Add beginnings of a SPI flash driver

1 files changed, 37 insertions, 36 deletions

diff --git a/controller/fw/main.c b/controller/fw/main.c
index 7359c59..846aa8c 100644
--- a/controller/fw/main.c
+++ b/controller/fw/main.c
@@ -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);
 }
 
-int main(void)
+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)
 {
-	int i;
+    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);
 
-	clock_setup();
-	gpio_setup();
+    spi_init(&spif, SPI1, &spi_flash_if_set_cs);
+}
+
+int main(void)
+{
+    clock_setup();
+    led_setup();
+    spi_flash_setup();
 
-	gpio_set(GPIOA, GPIO6);
+    gpio_set(GPIOA, GPIO6);
 
-	while (1) {
-		gpio_toggle(GPIOA, GPIO6 | GPIO7);
-		for (i = 0; i < 6000000; i++)
-			__asm__("nop");
-	}
+    while (1) {
+        gpio_toggle(GPIOA, GPIO6 | GPIO7);
+        for (int i = 0; i < 6000000; i++)
+            __asm__("nop");
+    }
 
-	return 0;
+    return 0;
 }