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| author | Kevin O'Connor <kevin@koconnor.net> | 2018-01-29 11:54:15 -0500 |
|---|---|---|
| committer | Kevin O'Connor <kevin@koconnor.net> | 2018-01-29 11:54:15 -0500 |
| commit | b7b216af7f49995f816f326c08f721b3814c9685 (patch) | |
| tree | bc18ae8c74af3c51882d8ec019dc1b420f32a7a4 | |
| parent | 077a56c2ca0315957efa8969221b850ed34c2cf7 (diff) | |
| download | kutter-b7b216af7f49995f816f326c08f721b3814c9685.tar.gz kutter-b7b216af7f49995f816f326c08f721b3814c9685.tar.xz kutter-b7b216af7f49995f816f326c08f721b3814c9685.zip | |
avr: Round hardware pwm clock ticks to nearest divisor
Instead of rounding down to the nearest supported pwm divisor, round
to the nearest divisor.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
| -rw-r--r-- | src/avr/gpio.c | 24 |
1 files changed, 12 insertions, 12 deletions
diff --git a/src/avr/gpio.c b/src/avr/gpio.c index ec782501..774885e4 100644 --- a/src/avr/gpio.c +++ b/src/avr/gpio.c @@ -186,21 +186,21 @@ gpio_pwm_setup(uint8_t pin, uint32_t cycle_time, uint8_t val) uint8_t flags = READP(p->flags), cs; if (flags & GP_AFMT) { switch (cycle_time) { - case 0 ... 8*510L - 1: cs = 1; break; - case 8*510L ... 32*510L - 1: cs = 2; break; - case 32*510L ... 64*510L - 1: cs = 3; break; - case 64*510L ... 128*510L - 1: cs = 4; break; - case 128*510L ... 256*510L - 1: cs = 5; break; - case 256*510L ... 1024*510L - 1: cs = 6; break; - default: cs = 7; break; + case 0 ... (1+8) * 510L / 2 - 1: cs = 1; break; + case (1+8) * 510L / 2 ... (8+32) * 510L / 2 - 1: cs = 2; break; + case (8+32) * 510L / 2 ... (32+64) * 510L / 2 - 1: cs = 3; break; + case (32+64) * 510L / 2 ... (64+128) * 510L / 2 - 1: cs = 4; break; + case (64+128) * 510L / 2 ... (128+256) * 510L / 2 - 1: cs = 5; break; + case (128+256) * 510L / 2 ... (256+1024) * 510L / 2 - 1: cs = 6; break; + default: cs = 7; break; } } else { switch (cycle_time) { - case 0 ... 8*510L - 1: cs = 1; break; - case 8*510L ... 64*510L - 1: cs = 2; break; - case 64*510L ... 256*510L - 1: cs = 3; break; - case 256*510L ... 1024*510L - 1: cs = 4; break; - default: cs = 5; break; + case 0 ... (1+8) * 510L / 2 - 1: cs = 1; break; + case (1+8) * 510L / 2 ... (8+64) * 510L / 2 - 1: cs = 2; break; + case (8+64) * 510L / 2 ... (64+256) * 510L / 2 - 1: cs = 3; break; + case (64+256) * 510L / 2 ... (256+1024) * 510L / 2 - 1: cs = 4; break; + default: cs = 5; break; } } volatile uint8_t *rega = READP(p->rega), *regb = READP(p->regb); |