Hi,
I am using nRF52832 soc to develop my project. with nRF5_SDK_15.3 . SES file
I need to connect both BMI160 accelerometer sensor and AT24C512 EEPROM ic in TWI.
how to use TWI with this. guide me to use both at a time.
BMI160 separately i can read the data.
but i can't read while connect to AT24C512
Hi,
I recommend reading the TWIM chapter and the TWIS chapter in the product specification for nRF52832.
The master device (TWIM) is in your case the nRF58832, while sensor and EEPROM are slaves.
If your nRF52832 will work as a slave (TWIS), then you need another microcontroller functioning as a master.
You will find a suitable example to communicate with two devices in the TWI Transaction Manager Example which I linked to yesterday.
Kind regards,
Øyvind
Can you please tell me what is the difference of TWI0 and TWI1
Again, look at the Product Specification!
The Block Diagram clearly shows you that there are two TWIM modules - called "TWIM0" and "TWIM1":
Yes, you could use both modules - with one slave on each.
But the whole point of I2C as a bus is that each one can support multiple peripherals - as Øyvind showed:
hi,
please verify the code:
#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 "bmi160.h"
#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"
#define G_TO_LSB (16384.0f)
#define DPS_TO_LSB (131.072f)
#define I2C_24C128_SLAVE_ADDR (0x57)
#define BMI160_I2C_ADDR1 UINT8_C(0x68)
#define ARDUINO1_I2C_SCL_PIN 30
#define ARDUINO1_I2C_SDA_PIN 31
/* TWI instance ID. */
#define TWI0_INSTANCE_ID 0
#define TWI1_INSTANCE_ID 1
struct bmi160_dev sensor;
struct bmi160_sensor_data accel;
struct bmi160_sensor_data gyro;
struct bmi160_int_settg int_config;
int8_t rslt = BMI160_OK;
/* Indicates if operation on TWI has ended. */
static volatile bool m_xfer_done = false;
/* TWI instance. */
static const nrf_drv_twi_t m_twi_mma_EEP = NRF_DRV_TWI_INSTANCE(TWI0_INSTANCE_ID);
static const nrf_drv_twi_t m_twi = NRF_DRV_TWI_INSTANCE(TWI1_INSTANCE_ID);
void eep_WriteByte(uint16_t eep_address, unsigned char val);
unsigned char eep_readByte(uint16_t eep_address);
ret_code_t err_codecpy;
float accelX;
void twi_init (void)
{
ret_code_t err_code;
const nrf_drv_twi_config_t twi_mma_EEP_config = {
.scl = ARDUINO1_I2C_SCL_PIN,
.sda = ARDUINO1_I2C_SDA_PIN,
.frequency = NRF_DRV_TWI_FREQ_100K,
.interrupt_priority = APP_IRQ_PRIORITY_HIGH,
};
const nrf_drv_twi_config_t twi_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_mma_EEP, &twi_mma_EEP_config, NULL, NULL); //twi_handler
APP_ERROR_CHECK(err_code);
if (NRF_SUCCESS == err_code)
{
nrf_drv_twi_enable(&m_twi_mma_EEP);
NRF_LOG_INFO("TWI0 init success...");
}
err_code = nrf_drv_twi_init(&m_twi, &twi_config, NULL, NULL);
APP_ERROR_CHECK(err_code);
if (NRF_SUCCESS == err_code)
{
nrf_drv_twi_enable(&m_twi);
NRF_LOG_INFO("TWI init success...");
}
err_codecpy=err_code;
nrf_delay_ms(5);
}
unsigned char eep_readByte(uint16_t eep_address){
unsigned char eep_by_address[2];
unsigned char reg=0;
eep_by_address[1] = eep_address;
eep_by_address[0] = (unsigned char)(eep_address << 8);
// setting the start address
nrf_drv_twi_tx(&m_twi_mma_EEP, I2C_24C128_SLAVE_ADDR, eep_by_address, 2, true);
// read a byte
nrf_delay_ms(5);
nrf_drv_twi_rx(&m_twi_mma_EEP, I2C_24C128_SLAVE_ADDR, ®,1);
nrf_delay_ms(5);
return reg;
}
void eep_WriteByte(uint16_t eep_address, unsigned char val){
unsigned char eep_by_address[3];
eep_by_address[2] = val;
eep_by_address[1] = eep_address;
eep_by_address[0] = (unsigned char)(eep_address << 8);
err_codecpy = nrf_drv_twi_tx(&m_twi_mma_EEP, I2C_24C128_SLAVE_ADDR, eep_by_address, 3, false);
nrf_delay_ms(5);
if(err_codecpy == 0)
{
NRF_LOG_INFO("\r\nWritten Sucess");
NRF_LOG_FLUSH();
}
}
int8_t Acc_i2c_Write(uint8_t dev_id, uint8_t reg_addr, uint8_t *reg_data, uint16_t len)
{
// NRF_LOG_INFO("WRITE: dev_id: %x reg_addr: %x reg_data: %x len: %i\n", dev_id, reg_addr, *reg_data, len);
int8_t rslt = 0;
uint8_t data[len + 1];
data[0] = reg_addr;
for (uint16_t i = 0; i < len; i++) {
data[i + 1] = reg_data[i];
