51 lines
1.0 KiB
Markdown
51 lines
1.0 KiB
Markdown
# zh_avr_i2c
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AVR library for I2C bus.
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#include "avr/io.h"
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#include "stdio.h"
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#include "zh_avr_i2c.h"
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#define BAUD_RATE 9600
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#define BAUD_PRESCALE (F_CPU / 16 / BAUD_RATE - 1)
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int usart(char byte, FILE *stream)
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{
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while ((UCSR0A & (1 << UDRE0)) == 0)
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{
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}
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UDR0 = byte;
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return 0;
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}
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FILE uart = FDEV_SETUP_STREAM(usart, NULL, _FDEV_SETUP_WRITE);
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void i2c_example_task(void *pvParameters)
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{
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zh_avr_i2c_master_init(false);
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avr_err_t err = zh_avr_i2c_master_probe(0x38, 100 / portTICK_PERIOD_MS);
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switch (err)
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{
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case AVR_OK:
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printf("Slave Answered.\n");
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break;
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case AVR_ERR_INVALID_RESPONSE:
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printf("Slave Not Answer.\n");
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break;
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default:
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printf("Bus Error.\n");
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break;
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}
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vTaskDelete(NULL);
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}
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int main(void)
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{
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UBRR0H = (BAUD_PRESCALE >> 8);
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UBRR0L = BAUD_PRESCALE;
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UCSR0B = (1 << RXEN0) | (1 << TXEN0);
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UCSR0C = (1 << UCSZ01) | (1 << UCSZ00);
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stdout = &uart;
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xTaskCreate(i2c_example_task, "i2c example task", configMINIMAL_STACK_SIZE, NULL, tskIDLE_PRIORITY, NULL);
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vTaskStartScheduler();
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return 0;
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} |