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https://github.com/UberGuidoZ/Flipper.git
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43 lines
1.7 KiB
C
43 lines
1.7 KiB
C
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#ifndef WII_I2C_H_
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#define WII_I2C_H_
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#include <stdint.h>
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//#include "wii_ec.h"
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//----------------------------------------------------------------------------- ----------------------------------------
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// i2c bus details
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//
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// https://www.best-microcontroller-projects.com/i2c-tutorial.html
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// https://web.archive.org/web/20220000000000*/https://www.best-microcontroller-projects.com/i2c-tutorial.html
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// https://training.ti.com/introduction-i2c-reserved-addresses
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//
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// After the (special) START "bit"...
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// the first 8bits (byte) of i2c data are the 7bit i2c Address,
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// FOLLOWED by 1bit to signify a READ or WRITE {0=write, 1=read}
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// The data is transmitted BIG-Endian, IE. MSb first [human readable]
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// So the address actually lives in the TOP (MSb's) of the first "byte", (with bit0 being used as the read/write flag)
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//
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// The read() and write() functions on the FZ will set the LSb appropriately,
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// BUT they do NOT shift the address left to make room for it!
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// So the address you give to read/write() MUST be given as (7bitAddress << 1)
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//
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// When we read: After we send the read command, we wait for i2cReadWait uS before reading the data
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//
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// firmware/targets/f7/furi_hal/furi_hal_i2c_types.h
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#define i2cBus (&furi_hal_i2c_handle_external) // FZ external i2c bus
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#define i2cAddr (ec_i2cAddr << 1)
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#define i2cTimeout (3) // in mS
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#define i2cReadWait (300) //! 300uS: how low can we take this?
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//----------------------------------------------------------------------------- ----------------------------------------
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// public functions
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//
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typedef struct wiiEC wiiEC_t ;
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bool ecInit (wiiEC_t* const pec, const uint8_t* encKey) ;
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int ecRead (wiiEC_t* const pec) ;
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#endif //WII_I2C_H_
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