kopia lustrzana https://github.com/OpenRTX/OpenRTX
75 wiersze
2.5 KiB
C
75 wiersze
2.5 KiB
C
/***************************************************************************
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* Copyright (C) 2020 by Federico Amedeo Izzo IU2NUO, *
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* Niccolò Izzo IU2KIN *
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* Frederik Saraci IU2NRO *
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* Silvano Seva IU2KWO *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, see <http://www.gnu.org/licenses/> *
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***************************************************************************/
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#include <interfaces/gpio.h>
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#include <interfaces/delays.h>
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#include <hwconfig.h>
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#include <stdint.h>
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/*
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* Implementation of external flash SPI interface for GDx devices.
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* In these radios the SPI communication has to be managed through software bit
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* banging, since there is no SPI peripheral available.
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*/
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uint8_t spiFlash_SendRecv(uint8_t val)
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{
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uint8_t data = 0;
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for(uint8_t i = 0; i < 8; i++)
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{
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gpio_clearPin(FLASH_CLK);
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delayUs(1);
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if((val << i) & 0x80)
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{
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gpio_setPin(FLASH_SDO);
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}
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else
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{
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gpio_clearPin(FLASH_SDO);
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}
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gpio_setPin(FLASH_CLK);
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delayUs(1);
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data <<= 1;
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data |= (gpio_readPin(FLASH_SDI)) ? 0x01 : 0x00;
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}
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return data;
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}
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void spiFlash_init()
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{
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gpio_setMode(FLASH_CLK, OUTPUT);
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gpio_setMode(FLASH_SDO, OUTPUT);
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gpio_setMode(FLASH_SDI, INPUT);
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gpio_clearPin(FLASH_CLK);
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gpio_clearPin(FLASH_SDO);
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}
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void spiFlash_terminate()
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{
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gpio_setMode(FLASH_CLK, INPUT);
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gpio_setMode(FLASH_SDO, INPUT);
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gpio_setMode(FLASH_SDI, INPUT);
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}
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