nrf: add PWM
This commit is contained in:
Dario Nieuwenhuis
parent
0310e4d458
commit
f9bcf6df6b
104
embassy-nrf-examples/src/bin/pwm.rs
Normal file
104
embassy-nrf-examples/src/bin/pwm.rs
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@ -0,0 +1,104 @@
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#![no_std]
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#![no_main]
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#![feature(min_type_alias_impl_trait)]
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#![feature(impl_trait_in_bindings)]
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#![feature(type_alias_impl_trait)]
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#![allow(incomplete_features)]
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#[path = "../example_common.rs"]
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mod example_common;
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use defmt::{panic, *};
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use embassy::executor::Spawner;
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use embassy::time::{Duration, Timer};
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use embassy_nrf::pwm::{Prescaler, Pwm};
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use embassy_nrf::{interrupt, Peripherals};
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// for i in range(1024): print(int((math.sin(i/512*math.pi)*0.4+0.5)**2*32767), ', ', end='')
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static DUTY: [u16; 1024] = [
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8191, 8272, 8353, 8434, 8516, 8598, 8681, 8764, 8847, 8931, 9015, 9099, 9184, 9269, 9354, 9440,
|
||||
9526, 9613, 9700, 9787, 9874, 9962, 10050, 10139, 10227, 10316, 10406, 10495, 10585, 10675,
|
||||
10766, 10857, 10948, 11039, 11131, 11223, 11315, 11407, 11500, 11592, 11685, 11779, 11872,
|
||||
11966, 12060, 12154, 12248, 12343, 12438, 12533, 12628, 12723, 12818, 12914, 13010, 13106,
|
||||
13202, 13298, 13394, 13491, 13587, 13684, 13781, 13878, 13975, 14072, 14169, 14266, 14364,
|
||||
14461, 14558, 14656, 14754, 14851, 14949, 15046, 15144, 15242, 15339, 15437, 15535, 15632,
|
||||
15730, 15828, 15925, 16023, 16120, 16218, 16315, 16412, 16510, 16607, 16704, 16801, 16898,
|
||||
16995, 17091, 17188, 17284, 17380, 17477, 17572, 17668, 17764, 17859, 17955, 18050, 18145,
|
||||
18239, 18334, 18428, 18522, 18616, 18710, 18803, 18896, 18989, 19082, 19174, 19266, 19358,
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||||
19449, 19540, 19631, 19722, 19812, 19902, 19991, 20081, 20169, 20258, 20346, 20434, 20521,
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||||
20608, 20695, 20781, 20867, 20952, 21037, 21122, 21206, 21290, 21373, 21456, 21538, 21620,
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21701, 21782, 21863, 21943, 22022, 22101, 22179, 22257, 22335, 22412, 22488, 22564, 22639,
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22714, 22788, 22861, 22934, 23007, 23079, 23150, 23220, 23290, 23360, 23429, 23497, 23564,
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||||
23631, 23698, 23763, 23828, 23892, 23956, 24019, 24081, 24143, 24204, 24264, 24324, 24383,
|
||||
24441, 24499, 24555, 24611, 24667, 24721, 24775, 24828, 24881, 24933, 24983, 25034, 25083,
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25132, 25180, 25227, 25273, 25319, 25363, 25407, 25451, 25493, 25535, 25575, 25615, 25655,
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25693, 25731, 25767, 25803, 25838, 25873, 25906, 25939, 25971, 26002, 26032, 26061, 26089,
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26117, 26144, 26170, 26195, 26219, 26242, 26264, 26286, 26307, 26327, 26346, 26364, 26381,
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||||
26397, 26413, 26427, 26441, 26454, 26466, 26477, 26487, 26496, 26505, 26512, 26519, 26525,
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26530, 26534, 26537, 26539, 26540, 26541, 26540, 26539, 26537, 26534, 26530, 26525, 26519,
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26512, 26505, 26496, 26487, 26477, 26466, 26454, 26441, 26427, 26413, 26397, 26381, 26364,
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26346, 26327, 26307, 26286, 26264, 26242, 26219, 26195, 26170, 26144, 26117, 26089, 26061,
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26032, 26002, 25971, 25939, 25906, 25873, 25838, 25803, 25767, 25731, 25693, 25655, 25615,
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25575, 25535, 25493, 25451, 25407, 25363, 25319, 25273, 25227, 25180, 25132, 25083, 25034,
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24983, 24933, 24881, 24828, 24775, 24721, 24667, 24611, 24555, 24499, 24441, 24383, 24324,
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24264, 24204, 24143, 24081, 24019, 23956, 23892, 23828, 23763, 23698, 23631, 23564, 23497,
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23429, 23360, 23290, 23220, 23150, 23079, 23007, 22934, 22861, 22788, 22714, 22639, 22564,
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22488, 22412, 22335, 22257, 22179, 22101, 22022, 21943, 21863, 21782, 21701, 21620, 21538,
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21456, 21373, 21290, 21206, 21122, 21037, 20952, 20867, 20781, 20695, 20608, 20521, 20434,
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20346, 20258, 20169, 20081, 19991, 19902, 19812, 19722, 19631, 19540, 19449, 19358, 19266,
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19174, 19082, 18989, 18896, 18803, 18710, 18616, 18522, 18428, 18334, 18239, 18145, 18050,
