nRF51 DK con Keil uVision. Error de compilación de la biblioteca I2C

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Estoy trabajando con el nRF DK tratando de leer un sensor sobre I2C. Escribí un código en Keil uVision y finalmente pude leer el sensor. Sin embargo, por alguna extraña razón no puedo entender, recientemente el archivo twi_sw_master.c produce algunos errores de compilación. 

compiling twi_sw_master.c...
RTE\nRF_Drivers\nRF51422_xxAB\twi_sw_master.c(136): error:  #254: type name is not allowed
          for (uint_fast8_t i=18; i--;)
RTE\nRF_Drivers\nRF51422_xxAB\twi_sw_master.c(136): error:  #65: expected a ";"
          for (uint_fast8_t i=18; i--;)
RTE\nRF_Drivers\nRF51422_xxAB\twi_sw_master.c(136): error:  #20: identifier "i" is undefined
          for (uint_fast8_t i=18; i--;)
RTE\nRF_Drivers\nRF51422_xxAB\twi_sw_master.c(311): error:  #254: type name is not allowed
      for (uint_fast8_t i = 0x80; i != 0; i>>=1)
RTE\nRF_Drivers\nRF51422_xxAB\twi_sw_master.c(311): error:  #65: expected a ";"
      for (uint_fast8_t i = 0x80; i != 0; i>>=1)
RTE\nRF_Drivers\nRF51422_xxAB\twi_sw_master.c(311): error:  #20: identifier "i" is undefined
      for (uint_fast8_t i = 0x80; i != 0; i>>=1)
RTE\nRF_Drivers\nRF51422_xxAB\twi_sw_master.c(384): error:  #254: type name is not allowed
      for (uint_fast8_t i = 0x80; i != 0; i>>=1)
RTE\nRF_Drivers\nRF51422_xxAB\twi_sw_master.c(384): error:  #65: expected a ";"
      for (uint_fast8_t i = 0x80; i != 0; i>>=1)
RTE\nRF_Drivers\nRF51422_xxAB\twi_sw_master.c(384): error:  #20: identifier "i" is undefined
      for (uint_fast8_t i = 0x80; i != 0; i>>=1)
RTE\nRF_Drivers\nRF51422_xxAB\twi_sw_master.c(474): warning:  #1-D: last line of file ends without a newline
  /*lint --flb "Leave library region" */
RTE\nRF_Drivers\nRF51422_xxAB\twi_sw_master.c: 1 warning, 9 errors
".\Objects\mag3110.axf" - 9 Error(s), 1 Warning(s).
Target not created.
Build Time Elapsed:  00:00:01

Esta es la biblioteca: 

/* Copyright (c) 2009 Nordic Semiconductor. All Rights Reserved.
 *
 * The information contained herein is property of Nordic Semiconductor ASA.
 * Terms and conditions of usage are described in detail in NORDIC
 * SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
 *
 * Licensees are granted free, non-transferable use of the information. NO
 * WARRANTY of ANY KIND is provided. This heading must NOT be removed from
 * the file.
 *
 */

#include <stdbool.h>
#include <stdint.h>
#include "twi_master.h"
#include "nrf_delay.h"

#include "twi_master_config.h"

/*lint -e415 -e845 -save "Out of bounds access" */
#define TWI_SDA_STANDARD0_NODRIVE1() do { \
        NRF_GPIO->PIN_CNF[TWI_MASTER_CONFIG_DATA_PIN_NUMBER] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos) \
        |(GPIO_PIN_CNF_DRIVE_S0D1 << GPIO_PIN_CNF_DRIVE_Pos)    \
        |(GPIO_PIN_CNF_PULL_Pullup << GPIO_PIN_CNF_PULL_Pos)  \
        |(GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) \
        |(GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos);  \
} while (0) /*!< Configures SDA pin to Standard-0, No-drive 1 */


#define TWI_SCL_STANDARD0_NODRIVE1() do { \
        NRF_GPIO->PIN_CNF[TWI_MASTER_CONFIG_CLOCK_PIN_NUMBER] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos) \
        |(GPIO_PIN_CNF_DRIVE_S0D1 << GPIO_PIN_CNF_DRIVE_Pos)    \
        |(GPIO_PIN_CNF_PULL_Pullup << GPIO_PIN_CNF_PULL_Pos)  \
        |(GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) \
        |(GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos);  \
} while (0) /*!< Configures SCL pin to Standard-0, No-drive 1 */


