zh_avr_i2c

AVR library for I2C bus.

#include "avr/io.h" #include "stdio.h" #include "zh_avr_i2c.h"

#define BAUD_RATE 9600 #define BAUD_PRESCALE (F_CPU / 16 / BAUD_RATE - 1)

int usart(char byte, FILE *stream) { while ((UCSR0A & (1 << UDRE0)) == 0) { } UDR0 = byte; return 0; } FILE uart = FDEV_SETUP_STREAM(usart, NULL, _FDEV_SETUP_WRITE);

void i2c_example_task(void *pvParameters) { zh_avr_i2c_master_init(false); avr_err_t err = zh_avr_i2c_master_probe(0x38, 100 / portTICK_PERIOD_MS); switch (err) { case AVR_OK: printf("Slave Answered.\n"); break; case AVR_ERR_INVALID_RESPONSE: printf("Slave Not Answer.\n"); break; default: printf("Bus Error.\n"); break; } vTaskDelete(NULL); }

int main(void) { UBRR0H = (BAUD_PRESCALE >> 8); UBRR0L = BAUD_PRESCALE; UCSR0B = (1 << RXEN0) | (1 << TXEN0); UCSR0C = (1 << UCSZ01) | (1 << UCSZ00); stdout = &uart; xTaskCreate(i2c_example_task, "i2c example task", configMINIMAL_STACK_SIZE, NULL, tskIDLE_PRIORITY, NULL); vTaskStartScheduler(); return 0; }