kopia lustrzana https://github.com/OpenRTX/OpenRTX
65 wiersze
2.6 KiB
C
65 wiersze
2.6 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 <hwconfig.h>
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#include <stdint.h>
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/*
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* Implementation of external flash SPI interface for MDx devices.
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*/
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uint8_t spiFlash_SendRecv(uint8_t val)
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{
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SPI1->DR = val;
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while((SPI1->SR & SPI_SR_RXNE) == 0) ;
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return SPI1->DR;
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}
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void spiFlash_init()
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{
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gpio_setMode(FLASH_CLK, ALTERNATE);
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gpio_setMode(FLASH_SDO, ALTERNATE);
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gpio_setMode(FLASH_SDI, ALTERNATE);
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gpio_setAlternateFunction(FLASH_CLK, 5); /* SPI1 is on AF5 */
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gpio_setAlternateFunction(FLASH_SDO, 5);
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gpio_setAlternateFunction(FLASH_SDI, 5);
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RCC->APB2ENR |= RCC_APB2ENR_SPI1EN;
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__DSB();
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SPI1->CR1 = SPI_CR1_SSM /* Software managment of nCS */
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| SPI_CR1_SSI /* Force internal nCS */
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| SPI_CR1_BR_2 /* Fclock: 84MHz/64 = 1.3MHz */
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| SPI_CR1_BR_0
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| SPI_CR1_MSTR /* Master mode */
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| SPI_CR1_SPE; /* Enable peripheral */
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}
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void spiFlash_terminate()
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{
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RCC->APB2ENR &= ~RCC_APB2ENR_SPI1EN;
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__DSB();
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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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