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17955, 17859, 17764, 17668, 17572, 17477, 17380, 17284, 17188, 17091, 16995, 16898, 16801,
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16704, 16607, 16510, 16412, 16315, 16218, 16120, 16023, 15925, 15828, 15730, 15632, 15535,
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15437, 15339, 15242, 15144, 15046, 14949, 14851, 14754, 14656, 14558, 14461, 14364, 14266,
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14169, 14072, 13975, 13878, 13781, 13684, 13587, 13491, 13394, 13298, 13202, 13106, 13010,
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12914, 12818, 12723, 12628, 12533, 12438, 12343, 12248, 12154, 12060, 11966, 11872, 11779,
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11685, 11592, 11500, 11407, 11315, 11223, 11131, 11039, 10948, 10857, 10766, 10675, 10585,
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10495, 10406, 10316, 10227, 10139, 10050, 9962, 9874, 9787, 9700, 9613, 9526, 9440, 9354, 9269,
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9184, 9099, 9015, 8931, 8847, 8764, 8681, 8598, 8516, 8434, 8353, 8272, 8191, 8111, 8031, 7952,
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7873, 7794, 7716, 7638, 7561, 7484, 7407, 7331, 7255, 7180, 7105, 7031, 6957, 6883, 6810, 6738,
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6665, 6594, 6522, 6451, 6381, 6311, 6241, 6172, 6104, 6036, 5968, 5901, 5834, 5767, 5702, 5636,
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5571, 5507, 5443, 5379, 5316, 5253, 5191, 5130, 5068, 5008, 4947, 4888, 4828, 4769, 4711, 4653,
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4596, 4539, 4482, 4426, 4371, 4316, 4261, 4207, 4153, 4100, 4047, 3995, 3943, 3892, 3841, 3791,
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3741, 3691, 3642, 3594, 3546, 3498, 3451, 3404, 3358, 3312, 3267, 3222, 3178, 3134, 3090, 3047,
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3005, 2962, 2921, 2879, 2839, 2798, 2758, 2719, 2680, 2641, 2603, 2565, 2528, 2491, 2454, 2418,
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2382, 2347, 2312, 2278, 2244, 2210, 2177, 2144, 2112, 2080, 2048, 2017, 1986, 1956, 1926, 1896,
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1867, 1838, 1810, 1781, 1754, 1726, 1699, 1673, 1646, 1620, 1595, 1570, 1545, 1520, 1496, 1472,
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1449, 1426, 1403, 1380, 1358, 1336, 1315, 1294, 1273, 1252, 1232, 1212, 1192, 1173, 1154, 1135,
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1117, 1099, 1081, 1063, 1046, 1029, 1012, 996, 980, 964, 948, 933, 918, 903, 888, 874, 860,
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846, 833, 819, 806, 793, 781, 768, 756, 744, 733, 721, 710, 699, 688, 677, 667, 657, 647, 637,
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627, 618, 609, 599, 591, 582, 574, 565, 557, 549, 541, 534, 526, 519, 512, 505, 498, 492, 485,
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479, 473, 467, 461, 455, 450, 444, 439, 434, 429, 424, 419, 415, 410, 406, 402, 398, 394, 390,
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386, 383, 379, 376, 373, 370, 367, 364, 361, 359, 356, 354, 351, 349, 347, 345, 343, 342, 340,
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338, 337, 336, 334, 333, 332, 331, 330, 330, 329, 328, 328, 328, 327, 327, 327, 327, 327, 328,
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328, 328, 329, 330, 330, 331, 332, 333, 334, 336, 337, 338, 340, 342, 343, 345, 347, 349, 351,
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354, 356, 359, 361, 364, 367, 370, 373, 376, 379, 383, 386, 390, 394, 398, 402, 406, 410, 415,
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419, 424, 429, 434, 439, 444, 450, 455, 461, 467, 473, 479, 485, 492, 498, 505, 512, 519, 526,
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534, 541, 549, 557, 565, 574, 582, 591, 599, 609, 618, 627, 637, 647, 657, 667, 677, 688, 699,
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710, 721, 733, 744, 756, 768, 781, 793, 806, 819, 833, 846, 860, 874, 888, 903, 918, 933, 948,
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964, 980, 996, 1012, 1029, 1046, 1063, 1081, 1099, 1117, 1135, 1154, 1173, 1192, 1212, 1232,
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1252, 1273, 1294, 1315, 1336, 1358, 1380, 1403, 1426, 1449, 1472, 1496, 1520, 1545, 1570, 1595,
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1620, 1646, 1673, 1699, 1726, 1754, 1781, 1810, 1838, 1867, 1896, 1926, 1956, 1986, 2017, 2048,
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2080, 2112, 2144, 2177, 2210, 2244, 2278, 2312, 2347, 2382, 2418, 2454, 2491, 2528, 2565, 2603,
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2641, 2680, 2719, 2758, 2798, 2839, 2879, 2921, 2962, 3005, 3047, 3090, 3134, 3178, 3222, 3267,
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3312, 3358, 3404, 3451, 3498, 3546, 3594, 3642, 3691, 3741, 3791, 3841, 3892, 3943, 3995, 4047,
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4100, 4153, 4207, 4261, 4316, 4371, 4426, 4482, 4539, 4596, 4653, 4711, 4769, 4828, 4888, 4947,
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5008, 5068, 5130, 5191, 5253, 5316, 5379, 5443, 5507, 5571, 5636, 5702, 5767, 5834, 5901, 5968,
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6036, 6104, 6172, 6241, 6311, 6381, 6451, 6522, 6594, 6665, 6738, 6810, 6883, 6957, 7031, 7105,
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7180, 7255, 7331, 7407, 7484, 7561, 7638, 7716, 7794, 7873, 7952, 8031, 8111,
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];
