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swdptap: Refactored swdptap_seq_in and cleaned up

This commit is contained in:
dragonmux 2022-07-16 02:36:53 +01:00 committed by Piotr Esden-Tempski
parent 92c7a11cd2
commit 6f0bdf5f32
1 changed files with 38 additions and 31 deletions
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69
src/platforms/common/swdptap.c
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@ -59,40 +59,47 @@ static void swdptap_turnaround(const swdio_status_t dir)
SWDIO_MODE_DRIVE(); SWDIO_MODE_DRIVE();
} }
static uint32_t swdptap_seq_in_swd_delay(size_t clock_cycles) __attribute__((optimize(3)));
static uint32_t swdptap_seq_in_swd_delay(size_t clock_cycles)
{
size_t index = 0;
uint32_t value = 0;
while (clock_cycles--) {
if (gpio_get(SWDIO_PORT, SWDIO_PIN))
value |= (1U << index);
gpio_set(SWCLK_PORT, SWCLK_PIN);
for (volatile int32_t cnt = swd_delay_cnt - 2; cnt > 0; cnt--)
continue;
++index;
gpio_clear(SWCLK_PORT, SWCLK_PIN);
for (volatile int32_t cnt = swd_delay_cnt - 2; cnt > 0; cnt--)
continue;
}
return value;
}
static uint32_t swdptap_seq_in_no_delay(size_t clock_cycles) __attribute__((optimize(3)));
static uint32_t swdptap_seq_in_no_delay(size_t clock_cycles)
{
size_t index = 0;
uint32_t value = 0;
while (clock_cycles--) {
if (gpio_get(SWDIO_PORT, SWDIO_PIN))
value |= (1U << index);
gpio_set(SWCLK_PORT, SWCLK_PIN);
++index;
gpio_clear(SWCLK_PORT, SWCLK_PIN);
}
return value;
}
static uint32_t swdptap_seq_in(size_t clock_cycles) static uint32_t swdptap_seq_in(size_t clock_cycles)
{ {
uint32_t index = 1;
uint32_t ret = 0;
int len = clock_cycles;
register volatile int32_t cnt;
swdptap_turnaround(SWDIO_STATUS_FLOAT); swdptap_turnaround(SWDIO_STATUS_FLOAT);
if (swd_delay_cnt) { if (swd_delay_cnt)
while (len--) { return swdptap_seq_in_swd_delay(clock_cycles);
int res; else // NOLINT(readability-else-after-return)
res = gpio_get(SWDIO_PORT, SWDIO_PIN); return swdptap_seq_in_no_delay(clock_cycles);
gpio_set(SWCLK_PORT, SWCLK_PIN);
for(cnt = swd_delay_cnt; --cnt > 0;);
ret |= (res) ? index : 0;
index <<= 1;
gpio_clear(SWCLK_PORT, SWCLK_PIN);
for(cnt = swd_delay_cnt; --cnt > 0;);
}
} else {
volatile int res;
while (len--) {
res = gpio_get(SWDIO_PORT, SWDIO_PIN);
gpio_set(SWCLK_PORT, SWCLK_PIN);
ret |= (res) ? index : 0;
index <<= 1;
gpio_clear(SWCLK_PORT, SWCLK_PIN);
}
}
#ifdef DEBUG_SWD_BITS
for (int i = 0; i < len; i++)
DEBUG("%d", (ret & (1 << i)) ? 1 : 0);
#endif
return ret;
} }
static bool swdptap_seq_in_parity(uint32_t *ret, size_t ticks) static bool swdptap_seq_in_parity(uint32_t *ret, size_t ticks)