forked from mirrors/qmk_firmware
Refactor use of legacy i2c implementation (#14341)
This commit is contained in:
Joel Challis
GitHub
parent
2d6635214a
commit
e7a5c006d9
6 changed files with 23 additions and 419 deletions
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@ -1,178 +0,0 @@
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#ifndef _I2CMASTER_H
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#define _I2CMASTER_H 1
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/*************************************************************************
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* Title: C include file for the I2C master interface
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* (i2cmaster.S or twimaster.c)
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* Author: Peter Fleury <pfleury@gmx.ch> http://jump.to/fleury
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* File: $Id: i2cmaster.h,v 1.10 2005/03/06 22:39:57 Peter Exp $
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* Software: AVR-GCC 3.4.3 / avr-libc 1.2.3
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* Target: any AVR device
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* Usage: see Doxygen manual
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**************************************************************************/
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#ifdef DOXYGEN
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/**
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@defgroup pfleury_ic2master I2C Master library
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@code #include <i2cmaster.h> @endcode
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@brief I2C (TWI) Master Software Library
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Basic routines for communicating with I2C slave devices. This single master
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implementation is limited to one bus master on the I2C bus.
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This I2c library is implemented as a compact assembler software implementation of the I2C protocol
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which runs on any AVR (i2cmaster.S) and as a TWI hardware interface for all AVR with built-in TWI hardware (twimaster.c).
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Since the API for these two implementations is exactly the same, an application can be linked either against the
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software I2C implementation or the hardware I2C implementation.
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Use 4.7k pull-up resistor on the SDA and SCL pin.
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Adapt the SCL and SDA port and pin definitions and eventually the delay routine in the module
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i2cmaster.S to your target when using the software I2C implementation !
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Adjust the CPU clock frequence F_CPU in twimaster.c or in the Makfile when using the TWI hardware implementaion.
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@note
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The module i2cmaster.S is based on the Atmel Application Note AVR300, corrected and adapted
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to GNU assembler and AVR-GCC C call interface.
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Replaced the incorrect quarter period delays found in AVR300 with
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half period delays.
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@author Peter Fleury pfleury@gmx.ch http://jump.to/fleury
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@par API Usage Example
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The following code shows typical usage of this library, see example test_i2cmaster.c
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@code
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#include <i2cmaster.h>
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#define Dev24C02 0xA2 // device address of EEPROM 24C02, see datasheet
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int main(void)
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{
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unsigned char ret;
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i2c_init(); // initialize I2C library
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// write 0x75 to EEPROM address 5 (Byte Write)
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i2c_start_wait(Dev24C02+I2C_WRITE); // set device address and write mode
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i2c_write(0x05); // write address = 5
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i2c_write(0x75); // write value 0x75 to EEPROM
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i2c_stop(); // set stop conditon = release bus
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// read previously written value back from EEPROM address 5
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i2c_start_wait(Dev24C02+I2C_WRITE); // set device address and write mode
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i2c_write(0x05); // write address = 5
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i2c_rep_start(Dev24C02+I2C_READ); // set device address and read mode
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ret = i2c_readNak(); // read one byte from EEPROM
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i2c_stop();
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for(;;);
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}
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@endcode
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*/
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#endif /* DOXYGEN */
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/**@{*/
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#if (__GNUC__ * 100 + __GNUC_MINOR__) < 304
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#error "This library requires AVR-GCC 3.4 or later, update to newer AVR-GCC compiler !"