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#[embassy::main]
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async fn main(spawner: Spawner, p: Peripherals) {
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let pwm = Pwm::new(p.PWM0, p.P0_13, p.P0_14, p.P0_16, p.P0_15);
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pwm.set_prescaler(Prescaler::Div1);
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info!("pwm initialized!");
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let mut i = 0;
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loop {
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i += 1;
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pwm.set_duty(0, DUTY[i % 1024]);
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pwm.set_duty(1, DUTY[(i + 256) % 1024]);
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pwm.set_duty(2, DUTY[(i + 512) % 1024]);
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pwm.set_duty(3, DUTY[(i + 768) % 1024]);
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Timer::after(Duration::from_millis(3)).await;
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}
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}
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@ -18,6 +18,9 @@ embassy_extras::peripherals! {
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// SAADC
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SAADC,
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// PWM
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PWM0,
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// TIMER
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TIMER0,
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TIMER1,
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@ -115,6 +118,8 @@ impl_spim!(SPI0, SPIM0, SPIM0_SPIS0_SPI0);
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impl_twim!(TWI0, TWIM0, TWIM0_TWIS0_TWI0);
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impl_pwm!(PWM0, PWM0, PWM0);
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impl_timer!(TIMER0, TIMER0, TIMER0);
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impl_timer!(TIMER1, TIMER1, TIMER1);
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impl_timer!(TIMER2, TIMER2, TIMER2);
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@ -18,6 +18,9 @@ embassy_extras::peripherals! {
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// SAADC
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SAADC,
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// PWM
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PWM0,
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// TIMER
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TIMER0,
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TIMER1,
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@ -116,6 +119,8 @@ impl_spim!(SPI1, SPIM1, SPIM1_SPIS1_SPI1);
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impl_twim!(TWISPI0, TWIM0, TWIM0_TWIS0_TWI0_SPIM0_SPIS0_SPI0);
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impl_pwm!(PWM0, PWM0, PWM0);
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impl_timer!(TIMER0, TIMER0, TIMER0);
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impl_timer!(TIMER1, TIMER1, TIMER1);
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impl_timer!(TIMER2, TIMER2, TIMER2);
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@ -21,6 +21,11 @@ embassy_extras::peripherals! {
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// SAADC
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SAADC,
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// PWM
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PWM0,
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PWM1,
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PWM2,
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// TIMER
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TIMER0,
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TIMER1,
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@ -123,6 +128,10 @@ impl_spim!(SPI2, SPIM2, SPIM2_SPIS2_SPI2);
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impl_twim!(TWISPI0, TWIM0, SPIM0_SPIS0_TWIM0_TWIS0_SPI0_TWI0);
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impl_twim!(TWISPI1, TWIM1, SPIM1_SPIS1_TWIM1_TWIS1_SPI1_TWI1);
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impl_pwm!(PWM0, PWM0, PWM0);
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impl_pwm!(PWM1, PWM1, PWM1);
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impl_pwm!(PWM2, PWM2, PWM2);
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impl_timer!(TIMER0, TIMER0, TIMER0);
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impl_timer!(TIMER1, TIMER1, TIMER1);
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impl_timer!(TIMER2, TIMER2, TIMER2);
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@ -22,6 +22,12 @@ embassy_extras::peripherals! {
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// SAADC
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SAADC,
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// PWM
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PWM0,
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PWM1,
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PWM2,
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PWM3,
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// TIMER
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TIMER0,
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TIMER1,
