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- /**
- * Marlin 3D Printer Firmware
- * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
- *
- * 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 <http://www.gnu.org/licenses/>.
- *
- */
- #ifdef __STM32F1__
-
- #include "../../../inc/MarlinConfig.h"
-
- #if HAS_GRAPHICAL_LCD && ENABLED(FORCE_SOFT_SPI)
-
- #include "../HAL.h"
- #include <U8glib.h>
-
- #undef SPI_SPEED
- #define SPI_SPEED 0 // Fastest
- //#define SPI_SPEED 2 // Slower
-
- static uint8_t SPI_speed = SPI_SPEED;
-
- static inline uint8_t swSpiTransfer_mode_0(uint8_t b, const uint8_t spi_speed, const pin_t miso_pin=-1) {
- LOOP_L_N(i, 8) {
- if (spi_speed == 0) {
- WRITE(DOGLCD_MOSI, !!(b & 0x80));
- WRITE(DOGLCD_SCK, HIGH);
- b <<= 1;
- if (miso_pin >= 0 && READ(miso_pin)) b |= 1;
- WRITE(DOGLCD_SCK, LOW);
- }
- else {
- const uint8_t state = (b & 0x80) ? HIGH : LOW;
- LOOP_L_N(j, spi_speed)
- WRITE(DOGLCD_MOSI, state);
-
- LOOP_L_N(j, spi_speed + (miso_pin >= 0 ? 0 : 1))
- WRITE(DOGLCD_SCK, HIGH);
-
- b <<= 1;
- if (miso_pin >= 0 && READ(miso_pin)) b |= 1;
-
- LOOP_L_N(j, spi_speed)
- WRITE(DOGLCD_SCK, LOW);
- }
- }
- return b;
- }
-
- static inline uint8_t swSpiTransfer_mode_3(uint8_t b, const uint8_t spi_speed, const pin_t miso_pin=-1) {
- LOOP_L_N(i, 8) {
- const uint8_t state = (b & 0x80) ? HIGH : LOW;
- if (spi_speed == 0) {
- WRITE(DOGLCD_SCK, LOW);
- WRITE(DOGLCD_MOSI, state);
- WRITE(DOGLCD_MOSI, state); // need some setup time
- WRITE(DOGLCD_SCK, HIGH);
- }
- else {
- LOOP_L_N(j, spi_speed + (miso_pin >= 0 ? 0 : 1))
- WRITE(DOGLCD_SCK, LOW);
-
- LOOP_L_N(j, spi_speed)
- WRITE(DOGLCD_MOSI, state);
-
- LOOP_L_N(j, spi_speed)
- WRITE(DOGLCD_SCK, HIGH);
- }
- b <<= 1;
- if (miso_pin >= 0 && READ(miso_pin)) b |= 1;
- }
- return b;
- }
-
- static void u8g_sw_spi_HAL_STM32F1_shift_out(uint8_t val) {
- #if ENABLED(FYSETC_MINI_12864)
- swSpiTransfer_mode_3(val, SPI_speed);
- #else
- swSpiTransfer_mode_0(val, SPI_speed);
- #endif
- }
-
- static uint8_t swSpiInit(const uint8_t spi_speed) {
- #if PIN_EXISTS(LCD_RESET)
- SET_OUTPUT(LCD_RESET_PIN);
- #endif
- SET_OUTPUT(DOGLCD_A0);
- OUT_WRITE(DOGLCD_SCK, LOW);
- OUT_WRITE(DOGLCD_MOSI, LOW);
- OUT_WRITE(DOGLCD_CS, HIGH);
- return spi_speed;
- }
-
- uint8_t u8g_com_HAL_STM32F1_sw_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr) {
- switch (msg) {
- case U8G_COM_MSG_INIT:
- SPI_speed = swSpiInit(SPI_SPEED);
- break;
-
- case U8G_COM_MSG_STOP:
- break;
-
- case U8G_COM_MSG_RESET:
- #if PIN_EXISTS(LCD_RESET)
- WRITE(LCD_RESET_PIN, arg_val);
- #endif
- break;
-
- case U8G_COM_MSG_CHIP_SELECT:
- #if ENABLED(FYSETC_MINI_12864) // This LCD SPI is running mode 3 while SD card is running mode 0
- if (arg_val) { // SCK idle state needs to be set to the proper idle state before
- // the next chip select goes active
- WRITE(DOGLCD_SCK, HIGH); // Set SCK to mode 3 idle state before CS goes active
- WRITE(DOGLCD_CS, LOW);
- }
- else {
- WRITE(DOGLCD_CS, HIGH);
- WRITE(DOGLCD_SCK, LOW); // Set SCK to mode 0 idle state after CS goes inactive
- }
- #else
- WRITE(DOGLCD_CS, !arg_val);
- #endif
- break;
-
- case U8G_COM_MSG_WRITE_BYTE:
- u8g_sw_spi_HAL_STM32F1_shift_out(arg_val);
- break;
-
- case U8G_COM_MSG_WRITE_SEQ: {
- uint8_t *ptr = (uint8_t *)arg_ptr;
- while (arg_val > 0) {
- u8g_sw_spi_HAL_STM32F1_shift_out(*ptr++);
- arg_val--;
- }
- } break;
-
- case U8G_COM_MSG_WRITE_SEQ_P: {
- uint8_t *ptr = (uint8_t *)arg_ptr;
- while (arg_val > 0) {
- u8g_sw_spi_HAL_STM32F1_shift_out(u8g_pgm_read(ptr));
- ptr++;
- arg_val--;
- }
- } break;
-
- case U8G_COM_MSG_ADDRESS: /* define cmd (arg_val = 0) or data mode (arg_val = 1) */
- WRITE(DOGLCD_A0, arg_val);
- break;
- }
- return 1;
- }
-
- #endif // HAS_GRAPHICAL_LCD
- #endif // STM32F1
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