diff options
Diffstat (limited to 'hid/pico/src/ph_ps2_phy.pio')
| -rw-r--r-- | hid/pico/src/ph_ps2_phy.pio | 83 |
1 files changed, 0 insertions, 83 deletions
diff --git a/hid/pico/src/ph_ps2_phy.pio b/hid/pico/src/ph_ps2_phy.pio deleted file mode 100644 index 19786168..00000000 --- a/hid/pico/src/ph_ps2_phy.pio +++ /dev/null @@ -1,83 +0,0 @@ -; -; Copyright (c) 2022 No0ne (https://github.com/No0ne) -; (c) 2023 Dustin Hoffman -; -; SPDX-License-Identifier: MIT -; -; Source: https://github.com/No0ne/ps2x2pico/blob/main/ps2phy.pio - -.program ph_ps2_phy -.side_set 1 opt pindirs - -restart: - set pindirs, 0 // set clock to input mode - irq clear 0 rel side 0 // clear busy flag, set data to input mode - -receivecheck: - jmp pin, sendcheck // if clock is high, see if we have data to send - irq nowait 0 rel // clock is being pulled low, set busy flag - wait 1 pin, 1 // wait for clock to be pulled high - - // we are not sending, look for a start bit (clock high, data low) - in pins, 1 // read in from data - mov x, isr // move what we read to x - mov isr, null // clear ISR - jmp !x, receive // if x is low, start the receive process - jmp restart // not receiving - -receive: - set pindirs, 1 [6] // clock low - set x, 8 // set loop counter - -receiveloop: - set pindirs, 0 [6] // clock high - in pins, 1 [4] // read a bit into ISR - set pindirs, 1 [6] // clock low - jmp x--, receiveloop [4] // iterate - set pindirs, 0 [6] // clock high - nop side 1 [6] // data low - set pindirs, 1 [7] // clock low - jmp restart [7] - -sendcheck: - jmp !osre, send // see if we have data to send - jmp receivecheck // no data to send, restart - -send: - irq nowait 0 rel // set busy flag - set x, 10 // number of bits to write out - -sendloop: - set pindirs, 0 [6] // clock set to input (high) - jmp pin, sendcontinue // if clock is high, host is still receiving data - out null, 32 // clear OSR - irq wait 4 rel // clock was low, host wants to send data, notify of failure to send data - jmp restart // and wait for restart - -sendcontinue: - out pindirs, 1 [6] // write out data - set pindirs, 1 [6] // set clock low - jmp x--, sendloop [6] - -% c-sdk { - void ph_ps2_phy_program_init(PIO pio, uint sm, uint offset, uint dat) { - pio_sm_config c = ph_ps2_phy_program_get_default_config(offset); - - u8 clk = dat + 1; - pio_gpio_init(pio, clk); - pio_gpio_init(pio, dat); - - // Use a frequency high enough to effectivly sample clock and data. - sm_config_set_clkdiv(&c, 427); // 2560 is 20 µs, 640 is 5 µs, 427 is 3.3333 µs - sm_config_set_jmp_pin(&c, clk); - sm_config_set_set_pins(&c, clk, 1); - sm_config_set_sideset_pins(&c, dat); - sm_config_set_out_pins(&c, dat, 1); - sm_config_set_out_shift(&c, true, true, 11); - sm_config_set_in_pins(&c, dat); - sm_config_set_in_shift(&c, true, true, 9); - - pio_sm_init(pio, sm, offset, &c); - pio_sm_set_enabled(pio, sm, true); - } -%}
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