GPIO library importance in I2C and its functions explanations?Msp430 i²c module and librariesConfiguring STM32 output ports for I2CTaking output from an Adafruit I2C 16 channel driverHow to initialize I2C on STM32F0?Not getting correct values in I2C interfacing in AtmegaI2C-dev: Change write and read parametersAnyone ever split I2C across two microcontrollers?BT HC-06 not receiving data from 8051How To Measure I2C Setup Time?Capacitance measurement, mpr121

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GPIO library importance in I2C and its functions explanations?


Msp430 i²c module and librariesConfiguring STM32 output ports for I2CTaking output from an Adafruit I2C 16 channel driverHow to initialize I2C on STM32F0?Not getting correct values in I2C interfacing in AtmegaI2C-dev: Change write and read parametersAnyone ever split I2C across two microcontrollers?BT HC-06 not receiving data from 8051How To Measure I2C Setup Time?Capacitance measurement, mpr121






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-1















I've been assigned in a project where I have to communicate mpr121 capacitive touch sensing keyboard with 8051 microcontroller with I2C using Easy8051a board.
I have pretty much learned the theoretical part of I2C communications but struggling with the implementations I've come across a GitHub project where they use GPIO library with some functions very hard to understand.
My question is why do we need GPIO to implement an I2C communication rather doing in the standard way, can we use GPIO with all microcontrollers like the 8051 and I want to know the meaning of the functions below.
If anyone could give me a push on this, I'd be very grateful. Thank you!



Here are the GPIO functions..



void Init_I2C_GPIO(void)

GPIO_DIS_OUTPUT(SCL);
PIN_PULLUP_EN(GPIO_PIN_REG(SCL));
GPIO_DIS_OUTPUT(SDA);
PIN_PULLUP_EN(GPIO_PIN_REG(SDA));



void SCL_0()

GPIO_OUTPUT_SET(SCL, 0);
PIN_PULLUP_DIS(GPIO_PIN_REG(SCL));



void SCL_1()

GPIO_OUTPUT_SET(SCL, 1);
PIN_PULLUP_EN(GPIO_PIN_REG(SCL));



void SDA_0()

GPIO_OUTPUT_SET(SDA, 0);
PIN_PULLUP_DIS(GPIO_PIN_REG(SDA));



void SDA_1()

GPIO_OUTPUT_SET(SDA, 1);
PIN_PULLUP_EN(GPIO_PIN_REG(SDA));



unsigned char SDA_R()

return GPIO_INPUT_GET(SDA);



I have a clue with middle 4 but at 5th SDA_R() and first Init_I2C_GPIO() not quite understandable.



Why not go the standard way like this:



void I2CInit()

SDA = 1;
SCL = 1;


void I2CStart()

SDA = 0;
SCL = 0;


void I2CRestart()

SDA = 1;
SCL = 1;
SDA = 0;
SCL = 0;


void I2CStop()

SCL = 0;
SDA = 0;
SCL = 1;
SDA = 1;



How can i translate SDA_R() to the standard way shown above?






microcontroller i2c 8051







share|improve this question






















  • what do you mean by "the standard way"?

    – old_timer
    Mar 9 at 4:09











  • Your "standard way" implies a pointer of some sort. That "standard way" is a bit risky in general, but assuming it works for you and that version of that compiler, then go for it. Using abstraction allows for much more flexibility and you can turn an abstraction like that into a volatile pointer scheme using macros but cant turn volatile pointer schemes into abstraction layers.

    – old_timer
    Mar 9 at 4:17











  • to bit bang i2c or other bi-directional data busses you will need to either open drain or switch the gpio to be push-pull or input/tristate at the right times so the slave can control the data line. that can be done with a volatile pointer scheme (assuming you have that working correctly with this version of this compiler) or abstraction layer solutions. so your "standard way" needs code to do the writes and reads and depending on how you implement that might need more code in the functions you have created to control the direction.

    – old_timer
    Mar 9 at 4:20











  • Using abstraction layer functions will benefit you in the long run. But there are platforms that are so resource/performance starved and/or have instruction set features where you really want to gamble on the volatile pointer thing. But if/when you get into working against simulations or writing code that the one module/function/library can be used both in baremetal and a kernel driver and an application wont work so well with the volatile pointer solution but is trivial with the abstraction layer/function approach.

