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octsimtest: Switch direction of I/O level shifter depending on uart tx / rx

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Contrary to other hardware designs, octsimtest has a level-shifter in
the I/O line to support testing with 1.8, 3 and 5V.  This level shifter
is bi-directional, but the direction needs to be explicitly specified
via the SIM_IO_DIR signal attached to PA26.

Change-Id: I44171363b5bd69d6049b12c86f8143be83557cb2
This commit is contained in:
Harald Welte
2021-06-02 17:33:21 +02:00
parent 31d103b9f6
commit 5b825beb41
2 changed files with 23 additions and 1 deletions
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20
firmware/libcommon/source/mode_cardemu.c
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@@ -42,6 +42,10 @@ static const Pin pins_cardsim[] = PINS_CARDSIM;
static const Pin pins_usim1[] = {PINS_USIM1};
static const Pin pin_usim1_rst = PIN_USIM1_nRST;
static const Pin pin_usim1_vcc = PIN_USIM1_VCC;
#ifdef PIN_USIM1_IO_DIR
static const Pin pin_io_dir = PIN_USIM1_IO_DIR;
#endif
#ifdef CARDEMU_SECOND_UART
static const Pin pins_usim2[] = {PINS_USIM2};
@@ -142,12 +146,27 @@ void card_emu_uart_wait_tx_idle(uint8_t uart_chan)
wait_tx_idle(usart);
}
static void card_emu_uart_set_direction(uint8_t uart_chan, bool tx)
{
/* only on some boards (octsimtest) we hae an external level
* shifter that requires us to switch the direction between RX and TX */
#ifdef PIN_USIM1_IO_DIR
if (uart_chan == 0) {
if (tx)
PIO_Set(&pin_io_dir);
else
PIO_Clear(&pin_io_dir);
}
#endif
}
/* call-back from card_emu.c to enable/disable transmit and/or receive */
void card_emu_uart_enable(uint8_t uart_chan, uint8_t rxtx)
{
Usart *usart = get_usart_by_chan(uart_chan);
switch (rxtx) {
case ENABLE_TX:
card_emu_uart_set_direction(uart_chan, true);
USART_DisableIt(usart, ~(US_IER_TXRDY | US_IER_TIMEOUT));
/* as irritating as it is, we actually want to keep the
* receiver enabled during transmit */
@@ -173,6 +192,7 @@ void card_emu_uart_enable(uint8_t uart_chan, uint8_t rxtx)
* transmitter enabled during receive */
USART_SetTransmitterEnabled(usart, 1);
wait_tx_idle(usart);
card_emu_uart_set_direction(uart_chan, false);;
usart->US_CR = US_CR_RSTSTA | US_CR_RSTIT | US_CR_RSTNACK;
USART_EnableIt(usart, US_IER_RXRDY);
USART_SetReceiverEnabled(usart, 1);