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| Original file line number | Diff line number | Diff line change |
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| // Raspberry Pi Pico PIO program to output 18 bit data to a TFT | ||
| // controller via a SPI output data path. | ||
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| //"Set" set: 1 output pin, TFT_DC | ||
| // Side set: 1 output pin, TFT_SCLK | ||
| // Data set: 1 output pin, TFT_MOSI | ||
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| .program tft_io | ||
| .side_set 1 opt ; The TFT_SCLK output. | ||
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| // The C++ code switches between the 8 bits and 16 bits loops | ||
| // by waiting for the SM to be idle and setting its PC. | ||
| // | ||
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| // 8 bit transfer | ||
| public start_8: | ||
| // Pull the next 32 bit value from the TX FIFO. | ||
| pull side 0 | ||
| // Lose the top 24 bits, send 1st bit | ||
| out pins, 25 | ||
| // Now send remaining bits | ||
| jmp spi_out side 1 | ||
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| public set_addr_window: | ||
| // Loop count in x for caset, paset and ramwr | ||
| set x, 2 side 0 | ||
| pull_cmd: | ||
| // Set DC low | ||
| set pins, 0 | ||
| // Fetch and output LS byte (caset, paset or ramwr), discarding top 24 bits, set WR low | ||
| pull side 0 | ||
| out pins, 25 | ||
| nop side 1 | ||
| next_cmd_bit: | ||
| out pins, 1 side 0 | ||
| jmp !osre, next_cmd_bit side 1 | ||
| // Set DC high | ||
| set pins, 1 side 0 | ||
| // Finish if 3rd cmd byte ramwr sent (x == 0) | ||
| jmp !x, start_tx | ||
| pull | ||
| next_xy: | ||
| // send 32 bit start and end coordinates | ||
| out pins, 1 side 0 | ||
| jmp !osre, next_xy side 1 | ||
| // Loop back for next command | ||
| jmp x--, pull_cmd side 0 | ||
| // End | ||
| jmp start_tx | ||
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| public block_fill: | ||
| // Fetch colour value | ||
| pull side 0 | ||
| // Move colour to x | ||
| mov x, osr | ||
| // Fetch pixel count | ||
| pull | ||
| // Move pixel count to y | ||
| mov y, osr | ||
| next_16: | ||
| // Copy colour value back into osr | ||
| mov osr, x side 0 | ||
| // Lose the top 8 bits, send 1st bit | ||
| out pins, 9 side 0 | ||
| nop side 1 | ||
| next_bit: | ||
| // Output next remaining bits | ||
| out pins, 1 side 0 | ||
| // Set TFT_SCLK high and jump for next bit | ||
| jmp !osre, next_bit side 1 | ||
| // Decrement count and loop | ||
| jmp y--, next_16 side 0 | ||
| // Now drop back to 16 bit output | ||
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| .wrap_target | ||
| public start_tx: | ||
| // Pull the next 32 bit value from the TX FIFO. | ||
| // Send the bottom 24 bits | ||
| pull side 0 | ||
| // Drop the first 8 bits, write first bit | ||
| out pins, 9 side 0 | ||
| nop side 1 | ||
| spi_out: | ||
| // Output the remaining bits | ||
| out pins, 1 side 0 | ||
| // Set TFT_SCLK high and jump for next bit | ||
| jmp !osre, spi_out side 1 | ||
| // Return to start | ||
| .wrap |
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| @@ -0,0 +1,73 @@ | ||
| // -------------------------------------------------- // | ||
| // This file is autogenerated by pioasm; do not edit! // | ||
| // -------------------------------------------------- // | ||
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| #pragma once | ||
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| #if !PICO_NO_HARDWARE | ||
| #include "hardware/pio.h" | ||
| #endif | ||
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| // ------ // | ||
| // tft_io // | ||
| // ------ // | ||
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| #define tft_io_wrap_target 27 | ||
| #define tft_io_wrap 31 | ||
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| #define tft_io_offset_start_8 0u | ||
| #define tft_io_offset_set_addr_window 3u | ||
| #define tft_io_offset_block_fill 17u | ||
| #define tft_io_offset_start_tx 27u | ||
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| static const uint16_t tft_io_program_instructions[] = { | ||
| 0x90a0, // 0: pull block side 0 | ||
| 0x6019, // 1: out pins, 25 | ||
| 0x181e, // 2: jmp 30 side 1 | ||
| 0xf022, // 3: set x, 2 side 0 | ||
| 0xe000, // 4: set pins, 0 | ||
| 0x90a0, // 5: pull block side 0 | ||
| 0x6019, // 6: out pins, 25 | ||
| 0xb842, // 7: nop side 1 | ||
| 0x7001, // 8: out pins, 1 side 0 | ||
| 0x18e8, // 9: jmp !osre, 8 side 1 | ||
| 0xf001, // 10: set pins, 1 side 0 | ||
| 0x003b, // 11: jmp !x, 27 | ||
| 0x80a0, // 12: pull block | ||
| 0x7001, // 13: out pins, 1 side 0 | ||
| 0x18ed, // 14: jmp !osre, 13 side 1 | ||
| 0x1044, // 15: jmp x--, 4 side 0 | ||
| 0x001b, // 16: jmp 27 | ||
| 0x90a0, // 17: pull block side 0 | ||
| 0xa027, // 18: mov x, osr | ||
| 0x80a0, // 19: pull block | ||
| 0xa047, // 20: mov y, osr | ||
| 0xb0e1, // 21: mov osr, x side 0 | ||
| 0x7009, // 22: out pins, 9 side 0 | ||
| 0xb842, // 23: nop side 1 | ||
| 0x7001, // 24: out pins, 1 side 0 | ||
| 0x18f8, // 25: jmp !osre, 24 side 1 | ||
| 0x1095, // 26: jmp y--, 21 side 0 | ||
| // .wrap_target | ||
| 0x90a0, // 27: pull block side 0 | ||
| 0x7009, // 28: out pins, 9 side 0 | ||
| 0xb842, // 29: nop side 1 | ||
| 0x7001, // 30: out pins, 1 side 0 | ||
| 0x18fe, // 31: jmp !osre, 30 side 1 | ||
| // .wrap | ||
| }; | ||
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| #if !PICO_NO_HARDWARE | ||
| static const struct pio_program tft_io_program = { | ||
| .instructions = tft_io_program_instructions, | ||
| .length = 32, | ||
| .origin = -1, | ||
| }; | ||
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| static inline pio_sm_config tft_io_program_get_default_config(uint offset) { | ||
| pio_sm_config c = pio_get_default_sm_config(); | ||
| sm_config_set_wrap(&c, offset + tft_io_wrap_target, offset + tft_io_wrap); | ||
| sm_config_set_sideset(&c, 2, true, false); | ||
| return c; | ||
| } | ||
| #endif |
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