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95 lines
2.7 KiB
95 lines
2.7 KiB
#include "i2c.h"
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#include "usart.h"
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void i2c_init(i2c_t *i2c_dev)
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{
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i2c_dev->hardwareState = i2c_hw_disabled;
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i2c_dev->periferalState = i2c_perif_disabled;
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i2c_hardware_enable(i2c_dev);
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i2c_periferal_disable(i2c_dev); // Just to be sure as periferal configuration can not be dont when active.
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i2c_set_filter(i2c_dev,1);
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i2c_set_clk_stretch(i2c_dev, i2c_dev->stretching);
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i2c_set_clk_speed(i2c_dev, i2c_dev->speed);
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i2c_set_mode(i2c_dev, i2c_dev->mode);
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i2c_set_address_lenght(i2c_dev, i2c_dev->addressSize);
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i2c_set_address(i2c_dev, i2c_dev->mainAddress);
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i2c_set_address_second(i2c_dev, i2c_dev->secondAddress);
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i2c_periferal_enable(i2c_dev);
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}
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void i2c_read(i2c_t *i2c_dev, uint16_t *slaveAddress, uint8_t *registerAddress, uint8_t *data, uint8_t *dataLenght)
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{
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i2c_dev->periferalState = i2c_perif_read;
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// Arch nemesis ! We only setn the address
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// but the counter allso socunt the bits that we have recieved
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// and we want to read one byte
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// every transaction counts
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i2c_set_transfer_counter(i2c_dev,1);
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i2c_send_address_for_write(i2c_dev, slaveAddress);
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i2c_send_reg_address(i2c_dev, registerAddress);
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while(!i2c_is_transfer_complete(i2c_dev));
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//i2c_set_transfer_counter(i2c_dev,2);
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i2c_send_address_for_read(i2c_dev, slaveAddress);
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i2c_get_input_register(i2c_dev, data);
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while(!i2c_is_transfer_complete(i2c_dev));
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i2c_send_nack(i2c_dev);
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i2c_send_stop(i2c_dev);
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while(!i2c_is_perif_ready(i2c_dev));
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}
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void i2c_write(i2c_t *i2c_dev, uint16_t *slaveAddress, uint8_t *registerAddress, uint8_t *data, uint8_t *dataLenght)
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{
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uint8_t i = *dataLenght + 1 ;
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i2c_dev->periferalState = i2c_perif_write;
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i2c_set_transfer_counter(i2c_dev,i);
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i2c_send_address_for_write(i2c_dev, slaveAddress);
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i2c_send_reg_address(i2c_dev, registerAddress);
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for(i = 0; i < *dataLenght; i++)
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{
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i2c_send_data(i2c_dev, data);
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}
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while(!i2c_is_transfer_complete(i2c_dev));
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i2c_send_stop(i2c_dev);
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while(!i2c_is_perif_ready(i2c_dev));
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}
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uint8_t i2c_check_device(i2c_t *i2c_dev, uint16_t *device)
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{
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i2c_dev->periferalState = i2c_perif_write;
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i2c_set_transfer_counter(i2c_dev,0);
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i2c_send_address_for_write(i2c_dev, device);
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if(i2c_check_nack(i2c_dev))
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{
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i2c_dev->hardwareState = i2c_hw_got_nack;
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i2c_throw_error(i2c_dev,1);
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return 0;
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}
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i2c_dev->hardwareState = i2c_hw_got_ack;
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return 1;
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}
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uint8_t i2c_discover_devices(i2c_t *i2c_dev)
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{
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uint16_t i = 0;
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for(i = 0x03; i <= 0x77; i++)
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{
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i2c_check_device(i2c_dev,&i);
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}
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return 1;
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}
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void i2c_throw_error(i2c_t *i2c_dev, uint8_t error)
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{
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print_Usart(usart2, "\n\r");
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print_Usart(usart2, "I2C : Error");
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print_Usart(usart2, "\n\r");
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if(error == 1)
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{
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print_Usart(usart2, " -> Device not Found ");
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print_Usart(usart2, "\n\r");
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}
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}
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