From: Martin Mares <mj@ucw.cz>
Date: Wed, 19 Feb 2020 21:58:27 +0000 (+0100)
Subject: BSB: An attempt at sending
X-Git-Url: http://mj.ucw.cz/gitweb/?a=commitdiff_plain;h=5286b9d20dd896a010e0d1db9f0813f5c489951e;p=home-hw.git

BSB: An attempt at sending
---

diff --git a/test-bsb/Makefile b/test-bsb/Makefile
index cab70cc..c6e1c3a 100644
--- a/test-bsb/Makefile
+++ b/test-bsb/Makefile
@@ -3,6 +3,6 @@ BINARY=test
 OBJS=test.o
 LIB_OBJS=util-debug.o
 
-WITH_SERIAL_FLASH=1
+# WITH_SERIAL_FLASH=1
 
 include $(ROOT)/mk/bluepill.mk
diff --git a/test-bsb/test.c b/test-bsb/test.c
index f923ffc..6ee4a90 100644
--- a/test-bsb/test.c
+++ b/test-bsb/test.c
@@ -12,11 +12,13 @@ static void clock_setup(void)
 {
 	rcc_clock_setup_in_hse_8mhz_out_72mhz();
 
+	rcc_periph_clock_enable(RCC_GPIOA);
 	rcc_periph_clock_enable(RCC_GPIOB);
 	rcc_periph_clock_enable(RCC_GPIOC);
 	rcc_periph_clock_enable(RCC_USART1);
 	rcc_periph_clock_enable(RCC_USART3);
 
+	rcc_periph_reset_pulse(RST_GPIOA);
 	rcc_periph_reset_pulse(RST_GPIOB);
 	rcc_periph_reset_pulse(RST_GPIOC);
 	rcc_periph_reset_pulse(RST_USART1);
@@ -44,12 +46,14 @@ static void tick_setup(void)
 	systick_interrupt_enable();
 }
 
+#if 0
 static void delay_ms(uint ms)
 {
 	u32 start_ticks = ms_ticks;
 	while (ms_ticks - start_ticks < ms)
 		;
 }
+#endif
 
 static void usart_setup(void)
 {
@@ -60,7 +64,8 @@ static void usart_setup(void)
 	usart_set_baudrate(USART1, 115200);
 	usart_set_databits(USART1, 8);
 	usart_set_stopbits(USART1, USART_STOPBITS_1);
-	usart_set_mode(USART1, USART_MODE_TX);
+	// usart_set_mode(USART1, USART_MODE_TX);
+	usart_set_mode(USART1, USART_MODE_TX_RX);
 	usart_set_parity(USART1, USART_PARITY_NONE);
 	usart_set_flow_control(USART1, USART_FLOWCONTROL_NONE);
 
@@ -68,18 +73,22 @@ static void usart_setup(void)
 
 	// BSB USART
 	gpio_set_mode(GPIOB, GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, GPIO_USART3_RX);
-	gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART3_TX);
+	gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_ALTFN_OPENDRAIN, GPIO_USART3_TX);
 
 	usart_set_baudrate(USART3, 4800);
-	usart_set_databits(USART3, 8);
+	usart_set_databits(USART3, 9);
 	usart_set_stopbits(USART3, USART_STOPBITS_1);
-	usart_set_mode(USART3, USART_MODE_RX);
+	usart_set_mode(USART3, USART_MODE_TX_RX);
 	usart_set_parity(USART3, USART_PARITY_ODD);
 	usart_set_flow_control(USART3, USART_FLOWCONTROL_NONE);
 
 	usart_enable(USART3);
 }
 
+static const byte send_pkt[] = {
+	0xdc, 0xc2, 0x00, 0x0b, 0x06, 0x3d, 0x2e, 0x11, 0x25, 0x40, 0x78,
+};
+
 int main(void)
 {
 	clock_setup();
@@ -90,16 +99,39 @@ int main(void)
 	SCB_VTOR = 0x08000000;
 	cm_enable_interrupts();
 
-	u32 start_ticks = ms_ticks;
+	debug_printf("Hello, kitty!\n");
+
+	u32 last_ticks = 0;
+	u32 led_ticks = ms_ticks;
+	uint tx_pos = 0;
 	for (;;) {
+		if (USART_SR(USART1) & USART_SR_RXNE) {
+			uint c = usart_recv(USART1) & 0xff;
+			if (c == '#')
+				tx_pos = 1;
+		}
 		if (USART_SR(USART3) & USART_SR_RXNE) {
-			uint x = usart_recv(USART3);
+			uint x = (usart_recv(USART3) & 0xff) ^ 0xff;
 			debug_printf("%02x ", x);
+			last_ticks = ms_ticks;
+		}
+		if (tx_pos && (USART_SR(USART3) & USART_SR_TXE)) {
+			if (tx_pos > sizeof(send_pkt)) {
+				tx_pos = 0;
+				debug_putc('.');
+			} else {
+				uint x = send_pkt[tx_pos++ - 1];
+				usart_send(USART3, x ^ 0xff);
+				debug_putc('>');
+			}
+		}
+		if (last_ticks && ms_ticks - last_ticks >= 100) {
+			last_ticks = 0;
+			debug_putc('\n');
 		}
-		if (ms_ticks - start_ticks >= 100) {
-			start_ticks = ms_ticks;
+		if (ms_ticks - led_ticks >= 100) {
+			led_ticks = ms_ticks;
 			debug_led_toggle();
-			debug_putc(' ');
 		}
 	}