aboutsummaryrefslogtreecommitdiffstats
path: root/wirish/boards.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'wirish/boards.cpp')
-rw-r--r--wirish/boards.cpp145
1 files changed, 145 insertions, 0 deletions
diff --git a/wirish/boards.cpp b/wirish/boards.cpp
new file mode 100644
index 0000000..17f47c6
--- /dev/null
+++ b/wirish/boards.cpp
@@ -0,0 +1,145 @@
+/******************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2010 Perry Hung.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *****************************************************************************/
+
+/**
+ * @brief Generic board initialization routines.
+ *
+ * By default, we bring up all Maple boards to 72MHz, clocked off the
+ * PLL, driven by the 8MHz external crystal. AHB and APB2 are clocked
+ * at 72MHz. APB1 is clocked at 36MHz.
+ */
+
+#include "wirish.h"
+
+#include "flash.h"
+#include "rcc.h"
+#include "nvic.h"
+#include "systick.h"
+#include "gpio.h"
+#include "adc.h"
+#include "timer.h"
+#include "usb.h"
+
+static void setupFlash(void);
+static void setupClocks(void);
+static void setupADC(void);
+static void setupTimers(void);
+
+/**
+ * @brief Generic board initialization function.
+ *
+ * This function is called before main(). It ensures that the clocks
+ * and peripherals are configured properly for use with wirish, then
+ * calls boardInit().
+ *
+ * @see boardInit()
+ */
+void init(void) {
+ setupFlash();
+ setupClocks();
+ nvic_init();
+ systick_init(SYSTICK_RELOAD_VAL);
+ gpio_init_all();
+ afio_init();
+ setupADC();
+ setupTimers();
+ setupUSB();
+ boardInit();
+}
+
+static void setupFlash(void) {
+ flash_enable_prefetch();
+ flash_set_latency(FLASH_WAIT_STATE_2);
+}
+
+/*
+ * Clock setup. Note that some of this only takes effect if we're
+ * running bare metal and the bootloader hasn't done it for us
+ * already.
+ *
+ * If you change this function, you MUST change the file-level Doxygen
+ * comment above.
+ */
+static void setupClocks() {
+ rcc_clk_init(RCC_CLKSRC_PLL, RCC_PLLSRC_HSE, RCC_PLLMUL_9);
+ rcc_set_prescaler(RCC_PRESCALER_AHB, RCC_AHB_SYSCLK_DIV_1);
+ rcc_set_prescaler(RCC_PRESCALER_APB1, RCC_APB1_HCLK_DIV_2);
+ rcc_set_prescaler(RCC_PRESCALER_APB2, RCC_APB2_HCLK_DIV_1);
+}
+
+static void adcDefaultConfig(const adc_dev* dev);
+
+static void setupADC() {
+ adc_foreach(adcDefaultConfig);
+}
+
+static void timerDefaultConfig(timer_dev*);
+
+static void setupTimers() {
+ timer_foreach(timerDefaultConfig);
+}
+
+static void adcDefaultConfig(const adc_dev *dev) {
+ adc_init(dev);
+
+ adc_set_extsel(dev, ADC_SWSTART);
+ adc_set_exttrig(dev, true);
+
+ adc_enable(dev);
+ adc_calibrate(dev);
+ adc_set_sample_rate(dev, ADC_SMPR_55_5);
+}
+
+static void timerDefaultConfig(timer_dev *dev) {
+ timer_adv_reg_map *regs = (dev->regs).adv;
+ const uint16 full_overflow = 0xFFFF;
+ const uint16 half_duty = 0x8FFF;
+
+ timer_init(dev);
+ timer_pause(dev);
+
+ regs->CR1 = TIMER_CR1_ARPE;
+ regs->PSC = 1;
+ regs->SR = 0;
+ regs->DIER = 0;
+ regs->EGR = TIMER_EGR_UG;
+
+ switch (dev->type) {
+ case TIMER_ADVANCED:
+ regs->BDTR = TIMER_BDTR_MOE | TIMER_BDTR_LOCK_OFF;
+ // fall-through
+ case TIMER_GENERAL:
+ timer_set_reload(dev, full_overflow);
+
+ for (int channel = 1; channel <= 4; channel++) {
+ timer_set_compare(dev, channel, half_duty);
+ timer_oc_set_mode(dev, channel, TIMER_OC_MODE_PWM_1, TIMER_OC_PE);
+ }
+ // fall-through
+ case TIMER_BASIC:
+ break;
+ }
+
+ timer_resume(dev);
+}