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Merge pull request #296 from ZuluSCSI/pico
Firmware for the ZuluSCSI Pico
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| .pio | ||
| .vscode/.browse.c_cpp.db* | ||
| .vscode/c_cpp_properties.json | ||
| .vscode/launch.json | ||
| .vscode/ipch | ||
| .vscode/extensions.json | ||
| .vscode |
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171 changes: 171 additions & 0 deletions
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lib/ZuluSCSI_platform_RP2040/ZuluSCSI_platform_gpio_Pico.h
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| /** | ||
| * ZuluSCSI™ - Copyright (c) 2022 Rabbit Hole Computing™ | ||
| * | ||
| * ZuluSCSI™ firmware is licensed under the GPL version 3 or any later version. | ||
| * | ||
| * https://www.gnu.org/licenses/gpl-3.0.html | ||
| * ---- | ||
| * This program is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program. If not, see <https://www.gnu.org/licenses/>. | ||
| **/ | ||
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| // GPIO definitions for ZuluSCSI RP2040-based hardware | ||
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| #pragma once | ||
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| #include <hardware/gpio.h> | ||
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| // SCSI data input/output port. | ||
| // The data bus uses external bidirectional buffer, with | ||
| // direction controlled by DATA_DIR pin. | ||
| #define SCSI_IO_DB0 0 | ||
| #define SCSI_IO_DB1 1 | ||
| #define SCSI_IO_DB2 2 | ||
| #define SCSI_IO_DB3 3 | ||
| #define SCSI_IO_DB4 4 | ||
| #define SCSI_IO_DB5 5 | ||
| #define SCSI_IO_DB6 6 | ||
| #define SCSI_IO_DB7 7 | ||
| #define SCSI_IO_DBP 8 | ||
| #define SCSI_IO_DATA_MASK 0x1FF | ||
| #define SCSI_IO_SHIFT 0 | ||
|
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| // Data direction control | ||
| #define SCSI_DATA_DIR 9 | ||
|
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| // SCSI output status lines | ||
| #define SCSI_OUT_IO 22 | ||
| #define SCSI_OUT_CD 18 | ||
| #define SCSI_OUT_MSG 20 | ||
| #define SCSI_OUT_RST 21 | ||
| #define SCSI_OUT_BSY 27 | ||
| #define SCSI_OUT_REQ 17 | ||
| #define SCSI_OUT_SEL 19 | ||
|
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| // SCSI input status signals | ||
| #define SCSI_IN_SEL 18 | ||
| #define SCSI_IN_ACK 26 | ||
| #define SCSI_IN_ATN 28 | ||
| #define SCSI_IN_BSY 20 | ||
| #define SCSI_IN_RST 21 | ||
|
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| // Status line outputs for initiator mode | ||
| #define SCSI_OUT_ACK 26 | ||
| #define SCSI_OUT_ATN 28 | ||
|
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| // Status line inputs for initiator mode | ||
| #define SCSI_IN_IO 22 | ||
| #define SCSI_IN_CD 18 | ||
| #define SCSI_IN_MSG 20 | ||
| #define SCSI_IN_REQ 17 | ||
|
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| // Status LED pins | ||
| #define LED_PIN 16 | ||
| #define LED_ON() sio_hw->gpio_set = 1 << LED_PIN | ||
| #define LED_OFF() sio_hw->gpio_clr = 1 << LED_PIN | ||
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| // SD card pins in SDIO mode | ||
| #define SDIO_CLK 10 | ||
| #define SDIO_CMD 11 | ||
| #define SDIO_D0 12 | ||
| #define SDIO_D1 13 | ||
| #define SDIO_D2 14 | ||
| #define SDIO_D3 15 | ||
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| // SD card pins in SPI mode | ||
| #define SD_SPI spi0 | ||
| #define SD_SPI_SCK 10 | ||
| #define SD_SPI_MOSI 11 | ||
| #define SD_SPI_MISO 12 | ||
| #define SD_SPI_CS 15 | ||
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| #ifndef ENABLE_AUDIO_OUTPUT | ||
| // No spare pins for I2C | ||
| // IO expander I2C | ||
| // #define GPIO_I2C_SDA 14 | ||
| // #define GPIO_I2C_SCL 15 | ||
| #else | ||
| // IO expander I2C pins being used as SPI for audio | ||
| #define AUDIO_SPI spi1 | ||
| #define GPIO_EXP_SPARE 14 | ||
| #define GPIO_EXP_AUDIO 15 | ||
| #endif | ||
|
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| // DIP switch pins | ||
| #define HAS_DIP_SWITCHES | ||
| #define DIP_INITIATOR 28 | ||
| #define DIP_DBGLOG 17 | ||
| #define DIP_TERM 22 | ||
|
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| // Other pins | ||
| #define SWO_PIN 16 | ||
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| // Below are GPIO access definitions that are used from scsiPhy.cpp. | ||
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| // Write a single SCSI pin. | ||
| // Example use: SCSI_OUT(ATN, 1) sets SCSI_ATN to low (active) state. | ||
| #define SCSI_OUT(pin, state) \ | ||
| *(state ? &sio_hw->gpio_clr : &sio_hw->gpio_set) = 1 << (SCSI_OUT_ ## pin) | ||
