I am working with the nRF DK trying to read a sensor over I2C. I wrote some code in Keil uVision and I finally could read the sensor. However, for some weird reason I can't figure out, recently the twi_sw_master.c file gives some compilation errors.
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
This is the library:
/* 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" */
I am getting crazy with this. I already have my nRF51 DK reading the sensor, and now this same project just doesn't compile, neither does any other project I create with that library.
Can anyone help with this?
I even instaled again all the stuff in a different computer and it didn't work either.
Thank you.
[EDIT]
Also, it doesn't show a signal in the code pointing an error:
![enter image description here][1]
[1]: https://i.sstatic.net/NkIT8.png