/*lint -restore */

#ifndef TWI_MASTER_TIMEOUT_COUNTER_LOAD_VALUE
#define TWI_MASTER_TIMEOUT_COUNTER_LOAD_VALUE (0UL) //!< Unit is number of empty loops. Timeout for SMBus devices is 35 ms. Set to zero to disable slave timeout altogether.
#endif

static bool twi_master_clear_bus(void);
static bool twi_master_issue_startcondition(void);
static bool twi_master_issue_stopcondition(void);
static bool twi_master_clock_byte(uint_fast8_t databyte);
static bool twi_master_clock_byte_in(uint8_t * databyte, bool ack);
static bool twi_master_wait_while_scl_low(void);

bool twi_master_init(void)
{
    // Configure both pins to output Standard 0, No-drive (open-drain) 1
    TWI_SDA_STANDARD0_NODRIVE1(); /*lint !e416 "Creation of out of bounds pointer" */
    TWI_SCL_STANDARD0_NODRIVE1(); /*lint !e416 "Creation of out of bounds pointer" */

    // Configure SCL as output
    TWI_SCL_HIGH();
    TWI_SCL_OUTPUT();

    // Configure SDA as output
    TWI_SDA_HIGH();
    TWI_SDA_OUTPUT();

    return twi_master_clear_bus();
}

bool twi_master_transfer(uint8_t address, uint8_t * data, uint8_t data_length, bool issue_stop_condition)
{
    bool transfer_succeeded = true;

    transfer_succeeded &= twi_master_issue_startcondition();
    transfer_succeeded &= twi_master_clock_byte(address);

    if (address & TWI_READ_BIT)
    {
        /* Transfer direction is from Slave to Master */
        while (data_length-- && transfer_succeeded)
        {
            // To indicate to slave that we've finished transferring last data byte
            // we need to NACK the last transfer.
            if (data_length == 0)
            {
                transfer_succeeded &= twi_master_clock_byte_in(data, (bool)false);
            }
            else
            {
                transfer_succeeded &= twi_master_clock_byte_in(data, (bool)true);
            }
            data++;
        }
    }
    else
    {
        /* Transfer direction is from Master to Slave */
        while (data_length-- && transfer_succeeded)
        {
            transfer_succeeded &= twi_master_clock_byte(*data);
            data++;
        }
    }

    if (issue_stop_condition || !transfer_succeeded)
    {
        transfer_succeeded &= twi_master_issue_stopcondition();
    }

    return transfer_succeeded;
}

/**
 * @brief Function for detecting stuck slaves and tries to clear the bus.
 *
 * @return
 * @retval false Bus is stuck.
 * @retval true Bus is clear.
 */
static bool twi_master_clear_bus(void)
{
    bool bus_clear;

    TWI_SDA_HIGH();
    TWI_SCL_HIGH();
    TWI_DELAY();


    if (TWI_SDA_READ() == 1 && TWI_SCL_READ() == 1)
    {
        bus_clear = true;
    }
    else if (TWI_SCL_READ() == 1)
    {
        bus_clear = false;
        // Clock max 18 pulses worst case scenario(9 for master to send the rest of command and 9 for slave to respond) to SCL line and wait for SDA come high
        for (uint_fast8_t i = 18; i--;)
        {
            TWI_SCL_LOW();
            TWI_DELAY();
            TWI_SCL_HIGH();
            TWI_DELAY();

            if (TWI_SDA_READ() == 1)
            {
                bus_clear = true;
                break;
            }
        }
    }
    else
    {
        bus_clear = false;
    }

    return bus_clear;
}

/**
 * @brief Function for issuing TWI START condition to the bus.
 *
 * START condition is signaled by pulling SDA low while SCL is high. After this function SCL and SDA will be low.
 *
 * @return
 * @retval false Timeout detected
 * @retval true Clocking succeeded
 */
static bool twi_master_issue_startcondition(void)
{
#if 0
    if (TWI_SCL_READ() == 1 && TWI_SDA_READ() == 1)
    {
        // Pull SDA low
        TWI_SDA_LOW();
    }
    else if (TWI_SCL_READ() == 1 && TWI_SDA_READ() == 0)
    {
        // Issue Stop by pulling SDA high
        TWI_SDA_HIGH();
        TWI_DELAY();

        // Then Start by pulling SDA low
        TWI_SDA_LOW();
    }
    else if (TWI_SCL_READ() == 0 && TWI_SDA_READ() == 0)
    {
        // First pull SDA high
        TWI_SDA_HIGH();

        // Then SCL high
        if (!twi_master_wait_while_scl_low())
        {
            return false;
        }

