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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 <https://www.gnu.org/licenses/>.
*
*/
#ifdef __STM32F1__
#include "../../../inc/MarlinConfig.h"
#if BOTH(HAS_MARLINUI_U8GLIB, FORCE_SOFT_SPI)
#include <U8glib.h>
#include "../../shared/HAL_SPI.h"
#ifndef LCD_SPI_SPEED
#define LCD_SPI_SPEED SPI_FULL_SPEED // Fastest
//#define LCD_SPI_SPEED SPI_QUARTER_SPEED // Slower
#endif
static uint8_t SPI_speed = LCD_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(LCD_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_MARLINUI_U8GLIB && FORCE_SOFT_SPI
#endif // STM32F1
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