Hi, Everyone
I use sdk15.2 & nrf52832
I am doing a test to read the slave address in TWI
There is one slave device on the board and the slave address is 0x68
I used three examples in twi_scanner, twi_sensor, twi_master_using_nrf_twi_mgnr
The slave addresses read from each program are read differently
< nRF5_SDK_15.2.0_9412b96\examples\peripheral\twi_scanner >
0> <info> app: TWI scanner started.
0> <info> app: TWI device detected at address 0x68.
< nRF5_SDK_15.2.0_9412b96\examples\peripheral\twi_sensor >
0> <info> app:
0> TWI sensor example started.
0> <info> app: TWI device detected at address 0x1.
0> <info> app: TWI device detected at address 0xE.
0> <info> app: TWI device detected at address 0x1C.
0> <info> app: TWI device detected at address 0x29.
0> <info> app: TWI device detected at address 0x36.
0> <info> app: TWI device detected at address 0x43.
0> <info> app: TWI device detected at address 0x50.
0> <info> app: TWI device detected at address 0x5D.
0> <info> app: TWI device detected at address 0x6A.
<nRF5_SDK_15.2.0_9412b96\examples\peripheral\twi_master_using_nrf_twi_mngr>
0>
0> TWI master example started.
0> <info> app: TWI device detected at address 0x1.
/**
* Copyright (c) 2015 - 2018, Nordic Semiconductor ASA
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form, except as embedded into a Nordic
* Semiconductor ASA integrated circuit in a product or a software update for
* such product, must reproduce the above copyright notice, this list of
* conditions and the following disclaimer in the documentation and/or other
* materials provided with the distribution.
*
* 3. Neither the name of Nordic Semiconductor ASA nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* 4. This software, with or without modification, must only be used with a
* Nordic Semiconductor ASA integrated circuit.
*
* 5. Any software provided in binary form under this license must not be reverse
* engineered, decompiled, modified and/or disassembled.
*
* THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
/** @file
* @defgroup nrf_twi_master_example main.c
* @{
* @ingroup nrf_twi_example
* @brief TWI Example Application main file.
*
* This file contains the source code for a sample application using TWI.
*/
#include <stdio.h>
#include "boards.h"
#include "app_util_platform.h"
#include "app_timer.h"
#include "nrf_pwr_mgmt.h"
#include "nrf_drv_clock.h"
#include "bsp.h"
#include "app_error.h"
#include "nrf_twi_mngr.h"
#include "lm75b.h"
#include "mma7660.h"
#include "compiler_abstraction.h"
#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"
#define TWI_INSTANCE_ID 0
#define MAX_PENDING_TRANSACTIONS 5
NRF_TWI_MNGR_DEF(m_nrf_twi_mngr, MAX_PENDING_TRANSACTIONS, TWI_INSTANCE_ID);
APP_TIMER_DEF(m_timer);
// Pin number for indicating communication with sensors.
#ifdef BSP_LED_3
#define READ_ALL_INDICATOR BSP_BOARD_LED_3
#else
#error "Please choose an output pin"
#endif
// Buffer for data read from sensors.
#define BUFFER_SIZE 11
static uint8_t m_buffer[BUFFER_SIZE];
// Data structures needed for averaging of data read from sensors.
// [max 32, otherwise "int16_t" won't be sufficient to hold the sum
// of temperature samples]
#define NUMBER_OF_SAMPLES 16
typedef struct
{
int16_t temp;
int16_t x;
int16_t y;
int16_t z;
} sum_t;
static sum_t m_sum = { 0, 0, 0, 0 };
typedef struct
{
// [use bit fields to fit whole structure into one 32-bit word]
int16_t temp : 11;
int8_t x : 6;
int8_t y : 6;
int8_t z : 6;
} sample_t;
static sample_t m_samples[NUMBER_OF_SAMPLES] = { { 0, 0, 0, 0 } };
static uint8_t m_sample_idx = 0;
// Value previously read from MMA7660's Tilt register - used to detect change
// in orientation, shake signaling etc.
static uint8_t m_prev_tilt = 0;
#if defined( __GNUC__ ) && (__LINT__ == 0)
// This is required if one wants to use floating-point values in 'printf'
// (by default this feature is not linked together with newlib-nano).
