From d7ff6b6242add979d20be3d7992028d8b4040f45 Mon Sep 17 00:00:00 2001
From: Martin Mares <mj@ucw.cz>
Date: Sun, 14 Jul 2019 20:50:12 +0200
Subject: [PATCH] Aircon: MODBUS

---
 aircon/Makefile |  2 +-
 aircon/README   |  2 +-
 aircon/config.h |  5 ++-
 aircon/main.c   | 86 +++++++++++++++++++++++++++++++++++++++++++++----
 4 files changed, 85 insertions(+), 10 deletions(-)

diff --git a/aircon/Makefile b/aircon/Makefile
index 15d7d8e..1b9f247 100644
--- a/aircon/Makefile
+++ b/aircon/Makefile
@@ -1,6 +1,6 @@
 ROOT=..
 BINARY=main
 OBJS=main.o
-LIB_OBJS=util-debug.o ds18b20.o
+LIB_OBJS=util-debug.o ds18b20.o modbus.o
 
 include $(ROOT)/mk/bluepill.mk
diff --git a/aircon/README b/aircon/README
index fab35a7..e5a5dab 100644
--- a/aircon/README
+++ b/aircon/README
@@ -27,7 +27,7 @@ bypass opto-coupler	| PC15		 PB9 |
 RS485 TX enable		| PA6		PA15 |
 TIM3_CH2 - DS18B20 bus	| PA7		PA12 |
 bypass LED* (green)	| PB0		PA11 |
-RC active LED* (red)	| PB1		PA10 |  RXD1 - debugging console
+MODBUS frame LED* (red)	| PB1		PA10 |  RXD1 - debugging console
 TXD3 - RS485		| PB10		 PA9 |  TXD1 - debugging console
 RXD3 - RS485		| PB11		 PA8 |
 			| RESET		PB15 |
diff --git a/aircon/config.h b/aircon/config.h
index 77a5f33..a73fe50 100644
--- a/aircon/config.h
+++ b/aircon/config.h
@@ -11,6 +11,7 @@
 // Debugging port
 
 #define DEBUG_USART USART1
+#define DEBUG_LED_BLUEPILL
 
 // MODBUS library parameters
 
@@ -19,7 +20,7 @@
 #define MODBUS_USART_ISR usart3_isr
 
 #define MODBUS_TXEN_GPIO_PORT GPIOA
-#define MODBUS_TXEN_GPIO_PIN GPIO1
+#define MODBUS_TXEN_GPIO_PIN GPIO6
 
 #define MODBUS_TIMER TIM2
 #define MODBUS_NVIC_TIMER_IRQ NVIC_TIM2_IRQ
@@ -29,6 +30,8 @@
 
 #define MODBUS_BAUD_RATE 19200
 
+#define MODBUS_DEBUG
+
 // DS18B20 library parameters
 
 #define DS_TIMER TIM3
diff --git a/aircon/main.c b/aircon/main.c
index 09d563a..db09ae1 100644
--- a/aircon/main.c
+++ b/aircon/main.c
@@ -6,6 +6,7 @@
 
 #include "util.h"
 #include "ds18b20.h"
+#include "modbus.h"
 
 #include <libopencm3/cm3/nvic.h>
 #include <libopencm3/cm3/systick.h>
@@ -61,7 +62,7 @@ static void gpio_setup(void)
 	gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_OPENDRAIN, GPIO0);
 	gpio_set(GPIOB, GPIO0);
 
-	// PB1 = IR RC active LED*
+	// PB1 = MODBUS frame LED*
 	gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_OPENDRAIN, GPIO1);
 	gpio_set(GPIOB, GPIO1);
 
@@ -174,17 +175,17 @@ int main(void)
 	debug_puts("Hello, world!\n");
 
 	ds_init();
+	modbus_init();
 
 	for (;;) {
-		gpio_toggle(GPIOC, GPIO13);
-
-		gpio_clear(GPIOB, GPIO1);
-		delay_ms(100);
-		gpio_set(GPIOB, GPIO1);
+		debug_led_toggle();
 
 		gpio_clear(GPIOB, GPIO0);
-		delay_ms(100);
+		delay_ms(50);
 		gpio_set(GPIOB, GPIO0);
+		delay_ms(50);
+
+		modbus_loop();
 	}
 
 #if 0
@@ -232,3 +233,74 @@ int main(void)
 
 	return 0;
 }
+
+/*** Modbus callbacks ***/
+
+bool modbus_check_discrete_input(u16 addr UNUSED)
+{
+	return false;
+}
+
+bool modbus_get_discrete_input(u16 addr UNUSED)
+{
+	return false;
+}
+
+bool modbus_check_coil(u16 addr UNUSED)
+{
+	return false;
+}
+
+bool modbus_get_coil(u16 addr UNUSED)
+{
+	return false;
+}
+
+void modbus_set_coil(u16 addr UNUSED, bool value UNUSED)
+{
+}
+
+bool modbus_check_input_register(u16 addr UNUSED)
+{
+	return false;
+}
+
+u16 modbus_get_input_register(u16 addr UNUSED)
+{
+	return 0;
+}
+
+bool modbus_check_holding_register(u16 addr UNUSED)
+{
+	return (addr < 16);
+}
+
+u16 modbus_get_holding_register(u16 addr UNUSED)
+{
+	return 0xbeef;
+}
+
+void modbus_set_holding_register(u16 addr UNUSED, u16 value UNUSED)
+{
+}
+
+void modbus_ready_hook(void)
+{
+	// Frame LED off
+	gpio_set(GPIOB, GPIO1);
+}
+
+void modbus_frame_start_hook(void)
+{
+	// Frame LED on
+	gpio_clear(GPIOB, GPIO1);
+}
+
+const char * const modbus_id_strings[MODBUS_ID_MAX] = {
+	[MODBUS_ID_VENDOR_NAME] = "United Computer Wizards",
+	[MODBUS_ID_PRODUCT_CODE] = "42",
+	[MODBUS_ID_MAJOR_MINOR_REVISION] = "1.0",
+	[MODBUS_ID_VENDOR_URL] = "http://www.ucw.cz/",
+	[MODBUS_ID_PRODUCT_NAME] = "Magic Gadget",
+	[MODBUS_ID_USER_APP_NAME] = NULL,
+};
-- 
2.39.5