Cons-n-Stuff/iidx_pico
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Turntable noise filtering and debouncing

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This commit is contained in:
whowe 2024-06-08 10:46:03 +08:00
parent 671bb98cb2
commit 87c7251701
4 changed files with 39 additions and 8 deletions
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1
.gitignore vendored
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@ -3,3 +3,4 @@ PCB/Turntable/iidx_tt-backups/
PCB/Keyboard/iidx_pico-backups/
Production/PCB/Turntable
Production/PCB/Keyboard
build

BIN
Production/Firmware/iidx_pico.uf2
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Binary file not shown.

4
firmware/src/main.c
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@ -92,7 +92,7 @@ static void core1_loop()
static void core0_loop()
{
uint64_t next_frame = 0;
absolute_time_t next_frame = {0};
while (true)
{
@ -114,7 +114,7 @@ static void core0_loop()
cli_fps_count(0);
sleep_until(next_frame);
next_frame = time_us_64() + 1000; // 1KHz
next_frame = make_timeout_time_us(1000);
}
}

42
firmware/src/turntable.c
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@ -22,7 +22,7 @@ static uint16_t angle = 0;
static void init_i2c()
{
i2c_init(TT_AS5600_I2C, 573 * 1000);
i2c_init(TT_AS5600_I2C, 400 * 1000);
gpio_set_function(TT_AS5600_SCL, GPIO_FUNC_I2C);
gpio_set_function(TT_AS5600_SDA, GPIO_FUNC_I2C);
gpio_set_drive_strength(TT_AS5600_SCL, GPIO_DRIVE_STRENGTH_8MA);
@ -36,16 +36,46 @@ void turntable_init()
init_i2c();
}
void turntable_update()
static int read_angle()
{
const uint8_t as5600_addr = 0x36;
uint8_t buf[2] = {0x0c, 0x00};
i2c_write_blocking_until(TT_AS5600_I2C, as5600_addr, buf, 1, true,
int ret = i2c_write_blocking_until(TT_AS5600_I2C, as5600_addr, buf, 1, true,
make_timeout_time_ms(1));
i2c_read_blocking_until(TT_AS5600_I2C, as5600_addr, buf, 2, false,
make_timeout_time_ms(1));
if (ret != 1) {
return -1;
}
angle = ((uint16_t)buf[0] & 0x0f) << 8 | buf[1];
ret = i2c_read_blocking_until(TT_AS5600_I2C, as5600_addr, buf, 2, false,
make_timeout_time_ms(1));
if (ret != 2) {
return -1;
}
return (buf[0] & 0x0f) << 8 | buf[1];
}
void turntable_update()
{
int candidate = read_angle();
if (candidate < 0) {
return;
}
for (int i = 0; i < 2; i++) {
int update = read_angle();
if (abs(update - candidate) > 2) {
return;
}
if (update > candidate) {
candidate++;
} else if (update < candidate) {
candidate--;
}
}
angle = candidate;
}
uint16_t turntable_raw()