// Please note, however, that this adds about 13 kB code footprint...
__ASM(".global _printf_float");
#endif
////////////////////////////////////////////////////////////////////////////////
// Reading of data from sensors - current temperature from LM75B and from
// MMA7660: X, Y, Z and tilt status.
#if (BUFFER_SIZE < 6)
#error Buffer too small.
#endif
#define GET_ACC_VALUE(axis, reg_data) \
do { \
if (MMA7660_DATA_IS_VALID(reg_data)) \
{ \
axis = MMA7660_GET_ACC(reg_data); \
} \
} while (0)
void read_all_cb(ret_code_t result, void * p_user_data)
{
if (result != NRF_SUCCESS)
{
NRF_LOG_WARNING("read_all_cb - error: %d", (int)result);
return;
}
sample_t * p_sample = &m_samples[m_sample_idx];
m_sum.temp -= p_sample->temp;
m_sum.x -= p_sample->x;
m_sum.y -= p_sample->y;
m_sum.z -= p_sample->z;
uint8_t temp_hi = m_buffer[0];
uint8_t temp_lo = m_buffer[1];
uint8_t x_out = m_buffer[2];
uint8_t y_out = m_buffer[3];
uint8_t z_out = m_buffer[4];
uint8_t tilt = m_buffer[5];
p_sample->temp = LM75B_GET_TEMPERATURE_VALUE(temp_hi, temp_lo);
GET_ACC_VALUE(p_sample->x, x_out);
GET_ACC_VALUE(p_sample->y, y_out);
GET_ACC_VALUE(p_sample->z, z_out);
if (!MMA7660_DATA_IS_VALID(tilt))
{
tilt = m_prev_tilt;
}
m_sum.temp += p_sample->temp;
m_sum.x += p_sample->x;
m_sum.y += p_sample->y;
m_sum.z += p_sample->z;
++m_sample_idx;
if (m_sample_idx >= NUMBER_OF_SAMPLES)
{
m_sample_idx = 0;
}
// Show current average values every time sample index rolls over (for RTC
// ticking at 32 Hz and 16 samples it will be every 500 ms) or when tilt
// status changes.
if (m_sample_idx == 0 || (m_prev_tilt && m_prev_tilt != tilt))
{
char const * orientation;
switch (MMA7660_GET_ORIENTATION(tilt))
{
case MMA7660_ORIENTATION_LEFT: orientation = "LEFT"; break;
case MMA7660_ORIENTATION_RIGHT: orientation = "RIGHT"; break;
case MMA7660_ORIENTATION_DOWN: orientation = "DOWN"; break;
case MMA7660_ORIENTATION_UP: orientation = "UP"; break;
default: orientation = "?"; break;
}
NRF_LOG_RAW_INFO("Temp: " NRF_LOG_FLOAT_MARKER " | X: %3d, Y: %3d, Z: %3d ",
NRF_LOG_FLOAT((float)((m_sum.temp * 0.125) / NUMBER_OF_SAMPLES)),
m_sum.x / NUMBER_OF_SAMPLES,
m_sum.y / NUMBER_OF_SAMPLES,
m_sum.z / NUMBER_OF_SAMPLES);
NRF_LOG_RAW_INFO("| %s%s%s\r\n",
(uint32_t)orientation,
(uint32_t)(MMA7660_TAP_DETECTED(tilt) ? " TAP" : ""),
(uint32_t)(MMA7660_SHAKE_DETECTED(tilt) ? " SHAKE" : ""));
m_prev_tilt = tilt;
}
}
static void read_all(void)
{
// [these structures have to be "static" - they cannot be placed on stack
// since the transaction is scheduled and these structures most likely
// will be referred after this function returns]
static nrf_twi_mngr_transfer_t const transfers[] =
{
LM75B_READ_TEMP(&m_buffer[0])
,
MMA7660_READ_XYZ_AND_TILT(&m_buffer[2])
};
static nrf_twi_mngr_transaction_t NRF_TWI_MNGR_BUFFER_LOC_IND transaction =
{
.callback = read_all_cb,
.p_user_data = NULL,
.p_transfers = transfers,
.number_of_transfers = sizeof(transfers) / sizeof(transfers[0])
};
APP_ERROR_CHECK(nrf_twi_mngr_schedule(&m_nrf_twi_mngr, &transaction));
// Signal on LED that something is going on.
