_7_95_49_00_combined + sizeof(w43439A0_7_95_49_00_combined) - CYW43_CLM_LEN), (size_t)CYW43_CLM_LEN};
23+
24+
// mif user states
25+
enum {AP, SCANNING, STOPPING_AP, CONNECTING, READY};
26+
static unsigned int state;
27+
static uint32_t s_ip, s_mask;
28+
29+
30+
static void mif_fn(struct mg_tcpip_if *ifp, int ev, void *ev_data) {
31+
// TODO(): should we include this inside ifp ? add an fn_data ?
32+
if (ev == MG_TCPIP_EV_ST_CHG) {
33+
MG_INFO(("State change: %u", *(uint8_t *) ev_data));
34+
}
35+
switch(state) {
36+
case AP: // we are in AP mode, wait for a user connection to trigger a scan or a connection to a network
37+
if (ev == MG_TCPIP_EV_ST_CHG && *(uint8_t *) ev_data == MG_TCPIP_STATE_UP) {
38+
MG_INFO(("Access Point started"));
39+
s_ip = ifp->ip, ifp->ip = MG_IPV4(192, 168, 169, 1);
40+
s_mask = ifp->mask, ifp->mask = MG_IPV4(255, 255, 255, 0);
41+
ifp->enable_dhcp_client = false;
42+
ifp->enable_dhcp_server = true;
43+
} else if (ev == MG_TCPIP_EV_ST_CHG && *(uint8_t *) ev_data == MG_TCPIP_STATE_READY) {
44+
MG_INFO(("Access Point READY !"));
45+
46+
// simulate user request to scan for networks
47+
bool res = mg_wifi_scan();
48+
MG_INFO(("Starting scan: %s", res ? "OK":"FAIL"));
49+
if (res) state = SCANNING;
50+
}
51+
break;
52+
case SCANNING:
53+
if (ev == MG_TCPIP_EV_WIFI_SCAN_RESULT) {
54+
struct mg_wifi_scan_bss_data *bss = (struct mg_wifi_scan_bss_data *) ev_data;
55+
MG_INFO(("BSS: %.*s (%u) (%M) %d dBm %u", bss->SSID.len, bss->SSID.buf, bss->channel, mg_print_mac, bss->BSSID, (int) bss->RSSI, bss->security));
56+
} else if (ev == MG_TCPIP_EV_WIFI_SCAN_END) {
57+
struct mg_tcpip_driver_cyw_data *d = (struct mg_tcpip_driver_cyw_data *) ifp->driver_data;
58+
MG_INFO(("Wi-Fi scan finished"));
59+
60+
// simulate user selection of a network (1/2: stop AP)
61+
bool res = mg_wifi_ap_stop();
62+
MG_INFO(("Manually stopping AP: %s", res ? "OK":"FAIL"));
63+
if (res) state = STOPPING_AP;
64+
// else we have a hw/fw problem
65+
}
66+
break;
67+
case STOPPING_AP:
68+
if (ev == MG_TCPIP_EV_ST_CHG && *(uint8_t *) ev_data == MG_TCPIP_STATE_DOWN) {
69+
struct mg_tcpip_driver_cyw_data *d = (struct mg_tcpip_driver_cyw_data *) ifp->driver_data;
70+
d->apmode = false;
71+
72+
// simulate user selection of a network (2/2: actual connect)
73+
bool res = mg_wifi_connect(d->ssid, d->pass);
74+
MG_INFO(("Manually connecting: %s", res ? "OK":"FAIL"));
75+
if (res) {
76+
state = CONNECTING;
77+
ifp->ip = s_ip;
78+
ifp->mask = s_mask;
79+
if (ifp->ip == 0) ifp->enable_dhcp_client = true;
80+
ifp->enable_dhcp_server = false;
81+
} // else manually start AP as below
82+
}
83+
break;
84+
case CONNECTING:
85+
