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171 lines
5.7 KiB
171 lines
5.7 KiB
/**
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* Marlin 3D Printer Firmware
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* Copyright (c) 2021 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
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*
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* Based on Sprinter and grbl.
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* Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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*/
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/**
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* Based on u8g_com_st7920_hw_spi.c
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*
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* Universal 8bit Graphics Library
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*
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* Copyright (c) 2011, olikraus@gmail.com
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice, this list
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* of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright notice, this
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* list of conditions and the following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef __PLAT_NATIVE_SIM__
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#include "../../../inc/MarlinConfig.h"
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#if IS_U8GLIB_ST7920
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#include <U8glib-HAL.h>
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#include "../../shared/Delay.h"
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#undef SPI_SPEED
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#define SPI_SPEED 6
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#define SPI_DELAY_CYCLES (1 + SPI_SPEED * 10)
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static pin_t SCK_pin_ST7920_HAL, MOSI_pin_ST7920_HAL_HAL;
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static uint8_t SPI_speed = 0;
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static uint8_t swSpiTransfer(uint8_t b, const uint8_t spi_speed, const pin_t sck_pin, const pin_t miso_pin, const pin_t mosi_pin) {
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for (uint8_t i = 0; i < 8; i++) {
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WRITE_PIN(mosi_pin, !!(b & 0x80));
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DELAY_CYCLES(SPI_SPEED);
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WRITE_PIN(sck_pin, HIGH);
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DELAY_CYCLES(SPI_SPEED);
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b <<= 1;
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if (miso_pin >= 0 && READ_PIN(miso_pin)) b |= 1;
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WRITE_PIN(sck_pin, LOW);
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DELAY_CYCLES(SPI_SPEED);
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}
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return b;
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}
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static uint8_t swSpiInit(const uint8_t spiRate, const pin_t sck_pin, const pin_t mosi_pin) {
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WRITE_PIN(mosi_pin, HIGH);
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WRITE_PIN(sck_pin, LOW);
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return spiRate;
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}
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static void u8g_com_st7920_write_byte_sw_spi(uint8_t rs, uint8_t val) {
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static uint8_t rs_last_state = 255;
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if (rs != rs_last_state) {
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// Transfer Data (FA) or Command (F8)
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swSpiTransfer(rs ? 0x0FA : 0x0F8, SPI_speed, SCK_pin_ST7920_HAL, -1, MOSI_pin_ST7920_HAL_HAL);
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rs_last_state = rs;
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DELAY_US(40); // Give the controller time to process the data: 20 is bad, 30 is OK, 40 is safe
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}
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swSpiTransfer(val & 0x0F0, SPI_speed, SCK_pin_ST7920_HAL, -1, MOSI_pin_ST7920_HAL_HAL);
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swSpiTransfer(val << 4, SPI_speed, SCK_pin_ST7920_HAL, -1, MOSI_pin_ST7920_HAL_HAL);
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}
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#ifdef __cplusplus
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extern "C" {
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#endif
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uint8_t u8g_com_ST7920_sw_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr) {
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switch (msg) {
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case U8G_COM_MSG_INIT:
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SCK_pin_ST7920_HAL = u8g->pin_list[U8G_PI_SCK];
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MOSI_pin_ST7920_HAL_HAL = u8g->pin_list[U8G_PI_MOSI];
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u8g_SetPIOutput(u8g, U8G_PI_CS);
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u8g_SetPIOutput(u8g, U8G_PI_SCK);
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u8g_SetPIOutput(u8g, U8G_PI_MOSI);
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u8g_Delay(5);
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SPI_speed = swSpiInit(SPI_SPEED, SCK_pin_ST7920_HAL, MOSI_pin_ST7920_HAL_HAL);
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u8g_SetPILevel(u8g, U8G_PI_CS, 0);
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u8g_SetPILevel(u8g, U8G_PI_SCK, 0);
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u8g_SetPILevel(u8g, U8G_PI_MOSI, 0);
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u8g->pin_list[U8G_PI_A0_STATE] = 0; /* initial RS state: command mode */
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break;
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case U8G_COM_MSG_STOP:
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break;
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case U8G_COM_MSG_RESET:
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if (U8G_PIN_NONE != u8g->pin_list[U8G_PI_RESET]) u8g_SetPILevel(u8g, U8G_PI_RESET, arg_val);
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break;
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case U8G_COM_MSG_ADDRESS: /* define cmd (arg_val = 0) or data mode (arg_val = 1) */
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u8g->pin_list[U8G_PI_A0_STATE] = arg_val;
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break;
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case U8G_COM_MSG_CHIP_SELECT:
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if (U8G_PIN_NONE != u8g->pin_list[U8G_PI_CS]) u8g_SetPILevel(u8g, U8G_PI_CS, arg_val); //note: the st7920 has an active high chip select
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break;
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case U8G_COM_MSG_WRITE_BYTE:
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u8g_com_st7920_write_byte_sw_spi(u8g->pin_list[U8G_PI_A0_STATE], arg_val);
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break;
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case U8G_COM_MSG_WRITE_SEQ: {
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uint8_t *ptr = (uint8_t*) arg_ptr;
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while (arg_val > 0) {
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u8g_com_st7920_write_byte_sw_spi(u8g->pin_list[U8G_PI_A0_STATE], *ptr++);
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arg_val--;
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}
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}
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break;
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case U8G_COM_MSG_WRITE_SEQ_P: {
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uint8_t *ptr = (uint8_t*) arg_ptr;
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while (arg_val > 0) {
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u8g_com_st7920_write_byte_sw_spi(u8g->pin_list[U8G_PI_A0_STATE], *ptr++);
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arg_val--;
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}
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}
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break;
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}
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return 1;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif // IS_U8GLIB_ST7920
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#endif // TARGET_LPC1768
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