bsp_board_led_invert(READ_ALL_INDICATOR);
}
#if (BUFFER_SIZE < 7)
#error Buffer too small.
#endif
static void read_lm75b_registers_cb(ret_code_t result, void * p_user_data)
{
if (result != NRF_SUCCESS)
{
NRF_LOG_WARNING("read_lm75b_registers_cb - error: %d", (int)result);
return;
}
NRF_LOG_DEBUG("LM75B:");
NRF_LOG_HEXDUMP_DEBUG(m_buffer, 7);
}
static void read_lm75b_registers(void)
{
// [these structures have to be "static" - they cannot be placed on stack
// since the transaction is scheduled and these structures most likely
// will be referred after this function returns]
static nrf_twi_mngr_transfer_t const transfers[] =
{
LM75B_READ(&lm75b_conf_reg_addr, &m_buffer[0], 1),
LM75B_READ(&lm75b_temp_reg_addr, &m_buffer[1], 2),
LM75B_READ(&lm75b_tos_reg_addr, &m_buffer[3], 2),
LM75B_READ(&lm75b_thyst_reg_addr, &m_buffer[5], 2)
};
static nrf_twi_mngr_transaction_t NRF_TWI_MNGR_BUFFER_LOC_IND transaction =
{
.callback = read_lm75b_registers_cb,
.p_user_data = NULL,
.p_transfers = transfers,
.number_of_transfers = sizeof(transfers) / sizeof(transfers[0])
};
APP_ERROR_CHECK(nrf_twi_mngr_schedule(&m_nrf_twi_mngr, &transaction));
}
#if (BUFFER_SIZE < MMA7660_NUMBER_OF_REGISTERS)
#error Buffer too small.
#endif
static void read_mma7660_registers_cb(ret_code_t result, void * p_user_data)
{
if (result != NRF_SUCCESS)
{
NRF_LOG_WARNING("read_mma7660_registers_cb - error: %d", (int)result);
return;
}
NRF_LOG_DEBUG("MMA7660:");
NRF_LOG_HEXDUMP_DEBUG(m_buffer, MMA7660_NUMBER_OF_REGISTERS);
}
static void read_mma7660_registers(void)
{
// [these structures have to be "static" - they cannot be placed on stack
// since the transaction is scheduled and these structures most likely
// will be referred after this function returns]
static nrf_twi_mngr_transfer_t const transfers[] =
{
MMA7660_READ(&mma7660_xout_reg_addr,
m_buffer, MMA7660_NUMBER_OF_REGISTERS)
};
static nrf_twi_mngr_transaction_t NRF_TWI_MNGR_BUFFER_LOC_IND transaction =
{
.callback = read_mma7660_registers_cb,
.p_user_data = NULL,
.p_transfers = transfers,
.number_of_transfers = sizeof(transfers) / sizeof(transfers[0])
};
APP_ERROR_CHECK(nrf_twi_mngr_schedule(&m_nrf_twi_mngr, &transaction));
}
////////////////////////////////////////////////////////////////////////////////
// Buttons handling (by means of BSP).