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@ -144,6 +150,11 @@ impl_spim!(SPI3, SPIM3, SPIM3);
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impl_twim!(TWISPI0, TWIM0, SPIM0_SPIS0_TWIM0_TWIS0_SPI0_TWI0);
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impl_twim!(TWISPI1, TWIM1, SPIM1_SPIS1_TWIM1_TWIS1_SPI1_TWI1);
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impl_pwm!(PWM0, PWM0, PWM0);
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impl_pwm!(PWM1, PWM1, PWM1);
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impl_pwm!(PWM2, PWM2, PWM2);
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impl_pwm!(PWM3, PWM3, PWM3);
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impl_timer!(TIMER0, TIMER0, TIMER0);
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impl_timer!(TIMER1, TIMER1, TIMER1);
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impl_timer!(TIMER2, TIMER2, TIMER2);
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@ -25,6 +25,12 @@ embassy_extras::peripherals! {
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// SAADC
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SAADC,
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// PWM
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PWM0,
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PWM1,
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PWM2,
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PWM3,
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// TIMER
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TIMER0,
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TIMER1,
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@ -147,6 +153,11 @@ impl_spim!(SPI3, SPIM3, SPIM3);
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impl_twim!(TWISPI0, TWIM0, SPIM0_SPIS0_TWIM0_TWIS0_SPI0_TWI0);
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impl_twim!(TWISPI1, TWIM1, SPIM1_SPIS1_TWIM1_TWIS1_SPI1_TWI1);
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impl_pwm!(PWM0, PWM0, PWM0);
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impl_pwm!(PWM1, PWM1, PWM1);
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impl_pwm!(PWM2, PWM2, PWM2);
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impl_pwm!(PWM3, PWM3, PWM3);
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impl_timer!(TIMER0, TIMER0, TIMER0);
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impl_timer!(TIMER1, TIMER1, TIMER1);
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impl_timer!(TIMER2, TIMER2, TIMER2);
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@ -29,6 +29,8 @@ pub mod buffered_uarte;
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pub mod gpio;
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pub mod gpiote;
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pub mod ppi;
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#[cfg(not(any(feature = "nrf52805", feature = "nrf52820")))]
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pub mod pwm;
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#[cfg(feature = "nrf52840")]
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pub mod qspi;
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pub mod rtc;
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219
embassy-nrf/src/pwm.rs
Normal file
219
embassy-nrf/src/pwm.rs
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@ -0,0 +1,219 @@
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#![macro_use]
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use core::cell::UnsafeCell;
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use core::marker::PhantomData;
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use core::sync::atomic::{compiler_fence, Ordering};
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use embassy::util::Unborrow;
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use embassy_extras::unborrow;
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use crate::fmt::{assert, panic, unreachable, *};
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use crate::gpio::sealed::Pin as _;
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use crate::gpio::OptionalPin as GpioOptionalPin;
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use crate::interrupt::Interrupt;
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use crate::pac;
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#[derive(Debug, Eq, PartialEq, Clone, Copy)]
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pub enum Prescaler {
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Div1,
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Div2,
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Div4,
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Div8,
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Div16,
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Div32,
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Div64,
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Div128,
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}
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/// Interface to the UARTE peripheral
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pub struct Pwm<'d, T: Instance> {
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peri: T,
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phantom: PhantomData<&'d mut T>,
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}
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impl<'d, T: Instance> Pwm<'d, T> {
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/// Creates the interface to a UARTE instance.
