/***************************************************************************
* Copyright (C) 2020 by Federico Amedeo Izzo IU2NUO, *
* Niccolò Izzo IU2KIN *
* Frederik Saraci IU2NRO *
* Silvano Seva IU2KWO *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 3 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, see *
***************************************************************************/
#include
#include
#include
/*
* Implementation of external flash SPI interface for MDx devices.
*/
uint8_t spiFlash_SendRecv(uint8_t val)
{
SPI1->DR = val;
while((SPI1->SR & SPI_SR_RXNE) == 0) ;
return SPI1->DR;
}
void spiFlash_init()
{
gpio_setMode(FLASH_CLK, ALTERNATE);
gpio_setMode(FLASH_SDO, ALTERNATE);
gpio_setMode(FLASH_SDI, ALTERNATE);
gpio_setAlternateFunction(FLASH_CLK, 5); /* SPI1 is on AF5 */
gpio_setAlternateFunction(FLASH_SDO, 5);
gpio_setAlternateFunction(FLASH_SDI, 5);
RCC->APB2ENR |= RCC_APB2ENR_SPI1EN;
__DSB();
SPI1->CR1 = SPI_CR1_SSM /* Software managment of nCS */
| SPI_CR1_SSI /* Force internal nCS */
| SPI_CR1_BR_2 /* Fclock: 84MHz/64 = 1.3MHz */
| SPI_CR1_BR_0
| SPI_CR1_MSTR /* Master mode */
| SPI_CR1_SPE; /* Enable peripheral */
}
void spiFlash_terminate()
{
RCC->APB2ENR &= ~RCC_APB2ENR_SPI1EN;
__DSB();
gpio_setMode(FLASH_CLK, INPUT);
gpio_setMode(FLASH_SDO, INPUT);
gpio_setMode(FLASH_SDI, INPUT);
}