//
static void bsp_event_handler(bsp_event_t event)
{
// Each time the button 1 or 4 is pushed we start a transaction reading
// values of all registers from LM75B or MMA7660 respectively.
switch (event)
{
case BSP_EVENT_KEY_0: // Button 1 pushed.
read_lm75b_registers();
break;
case BSP_EVENT_KEY_3: // Button 4 pushed.
read_mma7660_registers();
break;
default:
break;
}
}
static void bsp_config(void)
{
uint32_t err_code;
err_code = app_timer_init();
APP_ERROR_CHECK(err_code);
err_code = bsp_init(BSP_INIT_BUTTONS, bsp_event_handler);
APP_ERROR_CHECK(err_code);
}
// TWI (with transaction manager) initialization.
static void twi_config(void)
{
uint32_t err_code;
nrf_drv_twi_config_t const config = {
.scl = 16, //ARDUINO_SCL_PIN,
.sda = 17, //ARDUINO_SDA_PIN,
.frequency = NRF_DRV_TWI_FREQ_100K,
.interrupt_priority = APP_IRQ_PRIORITY_LOWEST,
.clear_bus_init = false
};
err_code = nrf_twi_mngr_init(&m_nrf_twi_mngr, &config);
APP_ERROR_CHECK(err_code);
}
static void lfclk_config(void)
{
uint32_t err_code;
err_code = nrf_drv_clock_init();
APP_ERROR_CHECK(err_code);
nrf_drv_clock_lfclk_request(NULL);
}
void timer_handler(void * p_context)
{
read_all();
}
void read_init(void)
{
ret_code_t err_code;
err_code = app_timer_create(&m_timer, APP_TIMER_MODE_REPEATED, timer_handler);
APP_ERROR_CHECK(err_code);
err_code = app_timer_start(m_timer, APP_TIMER_TICKS(50), NULL);
APP_ERROR_CHECK(err_code);
}
void log_init(void)
{
ret_code_t err_code;
err_code = NRF_LOG_INIT(NULL);
APP_ERROR_CHECK(err_code);
NRF_LOG_DEFAULT_BACKENDS_INIT();
}
/* TWI instance. */
static const nrf_drv_twi_t m_twi = NRF_DRV_TWI_INSTANCE(TWI_INSTANCE_ID);
int main(void)
{
ret_code_t err_code;
log_init();
bsp_board_init(BSP_INIT_LEDS);
// Start internal LFCLK XTAL oscillator - it is needed by BSP to handle
// buttons with the use of APP_TIMER and for "read_all" ticks generation
// (by RTC).
lfclk_config();
bsp_config();
err_code = nrf_pwr_mgmt_init();
APP_ERROR_CHECK(err_code);
NRF_LOG_RAW_INFO("\r\nTWI master example started. \r\n");
NRF_LOG_FLUSH();
twi_config();
//insert twi_scanner code
uint8_t address;
uint8_t sample_data;
bool detected_device = false;
#define TWI_ADDRESSES 127
for (address = 1; address <= TWI_ADDRESSES; address++)
{
err_code = nrf_drv_twi_rx(&m_twi, address, &sample_data, sizeof(sample_data));
if (err_code == NRF_SUCCESS)
{
detected_device = true;
NRF_LOG_INFO("TWI device detected at address 0x%x.", address);
}
NRF_LOG_FLUSH();
}
//insert twi_scanner code
while(1) {};
read_init();
// Initialize sensors.
APP_ERROR_CHECK(nrf_twi_mngr_perform(&m_nrf_twi_mngr, NULL, lm75b_init_transfers,
LM75B_INIT_TRANSFER_COUNT, NULL));
APP_ERROR_CHECK(nrf_twi_mngr_perform(&m_nrf_twi_mngr, NULL, mma7660_init_transfers,
MMA7660_INIT_TRANSFER_COUNT, NULL));
while (true)
{
nrf_pwr_mgmt_run();
NRF_LOG_FLUSH();
}
}
/** @} */
/**
* Copyright (c) 2016 - 2018, Nordic Semiconductor ASA
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form, except as embedded into a Nordic
* Semiconductor ASA integrated circuit in a product or a software update for
* such product, must reproduce the above copyright notice, this list of
* conditions and the following disclaimer in the documentation and/or other
* materials provided with the distribution.
*
* 3. Neither the name of Nordic Semiconductor ASA nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* 4. This software, with or without modification, must only be used with a
* Nordic Semiconductor ASA integrated circuit.
*
* 5. Any software provided in binary form under this license must not be reverse
* engineered, decompiled, modified and/or disassembled.
*
* THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
/** @file
* @defgroup tw_scanner main.c
* @{
* @ingroup nrf_twi_example
* @brief TWI Sensor Example main file.
*
* This file contains the source code for a sample application using TWI.
*
*/
#include <stdio.h>
#include "boards.h"
#include "app_util_platform.h"
#include "app_error.h"
#include "nrf_drv_twi.h"
#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"
/* TWI instance ID. */
#if TWI0_ENABLED
#define TWI_INSTANCE_ID 0
#elif TWI1_ENABLED
#define TWI_INSTANCE_ID 1
#endif
/* Number of possible TWI addresses. */
#define TWI_ADDRESSES 127
/* TWI instance. */
static const nrf_drv_twi_t m_twi = NRF_DRV_TWI_INSTANCE(TWI_INSTANCE_ID);
/**
* @brief TWI initialization.
*/
void twi_init (void)
{
ret_code_t err_code;
const nrf_drv_twi_config_t twi_config = {
.scl = 16, //ARDUINO_SCL_PIN,
.sda = 17, //ARDUINO_SDA_PIN,
.frequency = NRF_DRV_TWI_FREQ_100K,
.interrupt_priority = APP_IRQ_PRIORITY_HIGH,
.clear_bus_init = false
};
err_code = nrf_drv_twi_init(&m_twi, &twi_config, NULL, NULL);
APP_ERROR_CHECK(err_code);
nrf_drv_twi_enable(&m_twi);
}
/**
* @brief Function for main application entry.
*/
int main(void)
{
ret_code_t err_code;
uint8_t address;
uint8_t sample_data;
bool detected_device = false;
APP_ERROR_CHECK(NRF_LOG_INIT(NULL));
NRF_LOG_DEFAULT_BACKENDS_INIT();
NRF_LOG_INFO("TWI scanner started.");
NRF_LOG_FLUSH();
twi_init();
for (address = 1; address <= TWI_ADDRESSES; address++)
{
err_code = nrf_drv_twi_rx(&m_twi, address, &sample_data, sizeof(sample_data));
if (err_code == NRF_SUCCESS)
{
detected_device = true;
NRF_LOG_INFO("TWI device detected at address 0x%x.", address);
}
NRF_LOG_FLUSH();
}
if (!detected_device)
{
NRF_LOG_INFO("No device was found.");
NRF_LOG_FLUSH();
}
while (true)
{
/* Empty loop. */
}
}
/** @} */
/**
* Copyright (c) 2015 - 2018, Nordic Semiconductor ASA
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form, except as embedded into a Nordic
* Semiconductor ASA integrated circuit in a product or a software update for
* such product, must reproduce the above copyright notice, this list of
* conditions and the following disclaimer in the documentation and/or other
* materials provided with the distribution.
*
* 3. Neither the name of Nordic Semiconductor ASA nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* 4. This software, with or without modification, must only be used with a
* Nordic Semiconductor ASA integrated circuit.
*
* 5. Any software provided in binary form under this license must not be reverse
* engineered, decompiled, modified and/or disassembled.
*
* THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
/** @file
* @defgroup tw_sensor_example main.c
* @{
* @ingroup nrf_twi_example
* @brief TWI Sensor Example main file.
*
* This file contains the source code for a sample application using TWI.
*
*/
#include <stdio.h>
#include "boards.h"
#include "app_util_platform.h"
#include "app_error.h"
#include "nrf_drv_twi.h"
#include "nrf_delay.h"
#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"
/* TWI instance ID. */
#define TWI_INSTANCE_ID 0
/* Common addresses definition for temperature sensor. */
#define LM75B_ADDR (0x90U >> 1)
#define LM75B_REG_TEMP 0x00U
#define LM75B_REG_CONF 0x01U
#define LM75B_REG_THYST 0x02U
#define LM75B_REG_TOS 0x03U
/* Mode for LM75B. */
#define NORMAL_MODE 0U
/* Indicates if operation on TWI has ended. */
static volatile bool m_xfer_done = false;
/* TWI instance. */
static const nrf_drv_twi_t m_twi = NRF_DRV_TWI_INSTANCE(TWI_INSTANCE_ID);
/* Buffer for samples read from temperature sensor. */
static uint8_t m_sample;
/**
* @brief Function for setting active mode on MMA7660 accelerometer.
