44 lines
1.0 KiB
C++
44 lines
1.0 KiB
C++
#include <HardwareSerial.h>
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#define RX_PIN 16
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#define TX_PIN 17
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const int timeOut = 50; // in ms
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HardwareSerial SerialUART(2);
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const char gngga[] = "$GNGGA,072446.00,3130.5226316,N,12024.0937010,E,4,27,0.5,31.924,M,0.000,M,2.0,*44";
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const char gngga2[] = "$GNGGA,072446.00,3130.5526316,N,12024.1237010,E,4,27,0.5,41.924,M,0.000,M,2.0,*44";
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hw_timer_t *timer = NULL;
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portMUX_TYPE timeMux = portMUX_INITIALIZER_UNLOCKED;
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volatile bool sendFlag = false;
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bool even = false;
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void IRAM_ATTR onTimer() {
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portENTER_CRITICAL_ISR(&timeMux);
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sendFlag = true;
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portEXIT_CRITICAL_ISR(&timeMux);
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}
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void setup() {
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Serial.begin(9600);
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SerialUART.begin(115200, SERIAL_8N1, RX_PIN, TX_PIN);
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timer = timerBegin(1000000);
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timerAttachInterrupt(timer, &onTimer);
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timerAlarm(timer, timeOut*1000, true, 0);
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}
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void loop() {
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if (sendFlag) {
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portENTER_CRITICAL(&timeMux);
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sendFlag = false;
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portEXIT_CRITICAL(&timeMux);
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even = !even;
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const uint8_t* message = even? (const uint8_t*)gngga : (const uint8_t*)gngga2;
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SerialUART.write(message, 82);
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}
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}
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