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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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4
firmware/libboard/octsimtest/include/board.h
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@@ -62,8 +62,10 @@
#define PIN_PHONE_IO {PIO_PA22A_TXD1, PIOA, ID_PIOA, PIO_PERIPH_A, PIO_DEFAULT}
/* Phone CLK clock input (CLK_PHONE in schematic) */
#define PIN_PHONE_CLK {PIO_PA23A_SCK1, PIOA, ID_PIOA, PIO_PERIPH_A, PIO_DEFAULT}
/* Pin used to switch level shifter in I/O line between rx (0) and tx (1) */
#define PIN_USIM1_IO_DIR {PIO_PA16, PIOA, ID_PIOA, PIO_PERIPH_A, PIO_OUTPUT_0}
/* Pin used for phone USIM slot 1 communication */
#define PINS_USIM1 PIN_PHONE_IO, PIN_PHONE_CLK, PIN_PHONE_CLK_INPUT, PIN_USIM1_VCC, PIN_PHONE_IO_INPUT, PIN_USIM1_nRST
#define PINS_USIM1 PIN_PHONE_IO, PIN_PHONE_CLK, PIN_PHONE_CLK_INPUT, PIN_USIM1_VCC, PIN_PHONE_IO_INPUT, PIN_USIM1_nRST, PIN_USIM1_IO_DIR
/* Phone I/O data signal input/output (unused USART RX input; connected to I/O_PHONE in schematic) */
#define PIN_PHONE_IO_INPUT {PIO_PA21A_RXD1, PIOA, ID_PIOA, PIO_PERIPH_A, PIO_DEFAULT}
/* Pin used as clock input (to measure the ETU duration; connected to CLK_PHONE in schematic) */