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unittester: Implement status register and 0x00 "No-op" command

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GreaseMonkey
2024-01-07 17:20:19 +13:00
parent 04eb9ffc3e
commit d1133a7c7f
2 changed files with 38 additions and 8 deletions
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44
src/device/unittester.c
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@@ -39,6 +39,20 @@ enum fsm2_value {
UT_FSM2_WAIT_IOBASE_1,
};
/* Status bit mask */
#define UT_STATUS_AWAITING_READ (1<<0)
#define UT_STATUS_AWAITING_WRITE (1<<1)
#define UT_STATUS_IDLE (1<<2)
#define UT_STATUS_UNSUPPORTED_CMD (1<<3)
/* Command list */
enum unittester_cmd {
UT_CMD_NOOP = 0x00,
UT_CMD_CAPTURE_SCREEN_SNAPSHOT = 0x01,
UT_CMD_READ_SCREEN_SNAPSHOT_RECTANGLE = 0x02,
UT_CMD_VERIFY_SCREEN_SNAPSHOT_RECTANGLE = 0x03,
};
struct unittester_state {
/* I/O port settings */
uint16_t trigger_port;
@@ -50,6 +64,10 @@ struct unittester_state {
/* FSM2: IOBASE port selection, once trigger is activated */
enum fsm2_value fsm2;
uint16_t fsm2_new_iobase;
/* Runtime state */
uint8_t status;
enum unittester_cmd cmd_id;
};
static struct unittester_state unittester;
static const struct unittester_state unittester_defaults = {
@@ -57,6 +75,7 @@ static const struct unittester_state unittester_defaults = {
.iobase_port = 0xFFFF,
.fsm1 = UT_FSM1_WAIT_8,
.fsm2 = UT_FSM2_IDLE,
.status = UT_STATUS_IDLE,
};
/* FIXME TEMPORARY --GM */
@@ -85,8 +104,22 @@ unittester_write(uint16_t port, uint8_t val, UNUSED(void *priv))
{
if (port == unittester.iobase_port+0x00) {
/* Command port */
/* TODO! --GM */
unittester_log("[UT] W %02X Command\n", val);
switch (val) {
/* 0x00: No-op */
case UT_CMD_NOOP:
unittester.cmd_id = UT_CMD_NOOP;
unittester.status = UT_STATUS_IDLE;
break;
/* Unsupported command - terminate here */
default:
unittester.cmd_id = UT_CMD_NOOP;
unittester.status = UT_STATUS_IDLE | UT_STATUS_UNSUPPORTED_CMD;
break;
}
} else if (port == unittester.iobase_port+0x01) {
/* Data port */
/* TODO! --GM */
@@ -101,14 +134,13 @@ unittester_read(uint16_t port, UNUSED(void *priv))
{
if (port == unittester.iobase_port+0x00) {
/* Status port */
/* TODO! --GM */
unittester_log("[UT] R -- Status\n");
return 0x04;
unittester_log("[UT] R -- Status = %02X\n", unittester.status);
return unittester.status;
} else if (port == unittester.iobase_port+0x01) {
/* Data port */
/* TODO! --GM */
unittester_log("[UT] R -- Data\n");
return 0xFE;
/* TODO! --GM */
return 0xFF;
} else {
/* Not handled here - possibly open bus! */
return 0xFF;