restructuring

deprecated/F1/GPIO_TIM/timgpio.c

@@ -0,0 +1,61 @@
+/*
+ * timgpio.c
+ *
+ * Copyright 2016 Edward V. Emelianov <eddy@sao.ru, edward.emelianoff@gmail.com>
+ *
+ * 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 2 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+#include "timgpio.h"
+#include "user_proto.h"
+
+int transfer_complete = 0;
+static uint8_t addr[128];
+static uint32_t len = 0, curidx = 0;
+
+void timgpio_init(){
+	// init TIM2 & DMA1ch2 (TIM2UP)
+	rcc_periph_clock_enable(RCC_TIM2);
+	rcc_periph_clock_enable(RCC_DMA1);
+	timer_reset(TIM2);
+	// timer have frequency of 1MHz
+	timer_set_mode(TIM2, TIM_CR1_CKD_CK_INT, TIM_CR1_CMS_EDGE, TIM_CR1_DIR_UP);
+	// 72MHz main freq, 2MHz for timer
+	TIM2_PSC = 0;
+	TIM2_ARR = 35;
+	TIM2_DIER = TIM_DIER_UDE | TIM_DIER_UIE;
+	nvic_enable_irq(NVIC_TIM2_IRQ);
+}
+
+void tim2_isr(){
+	if(TIM2_SR & TIM_SR_UIF){ // update interrupt
+		GPIOA_ODR = addr[curidx];
+		if(++curidx >= len){
+			TIM2_CR1 &= ~TIM_CR1_CEN;
+			transfer_complete = 1;
+		}
+		TIM2_SR = 0;
+	}
+}
+
+
+void timgpio_transfer(uint8_t *databuf, uint32_t length){
+	transfer_complete = 0;
+	memcpy(addr, databuf, length);
+	len = length;
+	curidx = 0;
+	TIM2_CR1 |= TIM_CR1_CEN; // run timer
+}