        // Then SDA low
        TWI_SDA_LOW();
    }
    else if (TWI_SCL_READ() == 0 && TWI_SDA_READ() == 1)
    {
        // SCL high
        if (!twi_master_wait_while_scl_low())
        {
            return false;
        }

        // Then SDA low
        TWI_SDA_LOW();
    }

    TWI_DELAY();
    TWI_SCL_LOW();
#endif

    // Make sure both SDA and SCL are high before pulling SDA low.
    TWI_SDA_HIGH();
    TWI_DELAY();
    if (!twi_master_wait_while_scl_low())
    {
        return false;
    }

    TWI_SDA_LOW();
    TWI_DELAY();

    // Other module function expect SCL to be low
    TWI_SCL_LOW();
    TWI_DELAY();

    return true;
}

/**
 * @brief Function for issuing TWI STOP condition to the bus.
 *
 * STOP condition is signaled by pulling SDA high while SCL is high. After this function SDA and SCL will be high.
 *
 * @return
 * @retval false Timeout detected
 * @retval true Clocking succeeded
 */
static bool twi_master_issue_stopcondition(void)
{
#if 0
    if (TWI_SCL_READ() == 1 && TWI_SDA_READ() == 1)
    {
        // Issue start, then issue stop

        // Pull SDA low to issue START
        TWI_SDA_LOW();
        TWI_DELAY();

        // Pull SDA high while SCL is high to issue STOP
        TWI_SDA_HIGH();
    }
    else if (TWI_SCL_READ() == 1 && TWI_SDA_READ() == 0)
    {
        // Pull SDA high while SCL is high to issue STOP
        TWI_SDA_HIGH();
    }
    else if (TWI_SCL_READ() == 0 && TWI_SDA_READ() == 0)
    {
        if (!twi_master_wait_while_scl_low())
        {
            return false;
        }

        // Pull SDA high while SCL is high to issue STOP
        TWI_SDA_HIGH();
    }
    else if (TWI_SCL_READ() == 0 && TWI_SDA_READ() == 1)
    {
        TWI_SDA_LOW();
        TWI_DELAY();

        // SCL high
        if (!twi_master_wait_while_scl_low())
        {
            return false;
        }

        // Pull SDA high while SCL is high to issue STOP
        TWI_SDA_HIGH();
    }

    TWI_DELAY();
#endif

    TWI_SDA_LOW();
    TWI_DELAY();
    if (!twi_master_wait_while_scl_low())
    {
        return false;
    }

    TWI_SDA_HIGH();
    TWI_DELAY();

    return true;
}

/**
 * @brief Function for clocking one data byte out and reads slave acknowledgment.
 *
 * Can handle clock stretching.
 * After calling this function SCL is low and SDA low/high depending on the
 * value of LSB of the data byte.
 * SCL is expected to be output and low when entering this function.
 *
 * @param databyte Data byte to clock out.
 * @return
 * @retval true Slave acknowledged byte.
 * @retval false Timeout or slave didn't acknowledge byte.
 */
static bool twi_master_clock_byte(uint_fast8_t databyte)
{
    bool transfer_succeeded = true;

    /** @snippet [TWI SW master write] */
    // Make sure SDA is an output
    TWI_SDA_OUTPUT();

    // MSB first
    for (uint_fast8_t i = 0x80; i != 0; i >>= 1)
    {
        TWI_SCL_LOW();
        TWI_DELAY();

        if (databyte & i)
        {
            TWI_SDA_HIGH();
        }
        else
        {
            TWI_SDA_LOW();
        }

        if (!twi_master_wait_while_scl_low())
        {
            transfer_succeeded = false; // Timeout
            break;
        }
    }

    // Finish last data bit by pulling SCL low
    TWI_SCL_LOW();
    TWI_DELAY();

    /** @snippet [TWI SW master write] */

    // Configure TWI_SDA pin as input for receiving the ACK bit
    TWI_SDA_INPUT();

    // Give some time for the slave to load the ACK bit on the line
    TWI_DELAY();

    // Pull SCL high and wait a moment for SDA line to settle
    // Make sure slave is not stretching the clock
    transfer_succeeded &= twi_master_wait_while_scl_low();

    // Read ACK/NACK. NACK == 1, ACK == 0
    transfer_succeeded &= !(TWI_SDA_READ());

    // Finish ACK/NACK bit clock cycle and give slave a moment to release control
    // of the SDA line
    TWI_SCL_LOW();
    TWI_DELAY();

