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https://github.com/SMFSW/cI2C
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v1.2: No internal address transmission when reading/writing to next internal address (auto-increment feature of most I2C devices)
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@ -38,7 +38,7 @@ PROJECT_NAME = "Arduino Hardware I2C for AVR MCUs (plain c)"
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# could be handy for archiving the generated documentation or if some version
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# control system is used.
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PROJECT_NUMBER = 1.1
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PROJECT_NUMBER = 1.2
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# Using the PROJECT_BRIEF tag one can provide an optional one line description
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# for a project that appears at the top of each page and should give viewer a
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@ -15,6 +15,9 @@ Feel free to share your thoughts @ xgarmanboziax@gmail.com about:
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------------
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** Actual:
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v1.2 30 Nov 2017:
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- No internal address transmission when reading/writing to next internal address (make sure not to r/w last 16 address right just after init, otherwise make a dummy of address 0 just before)
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v1.1 29 Nov 2017:
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- Frequency calculation fix (thanks to TonyWilk)
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- Set Frequency higher than Fast Mode (400KHz) will set bus to Fast Mode (frequency is up to 400KHz on AVR)
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@ -7,7 +7,7 @@
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This example code is in the public domain.
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created Jan 12 2017
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latest mod Nov 21 2017
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latest mod Nov 30 2017
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by SMFSW
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*/
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@ -66,12 +66,12 @@ bool I2C_wr_advanced(I2C_SLAVE * slave, const uint16_t reg_addr, uint8_t * data,
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{
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if (bytes == 0) { return false; }
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slave->reg_addr = reg_addr;
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if (I2C_start() == false) { return false; }
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if (I2C_sndAddr(slave, I2C_WRITE) == false) { return false; }
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if (slave->cfg.reg_size)
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if ((slave->cfg.reg_size) && (reg_addr != slave->reg_addr)) // Don't send address if writing next
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{
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slave->reg_addr = reg_addr;
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if (slave->cfg.reg_size >= I2C_16B_REG) // if size >2, 16bit address is used
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{
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if (I2C_wr8((uint8_t) (reg_addr >> 8)) == false) { return false; }
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@ -102,10 +102,10 @@ bool I2C_rd_advanced(I2C_SLAVE * slave, const uint16_t reg_addr, uint8_t * data,
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{
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if (bytes == 0) { return false; }
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slave->reg_addr = reg_addr;
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if (slave->cfg.reg_size)
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if ((slave->cfg.reg_size) && (reg_addr != slave->reg_addr)) // Don't send address if reading next
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{
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slave->reg_addr = reg_addr;
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if (I2C_start() == false) { return false; }
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if (I2C_sndAddr(slave, I2C_WRITE) == false) { return false; }
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if (slave->cfg.reg_size >= I2C_16B_REG) // if size >2, 16bit address is used
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@ -1,5 +1,5 @@
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name=cI2C
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version=1.1
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version=1.2
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author=SMFSW <xgarmanboziax@gmail.com>
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maintainer=SMFSW <xgarmanboziax@gmail.com>
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sentence=Arduino Hardware I2C for AVR (in plain c)
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22
src/ci2c.c
22
src/ci2c.c
@ -1,18 +1,14 @@
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/*!\file ci2c.c
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** \author SMFSW
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** \version 1.1
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** \version 1.2
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** \copyright MIT SMFSW (2017)
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** \brief arduino master i2c in plain c code
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** \warning Don't access (r/w) last 16b internal address byte alone right after init, this would lead to hazardous result (in such case, make a dummy read of addr 0 before)
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**/
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// TODO: add interrupt vector / callback for it operations (if not too messy)
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// TODO: consider interrupts at least for RX when slave (and TX when master)
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// TODO: change contigous r/w operations so it doesn't send internal address again
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// TODO: split functions & headers
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#include "ci2c.h"
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#define START 0x08
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@ -69,7 +65,7 @@ void I2C_slave_init(I2C_SLAVE * slave, const uint8_t sl_addr, const I2C_INT_SIZE
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(void) I2C_slave_set_reg_size(slave, reg_sz);
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I2C_slave_set_rw_func(slave, (ci2c_fct_ptr) I2C_wr, I2C_WRITE);
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I2C_slave_set_rw_func(slave, (ci2c_fct_ptr) I2C_rd, I2C_READ);
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slave->reg_addr = 0;
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slave->reg_addr = (uint16_t) -1; // To be sure to send address on first access (warning: unless last 16b byte address is accessed alone)
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slave->status = I2C_OK;
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}
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@ -393,12 +389,12 @@ static bool I2C_wr(I2C_SLAVE * slave, const uint16_t reg_addr, uint8_t * data, c
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{
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if (bytes == 0) { return false; }
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(void) I2C_slave_set_reg_addr(slave, reg_addr);
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if (I2C_start() == false) { return false; }
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if (I2C_sndAddr(slave, I2C_WRITE) == false) { return false; }
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if (slave->cfg.reg_size)
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if ((slave->cfg.reg_size) && (reg_addr != slave->reg_addr)) // Don't send address if writing next
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{
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(void) I2C_slave_set_reg_addr(slave, reg_addr);
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if (slave->cfg.reg_size >= I2C_16B_REG) // if size >2, 16bit address is used
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{
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if (I2C_wr8((uint8_t) (reg_addr >> 8)) == false) { return false; }
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@ -429,10 +425,10 @@ static bool I2C_rd(I2C_SLAVE * slave, const uint16_t reg_addr, uint8_t * data, c
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{
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if (bytes == 0) { return false; }
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(void) I2C_slave_set_reg_addr(slave, reg_addr);
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if (slave->cfg.reg_size) // If start register has to be sent first
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if ((slave->cfg.reg_size) && (reg_addr != slave->reg_addr)) // Don't send address if reading next
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{
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(void) I2C_slave_set_reg_addr(slave, reg_addr);
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if (I2C_start() == false) { return false; }
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if (I2C_sndAddr(slave, I2C_WRITE) == false) { return false; }
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if (slave->cfg.reg_size >= I2C_16B_REG) // if size >2, 16bit address is used
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@ -1,8 +1,9 @@
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/*!\file ci2c.h
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** \author SMFSW
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** \version 1.1
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** \version 1.2
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** \copyright MIT SMFSW (2017)
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** \brief arduino i2c in plain c declarations
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** \warning Don't access (r/w) last 16b internal address byte alone right after init, this would lead to hazardous result (in such case, make a dummy read of addr 0 before)
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**/
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/****************************************************************/
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#ifndef __CI2C_H__
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@ -212,7 +213,6 @@ I2C_STATUS I2C_write(I2C_SLAVE * slave, const uint16_t reg_addr, uint8_t * data,
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** \return I2C_STATUS status of write attempt
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**/
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inline I2C_STATUS __attribute__((__always_inline__)) I2C_write_next(I2C_SLAVE * slave, uint8_t * data, const uint16_t bytes) {
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// TODO: implement read next so that it doesn't have to send start register address again
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return I2C_write(slave, slave->reg_addr, data, bytes); }
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/*!\brief This function reads data from the address specified and stores this
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@ -233,7 +233,6 @@ I2C_STATUS I2C_read(I2C_SLAVE * slave, const uint16_t reg_addr, uint8_t * data,
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** \return I2C_STATUS status of read attempt
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**/
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inline I2C_STATUS __attribute__((__always_inline__)) I2C_read_next(I2C_SLAVE * slave, uint8_t * data, const uint16_t bytes) {
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// TODO: implement read next so that it doesn't have to send start register address again
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return I2C_read(slave, slave->reg_addr, data, bytes); }
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