86 lines
2.1 KiB
C++
86 lines
2.1 KiB
C++
#include "SHAL.h"
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#include "stm32f0xx.h"
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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_UART2.sendString("Hello\r\n");
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SHAL_delay_ms(100);
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uint8_t buffer[7] = {0};
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SHAL_UART2.sendString("Buffer created?\r\n");
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//Read 7 bytes (status + 5 data + CRC)
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SHAL_I2C1.masterRead(0x38, buffer, 7);
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SHAL_UART2.sendString("Read complete\r\n");
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//Parse humidity (20 bits)
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uint32_t rawHumidity = ((uint32_t)buffer[1] << 12) |
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((uint32_t)buffer[2] << 4) |
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((uint32_t)buffer[3] >> 4);
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// Parse temperature (20 bits)
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uint32_t rawTemp = (((uint32_t)buffer[3] & 0x0F) << 16) |
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((uint32_t)buffer[4] << 8) |
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((uint32_t)buffer[5]);
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float humidity = (rawHumidity * 100.0f) / 1048576.0f; // 2^20 = 1048576
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float temperature = (rawTemp * 200.0f) / 1048576.0f - 50.0f;
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char buf[64];
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sprintf(buf, "Temp: %.2f C, Hum: %.2f %%\r\n", temperature, humidity);
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SHAL_UART2.sendString(buf);
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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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//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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