    – old_timer
    Mar 9 at 4:25

















-1















I've been assigned in a project where I have to communicate mpr121 capacitive touch sensing keyboard with 8051 microcontroller with I2C using Easy8051a board.
I have pretty much learned the theoretical part of I2C communications but struggling with the implementations I've come across a GitHub project where they use GPIO library with some functions very hard to understand.
My question is why do we need GPIO to implement an I2C communication rather doing in the standard way, can we use GPIO with all microcontrollers like the 8051 and I want to know the meaning of the functions below.
If anyone could give me a push on this, I'd be very grateful. Thank you!



Here are the GPIO functions..



void Init_I2C_GPIO(void)

GPIO_DIS_OUTPUT(SCL);
PIN_PULLUP_EN(GPIO_PIN_REG(SCL));
GPIO_DIS_OUTPUT(SDA);
PIN_PULLUP_EN(GPIO_PIN_REG(SDA));



void SCL_0()

GPIO_OUTPUT_SET(SCL, 0);
PIN_PULLUP_DIS(GPIO_PIN_REG(SCL));



void SCL_1()

GPIO_OUTPUT_SET(SCL, 1);
PIN_PULLUP_EN(GPIO_PIN_REG(SCL));



void SDA_0()

GPIO_OUTPUT_SET(SDA, 0);
PIN_PULLUP_DIS(GPIO_PIN_REG(SDA));



void SDA_1()

GPIO_OUTPUT_SET(SDA, 1);
PIN_PULLUP_EN(GPIO_PIN_REG(SDA));



unsigned char SDA_R()

return GPIO_INPUT_GET(SDA);



I have a clue with middle 4 but at 5th SDA_R() and first Init_I2C_GPIO() not quite understandable.



Why not go the standard way like this:



void I2CInit()

SDA = 1;
SCL = 1;


void I2CStart()

SDA = 0;
SCL = 0;


void I2CRestart()

SDA = 1;
SCL = 1;
SDA = 0;
SCL = 0;


void I2CStop()

SCL = 0;
SDA = 0;
SCL = 1;
SDA = 1;



How can i translate SDA_R() to the standard way shown above?






microcontroller i2c 8051







share|improve this question






















  • what do you mean by "the standard way"?

    – old_timer
    Mar 9 at 4:09











  • Your "standard way" implies a pointer of some sort. That "standard way" is a bit risky in general, but assuming it works for you and that version of that compiler, then go for it. Using abstraction allows for much more flexibility and you can turn an abstraction like that into a volatile pointer scheme using macros but cant turn volatile pointer schemes into abstraction layers.

    – old_timer
    Mar 9 at 4:17











  • to bit bang i2c or other bi-directional data busses you will need to either open drain or switch the gpio to be push-pull or input/tristate at the right times so the slave can control the data line. that can be done with a volatile pointer scheme (assuming you have that working correctly with this version of this compiler) or abstraction layer solutions. so your "standard way" needs code to do the writes and reads and depending on how you implement that might need more code in the functions you have created to control the direction.

    – old_timer
    Mar 9 at 4:20











  • Using abstraction layer functions will benefit you in the long run. But there are platforms that are so resource/performance starved and/or have instruction set features where you really want to gamble on the volatile pointer thing. But if/when you get into working against simulations or writing code that the one module/function/library can be used both in baremetal and a kernel driver and an application wont work so well with the volatile pointer solution but is trivial with the abstraction layer/function approach.

    – old_timer
    Mar 9 at 4:25













-1












-1








-1








I've been assigned in a project where I have to communicate mpr121 capacitive touch sensing keyboard with 8051 microcontroller with I2C using Easy8051a board.
I have pretty much learned the theoretical part of I2C communications but struggling with the implementations I've come across a GitHub project where they use GPIO library with some functions very hard to understand.
My question is why do we need GPIO to implement an I2C communication rather doing in the standard way, can we use GPIO with all microcontrollers like the 8051 and I want to know the meaning of the functions below.
If anyone could give me a push on this, I'd be very grateful. Thank you!



