Function modSPIInit

modules/pins/spi/esp/modSPI.c:67–99

#define SPI_CS_HOLD_DELAY_RES_S 16

void modSPIInit(modSPIConfiguration config)
{
	if (NULL == gConfig) {
		if ((13 != config->mosi_pin) || (12 != config->miso_pin) || (14 != config->clock_pin)) {
			modLog("invalid SPI");
			return;
		}

		WRITE_PERI_REG(PERIPHS_IO_MUX, 0x105); // clear bit 9

		PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTDI_U, 2); // HSPIQ MISO
		PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTCK_U, 2); // HSPID MOSI
		PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTMS_U, 2); // CLK

		gSPIDataCount = -1;
		SET_PERI_REG_MASK(SPI_FLASH_CMD(HSPI), SPI_FLASH_USR);

		SET_PERI_REG_BITS(SPI_CTRL1(HSPI), SPI_CS_HOLD_DELAY, 0, SPI_CS_HOLD_DELAY_S);

		ETS_SPI_INTR_ATTACH(spiTxInterrupt, NULL);
		ETS_SPI_INTR_ENABLE();
	}

	if (80000000 == config->hz) {
		#define hspi_enable_80Mhz()	 WRITE_PERI_REG(PERIPHS_IO_MUX, 0x305)
		hspi_enable_80Mhz();
		config->reserved = SPI_CLK_EQU_SYSCLK;
	}
	else
		config->reserved = frequencyToSPIClock(config->hz);
	
	modSPISetMode(config->mode);
}

void modSPIUninit(modSPIConfiguration config)
{