92 lines
2.3 KiB
C++
92 lines
2.3 KiB
C++
#include "SHAL.h"
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#include "stm32f0xx.h"
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#include <cstdlib>
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void c3Interrupt(){
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SHAL_UART2.sendString("Begin\r\n");
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uint8_t cmd[3] = {0xAC, 0x33, 0x00};
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SHAL_I2C1.masterWrite(0x38, cmd, 3);
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SHAL_delay_ms(100);
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uint8_t dht_buf[7] = {0};
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//Read 7 bytes (status + 5 data + CRC)
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SHAL_I2C1.masterRead(0x38, dht_buf, 7);
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//Parse humidity (20 bits)
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uint32_t rawHumidity = ((uint32_t)dht_buf[1] << 12) |
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((uint32_t)dht_buf[2] << 4) |
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((uint32_t)dht_buf[3] >> 4);
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uint32_t rawTemp = (((uint32_t)dht_buf[3] & 0x0F) << 16) |
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((uint32_t)dht_buf[4] << 8) |
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((uint32_t)dht_buf[5]);
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// Use 64-bit intermediate to avoid overflow
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uint32_t hum_hundredths = (uint32_t)(((uint64_t)rawHumidity * 10000ULL) >> 20);
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int32_t temp_hundredths = (int32_t)((((uint64_t)rawTemp * 20000ULL) >> 20) - 5000);
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char out[80];
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sprintf(out, "rawH=0x%05lX rawT=0x%05lX\r\n",
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(unsigned long)rawHumidity, (unsigned long)rawTemp);
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SHAL_UART2.sendString(out);
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// print as X.YY
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sprintf(out, "Temp: %ld.%02ld C, Hum: %ld.%02ld %%\r\n",
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(long)(temp_hundredths / 100), (long)(abs(temp_hundredths % 100)),
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(long)(hum_hundredths / 100), (long)(hum_hundredths % 100));
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SHAL_UART2.sendString(out);
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}
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void tim2Handler(){
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PIN(A4).toggle();
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}
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int main() {
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SHAL_init();
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//Setup UART2 (used by nucleo devices for USB comms)
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SHAL_UART2.init(UART_Pair::Tx2A2_Rx2A3);
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SHAL_UART2.begin(115200);
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SHAL_I2C1.init(I2C_Pair::SCL1B6_SDA1B7);
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SHAL_I2C1.setClockConfig(0x2000090E);
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//Use pin C3 to trigger a function on external interrupt
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PIN(C3).useAsExternalInterrupt(TriggerMode::RISING_EDGE,c3Interrupt);
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SHAL_TIM2.init(8000-1,1500-1);
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SHAL_TIM2.setCallbackFunc(tim2Handler);
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SHAL_TIM2.start();
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PIN(A4).setPinMode(PinMode::OUTPUT_MODE);
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PIN(A5).setPinMode(PinMode::OUTPUT_MODE);
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SHAL_delay_ms(3000); //Wait 100 ms from datasheet
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uint8_t cmd = 0x71;
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uint8_t status = 0;
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SHAL_I2C1.masterWriteRead(0x38, &cmd, 1, &status, 1);
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char statusString[32];
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sprintf(statusString, "Status = 0x%02X\r\n", status);
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SHAL_UART2.sendString(statusString);
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SHAL_delay_ms(10);
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c3Interrupt();
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//End setup
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while (true) {
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__WFI();
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}
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}
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