Here are the GPIO functions..



void Init_I2C_GPIO(void)

GPIO_DIS_OUTPUT(SCL);
PIN_PULLUP_EN(GPIO_PIN_REG(SCL));
GPIO_DIS_OUTPUT(SDA);
PIN_PULLUP_EN(GPIO_PIN_REG(SDA));



void SCL_0()

GPIO_OUTPUT_SET(SCL, 0);
PIN_PULLUP_DIS(GPIO_PIN_REG(SCL));



void SCL_1()

GPIO_OUTPUT_SET(SCL, 1);
PIN_PULLUP_EN(GPIO_PIN_REG(SCL));



void SDA_0()

GPIO_OUTPUT_SET(SDA, 0);
PIN_PULLUP_DIS(GPIO_PIN_REG(SDA));



void SDA_1()

GPIO_OUTPUT_SET(SDA, 1);
PIN_PULLUP_EN(GPIO_PIN_REG(SDA));



unsigned char SDA_R()

return GPIO_INPUT_GET(SDA);



I have a clue with middle 4 but at 5th SDA_R() and first Init_I2C_GPIO() not quite understandable.



Why not go the standard way like this:



void I2CInit()

SDA = 1;
SCL = 1;


void I2CStart()

SDA = 0;
SCL = 0;


void I2CRestart()

SDA = 1;
SCL = 1;
SDA = 0;
SCL = 0;


void I2CStop()

SCL = 0;
SDA = 0;
SCL = 1;
SDA = 1;



How can i translate SDA_R() to the standard way shown above?






microcontroller i2c 8051







share|improve this question














I've been assigned in a project where I have to communicate mpr121 capacitive touch sensing keyboard with 8051 microcontroller with I2C using Easy8051a board.
I have pretty much learned the theoretical part of I2C communications but struggling with the implementations I've come across a GitHub project where they use GPIO library with some functions very hard to understand.
My question is why do we need GPIO to implement an I2C communication rather doing in the standard way, can we use GPIO with all microcontrollers like the 8051 and I want to know the meaning of the functions below.
If anyone could give me a push on this, I'd be very grateful. Thank you!



Here are the GPIO functions..



void Init_I2C_GPIO(void)

GPIO_DIS_OUTPUT(SCL);
PIN_PULLUP_EN(GPIO_PIN_REG(SCL));
GPIO_DIS_OUTPUT(SDA);
PIN_PULLUP_EN(GPIO_PIN_REG(SDA));



void SCL_0()

GPIO_OUTPUT_SET(SCL, 0);
PIN_PULLUP_DIS(GPIO_PIN_REG(SCL));



void SCL_1()

GPIO_OUTPUT_SET(SCL, 1);
PIN_PULLUP_EN(GPIO_PIN_REG(SCL));



void SDA_0()

GPIO_OUTPUT_SET(SDA, 0);
PIN_PULLUP_DIS(GPIO_PIN_REG(SDA));



void SDA_1()

GPIO_OUTPUT_SET(SDA, 1);
PIN_PULLUP_EN(GPIO_PIN_REG(SDA));



unsigned char SDA_R()

return GPIO_INPUT_GET(SDA);



I have a clue with middle 4 but at 5th SDA_R() and first Init_I2C_GPIO() not quite understandable.



Why not go the standard way like this:



void I2CInit()

SDA = 1;
SCL = 1;


void I2CStart()

SDA = 0;
SCL = 0;


void I2CRestart()

SDA = 1;
SCL = 1;
SDA = 0;
SCL = 0;


void I2CStop()

SCL = 0;
SDA = 0;
SCL = 1;
SDA = 1;



How can i translate SDA_R() to the standard way shown above?






microcontroller i2c 8051




microcontroller i2c 8051






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Mar 8 at 23:41









Çlirim MuratiÇlirim Murati

197




197












  • what do you mean by "the standard way"?

    – old_timer
    Mar 9 at 4:09











  • Your "standard way" implies a pointer of some sort. That "standard way" is a bit risky in general, but assuming it works for you and that version of that compiler, then go for it. Using abstraction allows for much more flexibility and you can turn an abstraction like that into a volatile pointer scheme using macros but cant turn volatile pointer schemes into abstraction layers.

    – old_timer
    Mar 9 at 4:17











  • to bit bang i2c or other bi-directional data busses you will need to either open drain or switch the gpio to be push-pull or input/tristate at the right times so the slave can control the data line. that can be done with a volatile pointer scheme (assuming you have that working correctly with this version of this compiler) or abstraction layer solutions. so your "standard way" needs code to do the writes and reads and depending on how you implement that might need more code in the functions you have created to control the direction.

