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it is working up to ~30.5M freq. so far no tight tests though.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,143 @@ | ||
| /////////////////////////////////////////////////////////////////////////////// | ||
| // | ||
| // Roman Piksaykin [[email protected]], R2BDY | ||
| // https://www.qrz.com/db/r2bdy | ||
| // | ||
| /////////////////////////////////////////////////////////////////////////////// | ||
| // | ||
| // | ||
| // dco2.pio Digital controlled radio freq oscillator based on PIO. | ||
| // | ||
| // | ||
| // DESCRIPTION | ||
| // - | ||
| // | ||
| // PLATFORM | ||
| // Raspberry Pi pico. | ||
| // | ||
| // REVISION HISTORY | ||
| // | ||
| // Rev 2.0 09 Dec 2023 | ||
| // New algo devising. | ||
| // | ||
| // LICENCE | ||
| // MIT License (http://www.opensource.org/licenses/mit-license.php) | ||
| // | ||
| // Copyright (c) 2023 by Roman Piksaykin | ||
| // | ||
| // Permission is hereby granted, free of charge,to any person obtaining a copy | ||
| // of this software and associated documentation files (the Software), to deal | ||
| // in the Software without restriction,including without limitation the rights | ||
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| // copies of the Software, and to permit persons to whom the Software is | ||
| // furnished to do so, subject to the following conditions: | ||
| // | ||
| // The above copyright notice and this permission notice shall be included in | ||
| // all copies or substantial portions of the Software. | ||
| // | ||
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| // LIABILITY,WHETHER IN AN ACTION OF CONTRACT,TORT OR OTHERWISE, ARISING FROM, | ||
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | ||
| // THE SOFTWARE. | ||
| /////////////////////////////////////////////////////////////////////////////// | ||
| .program dco | ||
|
|
||
| .wrap_target | ||
| out y, 32 | ||
| mov x, y | ||
| LOOP0: | ||
| jmp x-- LOOP0 | ||
| set pins, 1 | ||
|
|
||
| mov x, y [1] | ||
| LOOP1: | ||
| jmp x-- LOOP1 | ||
| set pins, 0 | ||
|
|
||
| mov x, y [1] | ||
| LOOP2: | ||
| jmp x-- LOOP2 | ||
| set pins, 1 | ||
|
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||
| mov x, y [1] | ||
| LOOP3: | ||
| jmp x-- LOOP3 | ||
| set pins, 0 | ||
| .wrap | ||
|
|
||
| /* | ||
| // it is OK for ~20.5M | ||
| .wrap_target | ||
| out y, 32 | ||
| mov x, y | ||
| LOOP0: | ||
| jmp x-- LOOP0 | ||
| set pins, 1 | ||
|
|
||
| mov x, y [1] | ||
| LOOP1: | ||
| jmp x-- LOOP1 | ||
| set pins, 0 | ||
| .wrap | ||
| */ | ||
| /* | ||
| .wrap_target | ||
| // CYCLES COUNT | ||
| out y, 8 // 1. | ||
| LOOP0: | ||
| jmp y-- LOOP0 // 2 + y0. | ||
| set pins, 1 // 1 * PI 3 + y0. | ||
|
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||
| out y, 8 // 4 + y0. | ||
| LOOP1: | ||
| jmp y-- LOOP1 // 5 + y0 + y1. | ||
| set pins, 0 // 2 * PI 6 + y0 + y1. | ||
| // 6 cycles min.=> 270MHz / 6 = 45MHz (VHF low-band). | ||
| // 3rd harmonic is 135M. | ||
| // 5th is 225M. | ||
| // 7th is 315M. | ||
| .wrap | ||
| */ | ||
|
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||
| % c-sdk { | ||
|
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| #define PIOASM_DELAY_CYCLES 4 | ||
|
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||
| static inline void dco_program_init(PIO pio, uint sm, uint offset, uint pin) | ||
| { | ||
| pio_sm_config c = dco_program_get_default_config(offset); | ||
|
|
||
| sm_config_set_out_shift(&c, true, true, 32); // Autopull. | ||
| sm_config_set_fifo_join(&c, PIO_FIFO_JOIN_TX); | ||
|
|
||
| sm_config_set_out_pins(&c, pin, 1); | ||
| pio_gpio_init(pio, pin); | ||
|
|
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| pio_sm_set_consecutive_pindirs(pio, sm, pin, 1, true); | ||
|
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| sm_config_set_clkdiv_int_frac(&c, 1u, 0u); | ||
|
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| pio_sm_init(pio, sm, offset, &c); | ||
| pio_sm_set_enabled(pio, sm, true); | ||
| } | ||
| // | ||
| static inline void dco_program_puts(PIO pio, uint sm, const uint32_t *s) | ||
| { | ||
| pio_sm_put_blocking(pio, sm, s[0]); | ||
| pio_sm_put_blocking(pio, sm, s[1]); | ||
| pio_sm_put_blocking(pio, sm, s[2]); | ||
| pio_sm_put_blocking(pio, sm, s[3]); | ||
| pio_sm_put_blocking(pio, sm, s[4]); | ||
| pio_sm_put_blocking(pio, sm, s[5]); | ||
| pio_sm_put_blocking(pio, sm, s[6]); | ||
| pio_sm_put_blocking(pio, sm, s[7]); | ||
| } | ||
|
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||
| static inline void dco_program_puts1w(PIO pio, uint sm, const uint32_t val) | ||
| { | ||
| pio_sm_put_blocking(pio, sm, val); | ||
| } | ||
| %} |
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