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Indicate which signals in GPIOGET have changed since the last call

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Signed-off-by: Randall Spangler <rspangler@chromium.org>

BUG=none
TEST=at EC console, gpioget twice, then toggle an output using gpioset, then gpioget again

May see *'s the first time.  Second time, should see no *'s.  Third
time, should see a * only the toggled output (and any input signals
which respond to it).

Change-Id: Ibc1870839201008592b7982049cc352c1779a0e3
This commit is contained in:
Randall Spangler
2012-01-25 11:31:57 -08:00
parent 959c38da68
commit 59d55ece06
1 changed files with 29 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

33
chip/lm4/gpio.c
View File

@@ -280,10 +280,27 @@ DECLARE_IRQ(LM4_IRQ_GPIOQ, __gpio_q_interrupt, 1);
/*****************************************************************************/
/* Console commands */
static uint8_t last_val[(GPIO_COUNT + 7) / 8];
/* If v is different from the last value for index i, updates the last value
* and returns 1; else returns 0. */
static int last_val_changed(int i, int v)
{
if (v && !(last_val[i / 8] & (1 << (i % 8)))) {
last_val[i / 8] |= 1 << (i % 8);
return 1;
} else if (!v && last_val[i / 8] & (1 << (i % 8))) {
last_val[i / 8] &= ~(1 << (i % 8));
return 1;
} else {
return 0;
}
}
static int command_gpio_get(int argc, char **argv)
{
const struct gpio_info *g = gpio_list;
int i;
int changed, v, i;
/* If a signal is specified, print only that one */
if (argc == 2) {
@@ -293,15 +310,23 @@ static int command_gpio_get(int argc, char **argv)
return EC_ERROR_UNKNOWN;
}
g = gpio_list + i;
uart_printf(" %d %s\n", gpio_get_level(i), g->name);
v = gpio_get_level(i);
changed = last_val_changed(i, v);
uart_printf(" %d%c %s\n", v, (changed ? '*' : ' '), g->name);
return EC_SUCCESS;
}
/* Otherwise print them all */
uart_puts("Current GPIO levels:\n");
for (i = 0; i < GPIO_COUNT; i++, g++) {
if (g->mask)
uart_printf(" %d %s\n", gpio_get_level(i), g->name);
if (!g->mask)
continue; /* Skip unsupported signals */
v = gpio_get_level(i);
changed = last_val_changed(i, v);
uart_printf(" %d%c %s\n", v, (changed ? '*' : ' '), g->name);
/* We have enough GPIOs that we'll overflow the output buffer
* without flushing */
uart_flush_output();