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/// Sets the baud rate, parity and assigns the pins to the UARTE peripheral.
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///
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/// # Safety
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///
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/// The returned API is safe unless you use `mem::forget` (or similar safe mechanisms)
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/// on stack allocated buffers which which have been passed to [`send()`](Pwm::send)
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/// or [`receive`](Pwm::receive).
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#[allow(unused_unsafe)]
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pub fn new(
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pwm: impl Unborrow<Target = T> + 'd,
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ch0: impl Unborrow<Target = impl GpioOptionalPin> + 'd,
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ch1: impl Unborrow<Target = impl GpioOptionalPin> + 'd,
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ch2: impl Unborrow<Target = impl GpioOptionalPin> + 'd,
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ch3: impl Unborrow<Target = impl GpioOptionalPin> + 'd,
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) -> Self {
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unborrow!(pwm, ch0, ch1, ch2, ch3);
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let r = T::regs();
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let s = T::state();
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if let Some(pin) = ch0.pin_mut() {
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pin.set_high();
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pin.conf().write(|w| w.dir().output());
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}
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if let Some(pin) = ch1.pin_mut() {
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pin.set_high();
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pin.conf().write(|w| w.dir().output());
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}
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if let Some(pin) = ch2.pin_mut() {
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pin.set_high();
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pin.conf().write(|w| w.dir().output());
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}
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if let Some(pin) = ch3.pin_mut() {
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pin.set_high();
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pin.conf().write(|w| w.dir().output());
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}
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r.psel.out[0].write(|w| unsafe { w.bits(ch0.psel_bits()) });
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r.psel.out[1].write(|w| unsafe { w.bits(ch1.psel_bits()) });
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r.psel.out[2].write(|w| unsafe { w.bits(ch2.psel_bits()) });
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r.psel.out[3].write(|w| unsafe { w.bits(ch3.psel_bits()) });
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// Disable all interrupts
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r.intenclr.write(|w| unsafe { w.bits(0xFFFF_FFFF) });
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// Enable
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r.enable.write(|w| w.enable().enabled());
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||||
|
||||
r.seq0
|
||||
.ptr
|
||||
.write(|w| unsafe { w.bits(&s.duty as *const _ as u32) });
|
||||
r.seq0.cnt.write(|w| unsafe { w.bits(4) });
|
||||
r.seq0.refresh.write(|w| unsafe { w.bits(32) });
|
||||
r.seq0.enddelay.write(|w| unsafe { w.bits(0) });
|
||||
|
||||
r.decoder.write(|w| {
|
||||
w.load().individual();
|
||||
w.mode().refresh_count()
|
||||
});
|
||||
r.mode.write(|w| w.updown().up());
|
||||
r.prescaler.write(|w| w.prescaler().div_1());
|
||||
r.countertop
|
||||
.write(|w| unsafe { w.countertop().bits(32767) });
|
||||
r.loop_.write(|w| w.cnt().disabled());
|
||||
|
||||
Self {
|
||||
peri: pwm,
|
||||
phantom: PhantomData,
|
||||
}
|
||||
}
|
||||
|
||||
/// Sets duty cycle (15 bit) for a PWM channel.
|
||||
pub fn set_duty(&self, channel: usize, duty: u16) {
|
||||
let s = T::state();
|
||||
unsafe { (*s.duty.get())[channel] = duty & 0x7FFF };
|
||||
|
||||
compiler_fence(Ordering::SeqCst);
|
||||
T::regs().tasks_seqstart[0].write(|w| unsafe { w.bits(1) });
|
||||
}
|
||||
|
||||
/// Sets the PWM clock prescaler.
