103 lines
2.6 KiB
C++
103 lines
2.6 KiB
C++
extern "C" {
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void init();
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void blink();
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float float_test();
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void lm35_init(uint8_t port);
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uint8_t lm35_read();
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}
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#define UNKNOWN_PIN 0xFF
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uint8_t getPinMode(uint8_t pin)
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{
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uint8_t bit = digitalPinToBitMask(pin);
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uint8_t port = digitalPinToPort(pin);
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// I don't see an option for mega to return this, but whatever...
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if (NOT_A_PIN == port) return UNKNOWN_PIN;
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// Is there a bit we can check?
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if (0 == bit) return UNKNOWN_PIN;
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// Is there only a single bit set?
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if (bit & bit - 1) return UNKNOWN_PIN;
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volatile uint8_t *reg, *out;
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reg = portModeRegister(port);
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out = portOutputRegister(port);
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if (*reg & bit)
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return OUTPUT;
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else if (*out & bit)
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return INPUT_PULLUP;
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else
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return INPUT;
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}
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void printPortsStatus() {
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Serial.print(getPinMode(A0));
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Serial.print(getPinMode(A1));
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Serial.print(getPinMode(A2));
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Serial.print(getPinMode(A3));
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Serial.print(getPinMode(A4));
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Serial.print(getPinMode(A5));
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Serial.println();
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}
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/*
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ADC Prescaler Select Bits (ADPS): ADPS2, ADPS1 and ADPS0 bits are used to set circuit clock frequency.
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For ADC circuitry to work at its maximum resolution needs to be supplied with 50 kHz to 200 kHz frequency as per the datasheet;
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but the system clock will be generally higher (8 MHz, 10 MHz, 16 MHz etc).
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To reduce it to required frequency we use ADC prescaler bits. Suppose we have system clock with frequency 10Mhz (10000000 Hz) and set division factor to 64,
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then ADC clock frequency is 10000000/64 = 156250Hz = 156.25 KHz, which is between 50 to 200 KHz as mentioned in the datasheet.
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(http://www.robotplatform.com/knowledge/ADC/adc_tutorial_2.html)
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16 MHz / 128 = 16000000 Hz / 128 = 125000 Hz = 125 KHz => OK!
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*/
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void setup() {
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Serial.begin(9600);
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lm35_init(A3);
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// init();
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}
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void loop() {
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// blink();
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/*ADMUX = 0b01000011;
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PRR = 0b00000000;
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ADCSRA = 0b11000111;
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while ((ADCSRA & 0b01000000) != 0);
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short k = ADC;*/
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// max value = 1023
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// ref voltage is 1.1 V
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// 1023 - max byte value
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// +2 to 150, 10 mv/C
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// k / 255 * 1.1 * 1000 / 10 + 2
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// Serial.println((float)k * 0.43137254 + 2);
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// pinMode(A3, OUTPUT);
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/*float *f = malloc(sizeof(f));
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*f = float_test();
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for (int i = 0; i < 4; i++) {
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Serial.print(((unsigned char*)f)[i]);
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Serial.print(" ");
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}
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Serial.print(" => ");
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Serial.print(*f, 8);
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Serial.println();*/
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// uint16_t k = read_temp(A3);
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// Serial.println((float)k / 1023 * 1.1 * 1000 / 10 + 2);
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// Serial.println((float)k * 0.10752688 + 2);
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uint8_t t = lm35_read();
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printPortsStatus();
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Serial.println(t);
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//Serial.print(" vs ");
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}
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