    // Configure TWI_SDA pin as output as other module functions expect that
    TWI_SDA_OUTPUT();

    return transfer_succeeded;
}


/**
 * @brief Function for clocking one data byte in and sends ACK/NACK bit.
 *
 * Can handle clock stretching.
 * SCL is expected to be output and low when entering this function.
 * After calling this function, SCL is high and SDA low/high depending if ACK/NACK was sent.
 *
 * @param databyte Data byte to clock out.
 * @param ack If true, send ACK. Otherwise send NACK.
 * @return
 * @retval true Byte read succesfully
 * @retval false Timeout detected
 */
static bool twi_master_clock_byte_in(uint8_t *databyte, bool ack)
{
    uint_fast8_t byte_read          = 0;
    bool         transfer_succeeded = true;

    /** @snippet [TWI SW master read] */
    // Make sure SDA is an input
    TWI_SDA_INPUT();

    // SCL state is guaranteed to be high here

    // MSB first
    for (uint_fast8_t i = 0x80; i != 0; i >>= 1)
    {
        if (!twi_master_wait_while_scl_low())
        {
            transfer_succeeded = false;
            break;
        }

        if (TWI_SDA_READ())
        {
            byte_read |= i;
        }
        else
        {
            // No need to do anything
        }

        TWI_SCL_LOW();
        TWI_DELAY();
    }

    // Make sure SDA is an output before we exit the function
    TWI_SDA_OUTPUT();
    /** @snippet [TWI SW master read] */

    *databyte = (uint8_t)byte_read;

    // Send ACK bit

    // SDA high == NACK, SDA low == ACK
    if (ack)
    {
        TWI_SDA_LOW();
    }
    else
    {
        TWI_SDA_HIGH();
    }

    // Let SDA line settle for a moment
    TWI_DELAY();

    // Drive SCL high to start ACK/NACK bit transfer
    // Wait until SCL is high, or timeout occurs
    if (!twi_master_wait_while_scl_low())
    {
        transfer_succeeded = false; // Timeout
    }

    // Finish ACK/NACK bit clock cycle and give slave a moment to react
    TWI_SCL_LOW();
    TWI_DELAY();

    return transfer_succeeded;
}


/**
 * @brief Function for pulling SCL high and waits until it is high or timeout occurs.
 *
 * SCL is expected to be output before entering this function.
 * @note If TWI_MASTER_TIMEOUT_COUNTER_LOAD_VALUE is set to zero, timeout functionality is not compiled in.
 * @return
 * @retval true SCL is now high.
 * @retval false Timeout occurred and SCL is still low.
 */
static bool twi_master_wait_while_scl_low(void)
{
#if TWI_MASTER_TIMEOUT_COUNTER_LOAD_VALUE != 0
    uint32_t volatile timeout_counter = TWI_MASTER_TIMEOUT_COUNTER_LOAD_VALUE;
#endif

    // Pull SCL high just in case if something left it low
    TWI_SCL_HIGH();
    TWI_DELAY();

    while (TWI_SCL_READ() == 0)
    {
        // If SCL is low, one of the slaves is busy and we must wait

#if TWI_MASTER_TIMEOUT_COUNTER_LOAD_VALUE != 0
        if (timeout_counter-- == 0)
        {
            // If timeout_detected, return false
            return false;
        }
#endif
    }

    return true;
}

/*lint --flb "Leave library region" */

Me estoy volviendo loca con esto. Ya tengo mi nRF51 DK leyendo el sensor, y ahora este mismo proyecto simplemente no se compila, ni ningún otro proyecto que cree con esa biblioteca.

¿Alguien puede ayudar con esto?

Incluso instalé de nuevo todas las cosas en una computadora diferente y tampoco funcionó.

Gracias.

[EDITAR]

Además, no muestra una señal en el código que señala un error:

    
pregunta zapeitor

1 respuesta

2

Parece que tu compilador de C no es compatible con C99 fuera de la caja.

  • Así que intenta activar C99. En cuanto a GCC, debe agregar -std=c99 a los argumentos de la línea de comando. En cuanto a Keil, intente --c99 . Como alternativa, en Keil uVision, puede activar esto haciendo clic en la casilla de verificación "Modo C99" en la pestaña "C / C ++" en las opciones del proyecto (Zapeitor ha señalado esto en un comentario).

  • De lo contrario, vuelva a escribir el código: en su caso, la declaración de la variable dentro de la declaración for no es válida. Tienes que moverlo hacia arriba; debe aparecer justo después de la declaración de la función: 

void f() {
  int i;

  [...]

  for (i = 0; i < 5; i++) {
  }
}

en lugar de 

void f() {
  [...]

  for (int i = 0; i < 5; i++) {
  }
}

Lo último solo es posible con C99.

    
respondido por el Beryllium

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