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| // Read a single SCSI pin. | ||
| // Example use: SCSI_IN(ATN), returns 1 for active low state. | ||
| #define SCSI_IN(pin) \ | ||
| ((sio_hw->gpio_in & (1 << (SCSI_IN_ ## pin))) ? 0 : 1) | ||
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| // Set pin directions for initiator vs. target mode | ||
| #define SCSI_ENABLE_INITIATOR() \ | ||
| (sio_hw->gpio_oe_set = (1 << SCSI_OUT_ACK) | \ | ||
| (1 << SCSI_OUT_ATN)), \ | ||
| (sio_hw->gpio_oe_clr = (1 << SCSI_IN_IO) | \ | ||
| (1 << SCSI_IN_CD) | \ | ||
| (1 << SCSI_IN_MSG) | \ | ||
| (1 << SCSI_IN_REQ)) | ||
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| // Enable driving of shared control pins | ||
| #define SCSI_ENABLE_CONTROL_OUT() \ | ||
| (sio_hw->gpio_oe_set = (1 << SCSI_OUT_CD) | \ | ||
| (1 << SCSI_OUT_MSG)) | ||
|
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| // Set SCSI data bus to output | ||
| #define SCSI_ENABLE_DATA_OUT() \ | ||
| (sio_hw->gpio_clr = (1 << SCSI_DATA_DIR), \ | ||
| sio_hw->gpio_oe_set = SCSI_IO_DATA_MASK) | ||
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| // Write SCSI data bus, also sets REQ to inactive. | ||
| #define SCSI_OUT_DATA(data) \ | ||
| gpio_put_masked(SCSI_IO_DATA_MASK | (1 << SCSI_OUT_REQ), \ | ||
| g_scsi_parity_lookup[(uint8_t)(data)] | (1 << SCSI_OUT_REQ)), \ | ||
| SCSI_ENABLE_DATA_OUT() | ||
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| // Release SCSI data bus and REQ signal | ||
| #define SCSI_RELEASE_DATA_REQ() \ | ||
| (sio_hw->gpio_oe_clr = SCSI_IO_DATA_MASK, \ | ||
| sio_hw->gpio_set = (1 << SCSI_DATA_DIR) | (1 << SCSI_OUT_REQ)) | ||
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| // Release all SCSI outputs | ||
| #define SCSI_RELEASE_OUTPUTS() \ | ||
| SCSI_RELEASE_DATA_REQ(), \ | ||
| sio_hw->gpio_oe_clr = (1 << SCSI_OUT_CD) | \ | ||
| (1 << SCSI_OUT_MSG), \ | ||
| sio_hw->gpio_set = (1 << SCSI_OUT_IO) | \ | ||
| (1 << SCSI_OUT_CD) | \ | ||
| (1 << SCSI_OUT_MSG) | \ | ||
| (1 << SCSI_OUT_RST) | \ | ||
| (1 << SCSI_OUT_BSY) | \ | ||
| (1 << SCSI_OUT_REQ) | \ | ||
| (1 << SCSI_OUT_SEL) | ||
|
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| // Read SCSI data bus | ||
| #define SCSI_IN_DATA() \ | ||
| (~sio_hw->gpio_in & SCSI_IO_DATA_MASK) >> SCSI_IO_SHIFT | ||
|
|
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,46 @@ | ||
| ; ZuluSCSI™ - Copyright (c) 2022 Rabbit Hole Computing™ | ||
| ; | ||
| ; ZuluSCSI™ firmware is licensed under the GPL version 3 or any later version. | ||
| ; | ||
| ; https://www.gnu.org/licenses/gpl-3.0.html | ||
| ; ---- | ||
| ; This program is free software: you can redistribute it and/or modify | ||
| ; it under the terms of the GNU General Public License as published by | ||
| ; the Free Software Foundation, either version 3 of the License, or | ||
| ; (at your option) any later version. | ||
| ; | ||
| ; This program is distributed in the hope that it will be useful, | ||
| ; but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| ; GNU General Public License for more details. | ||
| ; | ||
| ; You should have received a copy of the GNU General Public License | ||
| ; along with this program. If not, see <https://www.gnu.org/licenses/>. | ||
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| ; RP2040 PIO program for accelerating SCSI initiator / host function | ||
| ; Run "pioasm scsi_accel_host.pio scsi_accel_host.pio.h" to regenerate the C header from this. | ||
| ; GPIO mapping: | ||
| ; - 0-7: DB0-DB7 | ||
| ; - 8: DBP | ||
| ; Side set is ACK pin | ||
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| .define REQ 17 | ||
| .define ACK 26 | ||
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| ; Read from SCSI bus using asynchronous handshake. | ||
| ; Data is returned as 16-bit words that contain the 8 data bits + 1 parity bit. | ||
| ; Number of bytes to receive minus 1 should be written to TX fifo. | ||
| ; Number of bytes to receive must be divisible by 2. | ||
| .program scsi_host_async_read | ||
| .side_set 1 | ||
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| pull block side 1 ; Get number of bytes to receive | ||
| mov x, osr side 1 ; Store to counter X | ||
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| start: | ||
| wait 0 gpio REQ side 1 ; Wait for REQ low | ||
| in pins, 9 side 0 ; Assert ACK, read GPIO | ||
| in null, 7 side 0 ; Padding bits | ||
| wait 1 gpio REQ side 0 ; Wait for REQ high | ||
| jmp x-- start side 1 ; Deassert ACK, decrement byte count and jump to start |
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