    – old_timer
    Mar 9 at 4:20











  • Using abstraction layer functions will benefit you in the long run. But there are platforms that are so resource/performance starved and/or have instruction set features where you really want to gamble on the volatile pointer thing. But if/when you get into working against simulations or writing code that the one module/function/library can be used both in baremetal and a kernel driver and an application wont work so well with the volatile pointer solution but is trivial with the abstraction layer/function approach.

    – old_timer
    Mar 9 at 4:25

















  • what do you mean by "the standard way"?

    – old_timer
    Mar 9 at 4:09











  • Your "standard way" implies a pointer of some sort. That "standard way" is a bit risky in general, but assuming it works for you and that version of that compiler, then go for it. Using abstraction allows for much more flexibility and you can turn an abstraction like that into a volatile pointer scheme using macros but cant turn volatile pointer schemes into abstraction layers.

    – old_timer
    Mar 9 at 4:17











  • to bit bang i2c or other bi-directional data busses you will need to either open drain or switch the gpio to be push-pull or input/tristate at the right times so the slave can control the data line. that can be done with a volatile pointer scheme (assuming you have that working correctly with this version of this compiler) or abstraction layer solutions. so your "standard way" needs code to do the writes and reads and depending on how you implement that might need more code in the functions you have created to control the direction.

    – old_timer
    Mar 9 at 4:20











  • Using abstraction layer functions will benefit you in the long run. But there are platforms that are so resource/performance starved and/or have instruction set features where you really want to gamble on the volatile pointer thing. But if/when you get into working against simulations or writing code that the one module/function/library can be used both in baremetal and a kernel driver and an application wont work so well with the volatile pointer solution but is trivial with the abstraction layer/function approach.

    – old_timer
    Mar 9 at 4:25
















what do you mean by "the standard way"?

– old_timer
Mar 9 at 4:09





what do you mean by "the standard way"?

– old_timer
Mar 9 at 4:09













Your "standard way" implies a pointer of some sort. That "standard way" is a bit risky in general, but assuming it works for you and that version of that compiler, then go for it. Using abstraction allows for much more flexibility and you can turn an abstraction like that into a volatile pointer scheme using macros but cant turn volatile pointer schemes into abstraction layers.

– old_timer
Mar 9 at 4:17





Your "standard way" implies a pointer of some sort. That "standard way" is a bit risky in general, but assuming it works for you and that version of that compiler, then go for it. Using abstraction allows for much more flexibility and you can turn an abstraction like that into a volatile pointer scheme using macros but cant turn volatile pointer schemes into abstraction layers.

– old_timer
Mar 9 at 4:17













to bit bang i2c or other bi-directional data busses you will need to either open drain or switch the gpio to be push-pull or input/tristate at the right times so the slave can control the data line. that can be done with a volatile pointer scheme (assuming you have that working correctly with this version of this compiler) or abstraction layer solutions. so your "standard way" needs code to do the writes and reads and depending on how you implement that might need more code in the functions you have created to control the direction.

– old_timer
Mar 9 at 4:20





to bit bang i2c or other bi-directional data busses you will need to either open drain or switch the gpio to be push-pull or input/tristate at the right times so the slave can control the data line. that can be done with a volatile pointer scheme (assuming you have that working correctly with this version of this compiler) or abstraction layer solutions. so your "standard way" needs code to do the writes and reads and depending on how you implement that might need more code in the functions you have created to control the direction.

– old_timer
Mar 9 at 4:20













Using abstraction layer functions will benefit you in the long run. But there are platforms that are so resource/performance starved and/or have instruction set features where you really want to gamble on the volatile pointer thing. But if/when you get into working against simulations or writing code that the one module/function/library can be used both in baremetal and a kernel driver and an application wont work so well with the volatile pointer solution but is trivial with the abstraction layer/function approach.

– old_timer
Mar 9 at 4:25





Using abstraction layer functions will benefit you in the long run. But there are platforms that are so resource/performance starved and/or have instruction set features where you really want to gamble on the volatile pointer thing. But if/when you get into working against simulations or writing code that the one module/function/library can be used both in baremetal and a kernel driver and an application wont work so well with the volatile pointer solution but is trivial with the abstraction layer/function approach.

– old_timer
Mar 9 at 4:25












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