basic example code for Issue/324 on reading VSYS/VBUS while using wifi on Pico_W #326
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| # Generated Cmake Pico project file | ||
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| cmake_minimum_required(VERSION 3.13) | ||
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| set(CMAKE_C_STANDARD 11) | ||
| set(CMAKE_CXX_STANDARD 17) | ||
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| # Initialise pico_sdk from installed location | ||
| # (note this can come from environment, CMake cache etc) | ||
| set(PICO_SDK_PATH "/home/username/pico/pico-sdk") | ||
| set(PICO_EXTRAS_PATH "/home/username/pico/pico-extras") | ||
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| set(PICO_BOARD pico_w CACHE STRING "Board type") | ||
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| # Pull in Raspberry Pi Pico SDK (must be before project) | ||
| include(pico_sdk_import.cmake) | ||
| include(${PICO_EXTRAS_PATH}/external/pico_extras_import.cmake) | ||
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| if (PICO_SDK_VERSION_STRING VERSION_LESS "1.4.0") | ||
| message(FATAL_ERROR "Raspberry Pi Pico SDK version 1.4.0 (or later) required. Your version is ${PICO_SDK_VERSION_STRING}") | ||
| endif() | ||
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| project(wifi_vsys C CXX ASM) | ||
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| # Initialise the Raspberry Pi Pico SDK | ||
| pico_sdk_init() | ||
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| # Add executable. Default name is the project name, version 0.1 | ||
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| add_executable(wifi_vsys wifi_vsys.cpp ) | ||
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| pico_set_program_name(wifi_vsys "wifi_vsys") | ||
| pico_set_program_version(wifi_vsys "0.1") | ||
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| pico_enable_stdio_uart(wifi_vsys 0) | ||
| pico_enable_stdio_usb(wifi_vsys 1) | ||
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| # Add the standard library to the build | ||
| target_link_libraries(wifi_vsys | ||
| pico_stdlib | ||
| pico_lwip_http | ||
| pico_cyw43_arch_lwip_threadsafe_background | ||
| hardware_adc | ||
| ) | ||
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| # Add the standard include files to the build | ||
| target_include_directories(wifi_vsys PRIVATE | ||
| ${CMAKE_CURRENT_LIST_DIR} | ||
| ${CMAKE_CURRENT_LIST_DIR}/.. # for our common lwipopts or any other standard includes, if required | ||
| ) | ||
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| pico_add_extra_outputs(wifi_vsys) |
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| #ifndef _LWIPOPTS_H | ||
| #define _LWIPOPTS_H | ||
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| // Generally you would define your own explicit list of lwIP options | ||
| // (see https://www.nongnu.org/lwip/2_1_x/group__lwip__opts.html) | ||
| // | ||
| // This example uses a common include to avoid repetition | ||
| #include "lwipopts_examples_common.h" | ||
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| #endif |
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| #include <stdio.h> | ||
| #include "pico/stdlib.h" | ||
| #include "pico/cyw43_arch.h" | ||
| #include "hardware/gpio.h" | ||
| #include "hardware/adc.h" //to read ADC for soil moisture sensor, connected to pin 36 (3.3V), pin 33 (GND/AGND), pin 34 (GPIO28/ADC2) | ||
| #include "lwip/apps/http_client.h" //http client | ||
| #include "pico/cyw43_arch/arch_threadsafe_background.h" //to get access to void cyw43_thread_enter(void); and void cyw43_thread_exit(void); | ||
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| #ifndef CYW43_WL_GPIO2 | ||
| #define CYW43_WL_GPIO2 2 //this is not defined in pico_w.h | ||
| #endif | ||
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| const float conversion_factor = 3.3f / (1 << 12); //ADC_VREF=3.3, so this is the ADC resolution. | ||
| const char ssid[] = "myWifiNetwork"; | ||
| const char pass[] = "myWifiPassword"; | ||
| const uint32_t auth = CYW43_AUTH_WPA2_MIXED_PSK; | ||
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| //Http client variables | ||
| bool httpBusy = false; | ||
| char httpBuff[1000]; //if not big enough to read the result or headers, pico will hang. | ||
| httpc_connection_t settings; | ||
| ip_addr_t ip; | ||
| char apicall[64]; | ||
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| //handler for HTTP client result | ||
| void httpresult(void *arg, httpc_result_t httpc_result, u32_t rx_content_len, u32_t srv_res, err_t err){ | ||
| printf("[1] local result=%d http result=%d\n", httpc_result, srv_res); | ||
| } | ||
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| //handler for HTTP client headers | ||
| err_t headers(httpc_state_t *connection, void *arg, struct pbuf *hdr, u16_t hdr_len, u32_t content_len){ | ||
| pbuf_copy_partial(hdr, httpBuff, hdr->tot_len, 0); | ||
| printf("[1] content length=%d, header length %d, headers: %s\n", content_len, hdr_len, httpBuff); | ||
| //free memory | ||
| pbuf_free(hdr); | ||
| return ERR_OK; | ||
| } | ||
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| //handler for HTTP client body | ||
| err_t body(void *arg, struct altcp_pcb *conn, struct pbuf *p, err_t err){ | ||
| pbuf_copy_partial(p, httpBuff, p->tot_len, 0); | ||
| printf("[1] body: %s", httpBuff); | ||
| httpBusy = false; | ||
| //free memory | ||
