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- /**
- * Marlin 3D Printer Firmware
- * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
- *
- * Based on Sprinter and grbl.
- * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
- *
- * 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/>.
- *
- */
-
- /**
- * Based on u8g_com_LPC1768_st7920_hw_spi.c
- *
- * Universal 8bit Graphics Library
- *
- * Copyright (c) 2011, olikraus@gmail.com
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without modification,
- * are permitted provided that the following conditions are met:
- *
- * * Redistributions of source code must retain the above copyright notice, this list
- * of conditions and the following disclaimer.
- *
- * * Redistributions in binary form must reproduce the above copyright notice, this
- * list of conditions and the following disclaimer in the documentation and/or other
- * materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
- * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
- #ifdef TARGET_LPC1768
-
- #include "../../../inc/MarlinConfigPre.h"
-
- #if HAS_MARLINUI_U8GLIB
-
- #include <U8glib.h>
- #include "../../shared/HAL_SPI.h"
- #include "../../shared/Delay.h"
-
- void spiBegin();
- void spiInit(uint8_t spiRate);
- void spiSend(uint8_t b);
- void spiSend(const uint8_t* buf, size_t n);
-
- static uint8_t rs_last_state = 255;
-
- static void u8g_com_LPC1768_st7920_write_byte_hw_spi(uint8_t rs, uint8_t val) {
-
- if (rs != rs_last_state) { // Time to send a command/data byte
- rs_last_state = rs;
- spiSend(rs ? 0x0FA : 0x0F8); // Send data or command
- DELAY_US(40); // Give the controller some time: 20 is bad, 30 is OK, 40 is safe
- }
-
- spiSend(val & 0xF0);
- spiSend(val << 4);
- }
-
- uint8_t u8g_com_HAL_LPC1768_ST7920_hw_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr) {
- switch (msg) {
- case U8G_COM_MSG_INIT:
- u8g_SetPILevel(u8g, U8G_PI_CS, 0);
- u8g_SetPIOutput(u8g, U8G_PI_CS);
- u8g_Delay(5);
- spiBegin();
- spiInit(SPI_EIGHTH_SPEED); // ST7920 max speed is about 1.1 MHz
- u8g->pin_list[U8G_PI_A0_STATE] = 0; // initial RS state: command mode
- break;
-
- case U8G_COM_MSG_STOP:
- break;
-
- case U8G_COM_MSG_RESET:
- u8g_SetPILevel(u8g, U8G_PI_RESET, arg_val);
- break;
-
- case U8G_COM_MSG_ADDRESS: // Define cmd (arg_val = 0) or data mode (arg_val = 1)
- u8g->pin_list[U8G_PI_A0_STATE] = arg_val;
- break;
-
- case U8G_COM_MSG_CHIP_SELECT:
- u8g_SetPILevel(u8g, U8G_PI_CS, arg_val); // Note: the ST7920 has an active high chip-select
- break;
-
- case U8G_COM_MSG_WRITE_BYTE:
- u8g_com_LPC1768_st7920_write_byte_hw_spi(u8g->pin_list[U8G_PI_A0_STATE], arg_val);
- break;
-
- case U8G_COM_MSG_WRITE_SEQ: {
- uint8_t *ptr = (uint8_t*) arg_ptr;
- while (arg_val > 0) {
- u8g_com_LPC1768_st7920_write_byte_hw_spi(u8g->pin_list[U8G_PI_A0_STATE], *ptr++);
- arg_val--;
- }
- }
- break;
-
- case U8G_COM_MSG_WRITE_SEQ_P: {
- uint8_t *ptr = (uint8_t*) arg_ptr;
- while (arg_val > 0) {
- u8g_com_LPC1768_st7920_write_byte_hw_spi(u8g->pin_list[U8G_PI_A0_STATE], *ptr++);
- arg_val--;
- }
- }
- break;
- }
- return 1;
- }
-
- #endif // HAS_MARLINUI_U8GLIB
-
- #endif // TARGET_LPC1768
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