66 lines
3.5 KiB
C
66 lines
3.5 KiB
C
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/* -*- mode: c; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4; coding: utf-8 -*- */
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/************************************************************************************
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** **
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** mcHF QRP Transceiver **
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** K Atanassov - M0NKA 2014 **
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** **
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**---------------------------------------------------------------------------------**
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** **
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** File name: **
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** Description: **
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** Last Modified: **
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** Licence: GNU GPLv3 **
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************************************************************************************/
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#ifndef __MCHF_HW_I2C_H
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#define __MCHF_HW_I2C_H
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#include "i2c.h"
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#define I2C_BUS_SPEED_MULT 20000 // 20kHz is multiplier for config var
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#define I2C1_SPEED_DEFAULT (100000/I2C_BUS_SPEED_MULT) // 20 * 20kHz == 200kHz 400000 does not work, may need resistor mod (now reduced to 100KHz)
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#define I2C2_SPEED_DEFAULT (100000/I2C_BUS_SPEED_MULT) // 10 * 20kHz == 100kHz, was 25000, 400000 does not work, , may need resistor mod
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// Generic Functions for Handling I2C Busses in MCHF
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uint16_t UhsdrHw_I2C_WriteRegister(I2C_HandleTypeDef* i2c, uchar I2CAddr,uint16_t addr,uint16_t addr_size, uchar RegisterValue);
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uint16_t UhsdrHw_I2C_WriteBlock(I2C_HandleTypeDef* i2c, uchar I2CAddr, uint16_t addr, uint16_t addr_size, const uint8_t* data, uint32_t size);
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uint16_t UhsdrHw_I2C_ReadRegister(I2C_HandleTypeDef* i2c, uchar I2CAddr, uint16_t addr, uint16_t addr_size, uint8_t *RegisterValue);
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uint16_t UhsdrHw_I2C_ReadBlock(I2C_HandleTypeDef* i2c, uchar I2CAddr,uint16_t addr, uint16_t addr_size, uint8_t *data, uint32_t size);
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uint16_t UhsdrHw_I2C_DeviceReady(I2C_HandleTypeDef* hi2c, uchar I2CAddr);
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#ifdef STM32F4
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// Special init and wrapper functions for I2C Bus 1
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void UhsdrHw_I2C_ChangeSpeed(I2C_HandleTypeDef* hi2c);
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#endif
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// Flags do not really need a timeout according to my testing.
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#define MCHF_I2C_FLAG_TIMEOUT ((uint32_t)1)
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// Event timeout according to testing is depending on the actual speed of the bus
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// 200 kHz Bus -> 100 would be sufficient
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// 100 kHz Bus -> 200, 50kHz -> 400, 25kHz -> 800
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// other place I saw 20000 used as timeout
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#define MCHF_I2C_LONG_TIMEOUT ((uint32_t)1000)
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// extern uint32_t i2c_flag_timeout_max; // lower values, higher timeout!
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extern uint32_t i2c_event_timeout_max; // lower values, higher timeout!
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#define I2C_FlagStatusOrReturn(BUS, FLAG, RETURN) { \
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uint32_t timeout = MCHF_I2C_FLAG_TIMEOUT;\
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while(I2C_GetFlagStatus((BUS), (FLAG)))\
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{ if ((timeout--) == 0) { return (RETURN); } } \
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/* if (timeout < i2c_flag_timeout_max){ i2c_flag_timeout_max = timeout; }*/ \
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}
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#define I2C_EventCompleteOrReturn(BUS,EVENT, RETURN) { \
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uint32_t timeout = MCHF_I2C_LONG_TIMEOUT;\
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while(!I2C_CheckEvent((BUS), (EVENT)))\
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{ if ((timeout--) == 0) { return (RETURN); } } \
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if (timeout < i2c_event_timeout_max){ i2c_event_timeout_max = timeout; } }
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#endif
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