mirror of https://gerrit.osmocom.org/simtrace2
sniff: add WT timeout detection using USART timeout (TC is not required)
Change-Id: I4ec6e812e7e1eb91005027d2e864fc315550d79c
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15a3384e9a
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@ -193,11 +193,9 @@ static void change_state(enum iso7816_3_sniff_state iso_state_new)
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switch (iso_state_new) {
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case ISO7816_S_RESET:
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update_fidi(sniff_usart.base, 0x11); /* reset baud rate to default Di/Fi values */
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// TODO disable USART and TC
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break;
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case ISO7816_S_WAIT_ATR:
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rbuf_reset(&sniff_buffer); /* reset buffer for new communication */
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// TODO enable USART and TC
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break;
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case ISO7816_S_IN_ATR:
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atr_i = 0;
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@ -613,6 +611,30 @@ void Sniffer_usart_isr(void)
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/* Store sniffed data into buffer (also clear interrupt */
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rbuf_write(&sniff_buffer, byte);
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}
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/* Verify it WT timeout occurred, to detect unresponsive card */
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if (csr & US_CSR_TIMEOUT) {
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/* Stop timeout until next character is received */
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sniff_usart.base->US_CR |= US_CR_STTTO;
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/* Use timeout to detect end of ATR/PPS/TPDU */
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switch (iso_state) {
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case ISO7816_S_RESET:
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case ISO7816_S_WAIT_ATR:
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break;
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case ISO7816_S_IN_ATR:
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change_state(ISO7816_S_WAIT_ATR);
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break;
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case ISO7816_S_WAIT_TPDU:
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break;
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case ISO7816_S_WAIT_PPS_RSP:
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case ISO7816_S_IN_TPDU:
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case ISO7816_S_IN_PPS_REQ:
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case ISO7816_S_IN_PPS_RSP:
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change_state(ISO7816_S_WAIT_TPDU);
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break;
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default:
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break;
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}
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}
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}
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/** PIO interrupt service routine to checks if the card reset line has changed
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@ -699,8 +721,10 @@ void Sniffer_init(void)
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ISO7816_Init(&sniff_usart, CLK_SLAVE);
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/* Only receive data when sniffing */
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USART_SetReceiverEnabled(sniff_usart.base, 1);
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/* Enable interrupt to indicate when data has been received */
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USART_EnableIt(sniff_usart.base, US_IER_RXRDY);
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/* Enable Receiver time-out WT to detect unresponsive cards */
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sniff_usart.base->US_RTOR = 9600-12; /* -12 because the timer starts at the end of the 12 ETU frame */
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/* Enable interrupt to indicate when data has been received or timeout occurred */
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USART_EnableIt(sniff_usart.base, US_IER_RXRDY | US_IER_TIMEOUT);
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/* Enable interrupt requests for the USART peripheral */
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NVIC_EnableIRQ(IRQ_USART_SIM);
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