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#endif
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#include <avr/io.h>
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/** defines the data direction (reading from I2C device) in i2c_start(),i2c_rep_start() */
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#define I2C_READ 1
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/** defines the data direction (writing to I2C device) in i2c_start(),i2c_rep_start() */
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#define I2C_WRITE 0
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/**
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@brief initialize the I2C master interace. Need to be called only once
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@param void
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@return none
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*/
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extern void i2c_init(void);
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/**
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@brief Terminates the data transfer and releases the I2C bus
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@param void
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@return none
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*/
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extern void i2c_stop(void);
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/**
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@brief Issues a start condition and sends address and transfer direction
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@param addr address and transfer direction of I2C device
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@retval 0 device accessible
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@retval 1 failed to access device
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*/
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extern unsigned char i2c_start(unsigned char addr);
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/**
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@brief Issues a repeated start condition and sends address and transfer direction
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@param addr address and transfer direction of I2C device
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@retval 0 device accessible
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@retval 1 failed to access device
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*/
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extern unsigned char i2c_rep_start(unsigned char addr);
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/**
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@brief Issues a start condition and sends address and transfer direction
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If device is busy, use ack polling to wait until device ready
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@param addr address and transfer direction of I2C device
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@return none
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*/
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extern void i2c_start_wait(unsigned char addr);
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/**
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@brief Send one byte to I2C device
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@param data byte to be transfered
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@retval 0 write successful
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@retval 1 write failed
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*/
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extern unsigned char i2c_write(unsigned char data);
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/**
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@brief read one byte from the I2C device, request more data from device
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@return byte read from I2C device
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*/
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extern unsigned char i2c_readAck(void);
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/**
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@brief read one byte from the I2C device, read is followed by a stop condition
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@return byte read from I2C device
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*/
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extern unsigned char i2c_readNak(void);
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/**
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@brief read one byte from the I2C device
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Implemented as a macro, which calls either i2c_readAck or i2c_readNak
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@param ack 1 send ack, request more data from device<br>
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0 send nak, read is followed by a stop condition
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@return byte read from I2C device
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*/
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extern unsigned char i2c_read(unsigned char ack);
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#define i2c_read(ack) (ack) ? i2c_readAck() : i2c_readNak();
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/**@}*/
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#endif
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@ -243,15 +243,11 @@ static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row)
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/* if there was an error */
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return 0;
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} else {
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uint16_t data = 0;
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mcp23018_status = i2c_start(I2C_ADDR_WRITE); if (mcp23018_status) goto out;
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mcp23018_status = i2c_write(GPIOA); if (mcp23018_status) goto out;
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mcp23018_status = i2c_start(I2C_ADDR_READ); if (mcp23018_status) goto out;
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data = i2c_readNak();
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data = ~data;
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out:
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i2c_stop();
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current_matrix[current_row] |= (data << 8);
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uint8_t data = 0;
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mcp23018_status = i2c_readReg(I2C_ADDR, GPIOA, &data, 1, I2C_TIMEOUT);
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if (!mcp23018_status) {
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current_matrix[current_row] |= (~((uint16_t)data) << 8);
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}
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}
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/* For each col... */
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@ -278,11 +274,8 @@ static void select_row(uint8_t row)
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/* set active row low : 0
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set active row output : 1
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set other rows hi-Z : 1 */
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mcp23018_status = i2c_start(I2C_ADDR_WRITE); if (mcp23018_status) goto out;
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mcp23018_status = i2c_write(GPIOB); if (mcp23018_status) goto out;
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mcp23018_status = i2c_write(0xFF & ~(1<<abs(row-4))); if (mcp23018_status) goto out;
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out:
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i2c_stop();
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uint8_t port = 0xFF & ~(1<<abs(row-4));
