qmk_firmware/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
 */

#ifndef _GDISP_LLD_BOARD_H
#define _GDISP_LLD_BOARD_H

#include "quantum.h"

#define ST7565_LCD_BIAS ST7565_LCD_BIAS_7
#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_A0_PIN C7
#define ST7565_RST_PIN C8
#define ST7565_MOSI_PIN C6
#define ST7565_SCLK_PIN C5
#define ST7565_SS_PIN C4

// 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 = PAL_PORT(ST7565_SS_PIN),
    // brief The chip select line pad number - when not using pcs.
    .sspad = PAL_PAD(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;
    setPinOutput(ST7565_A0_PIN);
    writePinHigh(ST7565_A0_PIN);
    setPinOutput(ST7565_RST_PIN);
    writePinHigh(ST7565_RST_PIN);
    setPinOutput(ST7565_SS_PIN);

    palSetPadMode(PAL_PORT(ST7565_MOSI_PIN), PAL_PAD(ST7565_MOSI_PIN), PAL_MODE_ALTERNATIVE_2);
    palSetPadMode(PAL_PORT(ST7565_SCLK_PIN), PAL_PAD(ST7565_SCLK_PIN), PAL_MODE_ALTERNATIVE_2);

    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;
    writePin(ST7565_RST_PIN, !state);
}

static GFXINLINE void write_cmd(GDisplay *g, gU8 cmd) {
    (void)g;
    writePinLow(ST7565_A0_PIN);
    spiSend(&SPID1, 1, &cmd);
}

static GFXINLINE void write_data(GDisplay *g, gU8 *data, gU16 length) {
    (void)g;
    writePinHigh(ST7565_A0_PIN);
    spiSend(&SPID1, length, data);
}

#endif /* _GDISP_LLD_BOARD_H */