qmk_firmware_custom/keyboards/ergodox_infinity/board_st7565.h

/*
 * This file is subject to the terms of the GFX License. If a copy of
 * the license was not distributed with this file, you can obtain one at:
 *
 *              http://ugfx.org/license.html
 */

#pragma once

#define ST7565_LCD_BIAS         ST7565_LCD_BIAS_9 // actually 6
#define ST7565_ADC              ST7565_ADC_NORMAL
#define ST7565_COM_SCAN         ST7565_COM_SCAN_DEC
#define ST7565_PAGE_ORDER       0,1,2,3
/*
 * Custom page order for several LCD boards, e.g. HEM12864-99
 * #define ST7565_PAGE_ORDER       4,5,6,7,0,1,2,3
 */

#define ST7565_GPIOPORT GPIOC
#define ST7565_PORT PORTC
#define ST7565_A0_PIN 7
#define ST7565_RST_PIN 8
#define ST7565_MOSI_PIN 6
#define ST7565_SLCK_PIN 5
#define ST7565_SS_PIN 4

#define palSetPadModeRaw(portname, bits) \
    ST7565_PORT->PCR[ST7565_##portname##_PIN] = bits

#define palSetPadModeNamed(portname, portmode) \
    palSetPadMode(ST7565_GPIOPORT, ST7565_##portname##_PIN, portmode)

#define ST7565_SPI_MODE PORTx_PCRn_DSE | PORTx_PCRn_MUX(2)
// DSPI Clock and Transfer Attributes
// Frame Size: 8 bits
// MSB First
// CLK Low by default
static const SPIConfig spi1config = {
   // Operation complete callback or @p NULL.
  .end_cb = NULL,
   //The chip select line port - when not using pcs.
  .ssport = ST7565_GPIOPORT,
   // brief The chip select line pad number - when not using pcs.
  .sspad=ST7565_SS_PIN,
   // SPI initialization data.
  .tar0 =
    SPIx_CTARn_FMSZ(7) // Frame size = 8 bytes
    | SPIx_CTARn_ASC(1) // After SCK Delay Scaler (min 50 ns) = 55.56ns
    | SPIx_CTARn_DT(0) // Delay After Transfer Scaler (no minimum)= 27.78ns
    | SPIx_CTARn_CSSCK(0) // PCS to SCK Delay Scaler (min 20 ns) = 27.78ns
    | SPIx_CTARn_PBR(0) // Baud Rate Prescaler = 2
    | SPIx_CTARn_BR(0) // Baud rate (min 50ns) = 55.56ns
};

static GFXINLINE void acquire_bus(GDisplay *g) {
    (void) g;
    // Only the LCD is using the SPI bus, so no need to acquire
    // spiAcquireBus(&SPID1);
    spiSelect(&SPID1);
}

static GFXINLINE void release_bus(GDisplay *g) {
    (void) g;
    // Only the LCD is using the SPI bus, so no need to release
    //spiReleaseBus(&SPID1);
    spiUnselect(&SPID1);
}

static GFXINLINE void init_board(GDisplay *g) {
    (void) g;
    palSetPadModeNamed(A0, PAL_MODE_OUTPUT_PUSHPULL);
    palSetPad(ST7565_GPIOPORT, ST7565_A0_PIN);
    palSetPadModeNamed(RST, PAL_MODE_OUTPUT_PUSHPULL);
    palSetPad(ST7565_GPIOPORT, ST7565_RST_PIN);
    palSetPadModeRaw(MOSI, ST7565_SPI_MODE);
    palSetPadModeRaw(SLCK, ST7565_SPI_MODE);
    palSetPadModeNamed(SS, PAL_MODE_OUTPUT_PUSHPULL);

    spiInit();
    spiStart(&SPID1, &spi1config);
    release_bus(g);
}

static GFXINLINE void post_init_board(GDisplay *g) {
    (void) g;
}

static GFXINLINE void setpin_reset(GDisplay *g, bool_t state) {
    (void) g;
    if (state) {
        palClearPad(ST7565_GPIOPORT, ST7565_RST_PIN);
    }
    else {
        palSetPad(ST7565_GPIOPORT, ST7565_RST_PIN);
    }
}

static GFXINLINE void enter_data_mode(GDisplay *g) {
    palSetPad(ST7565_GPIOPORT, ST7565_A0_PIN);
}

static GFXINLINE void enter_cmd_mode(GDisplay *g) {
    palClearPad(ST7565_GPIOPORT, ST7565_A0_PIN);
}


static GFXINLINE void write_data(GDisplay *g, uint8_t* data, uint16_t length) {
    (void) g;
    spiSend(&SPID1, length, data);
}