|
||||
#[inline(always)]
|
||||
pub fn set_prescaler(&self, div: Prescaler) {
|
||||
T::regs().prescaler.write(|w| w.prescaler().bits(div as u8));
|
||||
}
|
||||
|
||||
/// Sets the PWM clock prescaler.
|
||||
#[inline(always)]
|
||||
pub fn prescaler(&self) -> Prescaler {
|
||||
match T::regs().prescaler.read().prescaler().bits() {
|
||||
0 => Prescaler::Div1,
|
||||
1 => Prescaler::Div2,
|
||||
2 => Prescaler::Div4,
|
||||
3 => Prescaler::Div8,
|
||||
4 => Prescaler::Div16,
|
||||
5 => Prescaler::Div32,
|
||||
6 => Prescaler::Div64,
|
||||
7 => Prescaler::Div128,
|
||||
_ => unreachable!(),
|
||||
}
|
||||
}
|
||||
|
||||
/// Sets the maximum duty cycle value.
|
||||
#[inline(always)]
|
||||
pub fn set_max_duty(&self, duty: u16) {
|
||||
T::regs()
|
||||
.countertop
|
||||
.write(|w| unsafe { w.countertop().bits(duty.min(32767u16)) });
|
||||
}
|
||||
|
||||
/// Returns the maximum duty cycle value.
|
||||
#[inline(always)]
|
||||
pub fn max_duty(&self) -> u16 {
|
||||
T::regs().countertop.read().countertop().bits()
|
||||
}
|
||||
|
||||
/// Sets the PWM output frequency.
|
||||
#[inline(always)]
|
||||
pub fn set_period(&self, freq: u32) {
|
||||
let clk = 16_000_000u32 >> (self.prescaler() as u8);
|
||||
let duty = clk / freq;
|
||||
self.set_max_duty(duty.min(32767) as u16);
|
||||
}
|
||||
|
||||
/// Returns the PWM output frequency.
|
||||
#[inline(always)]
|
||||
pub fn period(&self) -> u32 {
|
||||
let clk = 16_000_000u32 >> (self.prescaler() as u8);
|
||||
let max_duty = self.max_duty() as u32;
|
||||
clk / max_duty
|
||||
}
|
||||
}
|
||||
|
||||
impl<'a, T: Instance> Drop for Pwm<'a, T> {
|
||||
fn drop(&mut self) {
|
||||
let r = T::regs();
|
||||
r.enable.write(|w| w.enable().disabled());
|
||||
|
||||
info!("pwm drop: done");
|
||||
|
||||
// TODO: disable pins
|
||||
}
|
||||
}
|
||||
|
||||
pub(crate) mod sealed {
|
||||
use super::*;
|
||||
|
||||
pub struct State {
|
||||
pub duty: UnsafeCell<[u16; 4]>,
|
||||
}
|
||||
unsafe impl Sync for State {}
|
||||
|
||||
impl State {
|
||||
pub const fn new() -> Self {
|
||||
Self {
|
||||
duty: UnsafeCell::new([0; 4]),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
pub trait Instance {
|
||||
fn regs() -> &'static pac::pwm0::RegisterBlock;
|
||||
fn state() -> &'static State;
|
||||
}
|
||||
}
|
||||
|
||||
pub trait Instance: sealed::Instance + 'static {
|
||||
type Interrupt: Interrupt;
|
||||
}
|
||||
|
||||
macro_rules! impl_pwm {
|
||||
($type:ident, $pac_type:ident, $irq:ident) => {
|
||||
impl crate::pwm::sealed::Instance for peripherals::$type {
|
||||
fn regs() -> &'static pac::pwm0::RegisterBlock {
|
||||
unsafe { &*pac::$pac_type::ptr() }
|
||||
}
|
||||
fn state() -> &'static crate::pwm::sealed::State {
|
||||
static STATE: crate::pwm::sealed::State = crate::pwm::sealed::State::new();
|
||||
&STATE
|
||||
}
|
||||
}
|
||||
impl crate::pwm::Instance for peripherals::$type {
|
||||
type Interrupt = crate::interrupt::$irq;
|
||||
}
|
||||
};
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user