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