if (ev == MG_TCPIP_EV_ST_CHG && *(uint8_t *) ev_data == MG_TCPIP_STATE_READY) {
86+
MG_INFO(("READY!"));
87+
state = READY;
88+
89+
// simulate user code disconnection and go back to AP mode (1/2: disconnect)
90+
bool res = mg_wifi_disconnect();
91+
MG_INFO(("Manually disconnecting: %s", res ? "OK":"FAIL"));
92+
} else if (ev == MG_TCPIP_EV_WIFI_CONNECT_ERR) {
93+
MG_ERROR(("Wi-Fi connect failed"));
94+
// manually start AP as below
95+
}
96+
break;
97+
case READY:
98+
// go back to AP mode after a disconnection (simulation 2/2), you could retry
99+
if (ev == MG_TCPIP_EV_ST_CHG && *(uint8_t *) ev_data == MG_TCPIP_STATE_DOWN) {
100+
struct mg_tcpip_driver_cyw_data *d = (struct mg_tcpip_driver_cyw_data *) ifp->driver_data;
101+
bool res = mg_wifi_ap_start(d->apssid, d->appass, d->apchannel);
102+
MG_INFO(("Disconnected"));
103+
MG_INFO(("Manually starting AP: %s", res ? "OK":"FAIL"));
104+
if (res) {
105+
state = AP;
106+
d->apmode = true;
107+
}
108+
}
109+
break;
110+
}
111+
}
112+
113+
114+
// Pico printf is packet oriented and Mongoose's byte-per-byte call makes it lose chars
115+
// this just makes things a little more readable, still losing chars when debugging
116+
static char buf[81];
117+
static void mylogger(char c, void *param) {
118+
static int num = 0;
119+
if (c != '\n') buf[num++] = c;
120+
if (num == 80 || c == '\n') {
121+
buf[num] = '\0';
122+
num = 0;
123+
puts(buf);
124+
}
125+
}
126+
127+
128+
static struct mg_tcpip_driver_cyw_data d = {
129+
(struct mg_tcpip_spi_ *)&spi, (struct mg_tcpip_driver_cyw_firmware *)&fw, WIFI_SSID, WIFI_PASS, "mongoose", "mongoose", 0, 0, 10, true};
130+
131+
int main(void) {
132+
// initialize stdio
133+
stdio_init_all();
134+
sleep_ms(4000); MG_INFO(("Starting"));
135+
136+
hwspecific_spi_init();
137+
138+
state = d.apmode ? AP : CONNECTING;
139+
140+
struct mg_mgr mgr; // Initialise Mongoose event manager
141+
mg_mgr_init(&mgr); // and attach it to the interface
142+
mg_log_set(MG_LL_DEBUG); // Set log level
143+
mg_log_set_fn(mylogger, NULL);
144+
145+
// Initialise Mongoose network stack
146+
// Either set use_dhcp or enter a static config.
147+
// For static configuration, specify IP/mask/GW in network byte order
148+
struct mg_tcpip_if mif = {
149+
.ip = 0,
150+
.driver = (struct mg_tcpip_driver *)&mg_tcpip_driver_cyw,
151+
.driver_data = (struct mg_tcpip_driver_cyw_data*)&d,
152+
.fn = mif_fn,
153+
// .recv_queue.size = 8192
154+
};
155+
156+
mg_tcpip_init(&mgr, &mif);
157+
MG_INFO(("Init done, starting main loop"));
158+
159+
MG_INFO(("Initialising application..."));
160+
161+
MG_INFO(("Starting event loop"));
162+
for (;;) {
163+
mg_mgr_poll(&mgr, 0);
164+
}
165+
166+
return 0;
167+
}

