We have used the Sparkfun M7E Hecto module EVK in our design.
I have ported this example([Example1_Constant_Read] for my application which is in C. I want to configure mode “Read once” and timeout should be 1sec.
Apart from it I want to configure GEN2 settings which are,
RFmode: RFMODE_160_M8_20
Session: S2
Target :AB
Can you please provide APIs for that? I have checked with windows tool and these parameters are giving best results without generating mode heat.
`void read_tags(void)
{
PRINTF(“[UHF] Starting multi-tag read…\r\n”);
uint32_t start = xTaskGetTickCount();
startReading();
while ((xTaskGetTickCount() - start) < pdMS_TO_TICKS(1000))
{
// Step 1: Receive 3-byte header
usart_transfer_t rxHeader = {
.data = msg,
.dataSize = 3
};
if (USART_TransferReceiveNonBlocking(UHF_USART, &g_uartHandle, &rxHeader, NULL) != kStatus_Success ||
xSemaphoreTake(uhf_rx_done_sema, pdMS_TO_TICKS(200)) != pdTRUE)
{
continue;
}
uint8_t len = msg[1];
uint8_t opcode = msg[2];
if (len + 7 > MAX_MSG_SIZE)
{
PRINTF("Invalid length %d\r\n", len);
continue;
}
// Step 2: Receive remaining payload + 2 status + 2 CRC
usart_transfer_t rxPayload = {
.data = &msg[3],
.dataSize = len + 4
};
if (USART_TransferReceiveNonBlocking(UHF_USART, &g_uartHandle, &rxPayload, NULL) != kStatus_Success ||
xSemaphoreTake(uhf_rx_done_sema, pdMS_TO_TICKS(200)) != pdTRUE)
{
continue;
}
uint8_t fullLen = len + 7;
// Step 3: CRC check
uint16_t crc_calc = calculateCRC(&msg[1], fullLen - 3);
uint16_t crc_recv = (msg[fullLen - 2] << 8) | msg[fullLen - 1];
if (crc_calc != crc_recv)
{
PRINTF("Bad CRC (calc=0x%04X, recv=0x%04X)\r\n", crc_calc, crc_recv);
continue;
}
// Step 4: Process tag
if (opcode == TMR_SR_OPCODE_READ_TAG_ID_MULTIPLE)
{
if (fullLen < 32) // Minimum size for valid tag packet
{
PRINTF("Too short for EPC\n");
continue;
}
uint8_t epcLength = getTagEPCBytes();
uint8_t epcBuf[epcLength];
PRINTF("EPC [ ");
for (uint8_t i = 0; i < epcLength; i++)
{
epcBuf[i] = msg[31 + i];
if (epcBuf[i] < 0x10) PRINTF("0");
PRINTF("%X ", epcBuf[i]);
}
PRINTF("]\r\n");
add_to_list_if_not_present(epcBuf);
}
else if (opcode == RESPONSE_IS_KEEPALIVE)
{
PRINTF("[Keepalive]\r\n");
}
else
{
PRINTF("Unknown opcode: 0x%02X\r\n", opcode);
}
}
stopReading();
PRINTF("[UHF] Multi-tag read complete.\r\n");
}`
I have noticed that readTagEPC(myEPC, &myEPClength, 1000); this API is giving only one tag