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mcp23018_status = i2c_writeReg(I2C_ADDR, GPIOB, &port, 1, I2C_TIMEOUT);
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}
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uint8_t pin = row_pins[row];
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@ -27,5 +27,5 @@ RGBLIGHT_ENABLE = no
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CUSTOM_MATRIX = yes
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# project specific files
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SRC = twimaster.c \
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matrix.c
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QUANTUM_LIB_SRC += i2c_master.c
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SRC += matrix.c
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@ -1,5 +1,5 @@
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#include "sx60.h"
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#include "i2cmaster.h"
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#include "i2c_master.h"
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bool i2c_initialized = 0;
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@ -18,21 +18,18 @@ uint8_t init_mcp23018(void) {
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/* B Pins are Row, A pins are Columns
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Set them to output */
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mcp23018_status = i2c_start(I2C_ADDR_WRITE); if (mcp23018_status) goto out;
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mcp23018_status = i2c_write(IODIRA); if (mcp23018_status) goto out;
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mcp23018_status = i2c_write(0b11111111); if (mcp23018_status) goto out;
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/* Now write to IODIRB */
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mcp23018_status = i2c_write(0b00000000); if (mcp23018_status) goto out;
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i2c_stop();
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static uint8_t direction[2] = {
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0b11111111,
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0b00000000,
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};
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static uint8_t pullup[2] = {
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0b11111111,
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0b00000000,
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};
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mcp23018_status = i2c_start(I2C_ADDR_WRITE); if (mcp23018_status) goto out;
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mcp23018_status = i2c_write(GPPUA); if (mcp23018_status) goto out;
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mcp23018_status = i2c_write(0b11111111); if (mcp23018_status) goto out;
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/* Now write to GPPUB */
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mcp23018_status = i2c_write(0b00000000); if (mcp23018_status) goto out;
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out:
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i2c_stop();
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mcp23018_status = i2c_writeReg(I2C_ADDR, IODIRA, direction, 2, I2C_TIMEOUT);
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if (mcp23018_status) return mcp23018_status;
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mcp23018_status = i2c_writeReg(I2C_ADDR, GPPUA, pullup, 2, I2C_TIMEOUT);
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return mcp23018_status;
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}
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@ -4,13 +4,12 @@
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#include "quantum.h"
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#include <stdint.h>
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#include <stdbool.h>
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#include "i2cmaster.h"
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#include "i2c_master.h"
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#include <util/delay.h>
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/* I2C aliases and register addresses (see "mcp23018.md") */
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#define I2C_ADDR 0b0100000
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#define I2C_ADDR_WRITE ( (I2C_ADDR<<1) | I2C_WRITE )
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#define I2C_ADDR_READ ( (I2C_ADDR<<1) | I2C_READ )
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#define I2C_TIMEOUT 100
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#define IODIRA 0x00 /* i/o direction register */
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#define IODIRB 0x01
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#define GPPUA 0x0C /* GPIO pull-up resistor register */
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@ -1,207 +0,0 @@
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/*************************************************************************
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* Title: I2C master library using hardware TWI interface
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* Author: Peter Fleury <pfleury@gmx.ch> http://jump.to/fleury
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* File: $Id: twimaster.c,v 1.3 2005/07/02 11:14:21 Peter Exp $
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* Software: AVR-GCC 3.4.3 / avr-libc 1.2.3
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* Target: any AVR device with hardware TWI
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* Usage: API compatible with I2C Software Library i2cmaster.h
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**************************************************************************/
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#include <inttypes.h>
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#include <compat/twi.h>
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#include <i2cmaster.h>
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/* define CPU frequency in Hz here if not defined in Makefile */
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#ifndef F_CPU
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#define F_CPU 16000000UL
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#endif
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/* I2C clock in Hz */
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#define SCL_CLOCK 400000L
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/*************************************************************************
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Initialization of the I2C bus interface. Need to be called only once
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*************************************************************************/
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void i2c_init(void)
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{
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/* initialize TWI clock
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* minimal values in Bit Rate Register (TWBR) and minimal Prescaler
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* bits in the TWI Status Register should give us maximal possible
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* I2C bus speed - about 444 kHz
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*
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* for more details, see 20.5.2 in ATmega16/32 secification
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*/
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TWSR = 0; /* no prescaler */
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TWBR = 10; /* must be >= 10 for stable operation */
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}/* i2c_init */
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/*************************************************************************
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Issues a start condition and sends address and transfer direction.
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return 0 = device accessible, 1= failed to access device
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*************************************************************************/
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unsigned char i2c_start(unsigned char address)
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{
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uint8_t twst;
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/* send START condition */
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TWCR = (1<<TWINT) | (1<<TWSTA) | (1<<TWEN);
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/* wait until transmission completed */
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while(!(TWCR & (1<<TWINT)));
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/* check value of TWI Status Register. Mask prescaler bits. */
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twst = TW_STATUS & 0xF8;
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if ( (twst != TW_START) && (twst != TW_REP_START)) return 1;
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/* send device address */
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TWDR = address;
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TWCR = (1<<TWINT) | (1<<TWEN);
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/* wail until transmission completed and ACK/NACK has been received */
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while(!(TWCR & (1<<TWINT)));
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/* check value of TWI Status Register. Mask prescaler bits. */
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twst = TW_STATUS & 0xF8;
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if ( (twst != TW_MT_SLA_ACK) && (twst != TW_MR_SLA_ACK) ) return 1;
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return 0;
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}/* i2c_start */
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/*************************************************************************
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Issues a start condition and sends address and transfer direction.
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If device is busy, use ack polling to wait until device is ready
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Input: address and transfer direction of I2C device
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*************************************************************************/
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void i2c_start_wait(unsigned char address)
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{
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uint8_t twst;
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while ( 1 )
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{
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/* send START condition */
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TWCR = (1<<TWINT) | (1<<TWSTA) | (1<<TWEN);
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/* wait until transmission completed */
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while(!(TWCR & (1<<TWINT)));
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/* check value of TWI Status Register. Mask prescaler bits. */
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twst = TW_STATUS & 0xF8;
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if ( (twst != TW_START) && (twst != TW_REP_START)) continue;
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/* send device address */
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TWDR = address;
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TWCR = (1<<TWINT) | (1<<TWEN);
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/* wail until transmission completed */
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while(!(TWCR & (1<<TWINT)));
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/* check value of TWI Status Register. Mask prescaler bits. */
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twst = TW_STATUS & 0xF8;
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if ( (twst == TW_MT_SLA_NACK )||(twst ==TW_MR_DATA_NACK) )
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{
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/* device busy, send stop condition to terminate write operation */
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TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTO);
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/* wait until stop condition is executed and bus released */
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while(TWCR & (1<<TWSTO));
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continue;
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}
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break;
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}
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}/* i2c_start_wait */
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/*************************************************************************
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Issues a repeated start condition and sends address and transfer direction
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Input: address and transfer direction of I2C device
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Return: 0 device accessible
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1 failed to access device
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*************************************************************************/
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unsigned char i2c_rep_start(unsigned char address)
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{
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return i2c_start( address );
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}/* i2c_rep_start */
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/*************************************************************************
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Terminates the data transfer and releases the I2C bus
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*************************************************************************/
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void i2c_stop(void)
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{
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/* send stop condition */
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TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTO);
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/* wait until stop condition is executed and bus released */
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while(TWCR & (1<<TWSTO));
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}/* i2c_stop */
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/*************************************************************************
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Send one byte to I2C device
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Input: byte to be transfered
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Return: 0 write successful
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1 write failed
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*************************************************************************/
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unsigned char i2c_write( unsigned char data )
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{
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uint8_t twst;
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/* send data to the previously addressed device */
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TWDR = data;
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TWCR = (1<<TWINT) | (1<<TWEN);
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/* wait until transmission completed */
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while(!(TWCR & (1<<TWINT)));
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/* check value of TWI Status Register. Mask prescaler bits */
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twst = TW_STATUS & 0xF8;
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if( twst != TW_MT_DATA_ACK) return 1;
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return 0;
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}/* i2c_write */
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/*************************************************************************
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Read one byte from the I2C device, request more data from device
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Return: byte read from I2C device
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*************************************************************************/
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unsigned char i2c_readAck(void)
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{
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TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWEA);
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while(!(TWCR & (1<<TWINT)));
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return TWDR;
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}/* i2c_readAck */
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|
||||
|
||||
/*************************************************************************
|
||||
Read one byte from the I2C device, read is followed by a stop condition
|
||||
|
||||
Return: byte read from I2C device
|
||||
*************************************************************************/
|
||||
unsigned char i2c_readNak(void)
|
||||
{
|
||||
TWCR = (1<<TWINT) | (1<<TWEN);
|
||||
while(!(TWCR & (1<<TWINT)));
|
||||
|
||||
return TWDR;
|
||||
|
||||
}/* i2c_readNak */
|
||||
Loading…
Reference in a new issue