102 lines
2.3 KiB
C
102 lines
2.3 KiB
C
#include <stdint.h>
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#include <stdbool.h>
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#include <avr/io.h>
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#include "config.h"
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#include "pump.h"
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#include "twi.h"
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#define BUFFER_SIZE 4
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static uint8_t twiBuffer[BUFFER_SIZE] = {0};
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static uint8_t bufferIndex = 0;
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bool respondFlag = false;
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static inline void twiReset(void) {
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// Enable TWI; enable ACK; clear interrupt flag; enable twi external interrupt
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TWCR = (1 << TWEN) | (1 << TWEA) | (1 << TWINT) | (1 << TWIE);
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}
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void twiInit(void) {
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TWAR = ((eepromRead(TWI_ADDR)) << 1); //address definition found in config.h
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twiReset();
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}
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static inline void twiSendAck(void) {
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TWCR = (1 << TWEA) | (1 << TWINT);
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}
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static inline void twiSendNack(void) {
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TWCR = (TWCR & ~(1 << TWEA)) | (1 << TWINT);
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}
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static void twiSendData(uint8_t data) {
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TWDR = data;
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twiSendAck();
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}
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void twiRespond(void) {
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if (!respondFlag) return;
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uint8_t cmd = twiBuffer[0];
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uint8_t param = twiBuffer[1];
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switch(cmd) {
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// READ
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case 0x01:
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twiSendData(*pLastMoistureVal);
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break;
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case 0x02:
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twiSendData(eepromRead(SENSOR_READINGS));
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break;
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case 0x03:
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twiSendData(eepromRead(MOISTURE_MIN));
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break;
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case 0x04:
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twiSendData(eepromRead(MOISTURE_MAX));
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break;
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// WRITE
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case 0x05:
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eepromWrite(SENSOR_READINGS, param);
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twiSendAck();
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break;
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case 0x06:
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eepromWrite(MOISTURE_MIN, param);
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twiSendAck();
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break;
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case 0x07:
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eepromWrite(MOISTURE_MAX, param);
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twiSendAck();
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break;
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case 0x08:
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waterPlant();
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twiSendAck();
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break;
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default:
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twiSendNack();
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break;
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}
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}
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void twiListen(void) {
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switch (TWSR & 0xF8) {
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case 0x60: // SLA+W received
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bufferIndex = 0;
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twiSendAck();
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break;
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case 0x80: // data received
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if(bufferIndex < BUFFER_SIZE) {
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twiBuffer[bufferIndex++] = TWDR;
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twiSendAck();
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} else twiSendNack();
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break;
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case 0xA0: // stop condition
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respondFlag = true;
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twiReset();
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break;
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default:
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twiSendNack();
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break;
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}
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}
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