Hello,
I'm trying to interface this cheap OLED display from ebay
and while running and debugging the code I think should work(all based off the TWI_sensor sdk example just edited it to my need) the code gets stuck in the loop: while (m_xfer_done == false);
while the err_code is 0x00
here's the code using the TWI scanner the address of the device was found to be 0x3C:
#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 OLED_ADDR (0x78U >> 1)
#define OLED_REG_TEMP 0x00U
#define OLED_REG_CONF 0x81U
#define OLED_REG_THYST 0x02U
#define OLED_REG_TOS 0x03U
/*
#define NORMAL_MODE 0XAF
/* 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;
void OLED_set_mode(void)
{
ret_code_t err_code;
uint8_t reg[2] = {OLED_REG_CONF, NORMAL_MODE};
err_code = nrf_drv_twi_tx(&m_twi, OLED_ADDR, reg, sizeof(reg), false);
APP_ERROR_CHECK(err_code);
while (m_xfer_done == false);
}
void OLED_set_contrast(void)
{
ret_code_t err_code;
uint8_t reg[3] = {0x00,0x81, 0x80};
err_code = nrf_drv_twi_tx(&m_twi, OLED_ADDR, reg, sizeof(reg), false);
APP_ERROR_CHECK(err_code);
while (m_xfer_done == false);
}
void OLED_set_display(void)
{
ret_code_t err_code;
/* Writing to LM75B_REG_CONF "0" set temperature sensor in NORMAL mode. */
uint8_t reg[2] = {0x00,0xA5};
err_code = nrf_drv_twi_tx(&m_twi, OLED_ADDR, reg, sizeof(reg), 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);
}
void OLED_set_inverse(void)
{
ret_code_t err_code;
/* Writing to LM75B_REG_CONF "0" set temperature sensor in NORMAL mode. */
uint8_t reg[2] = {0x00,0xA7};
err_code = nrf_drv_twi_tx(&m_twi, OLED_ADDR, reg, sizeof(reg), false);
APP_ERROR_CHECK(err_code);
while (m_xfer_done == false);
}
/**
* @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_oled_config = {
.scl = ARDUINO_SCL_PIN,
.sda = ARDUINO_SDA_PIN,
.frequency = NRF_TWI_FREQ_100K,
.interrupt_priority = APP_IRQ_PRIORITY_HIGH,
.clear_bus_init = false
};
err_code = nrf_drv_twi_init(&m_twi, &twi_oled_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_oled_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, OLED_ADDR, &m_sample, sizeof(m_sample));
APP_ERROR_CHECK(err_code);
}
/**
* @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");
NRF_LOG_FLUSH();
twi_init();
OLED_set_mode();
OLED_set_contrast();
OLED_set_display();
OLED_set_inverse();
while (true)
{
nrf_delay_ms(500);
do
{
__WFE();
}while (m_xfer_done == false);
// read_sensor_data();
NRF_LOG_FLUSH();
}
}
/** @} */
and here is the table from the datasheet:
