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get pms5003 read working

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Travis Shears 2025-04-10 21:51:35 +02:00
parent 51d97c2086
commit ecb1e00198
3 changed files with 110 additions and 34 deletions
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92
pms5003.c
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@ -1,6 +1,8 @@
#include "pms5003.h"
#include "hardware/uart.h"
#include "pico/stdlib.h"
#include <hardware/gpio.h>
#include <hardware/regs/intctrl.h>
#include <stdint.h>
#include <stdio.h>
@ -14,21 +16,91 @@ Sourcces:
https://shop.pimoroni.com/products/pms5003-particulate-matter-sensor-with-cable
- https://github.com/pimoroni/pms5003-python/blob/main/pms5003/__init__.py
- https://github.com/vogelrh/pms5003c/tree/master
- https://github.com/raspberrypi/pico-examples/blob/master/uart/hello_uart/hello_uart.c
-
https://github.com/raspberrypi/pico-examples/blob/master/uart/hello_uart/hello_uart.c
*/
void pms5003_init(pms5003_config *new_config, uart_inst_t *uart, uint8_t tx_pin,
uint8_t rx_pin) {
uart_init(uart, 9600);
gpio_set_function(tx_pin, UART_FUNCSEL_NUM(uart, tx_pin));
gpio_set_function(rx_pin, UART_FUNCSEL_NUM(uart, rx_pin));
new_config->uart = uart;
static uint8_t rx_buf[32] = {0};
static uint8_t rx_i = 0;
static float last_pm1_reading = 0;
static float last_pm2_5_reading = 0;
static float last_pm10_reading = 0;
static void extract_pm_values_from_rx_buf() {
uint8_t pm1_low = rx_buf[9];
uint8_t pm1_high = rx_buf[10];
uint16_t pm1 = ((uint16_t)pm1_high << 8) | pm1_low;
uint8_t pm2_5_low = rx_buf[11];
uint8_t pm2_5_high = rx_buf[12];
uint16_t pm2_5 = ((uint16_t)pm2_5_high << 8) | pm2_5_low;
uint8_t pm10_low = rx_buf[13];
uint8_t pm10_high = rx_buf[14];
uint16_t pm10 = ((uint16_t)pm10_high << 8) | pm10_low;
last_pm1_reading = (float)pm1;
last_pm2_5_reading = (float)pm2_5;
last_pm10_reading = (float)pm10;
}
static void on_uart_rx() {
while (uart_is_readable(uart1)) {
uint8_t ch = uart_getc(uart1);
// start of a message
if (ch == 0x42) {
printf("pms5003 reading received\n");
rx_i = 0;
}
rx_buf[rx_i] = ch;
rx_i++;
// end of message
if (rx_i == 31) {
extract_pm_values_from_rx_buf();
}
// guard
if (rx_i > 32) {
rx_i = 0;
}
}
}
static unsigned char pms5003_command_prefix[] = {0x42, 0x4D};
void pms5003_init(pms5003_config *new_config, uart_inst_t *uart, uint8_t tx_pin,
uint8_t rx_pin, uint8_t enable_pin, uint8_t reset_pin) {
gpio_set_function(tx_pin, UART_FUNCSEL_NUM(uart, tx_pin));
gpio_set_function(rx_pin, UART_FUNCSEL_NUM(uart, rx_pin));
uart_init(uart, 9600);
uart_set_format(uart, 8, 1, UART_PARITY_NONE);
irq_set_exclusive_handler(UART1_IRQ, on_uart_rx);
irq_set_enabled(UART1_IRQ, true);
uart_set_irq_enables(uart, true, false);
// high level or suspending is normal working status, while low level is sleeping mode.
gpio_init(enable_pin);
gpio_set_dir(enable_pin, GPIO_OUT);
gpio_put(enable_pin, 0);
// low resets
// gpio_init(reset_pin);
// gpio_set_dir(reset_pin, GPIO_OUT);
// gpio_set_pulls(enable_pin, true, false); // pull up
// gpio_put(enable_pin, 1);
new_config->uart = uart;
new_config->enable_pin = enable_pin;
new_config->reset_pin = reset_pin;
}
/**
Reads should happen min of 30sec after waking the sensor
*/
pms5003_reading pms5003_read(pms5003_config *config) {
pms5003_reading reading;
reading.pm1 = 0;
reading.pm2_5 = 0;
reading.pm10 = 0;
reading.pm1 = last_pm1_reading;
reading.pm2_5 = last_pm2_5_reading;
reading.pm10 = last_pm10_reading;
return reading;
}