Apparently I was doing stuff
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f43defd194
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GPG key ID:
EE5227935FE3FF18
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@ -37,7 +37,7 @@ static uint8_t crc8(uint8_t msb, uint8_t lsb) {
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return crc8_table[lsb ^ crc8_table[msb ^ 0xff]];
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}
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static void sht30_reset_all() {
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void sht30_reset_all() {
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// Generall call recet
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uint8_t cmd[] = {0x06};
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i2c_write_blocking(i2c, 0x00, cmd, sizeof(cmd), false);
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@ -45,7 +45,7 @@ static void sht30_reset_all() {
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sleep_ms(2);
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}
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static uint16_t sht30_get_firmware_version() {
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uint16_t sht30_get_firmware_version() {
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uint8_t cmd[] = {0xd1, 0x00};
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i2c_write_blocking(i2c, addr, cmd, sizeof(cmd), true);
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uint8_t resp[3];
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@ -55,13 +55,13 @@ static uint16_t sht30_get_firmware_version() {
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return (uint16_t)resp[0] << 8 | resp[1];
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}
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static void sht30_start_capture() {
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void sht30_start_capture() {
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// High repeatability, 1 sample per second
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uint8_t cmd[] = {0x21, 0x30};
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i2c_write_blocking(i2c, addr, cmd, sizeof(cmd), false);
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};
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static struct sht30_result sht30_fetch_data() {
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struct sht30_result sht30_fetch_data() {
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uint8_t cmd[] = {0xe0, 0x00};
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i2c_write_blocking(i2c, addr, cmd, sizeof(cmd), true);
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uint8_t resp[6];
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1
rp2040/sht30wifi/.gitignore
vendored
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1
rp2040/sht30wifi/.gitignore
vendored
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@ -0,0 +1 @@
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secret.h
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15
rp2040/sht30wifi/CMakeLists.txt
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15
rp2040/sht30wifi/CMakeLists.txt
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@ -0,0 +1,15 @@
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cmake_minimum_required(VERSION 3.12)
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include($ENV{PICO_SDK_PATH}/pico_sdk_init.cmake)
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set(CMAKE_C_STANDARD 11)
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set(PICO_BOARD "pico_w")
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project(sht30wifi)
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pico_sdk_init()
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add_executable(sht30wifi main.c)
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target_include_directories(sht30wifi PRIVATE ${CMAKE_CURRENT_LIST_DIR})
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target_link_libraries(sht30wifi pico_stdlib hardware_i2c pico_cyw43_arch_lwip_threadsafe_background)
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pico_enable_stdio_usb(sht30wifi 1)
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pico_add_extra_outputs(sht30wifi)
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36
rp2040/sht30wifi/lwipopts.h
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36
rp2040/sht30wifi/lwipopts.h
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@ -0,0 +1,36 @@
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#pragma once
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#define NO_SYS 1
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#define LWIP_SOCKET 0
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#define MEM_LIBC_MALLOC 0
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#define MEM_ALIGNMENT 4
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#define MEM_SIZE 4000
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#define MEMP_NUM_TCP_SEG 32
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#define MEMP_NUM_ARP_QUEUE 10
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#define PBUF_POOL_SIZE 24
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#define LWIP_ARP 1
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#define LWIP_ETHERNET 1
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#define LWIP_ICMP 1
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#define LWIP_RAW 1
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#define TCP_WND (8 * TCP_MSS)
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#define TCP_MSS 1460
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#define TCP_SND_BUF (8 * TCP_MSS)
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#define TCP_SND_QUEUELEN ((4 * (TCP_SND_BUF) + (TCP_MSS - 1)) / (TCP_MSS))
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#define LWIP_NETIF_STATUS_CALLBACK 1
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#define LWIP_NETIF_LINK_CALLBACK 1
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#define LWIP_NETIF_HOSTNAME 1
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#define LWIP_NETCONN 0
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#define MEM_STATS 0
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#define SYS_STATS 0
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#define MEMP_STATS 0
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#define LINK_STATS 0
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#define LWIP_CHKSUM_ALGORITHM 3
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#define LWIP_DHCP 1
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#define LWIP_IPV4 1
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#define LWIP_TCP 1
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#define LWIP_UDP 1
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#define LWIP_DNS 1
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#define LWIP_TCP_KEEPALIVE 1
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#define LWIP_NETIF_TX_SINGLE_PBUF 1
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#define DHCP_DOES_ARP_CHECK 0
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#define LWIP_DHCP_DOES_ACD_CHECK 0
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111
rp2040/sht30wifi/main.c
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111
rp2040/sht30wifi/main.c
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@ -0,0 +1,111 @@
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#include <math.h>
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#include <stdio.h>
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#include "hardware/i2c.h"
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#include "pico/stdlib.h"
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#include "pico/cyw43_arch.h"
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#include "lwip/pbuf.h"
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#include "lwip/tcp.h"
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struct sht30_result {
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float temp_c;
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float relative_humidity;
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};
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static struct i2c_inst *i2c = i2c1;
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const static uint32_t sda_pin = 2;
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const static uint32_t scl_pin = 3;
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const static uint8_t addr = 0x44;
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const static uint8_t crc8_table[] = {
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0, 49, 98, 83, 196, 245, 166, 151, 185, 136, 219, 234, 125, 76, 31,
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46, 67, 114, 33, 16, 135, 182, 229, 212, 250, 203, 152, 169, 62, 15,
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92, 109, 134, 183, 228, 213, 66, 115, 32, 17, 63, 14, 93, 108, 251,
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202, 153, 168, 197, 244, 167, 150, 1, 48, 99, 82, 124, 77, 30, 47,
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184, 137, 218, 235, 61, 12, 95, 110, 249, 200, 155, 170, 132, 181, 230,
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215, 64, 113, 34, 19, 126, 79, 28, 45, 186, 139, 216, 233, 199, 246,
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165, 148, 3, 50, 97, 80, 187, 138, 217, 232, 127, 78, 29, 44, 2,
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51, 96, 81, 198, 247, 164, 149, 248, 201, 154, 171, 60, 13, 94, 111,
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65, 112, 35, 18, 133, 180, 231, 214, 122, 75, 24, 41, 190, 143, 220,
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237, 195, 242, 161, 144, 7, 54, 101, 84, 57, 8, 91, 106, 253, 204,
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159, 174, 128, 177, 226, 211, 68, 117, 38, 23, 252, 205, 158, 175, 56,
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9, 90, 107, 69, 116, 39, 22, 129, 176, 227, 210, 191, 142, 221, 236,
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123, 74, 25, 40, 6, 55, 100, 85, 194, 243, 160, 145, 71, 118, 37,
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20, 131, 178, 225, 208, 254, 207, 156, 173, 58, 11, 88, 105, 4, 53,
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102, 87, 192, 241, 162, 147, 189, 140, 223, 238, 121, 72, 27, 42, 193,
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240, 163, 146, 5, 52, 103, 86, 120, 73, 26, 43, 188, 141, 222, 239,
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130, 179, 224, 209, 70, 119, 36, 21, 59, 10, 89, 104, 255, 206, 157,
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172};
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static uint8_t crc8(uint8_t msb, uint8_t lsb) {
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return crc8_table[lsb ^ crc8_table[msb ^ 0xff]];
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}
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static void sht30_reset_all() {
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// Generall call recet
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uint8_t cmd[] = {0x06};
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i2c_write_blocking(i2c, 0x00, cmd, sizeof(cmd), false);
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// Datasheet says max hard reset time is 1ms, soft reset is 1.5ms
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sleep_ms(2);
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}
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static uint16_t sht30_get_firmware_version() {
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uint8_t cmd[] = {0xd1, 0x00};
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i2c_write_blocking(i2c, addr, cmd, sizeof(cmd), true);
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uint8_t resp[3];
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i2c_read_blocking(i2c, addr, resp, sizeof(resp), false);
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if (crc8(resp[0], resp[1]) != resp[2])
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return 0xffff;
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return (uint16_t)resp[0] << 8 | resp[1];
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}
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static void sht30_start_capture() {
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// High repeatability, 1 sample per second
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uint8_t cmd[] = {0x21, 0x30};
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i2c_write_blocking(i2c, addr, cmd, sizeof(cmd), false);
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};
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static struct sht30_result sht30_fetch_data() {
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uint8_t cmd[] = {0xe0, 0x00};
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i2c_write_blocking(i2c, addr, cmd, sizeof(cmd), true);
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uint8_t resp[6];
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i2c_read_blocking(i2c, addr, resp, sizeof(resp), false);
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float temp_c, relative_humidity;
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if (crc8(resp[0], resp[1]) == resp[2])
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temp_c = -45 + 175 * (float)(resp[0] << 8 | resp[1]) / 0xffff;
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else
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temp_c = NAN;
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if (crc8(resp[3], resp[4]) == resp[5])
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relative_humidity = 100 * (float)(resp[3] << 8 | resp[4]) / 0xffff;
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else
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relative_humidity = NAN;
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struct sht30_result result = {.temp_c = temp_c,
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.relative_humidity = relative_humidity};
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return result;
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}
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int main() {
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stdio_init_all();
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i2c_init(i2c, 100 * 1000);
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gpio_set_function(sda_pin, GPIO_FUNC_I2C);
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gpio_set_function(scl_pin, GPIO_FUNC_I2C);
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gpio_pull_up(sda_pin);
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gpio_pull_up(scl_pin);
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sleep_ms(2000);
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sht30_reset_all();
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sht30_start_capture();
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while (true) {
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sleep_ms(1000);
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struct sht30_result result = sht30_fetch_data();
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printf("{\"temperature\": %f, \"humidity\": %f}\n", result.temp_c,
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result.relative_humidity);
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}
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return 0;
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}
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6
rp2040/sht30wifi/secret.h.example
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6
rp2040/sht30wifi/secret.h.example
Normal file
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@ -0,0 +1,6 @@
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#pragma once
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#define WIFI_SSID "ssid"
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#define WIFI_PASSWORD "password"
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#define INFLUXDB_HOST "2001:db8::acab"
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#define INFLUXDB_TOKEN "token"
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