Hi,
I am getting lots of transmission errors using the Serial library. I changed the Serial_Uartes example by removing the serial1 interface and creating a simple loopback at 115,200 bps.
Just by holding a key on the keyboard on a screen serial connection creates lots of lost bits. What could be the problem?
Below is the modified code for .../examples/peripherial/serial_uartes/main.c
(....)
#include "app_error.h"
#include "app_util.h"
#include "boards.h"
/** @file
* @defgroup nrf_serial_uartes_example main.c
* @{
* @ingroup nrf_serial_uartes_example
* @brief Example of @ref nrf_serial usage. Loopback example using two UARTE peripherals.
* Please short Arduino SCL and SDA GPIOs to start transmission.
*
*/
#define OP_QUEUES_SIZE 3
#define APP_TIMER_PRESCALER NRF_SERIAL_APP_TIMER_PRESCALER
static void sleep_handler(void)
{
__WFE();
__SEV();
__WFE();
}
NRF_SERIAL_DRV_UART_CONFIG_DEF(m_uarte0_drv_config,
RX_PIN_NUMBER, TX_PIN_NUMBER,
RTS_PIN_NUMBER, CTS_PIN_NUMBER,
NRF_UART_HWFC_DISABLED, NRF_UART_PARITY_EXCLUDED,
NRF_UART_BAUDRATE_115200,
UART_DEFAULT_CONFIG_IRQ_PRIORITY);
NRF_SERIAL_DRV_UART_CONFIG_DEF(m_uarte1_drv_config,
ARDUINO_SDA_PIN, ARDUINO_SCL_PIN,
RTS_PIN_NUMBER, CTS_PIN_NUMBER,
NRF_UART_HWFC_DISABLED, NRF_UART_PARITY_EXCLUDED,
NRF_UART_BAUDRATE_115200,
UART_DEFAULT_CONFIG_IRQ_PRIORITY);
#define SERIAL_FIFO_TX_SIZE 256
#define SERIAL_FIFO_RX_SIZE 256
NRF_SERIAL_QUEUES_DEF(serial0_queues, SERIAL_FIFO_TX_SIZE, SERIAL_FIFO_RX_SIZE);
NRF_SERIAL_QUEUES_DEF(serial1_queues, SERIAL_FIFO_TX_SIZE, SERIAL_FIFO_RX_SIZE);
#define SERIAL_BUFF_TX_SIZE 1
#define SERIAL_BUFF_RX_SIZE 1
NRF_SERIAL_BUFFERS_DEF(serial0_buffs, SERIAL_BUFF_TX_SIZE, SERIAL_BUFF_RX_SIZE);
NRF_SERIAL_BUFFERS_DEF(serial1_buffs, SERIAL_BUFF_TX_SIZE, SERIAL_BUFF_RX_SIZE);
NRF_SERIAL_CONFIG_DEF(serial0_config, NRF_SERIAL_MODE_DMA,
&serial0_queues, &serial0_buffs, NULL, sleep_handler);
NRF_SERIAL_CONFIG_DEF(serial1_config, NRF_SERIAL_MODE_DMA,
&serial1_queues, &serial1_buffs, NULL, sleep_handler);
NRF_SERIAL_UART_DEF(serial0_uarte, 0);
NRF_SERIAL_UART_DEF(serial1_uarte, 1);
int main(void)
{
ret_code_t ret;
ret = nrf_drv_clock_init();
APP_ERROR_CHECK(ret);
ret = nrf_drv_power_init(NULL);
APP_ERROR_CHECK(ret);
nrf_drv_clock_lfclk_request(NULL);
ret = app_timer_init();
APP_ERROR_CHECK(ret);
// Initialize LEDs and buttons.
bsp_board_init(BSP_INIT_LEDS | BSP_INIT_BUTTONS);
ret = nrf_serial_init(&serial0_uarte, &m_uarte0_drv_config, &serial0_config);
APP_ERROR_CHECK(ret);
// ret = nrf_serial_init(&serial1_uarte, &m_uarte1_drv_config, &serial1_config);
// APP_ERROR_CHECK(ret);
static char tx_message[] = "Hello nrf_serial!\n\r";
ret = nrf_serial_write(&serial0_uarte,
tx_message,
strlen(tx_message),
NULL,
NRF_SERIAL_MAX_TIMEOUT);
(void)nrf_serial_flush(&serial0_uarte, 0);
while (true)
{
char c;
ret = nrf_serial_read(&serial0_uarte, &c, sizeof(c), NULL, 0);
if (ret != NRF_SUCCESS)
{
continue;
}
(void)nrf_serial_write(&serial0_uarte, &c, sizeof(c), NULL, 0);
(void)nrf_serial_flush(&serial0_uarte, 0);
//ret = nrf_serial_read(&serial1_uarte, &c, sizeof(c), NULL, 1000);
// if (ret != NRF_SUCCESS)
//{
// continue;
//}
//(void)nrf_serial_write(&serial1_uarte, &c, sizeof(c), NULL, 0);
//(void)nrf_serial_flush(&serial1_uarte, 0);
}
}
The result from a terminal with the a key pressed, looks:
Hello nrf_serial!
aaa�aa�aaaaaaaaaaaaaaaaaaaaaaaaaaaa�aaa��aa�aaaaaaaa�a�a�aaaaaaaaaaaaa��aaaaaaaaaaa�aaaaaaaaaaaaaaaa�aaa�a�aaaaaaaaaaaa�a��aaa�a�aaaaaaaaaaa�aaa�a��aaaaaaaa�aaaaaaaaaaaaaaaaaaaaaaaaa�aaaaaa�aa�aaaaaa�aaaaaaaaaaaaaaaaa�aaaaaaaaaaaaaaaaaa�aaaaaaaa�aaaaaaaaaaaaaaaaaaaaa�aaa�a��aaa�aaaaaaaa�aaaaaaaaaaaaaaaaa�a�aaaaaa��aaaa
I am using the DK pca_10065 board, this is running on the Release configuration, connected through the USB port to a Mac.
I am using this example as a basis for a software that should transmit data reliably between a PC and a BLE sensor on the other side, but just between the board and the PC the communication seems to be very flaky.
Will appreciate any help!
Thanks,
Juan