*/
void LM75B_set_mode(void)
{
ret_code_t err_code;
/* Writing to LM75B_REG_CONF "0" set temperature sensor in NORMAL mode. */
uint8_t reg[2] = {LM75B_REG_CONF, NORMAL_MODE};
err_code = nrf_drv_twi_tx(&m_twi, LM75B_ADDR, reg, sizeof(reg), false);
APP_ERROR_CHECK(err_code);
while (m_xfer_done == false);
/* Writing to pointer byte. */
reg[0] = LM75B_REG_TEMP;
m_xfer_done = false;
err_code = nrf_drv_twi_tx(&m_twi, LM75B_ADDR, reg, 1, false);
APP_ERROR_CHECK(err_code);
while (m_xfer_done == false);
}
/**
* @brief Function for handling data from temperature sensor.
*
* @param[in] temp Temperature in Celsius degrees read from sensor.
*/
__STATIC_INLINE void data_handler(uint8_t temp)
{
NRF_LOG_INFO("Temperature: %d Celsius degrees.", temp);
}
/**
* @brief TWI events handler.
*/
void twi_handler(nrf_drv_twi_evt_t const * p_event, void * p_context)
{
switch (p_event->type)
{
case NRF_DRV_TWI_EVT_DONE:
if (p_event->xfer_desc.type == NRF_DRV_TWI_XFER_RX)
{
data_handler(m_sample);
}
m_xfer_done = true;
break;
default:
break;
}
}
/**
* @brief UART initialization.
*/
void twi_init (void)
{
ret_code_t err_code;
const nrf_drv_twi_config_t twi_lm75b_config = {
.scl = 16, //ARDUINO_SCL_PIN,
.sda = 17, //ARDUINO_SDA_PIN,
.frequency = NRF_DRV_TWI_FREQ_100K,
.interrupt_priority = APP_IRQ_PRIORITY_HIGH,
.clear_bus_init = false
};
err_code = nrf_drv_twi_init(&m_twi, &twi_lm75b_config, twi_handler, NULL);
APP_ERROR_CHECK(err_code);
nrf_drv_twi_enable(&m_twi);
}
/**
* @brief Function for reading data from temperature sensor.
*/
static void read_sensor_data()
{
m_xfer_done = false;
/* Read 1 byte from the specified address - skip 3 bits dedicated for fractional part of temperature. */
ret_code_t err_code = nrf_drv_twi_rx(&m_twi, LM75B_ADDR, &m_sample, sizeof(m_sample));
APP_ERROR_CHECK(err_code);
}
#define TWI_ADDRESSES 127
/**
* @brief Function for main application entry.
*/
int main(void)
{
APP_ERROR_CHECK(NRF_LOG_INIT(NULL));
NRF_LOG_DEFAULT_BACKENDS_INIT();
NRF_LOG_INFO("\r\nTWI sensor example started.");
NRF_LOG_FLUSH();
twi_init();
//insert twi_scanner code
ret_code_t err_code;
uint8_t address;
uint8_t sample_data;
bool detected_device = false;
for (address = 1; address <= TWI_ADDRESSES; address++)
{
err_code = nrf_drv_twi_rx(&m_twi, address, &sample_data, sizeof(sample_data));
if (err_code == NRF_SUCCESS)
{
detected_device = true;
NRF_LOG_INFO("TWI device detected at address 0x%x.", address);
}
NRF_LOG_FLUSH();
}
while(1) {};
//insert twi_scanner code
LM75B_set_mode();
while (true)
{
nrf_delay_ms(500);
do
{
__WFE();
}while (m_xfer_done == false);
read_sensor_data();
NRF_LOG_FLUSH();
}
}
/** @} */
I attached the file that printed the output address
Also attached main.c
I would appreciate your advice on why this is happening.
