106 lines
2.5 KiB
C
106 lines
2.5 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: Get readings from ADC ADS1115 over I2C.
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// TODO: Implement optional sensor value check with CRC8.
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// TODO: Set timeouts for polling based things like I2C.
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// TODO: Write an improved serial parser (low priority).
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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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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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// 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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void Update(void)
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{
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float temp, rhum;
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I2C_SetChannel(AHT01);
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if (I2C_AHT20_Read(&temp, &rhum))
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Info("TEMP=%.2fC, RHUM=%.2f%", temp, rhum);
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I2C_SetChannel(AHT02);
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if (I2C_AHT20_Read(&temp, &rhum))
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Info("TEMP=%.2fC, RHUM=%.2f%", temp, rhum);
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I2C_SetChannel(AHT03);
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if (I2C_AHT20_Read(&temp, &rhum))
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Info("TEMP=%.2fC, RHUM=%.2f%", temp, rhum);
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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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Update();
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Sleep(1000);
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}
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return 0;
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}
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