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airmon_pms.c
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airmon_pms.c
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#include "airmon_pms.h"
#include <string.h>
#define TAG "AirmonPms"
#define UINT16BE(p) (((p)[0] << 8) | (p)[1])
#define PMS_BAUDRATE 9600
#define PMS_CTRL_FRAME_LEN 4
#define PMS_DATA_FRAME_LEN 28
#define PMS_START_CHAR_1 0x42
#define PMS_START_CHAR_2 0x4d
typedef enum {
WorkerEvtStop = (1 << 0),
WorkerEvtRxDone = (1 << 1),
} WorkerEvtFlags;
typedef enum {
RxStateStartChar1,
RxStateStartChar2,
RxStateFrameLength,
RxStateFrameData
} RxState;
#define WORKER_ALL_RX_EVENTS (WorkerEvtStop | WorkerEvtRxDone)
static void airmon_pms_uart_on_irq_cb(FuriHalSerialHandle* handle, FuriHalSerialRxEvent event, void* context) {
UNUSED(handle);
AirmonPmsContext* pms_context = context;
if(event & FuriHalSerialRxEventData) {
uint8_t data = furi_hal_serial_async_rx(handle);
furi_stream_buffer_send(pms_context->rx_stream, &data, 1, 0);
furi_thread_flags_set(furi_thread_get_id(pms_context->thread), WorkerEvtRxDone);
}
}
static void airmon_pms_serial_init(AirmonPmsContext* pms_context) {
pms_context->serial = furi_hal_serial_control_acquire(FuriHalSerialIdUsart);
furi_check(pms_context->serial);
furi_hal_serial_init(pms_context->serial, PMS_BAUDRATE);
furi_hal_serial_async_rx_start(pms_context->serial, airmon_pms_uart_on_irq_cb, pms_context, true);
}
static void airmon_pms_serial_deinit(AirmonPmsContext* pms_context) {
furi_hal_serial_deinit(pms_context->serial);
furi_hal_serial_control_release(pms_context->serial);
}
bool airmon_pms_frame_valid(AirmonPmsContext* pms_context, size_t frame_len) {
uint16_t checksum =
PMS_START_CHAR_1 + PMS_START_CHAR_2 + (frame_len >> 8) + (frame_len & 0xff);
uint8_t* p = pms_context->rx_buf;
while(p < pms_context->rx_buf + frame_len - 2) {
checksum += *p++ & 0xff;
}
return checksum == UINT16BE(p);
}
void airmon_pms_process_data_frame(AirmonPmsContext* pms_context) {
furi_mutex_acquire(pms_context->mutex, FuriWaitForever);
AirmonPmsData* d = &pms_context->pms_data;
uint8_t* p = pms_context->rx_buf;
d->pm1_0cf = UINT16BE(p);
d->pm2_5cf = UINT16BE(p + 2);
d->pm10cf = UINT16BE(p + 4);
d->pm1_0at = UINT16BE(p + 6);
d->pm2_5at = UINT16BE(p + 8);
d->pm10at = UINT16BE(p + 10);
d->ct0_3 = UINT16BE(p + 12);
d->ct0_5 = UINT16BE(p + 14);
d->ct1_0 = UINT16BE(p + 16);
d->ct2_5 = UINT16BE(p + 18);
d->ct5_0 = UINT16BE(p + 20);
d->ct10 = UINT16BE(p + 22);
pms_context->pms_data_timestamp = furi_get_tick();
furi_mutex_release(pms_context->mutex);
}
void airmon_pms_process_frame(AirmonPmsContext* pms_context, size_t frame_len) {
if(!airmon_pms_frame_valid(pms_context, frame_len)) {
FURI_LOG_W(TAG, "Invalid frame CRC");
return;
}
if(frame_len == PMS_DATA_FRAME_LEN) {
airmon_pms_process_data_frame(pms_context);
}
}
static int32_t airmon_pms_worker(void* context) {
FURI_LOG_D(TAG, "Worker started");
AirmonPmsContext* pms_context = context;
pms_context->rx_stream = furi_stream_buffer_alloc(RX_BUF_SIZE, 1);
size_t rx_offset = 0;
airmon_pms_serial_init(pms_context);
