79 lines
2.6 KiB
C
79 lines
2.6 KiB
C
// -------------------------------------------------- //
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// This file is autogenerated by pioasm; do not edit! //
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// -------------------------------------------------- //
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#pragma once
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#if !PICO_NO_HARDWARE
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#include "hardware/pio.h"
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#endif
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// ------- //
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// uart_tx //
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// ------- //
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#define uart_tx_wrap_target 0
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#define uart_tx_wrap 3
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static const uint16_t uart_tx_program_instructions[] = {
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// .wrap_target
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0x9fa0, // 0: pull block side 1 [7]
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0xf727, // 1: set x, 7 side 0 [7]
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0x6001, // 2: out pins, 1
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0x0642, // 3: jmp x--, 2 [6]
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// .wrap
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};
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#if !PICO_NO_HARDWARE
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static const struct pio_program uart_tx_program = {
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.instructions = uart_tx_program_instructions,
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.length = 4,
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.origin = -1,
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};
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static inline pio_sm_config uart_tx_program_get_default_config(uint offset)
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{
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pio_sm_config c = pio_get_default_sm_config();
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sm_config_set_wrap(&c, offset + uart_tx_wrap_target, offset + uart_tx_wrap);
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sm_config_set_sideset(&c, 2, true, false);
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return c;
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}
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#include "hardware/clocks.h"
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static inline void uart_tx_program_init(PIO pio, uint sm, uint offset, uint pin_tx, uint baud)
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{
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// Tell PIO to initially drive output-high on the selected pin, then map PIO
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// onto that pin with the IO muxes.
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pio_sm_set_pins_with_mask(pio, sm, 1u << pin_tx, 1u << pin_tx);
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pio_sm_set_pindirs_with_mask(pio, sm, 1u << pin_tx, 1u << pin_tx);
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pio_gpio_init(pio, pin_tx);
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pio_sm_config c = uart_tx_program_get_default_config(offset);
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// OUT shifts to right, no autopull
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sm_config_set_out_shift(&c, true, false, 32);
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// We are mapping both OUT and side-set to the same pin, because sometimes
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// we need to assert user data onto the pin (with OUT) and sometimes
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// assert constant values (start/stop bit)
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sm_config_set_out_pins(&c, pin_tx, 1);
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sm_config_set_sideset_pins(&c, pin_tx);
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// We only need TX, so get an 8-deep FIFO!
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sm_config_set_fifo_join(&c, PIO_FIFO_JOIN_TX);
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// SM transmits 1 bit per 8 execution cycles.
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float div = (float)clock_get_hz(clk_sys) / (8 * baud);
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sm_config_set_clkdiv(&c, div);
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pio_sm_init(pio, sm, offset, &c);
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pio_sm_set_enabled(pio, sm, true);
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}
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static inline void uart_tx_program_putc(PIO pio, uint sm, char c)
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{
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pio_sm_put_blocking(pio, sm, (uint32_t) c);
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}
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static inline void uart_tx_program_puts(PIO pio, uint sm, const char *s)
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{
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while (*s)
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uart_tx_program_putc(pio, sm, *s++);
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}
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#endif
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