‎tutorials/pico-sdk/rm2-pico-baremetal-builtin/mongoose.c

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1+
../../../mongoose.c

‎tutorials/pico-sdk/rm2-pico-baremetal-builtin/mongoose.h

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1+
../../../mongoose.h

‎tutorials/pico-sdk/rm2-pico-baremetal-builtin/mongoose_config.h

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1+
#define MG_ARCH MG_ARCH_PICOSDK
2+
3+
#define MG_ENABLE_TCPIP 1
4+
#define MG_ENABLE_DRIVER_CYW 1
5+
#define MG_ENABLE_TCPIP_DRIVER_INIT 0
6+
#define MG_ENABLE_PACKED_FS 1

‎tutorials/pico-sdk/rm2-pico-baremetal-builtin/pico_sdk_import.cmake

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1+
# This is a copy of <PICO_SDK_PATH>/external/pico_sdk_import.cmake
2+
3+
# This can be dropped into an external project to help locate this SDK
4+
# It should be include()ed prior to project()
5+
6+
if (DEFINED ENV{PICO_SDK_PATH} AND (NOT PICO_SDK_PATH))
7+
set(PICO_SDK_PATH $ENV{PICO_SDK_PATH})
8+
message("Using PICO_SDK_PATH from environment ('${PICO_SDK_PATH}')")
9+
endif ()
10+
11+
if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT} AND (NOT PICO_SDK_FETCH_FROM_GIT))
12+
set(PICO_SDK_FETCH_FROM_GIT $ENV{PICO_SDK_FETCH_FROM_GIT})
13+
message("Using PICO_SDK_FETCH_FROM_GIT from environment ('${PICO_SDK_FETCH_FROM_GIT}')")
14+
endif ()
15+
16+
if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT_PATH} AND (NOT PICO_SDK_FETCH_FROM_GIT_PATH))
17+
set(PICO_SDK_FETCH_FROM_GIT_PATH $ENV{PICO_SDK_FETCH_FROM_GIT_PATH})
18+
message("Using PICO_SDK_FETCH_FROM_GIT_PATH from environment ('${PICO_SDK_FETCH_FROM_GIT_PATH}')")
19+
endif ()
20+
21+
if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT_TAG} AND (NOT PICO_SDK_FETCH_FROM_GIT_TAG))
22+
set(PICO_SDK_FETCH_FROM_GIT_TAG $ENV{PICO_SDK_FETCH_FROM_GIT_TAG})
23+
message("Using PICO_SDK_FETCH_FROM_GIT_TAG from environment ('${PICO_SDK_FETCH_FROM_GIT_TAG}')")
24+
endif ()
25+
26+
if (PICO_SDK_FETCH_FROM_GIT AND NOT PICO_SDK_FETCH_FROM_GIT_TAG)
27+
set(PICO_SDK_FETCH_FROM_GIT_TAG "master")
28+
message("Using master as default value for PICO_SDK_FETCH_FROM_GIT_TAG")
29+
endif()
30+
31+
set(PICO_SDK_PATH "${PICO_SDK_PATH}" CACHE PATH "Path to the Raspberry Pi Pico SDK")
32+
set(PICO_SDK_FETCH_FROM_GIT "${PICO_SDK_FETCH_FROM_GIT}" CACHE BOOL "Set to ON to fetch copy of SDK from git if not otherwise locatable")
33+
set(PICO_SDK_FETCH_FROM_GIT_PATH "${PICO_SDK_FETCH_FROM_GIT_PATH}" CACHE FILEPATH "location to download SDK")
34+
set(PICO_SDK_FETCH_FROM_GIT_TAG "${PICO_SDK_FETCH_FROM_GIT_TAG}" CACHE FILEPATH "release tag for SDK")
35+
36+
if (NOT PICO_SDK_PATH)
37+
if (PICO_SDK_FETCH_FROM_GIT)
38+
include(FetchContent)
39+
set(FETCHCONTENT_BASE_DIR_SAVE ${FETCHCONTENT_BASE_DIR})
40+
if (PICO_SDK_FETCH_FROM_GIT_PATH)
41+
get_filename_component(FETCHCONTENT_BASE_DIR "${PICO_SDK_FETCH_FROM_GIT_PATH}" REALPATH BASE_DIR "${CMAKE_SOURCE_DIR}")
42+
endif ()
43+
# GIT_SUBMODULES_RECURSE was added in 3.17
44+
if (${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.17.0")
45+
FetchContent_Declare(
46+
pico_sdk
47+
GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
48+
GIT_TAG ${PICO_SDK_FETCH_FROM_GIT_TAG}
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GIT_SUBMODULES_RECURSE FALSE
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)
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else ()
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FetchContent_Declare(
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pico_sdk
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GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
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GIT_TAG ${PICO_SDK_FETCH_FROM_GIT_TAG}
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)
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endif ()
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if (NOT pico_sdk)
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message("Downloading Raspberry Pi Pico SDK")
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FetchContent_Populate(pico_sdk)
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set(PICO_SDK_PATH ${pico_sdk_SOURCE_DIR})
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endif ()
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set(FETCHCONTENT_BASE_DIR ${FETCHCONTENT_BASE_DIR_SAVE})
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else ()
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message(FATAL_ERROR
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"SDK location was not specified. Please set PICO_SDK_PATH or set PICO_SDK_FETCH_FROM_GIT to on to fetch from git."
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)
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endif ()
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endif ()
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get_filename_component(PICO_SDK_PATH "${PICO_SDK_PATH}" REALPATH BASE_DIR "${CMAKE_BINARY_DIR}")
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if (NOT EXISTS ${PICO_SDK_PATH})
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message(FATAL_ERROR "Directory '${PICO_SDK_PATH}' not found")
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endif ()
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set(PICO_SDK_INIT_CMAKE_FILE ${PICO_SDK_PATH}/pico_sdk_init.cmake)
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if (NOT EXISTS ${PICO_SDK_INIT_CMAKE_FILE})
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message(FATAL_ERROR "Directory '${PICO_SDK_PATH}' does not appear to contain the Raspberry Pi Pico SDK")
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endif ()
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set(PICO_SDK_PATH ${PICO_SDK_PATH} CACHE PATH "Path to the Raspberry Pi Pico SDK" FORCE)
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include(${PICO_SDK_INIT_CMAKE_FILE})

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