FURI_LOG_D(TAG, "Entering event loop");
RxState rx_state = RxStateStartChar1;
size_t rx_frame_len = 0;
while(1) {
uint32_t events =
furi_thread_flags_wait(WORKER_ALL_RX_EVENTS, FuriFlagWaitAny, FuriWaitForever);
furi_check((events & FuriFlagError) == 0);
if(events & WorkerEvtStop) {
break;
}
if(events & WorkerEvtRxDone) {
size_t rx_len = 0;
while(
(rx_len = furi_stream_buffer_receive(
pms_context->rx_stream,
pms_context->rx_buf + rx_offset,
RX_BUF_SIZE - rx_offset - 1,
0))) {
FURI_LOG_D(TAG, "rx_len: %d", rx_len);
rx_offset += rx_len;
bool rx_available = true;
size_t rx_processed;
while(rx_available) {
rx_processed = 0;
switch(rx_state) {
case RxStateStartChar1:
if(*pms_context->rx_buf == PMS_START_CHAR_1) {
rx_state = RxStateStartChar2;
}
rx_processed = 1;
break;
case RxStateStartChar2:
if(*pms_context->rx_buf == PMS_START_CHAR_2) {
rx_state = RxStateFrameLength;
rx_processed = 1;
} else {
rx_state = RxStateStartChar1;
}
break;
case RxStateFrameLength:
if(rx_offset > 2) {
rx_frame_len = UINT16BE(pms_context->rx_buf);
FURI_LOG_D(TAG, "rx_frame_len: %d", rx_frame_len);
rx_processed = 2;
rx_state = (rx_frame_len >= PMS_CTRL_FRAME_LEN &&
rx_frame_len <= PMS_DATA_FRAME_LEN) ?
RxStateFrameData :
RxStateStartChar1;
} else {
rx_available = false;
}
break;
case RxStateFrameData:
if(rx_offset >= rx_frame_len) {
airmon_pms_process_frame(pms_context, rx_frame_len);
rx_processed = rx_frame_len;
rx_state = RxStateStartChar1;
} else {
rx_available = false;
}
break;
default:
rx_state = RxStateStartChar1;
break;
}
FURI_LOG_D(TAG, "RxState: %d", rx_state);
if(rx_processed) {
rx_offset -= rx_processed;
rx_available = !!rx_offset;
if(rx_available) {
memmove(
pms_context->rx_buf,
pms_context->rx_buf + rx_processed,
rx_offset);
}
}
}
};
}
}
airmon_pms_serial_deinit(pms_context);
furi_stream_buffer_free(pms_context->rx_stream);
FURI_LOG_D(TAG, "Worker stopped");
return 0;
}
AirmonPmsContext* airmon_pms_context_alloc() {
AirmonPmsContext* pms_context = malloc(sizeof(AirmonPmsContext));
pms_context->mutex = furi_mutex_alloc(FuriMutexTypeNormal);
if(!pms_context->mutex) {
FURI_LOG_E("AirmonPms", "cannot create mutex\r\n");
free(pms_context);
return NULL;
}
memset(&pms_context->pms_data, 0, sizeof(AirmonPmsData));
pms_context->thread = furi_thread_alloc();
furi_thread_set_name(pms_context->thread, "AirmonPmsWorker");
furi_thread_set_stack_size(pms_context->thread, 1024);
furi_thread_set_context(pms_context->thread, pms_context);
furi_thread_set_callback(pms_context->thread, airmon_pms_worker);
return pms_context;
}
void airmon_pms_context_free(AirmonPmsContext* pms_context) {
furi_assert(pms_context);
furi_thread_free(pms_context->thread);
free(pms_context);
}
void airmon_pms_init(AirmonPmsContext* pms_context) {
furi_assert(pms_context);
furi_hal_power_enable_otg();
furi_thread_start(pms_context->thread);
}
void airmon_pms_deinit(AirmonPmsContext* pms_context) {
furi_assert(pms_context);
furi_thread_flags_set(furi_thread_get_id(pms_context->thread), WorkerEvtStop);
furi_thread_join(pms_context->thread);
furi_hal_power_disable_otg();
}