137 lines
3.6 KiB
C
137 lines
3.6 KiB
C
#include "common.h"
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#include "bus/usart.h"
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#include "bus/mosfet.h"
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#include "bus/pwm.h"
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#include "bus/i2c.h"
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#include <avr/interrupt.h>
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// TODO: Implement optional CRC8 sensor measurement check.
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// TODO: Either implement software PWM for the FAN03 timer
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// (which will be quite complicated) or pick a chip with
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// more than two 16-bit PWM outputs like the ATmega328PB.
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// https://www.mikrocontroller.net/articles/Soft-PWM
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// TODO: Check if FAN02 is receiving the right frequency.
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// TODO: Write an improved command parser (low priority).
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// TODO: Proper error handling and recovery (after testing).
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static int Init(void)
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{
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// MOSFETS control things like the heating element
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// so they are the highest priority to initialize
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// to a default state via MOS_Init().
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MOS_Init();
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// The serial interface is required for output
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// functions like Info() and Error() and it uses
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// IRQs, so we need to initialize it as soon as
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// possible and make sure to enable interrupts.
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USART_Init();
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sei();
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Info("Initializing...");
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// The watchdog timer is clocked from a separate
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// on-chip oscillator which runs at 1 MHz. Eight
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// different clock cycle periods can be selected
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// to determine the reset period. If the reset
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// period expires, the chip resets and executes
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// from the reset vector.
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// The update loop must call WDT_Reset to reset
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// the timer, kind of like a dead man's switch
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// allowing us to detect infinite loops and any
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// other error that halts execution.
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if (WDT_HasTriggered())
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Info("Unexpected system reset.");
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WDT_Enable();
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WDT_SetTimeoutFlag(WDT2000); // 2 seconds
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// There is a possiblity to use interrupt signals
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// for I2C communication but only as one large
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// branching routine for the whole I2C system.
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// The blocking approach used right now is fine.
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I2C_Init();
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PWM_Init();
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MOS_Enable(MOS03);
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// MOS_Disable(MOS01);
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// Only FAN01 and FAN02 are receiving the correct
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// frequency (25 KHz) right now. The 16-bit timer on
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// the ATMega32A has two outputs so it would require
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// software PWM to have a variable frequency on PD7.
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// A simple implementation will take up around 30-50
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// percent of CPU time. Faster approaches are quite
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// complicated so it might be worth it to switch to
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// something like an ATmega328PB.
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PWM_SetValue(FAN01, 50); // Fan Peltier Hot side
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PWM_SetValue(FAN02, 50); // Fan Peltier Cold Side
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// PWM_SetValue(FAN03, 20); // Fan Heating
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// The I2C_SetChannel command changes the channel
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// setting of the PCA9546 I2C multiplexer. Any
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// command after it will be sent to the device
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// listening on that channel.
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I2C_SetChannel(AHT01);
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I2C_AHT20_Init();
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I2C_SetChannel(AHT02);
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I2C_AHT20_Init();
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I2C_SetChannel(AHT03);
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I2C_AHT20_Init();
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return 0;
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}
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static void Update(void)
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{
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float temp[3], rh[3];
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float adct[3];
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Info("Reading sensor values...");
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I2C_SetChannel(AHT01);
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I2C_AHT20_Read(&temp[0], &rh[0]);
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I2C_SetChannel(AHT02);
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I2C_AHT20_Read(&temp[1], &rh[1]);
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I2C_SetChannel(AHT03);
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I2C_AHT20_Read(&temp[2], &rh[2]);
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Sleep(200); // FIXME: Poll config register until BIT(15) == 1
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adct[0] = I2C_ADS1115_ReadThermistor(ADS01);
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Sleep(200); // FIXME: Remove me - see above.
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adct[1] = I2C_ADS1115_ReadThermistor(ADS02);
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Sleep(200); // FIXME: Remove me - see above.
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adct[2] = I2C_ADS1115_ReadThermistor(ADS03);
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Info("TEMP0=%.2fC, TEMP1=%.2fC, TEMP2=%.2fC", temp[0], temp[1], temp[2]);
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Info("ADCT0=%.2fC, ADCT1=%.2fC, ADCT2=%.2fC", adct[0], adct[1], adct[2]);
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Info("RH0=%.2f%%, RH1=%.2f%%, RH2=%.2f%%", rh[0], rh[1], rh[2]);
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}
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int main(void)
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{
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Init();
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for (;;) {
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WDT_Reset();
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Update();
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WDT_Reset();
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Sleep(1000);
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}
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return 0;
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}
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