Hi,
I need to use external eeprom memory AT24C256. I have not found any example for nrf52, so I started with migration existing arduino code to Nordic´s. Here is the Arduino code and below is my migration of this code, which did not work (the output read is always 255). Please any tip or help? Nordic sketch to which i am migration Arduino code is twi sensor fro m SDK15.2.
/**
* Copyright (c) 2015 - 2019, Nordic Semiconductor ASA
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
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*
* 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.
*
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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*/
/** @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
#define eeprom 0x50
/* 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);
void write_eeprom(int dev_addr, uint8_t start_addr, uint8_t * data) {
ret_code_t err_code;
uint8_t setup1 = start_addr >> 8;
uint8_t setup2 = start_addr & 0xFF;
m_xfer_done = false;
err_code = nrf_drv_twi_tx(&m_twi, eeprom, &setup1, sizeof(setup1), false);
while (m_xfer_done == false);
m_xfer_done = false;
err_code = nrf_drv_twi_tx(&m_twi, eeprom, &setup2, sizeof(setup2), false);
while (m_xfer_done == false);
//nrf_delay_ms(20);
m_xfer_done = false;
err_code = nrf_drv_twi_tx(&m_twi, eeprom, data, sizeof(data), false);
while (m_xfer_done == false);
APP_ERROR_CHECK(err_code);
}
uint8_t read_eeprom(int dev_addr, uint8_t start_addr)
{
ret_code_t err_code;
uint8_t read_data;
uint8_t setup1 = start_addr >> 8;
uint8_t setup2 = start_addr & 0xFF;
m_xfer_done = false;
err_code = nrf_drv_twi_tx(&m_twi, eeprom, &setup1, sizeof(setup1), false);
while (m_xfer_done == false);
m_xfer_done = false;
err_code = nrf_drv_twi_tx(&m_twi, eeprom, &setup2, sizeof(setup2), false);
while (m_xfer_done == false);
//nrf_delay_ms(20);
m_xfer_done = false;
err_code = nrf_drv_twi_rx(&m_twi, eeprom, &read_data, sizeof(read_data));
while (m_xfer_done == false);
//nrf_delay_ms(20);
APP_ERROR_CHECK(err_code);
return read_data;
}
/**
* @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:
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 = ARDUINO_SCL_PIN,
.sda = 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 main application entry.
*/
int main(void)
{
uint8_t data = 0x24;
uint8_t read_data;
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();
write_eeprom(eeprom, 100, &data);
nrf_delay_ms(10);
read_data = read_eeprom(eeprom, 100);
while (true)
{
//read_data = read_eeprom(eeprom, 100);
nrf_delay_ms(200);
//NRF_LOG_INFO("DATA: %d", read_data);
NRF_LOG_INFO(" DATA: %d",read_data);
//SEGGER_RTT_printf(0,"%d\n",read_data);
//NRF_LOG_FLUSH();
}
}
/** @} */
thanks in andvance
Pepam
