Hi,
I'm using FRDM-KL03Z dev. board which has attached sigfox controller (send AT command reply with OK or value or ERROR). I used some lpuart example which can be found in MCUXpresso IDE but example was with receiving 1 char only. I connected LP uart (which is debug console by unsoldering 2 resistors) and I can send AT command but have hard times to receive multiple chars from sigfox device. Code example:
lpuart_config_t config;
CLOCK_SetLpuart0Clock(1U);
/*
* config.baudRate_Bps = 38400U;
* config.parityMode = kLPUART_ParityDisabled;
* config.stopBitCount = kLPUART_OneStopBit;
* config.txFifoWatermark = 0;
* config.rxFifoWatermark = 0;
* config.enableTx = false;
* config.enableRx = false;
*/
LPUART_GetDefaultConfig(&config);
config.baudRate_Bps = 9600;
config.enableTx = true;
config.enableRx = true;
LPUART_Init(DEMO_LPUART, &config, CLOCK_GetFreq(DEMO_LPUART_CLKSRC));
if (writable(DEMO_LPUART)) {
LPUART_WriteBlocking(DEMO_LPUART, "AT$I=10\n\r", 9);
status_t status;
while(true) {
if (readable(DEMO_LPUART)) {
status = LPUART_ReadBlocking(DEMO_LPUART, buf, sizeof(buf));
if (status == kStatus_Success)
break;
}
}
if (buf[0] == 'O')
GPIO_TogglePinsOutput(BOARD_LED_GPIO, 1U << BOARD_LED_GPIO_PIN);
}with this code pushed to main.c I can receive chars from sigfox module (but strange for me is why I need to use while loop) as internally LPUART_ReadBlocking looping for whole buffer. Also when move code to different file and create wrapper I cannot receive anything (it is looping forever in receive routine).
/*
* sigfox.c
*
* Created on: Sep 4, 2017
* Author: marekbelisko
*/
#include "sigfox.h"
#define SIGFOX_STATUS "AT\n\r"
#define SIGFOX_DEVICE_ID "AT$I=10\n\r"
#define SIGFOX_PAC "AT$I=11\n\r"
#define SIGFOX_VOLTAGE "AT$V?\n\r"
#define SIGFOX_TEMPERATURE "AT$T?\n\r"
// global UART handle
static LPUART_Type *g_uart = NULL;
static uint8_t g_buf[20] = {0};
static bool writable(LPUART_Type *base) {
return (LPUART_GetStatusFlags(base)&LPUART_STAT_TDRE_MASK)!=0;
}
static bool readable(LPUART_Type *base) {
return (LPUART_GetStatusFlags(base)&LPUART_STAT_RDRF_MASK)!=0;
}
void setUart(LPUART_Type *uart)
{
g_uart = uart;
}
int sendMessage(const char *buf)
{
uint8_t *msg = NULL;
msg = sendReceiveMessage(buf);
return ((msg != NULL) && (msg[0] == 'O' && msg[1] == 'K')) ? 1 : 0;
}
uint8_t * sendReceiveMessage(const char *data)
{
if (g_uart == NULL)
return NULL;
if (writable(g_uart)) {
LPUART_WriteBlocking(g_uart, (uint8_t *)data, strlen(data));
status_t status;
while(true) {
if (readable(g_uart)) {
status = LPUART_ReadBlocking(g_uart, g_buf, sizeof(g_buf));
if (status == kStatus_Success)
break;
}
}
/* this is not nice but I cannot figure out how to do it properly :)
while (true) {
if (readable(g_uart)) {
if (LPUART_ReadBlocking(g_uart, g_buf, sizeof(g_buf)) == kStatus_Success)
break;
}
}*/
}
return g_buf;
}
bool sigfox_status() { return sendMessage(SIGFOX_STATUS); }
uint8_t *sigfox_device_id() { return sendReceiveMessage(SIGFOX_DEVICE_ID); }
uint8_t *sigfox_pac() { return sendReceiveMessage(SIGFOX_PAC); }
uint8_t *sigfox_voltage() { return sendReceiveMessage(SIGFOX_VOLTAGE); }
uint8_t *sigfox_temperature() { return sendReceiveMessage(SIGFOX_TEMPERATURE); }
Any ideas what I'm doing wrong? I'm fighting with this simple task for few days already 
. Thanks
