Added software I2C on timer TIM2

2026-03-21 09:11:02 +03:00 · 2015-10-01 11:05:35 +03:00
parent 4345cedd6e
commit 99a2c601cc
14 changed files with 1386 additions and 0 deletions
--- a/si7005_softi2c/main.c
+++ b/si7005_softi2c/main.c
@@ -0,0 +1,100 @@
+/*
+ * blinky.c
+ *
+ * Copyright 2014 Edward V. Emelianoff <eddy@sao.ru>
+ *
+ * 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 "ports_definition.h"
+#include "interrupts.h"
+#include "uart.h"
+#include "si7005.h"
+
+volatile unsigned long Global_time = 0L; // global time in ms
+U16 paused_val = 500; // interval between LED flashing
+
+int main() {
+	unsigned long T = 0L, siT = 0L;
+	U8 rb;
+	CFG_GCR |= 1; // disable SWIM
+	// Configure clocking
+	CLK_CKDIVR = 0; // F_HSI = 16MHz, f_CPU = 16MHz
+// Timer 4 (8 bit) used as system tick timer
+	// prescaler == 128 (2^7), Tfreq = 125kHz
+	// period = 1ms, so ARR = 125
+	TIM4_PSCR = 7;
+	TIM4_ARR = 125;
+	// interrupts: update
+	TIM4_IER = TIM_IER_UIE;
+	// auto-reload + interrupt on overflow + enable
+	TIM4_CR1 = TIM_CR1_APRE | TIM_CR1_URS | TIM_CR1_CEN;
+
+	// PC2 - PP output (on-board LED)
+	PORT(LED_PORT, DDR)  |= LED_PIN;
+	PORT(LED_PORT, CR1)  |= LED_PIN;
+
+	uart_init();
+
+	si7005_setup();
+
+	// enable all interrupts
+	enableInterrupts();
+
+	// Loop
+	do{
+		if((Global_time - T > paused_val) || (T > Global_time)){
+			T = Global_time;
+			PORT(LED_PORT, ODR) ^= LED_PIN; // blink on-board LED
+		}
+		if(UART_read_byte(&rb)){ // buffer isn't empty
+			switch(rb){
+				case 'h': // help
+					uart_write("\nPROTO:\n+/-\tLED period\n"
+						"I\tread Si7005 device id\n"
+						"T\tread themperature\n"
+						"H\tread humidity\n"
+						//"O\tread OPT"
+					);
+				break;
+				case '+':
+					paused_val += 100;
+					if(paused_val > 10000)
+						paused_val = 500; // but not more than 10s
+				break;
+				case '-':
+					paused_val -= 100;
+					if(paused_val < 500)  // but not less than 0.5s
+						paused_val = 500;
+				break;
+				case 'I':
+					si7005_read_ID();
+				break;
+				case 'T':
+					si7005_read_T();
+				break;
+				case 'H':
+					si7005_read_H();
+				break;
+			}
+		}
+		if(Global_time != siT){
+			siT = Global_time;
+			si7005_process();
+		}
+	}while(1);
+}
+
+