| pbuf_free(p); | ||
| return ERR_OK; | ||
| } | ||
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| //Set GPIO29 back to settings for wifi usage (shared pin with ADC3, so settings are changed when activating ADC3) | ||
| void SetGPIO29WifiStatus(){ | ||
| gpio_set_function(29, GPIO_FUNC_PIO1); //7 | ||
| gpio_pull_down(29); | ||
| gpio_set_slew_rate(29, GPIO_SLEW_RATE_FAST); //1 | ||
| gpio_set_drive_strength(29, GPIO_DRIVE_STRENGTH_12MA); //3 | ||
| } | ||
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| int main() { | ||
| stdio_init_all(); | ||
| adc_init(); | ||
| adc_gpio_init(28); | ||
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| //Initialize wifi | ||
| if (cyw43_arch_init()) { | ||
| printf("WiFi init failed.\n"); | ||
| return 1; | ||
| } | ||
| cyw43_arch_enable_sta_mode(); | ||
| //connect to access point | ||
| if (cyw43_arch_wifi_connect_timeout_ms(ssid, pass, auth, 30000)) { | ||
| printf("failed to connect.\n"); | ||
| return 1; | ||
| } else { | ||
| printf("Connected.\n"); | ||
| } | ||
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| //set http client handlers | ||
| settings.result_fn = httpresult; | ||
| settings.headers_done_fn = headers; | ||
| //define IP address that hosts the web api to send the data | ||
| IP4_ADDR(&ip, 192, 168, 0, 1); | ||
| int ledStatus = 0; | ||
| float vsys=0; | ||
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| while(true) { | ||
| //flip onboard led | ||
| ledStatus = 1 - ledStatus; | ||
| cyw43_arch_gpio_put(CYW43_WL_GPIO_LED_PIN, ledStatus); | ||
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| //Select ADC2 to read moisture sensor | ||
| adc_select_input(2); | ||
| uint16_t result = adc_read(); | ||
| float voltage = result * conversion_factor; | ||
| printf("ADC2 value: 0x%03x, %i, voltage: %3.1f V\n", result, result, voltage); | ||
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| //make sure there is not HTTP request in progress or other wifi activity when we want to check the battery status | ||
| if (!httpBusy){ | ||
| httpBusy = true; | ||
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| //prevent wifi background processing so we can use the shared pins | ||
| cyw43_thread_enter(); //or macro: CYW43_THREAD_ENTER | ||
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| //WL_GPIO2, IP VBUS sense - high if VBUS is present, else low | ||
| uint vbus = cyw43_arch_gpio_get(CYW43_WL_GPIO2); | ||
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| //we could decide to only check the voltage if not powered by USB port/VBUS and perhaps not check it every cycle. | ||
| //if (vbus==0) { | ||
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| //initialize and select ADC3/GPIO29 | ||
| adc_gpio_init(29); | ||
| adc_select_input(3); | ||
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| //Read ADC3, result is 1/3 of VSYS, so we still need to multiply the conversion factor with 3 to get the input voltage | ||
| uint16_t adc3 = adc_read(); | ||
| vsys = adc3 * conversion_factor * 3; | ||
| printf("ADC3 value: 0x%03x, %i, voltage: %f V\n", adc3, adc3, vsys); | ||
| //set GPIO29 back to the settings for wifi, otherwise cyw43 will not work correctly | ||
| SetGPIO29WifiStatus(); | ||
| //} | ||
| //else{ | ||
| //USB/VSYS powered, do nothing (voltage should be somewhere around 5V) | ||
| //} | ||
| //exit to allow wifi communication again | ||
| cyw43_thread_exit(); //or macro: CYW43_THREAD_EXIT | ||
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| sprintf(apicall, "/api/echo?m=%3.3f&v=%3.3f&b=%i", voltage, vsys, vbus); | ||
| printf("Calling API: %s\n", apicall); | ||
| err_t err = httpc_get_file( | ||
| &ip, //IP address hosting the API | ||
| 5131, //port | ||
| apicall, //api call | ||
| &settings, //handlers for result/headers | ||
| body, //handler for body | ||
| NULL, | ||
| NULL | ||
| ); | ||
| printf("[1] http status %d \n", err); | ||
| } | ||
| else{ | ||
| printf("[1] http client is busy...\n"); | ||
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There was a problem hiding this comment. What are all these There was a problem hiding this comment. ah, some leftover from debugging, totally irrelevant There was a problem hiding this comment. leftover, as in, I was running the http request on core1 initially, so it was indicating from which core the printf was coming... |
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| } | ||
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| #if PICO_CYW43_ARCH_POLL | ||
| // if you are using pico_cyw43_arch_poll, then you must poll periodically from your | ||
| // main loop (not from a timer) to check for WiFi driver or lwIP work that needs to be done. | ||
| cyw43_arch_poll(); | ||
| sleep_ms(1); | ||
| #else | ||
| // if you are not using pico_cyw43_arch_poll, then WiFI driver and lwIP work | ||
| // is done via interrupt in the background. This sleep is just an example of some (blocking) | ||
| // work you might be doing. | ||
| sleep_ms(5000); | ||
| #endif | ||
| } | ||
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| cyw43_arch_deinit(); | ||
| return 0; | ||
| } | ||
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soil moisture sensor - huh?
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one of these: https://arduino-tutorials.net/tutorial/capacitive-soil-moisture-sensor-arduino
I left the sensor reading in there to make the example at least a little more interesting.