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Add beginnings of a SPI flash driver

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jaseg 2020-02-25 18:05:14 +01:00
parent 031380141d
commit 2964bda23c
4 changed files with 245 additions and 37 deletions
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73
controller/fw/main.c
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@ -1,53 +1,54 @@
/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
* Copyright (C) 2011 Damjan Marion <damjan.marion@gmail.com>
* Copyright (C) 2011 Mark Panajotovic <marko@electrontube.org>
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdbool.h>
#include <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/gpio.h>
/* Set STM32 to 168 MHz. */
static struct spi_flash_if spif;
static void clock_setup(void)
{
rcc_clock_setup_pll(&rcc_hse_8mhz_3v3[RCC_CLOCK_3V3_168MHZ]);
rcc_periph_clock_enable(RCC_GPIOA);
rcc_clock_setup_pll(&rcc_hse_8mhz_3v3[RCC_CLOCK_3V3_168MHZ]);
rcc_periph_clock_enable(RCC_GPIOA);
rcc_periph_clock_enable(RCC_GPIOB);
rcc_periph_clock_enable(RCC_SPI1);
}
static void gpio_setup(void)
static void led_setup(void)
{
gpio_mode_setup(GPIOA, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO6 | GPIO7);
gpio_mode_setup(GPIOA, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO6 | GPIO7);
}
static void spi_flash_if_set_cs(bool val) {
if (val)
gpio_set(GPIOB, GPIO0);
else
gpio_clear(GPIOB, GPIO0);
}
static void spi_flash_setup(void)
{
gpio_mode_setup(GPIOB, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO3 | GPIO4 | GPIO5); /* SPI flash SCK/MISO/MOSI */
gpio_mode_setup(GPIOB, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO0); /* SPI flash CS */
gpio_set_output_options(GPIOB, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO0 | GPIO3 | GPIO4 | GPIO5);
gpio_set_af(GPIOB, 5, GPIO3 | GPIO4 | GPIO5);
spi_init(&spif, SPI1, &spi_flash_if_set_cs);
}
int main(void)
{
int i;
clock_setup();
led_setup();
spi_flash_setup();
clock_setup();
gpio_setup();
gpio_set(GPIOA, GPIO6);
gpio_set(GPIOA, GPIO6);
while (1) {
gpio_toggle(GPIOA, GPIO6 | GPIO7);
for (int i = 0; i < 6000000; i++)
__asm__("nop");
}
while (1) {
gpio_toggle(GPIOA, GPIO6 | GPIO7);
for (i = 0; i < 6000000; i++)
__asm__("nop");
}
return 0;
return 0;
}