}
rslt = nrf_drv_twi_tx(&m_twi, dev_id, data, len + 1, false);
APP_ERROR_CHECK(rslt);
return rslt;
}
int8_t Acc_i2c_Read(uint8_t dev_id, uint8_t reg_addr, uint8_t *reg_data, uint16_t len)
{
int8_t rslt = 0;
// NRF_LOG_INFO("READ: dev_id: %x reg_addr: %x len: %i\n", dev_id, reg_addr, len);
rslt = nrf_drv_twi_tx(&m_twi, dev_id, ®_addr, 1, false);
APP_ERROR_CHECK(rslt);
if (rslt == 0)
{
rslt = nrf_drv_twi_rx(&m_twi, dev_id, reg_data, len);
}
// NRF_LOG_INFO("READ: %x",*reg_data);
return rslt;
}
void Acc_delay_ms(uint32_t period)
{
/*if (period==NULL){
period = 1;
}// delay time*/
nrf_delay_ms( period ) ;
}
void BMI_init (void)
{
sensor.id = BMI160_I2C_ADDR; //0x69
sensor.interface = BMI160_I2C_INTF; //0x00
sensor.read = &Acc_i2c_Read;
sensor.write = &Acc_i2c_Write;
sensor.delay_ms = &Acc_delay_ms;
rslt = bmi160_init(&sensor);
APP_ERROR_CHECK(rslt);
if(rslt == BMI160_OK){
NRF_LOG_INFO("BMI160 Initialized...");
} else {
NRF_LOG_INFO("BMI160 not Initialized...");
}NRF_LOG_FLUSH();
sensor.accel_cfg.odr = BMI160_ACCEL_ODR_1600HZ;
sensor.accel_cfg.range = BMI160_ACCEL_RANGE_2G;
sensor.accel_cfg.bw = BMI160_ACCEL_BW_NORMAL_AVG4;
sensor.accel_cfg.power = BMI160_ACCEL_NORMAL_MODE;
sensor.gyro_cfg.odr = BMI160_GYRO_ODR_3200HZ;
sensor.gyro_cfg.range = BMI160_GYRO_RANGE_2000_DPS;
sensor.gyro_cfg.bw = BMI160_GYRO_BW_NORMAL_MODE;
sensor.gyro_cfg.power = BMI160_GYRO_NORMAL_MODE;
rslt = bmi160_set_sens_conf(&sensor);
APP_ERROR_CHECK(rslt);
if(rslt == BMI160_OK){
NRF_LOG_INFO("sensor Configured...");
} else {
NRF_LOG_INFO("sensor not Configured...");
}NRF_LOG_FLUSH();
}
static void read_sensor_data()
{
m_xfer_done = false;
bmi160_get_sensor_data((BMI160_ACCEL_SEL | BMI160_GYRO_SEL | BMI160_TIME_SEL), &accel, &gyro, &sensor);
/*NRF_LOG_INFO("DataX:%d", accel.x);
NRF_LOG_INFO("DataY:%d", accel.y);
NRF_LOG_INFO("DataZ:%d", accel.z);
NRF_LOG_INFO("GyroX:%d", gyro.x);
NRF_LOG_INFO("GyroY:%d", gyro.y);
NRF_LOG_INFO("GyroZ:%d", gyro.z);*/
/* need the calculation to study */
accelX = ((((float)accel.x) / G_TO_LSB) * 9.80655); // in m/s^2
float gyrX = ((((float)gyro.x) / DPS_TO_LSB) * 0.0174532925); // in rad/sec
NRF_LOG_INFO("DataX in m/s^2 : " NRF_LOG_FLOAT_MARKER,
NRF_LOG_FLOAT( accelX));
NRF_LOG_INFO("DataY in rad/sec : " NRF_LOG_FLOAT_MARKER,
NRF_LOG_FLOAT(gyrX));
NRF_LOG_FLUSH();
}
/**
* @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();
NRF_LOG_FLUSH();
unsigned char reg1 = 0;
Acc_delay_ms(50);
BMI_init();
Acc_delay_ms(100);
uint8_t reg_addr = BMI160_CHIP_ID_ADDR;
uint8_t data;
uint16_t len = 1;
Acc_delay_ms(1000);
rslt = bmi160_get_regs(reg_addr, &data, len, &sensor);
NRF_LOG_INFO("Data:%x", data);
eep_WriteByte(0x0000,data);
while(true)
{
nrf_delay_ms(1000);
// eep_WriteByte(0x0000,'w');
nrf_delay_ms(5);
//eep_WriteByte(0x0001,'B');
nrf_delay_ms(5);
reg1=eep_readByte(0x0000);
if(reg1!=0){
NRF_LOG_INFO("\r\n Read value 00 : %x",reg1);
NRF_LOG_FLUSH();
nrf_delay_ms(5);
}
else if(reg1==0){
nrf_delay_ms(5);
}
reg1=eep_readByte(0x00051);
if(reg1!=0){
NRF_LOG_INFO("\r\n Read value 51 : %c",reg1);
NRF_LOG_FLUSH();
nrf_delay_ms(5);
}
else if(reg1==0){
nrf_delay_ms(5);
}
read_sensor_data();
eep_WriteByte(0x00051,accelX);
reg1=eep_readByte(0x00051);
if(reg1!=0){
NRF_LOG_INFO("\r\n Read value 51 : %d",reg1);
NRF_LOG_FLUSH();
nrf_delay_ms(5);
}
else if(reg1==0){
nrf_delay_ms(5);
}
}
}
output:
it works in two different TWI wire pins
that is
eeprom scl in 27
eeprom sda in 26
bmi scl in 30
bmi sda in 31
.
if i give same sda and scl pin to eeprom and bmi. it gives fatal error ;
can you give how to manage this in single TWI wire.
i have seen TWI mangr
in that
i have difficult to interface the eeprom with bmi
can you give a solution
when i changed the different scl sda pins separate then it works
That has already been explained to you: you cannot have two different TWI Masters sharing the same pins!
i need to connect both eeprom and sensor in a same pins
Then you must use just one TWI Master - as Øyvind showed you in the diagram he posted earlier:
