67 lines
2.0 KiB
Markdown
67 lines
2.0 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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for (;;)
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{
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avr_err_t err = zh_avr_i2c_master_probe(0x38, 100 / portTICK_PERIOD_MS);
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if (err == AVR_OK)
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{
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uint8_t data_send = 111;
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uint8_t data_read = 0;
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printf("Data Send %d.\n", data_send);
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zh_avr_i2c_master_transmit(0x38, (uint8_t *)&data_send, sizeof(data_send), 100 / portTICK_PERIOD_MS);
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zh_avr_i2c_master_receive(0x38, (uint8_t *)&data_read, sizeof(data_read), 100 / portTICK_PERIOD_MS);
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printf("Data Read %d.\n", data_read);
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data_send = 55;
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printf("Data Send %d.\n", data_send);
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zh_avr_i2c_master_transmit(0x38, (uint8_t *)&data_send, sizeof(data_send), 100 / portTICK_PERIOD_MS);
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zh_avr_i2c_master_receive(0x38, (uint8_t *)&data_read, sizeof(data_read), 100 / portTICK_PERIOD_MS);
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printf("Data Read %d.\n", data_read);
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data_send = 14;
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printf("Data Send %d.\n", data_send);
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zh_avr_i2c_master_transmit(0x38, (uint8_t *)&data_send, sizeof(data_send), 100 / portTICK_PERIOD_MS);
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zh_avr_i2c_master_receive(0x38, (uint8_t *)&data_read, sizeof(data_read), 100 / portTICK_PERIOD_MS);
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printf("Data Read %d.\n", data_read);
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}
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else
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{
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printf("Device Not Found.\n");
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}
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printf("Task Remaining Stack Size %d.\n", uxTaskGetStackHighWaterMark(NULL));
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vTaskDelay(5000 / portTICK_PERIOD_MS);
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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", 110, NULL, tskIDLE_PRIORITY, NULL);
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vTaskStartScheduler();
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return 0;
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} |