From 74e577ac110513669a6d677842ceca4c5b1252ca Mon Sep 17 00:00:00 2001
From: fishsoupisgood <github@madingley.org>
Date: Sat, 4 May 2019 12:37:04 +0100
Subject: cut #1

---
 app/usart.c | 87 +++++++++++++++++++++++++++++++++----------------------------
 1 file changed, 47 insertions(+), 40 deletions(-)

(limited to 'app/usart.c')

diff --git a/app/usart.c b/app/usart.c
index e826a22..5d5614d 100644
--- a/app/usart.c
+++ b/app/usart.c
@@ -4,11 +4,11 @@
 #define BIG_BUFFER_SIZE 600
 
 
-volatile ring_t rx3_ring;
-static uint8_t rx3_ring_buf[BUFFER_SIZE];
+volatile ring_t rx2_ring;
+static uint8_t rx2_ring_buf[BUFFER_SIZE];
 
-volatile ring_t tx3_ring;
-static uint8_t tx3_ring_buf[BUFFER_SIZE];
+volatile ring_t tx2_ring;
+static uint8_t tx2_ring_buf[BUFFER_SIZE];
 
 volatile ring_t rx1_ring;
 static uint8_t rx1_ring_buf[BUFFER_SIZE];
@@ -23,62 +23,64 @@ static uint8_t tx1_ring_buf[BUFFER_SIZE];
 #define RX1   GPIO10
 #define RX1_PORT  GPIOA
 
-#define TX3   GPIO10
-#define TX3_PORT  GPIOC
+#define TX2   GPIO5
+#define TX2_PORT  GPIOD
 
-#define RX3   GPIO11
-#define RX3_PORT  GPIOC
+#define RX2   GPIO6
+#define RX2_PORT  GPIOD
 
+#define RX2_EN   GPIO4
+#define RX2_EN_PORT  GPIOG
 
-void usart3_isr (void)
+void usart2_isr (void)
 {
   uint8_t data;
 
   /* Check if we were called because of RXNE. */
-  if (((USART_CR1 (USART3) & USART_CR1_RXNEIE) != 0) &&
-      ((USART_SR (USART3) & USART_SR_RXNE) != 0)) {
+  if (((USART_CR1 (USART2) & USART_CR1_RXNEIE) != 0) &&
+      ((USART_SR (USART2) & USART_SR_RXNE) != 0)) {
 
     /* Retrieve the data from the peripheral. */
-    data = usart_recv (USART3);
+    data = usart_recv (USART2);
 
-    ring_write_byte (&rx3_ring, data);
+    ring_write_byte (&rx2_ring, data);
     //usart6_queue(data);
   }
 
   /* Check if we were called because of TXE. */
-  if (((USART_CR1 (USART3) & USART_CR1_TXEIE) != 0) &&
-      ((USART_SR (USART3) & USART_SR_TXE) != 0)) {
+  if (((USART_CR1 (USART2) & USART_CR1_TXEIE) != 0) &&
+      ((USART_SR (USART2) & USART_SR_TXE) != 0)) {
 
-    if (ring_read_byte (&tx3_ring, &data)) {
+    if (ring_read_byte (&tx2_ring, &data)) {
       /*No more data, Disable the TXE interrupt, it's no longer needed. */
-      usart_disable_tx_interrupt (USART3);
+      usart_disable_tx_interrupt (USART2);
     } else
-      usart_send_blocking (USART3, data);
+      usart_send_blocking (USART2, data);
   }
 
 }
 
 void
-usart3_queue (uint8_t d)
+usart2_queue (uint8_t d)
 {
-  ring_write_byte (&tx3_ring, d);
-  usart_enable_tx_interrupt (USART3);
+  ring_write_byte (&tx2_ring, d);
+  usart_enable_tx_interrupt (USART2);
 }
 
 void
-usart3_drain (void)
+usart2_drain (void)
 {
-  while (!ring_empty (&tx3_ring));
+  while (!ring_empty (&tx2_ring));
 }
 
 
 int
-usart3_write (char *ptr, int len, int blocking)
+usart2_write (char *ptr, int len, int blocking)
 {
   int ret;
 
-  ret = ring_write (&tx3_ring, (uint8_t *) ptr, len, blocking);
-  usart_enable_tx_interrupt (USART3);
+  ret = ring_write (&tx2_ring, (uint8_t *) ptr, len, blocking);
+  usart_enable_tx_interrupt (USART2);
   return ret;
 }
 
@@ -140,33 +142,38 @@ void
 usart_init (void)
 {
 
-  ring_init (&rx3_ring, rx3_ring_buf, sizeof (rx3_ring_buf));
-  ring_init (&tx3_ring, tx3_ring_buf, sizeof (tx3_ring_buf));
+  ring_init (&rx2_ring, rx2_ring_buf, sizeof (rx2_ring_buf));
+  ring_init (&tx2_ring, tx2_ring_buf, sizeof (tx2_ring_buf));
 
-  MAP_AF (TX3, GPIO_AF7);
-  MAP_AF_PU (RX3, GPIO_AF7);
+  MAP_OUTPUT_PP (RX2_EN);
+  SET (RX2_EN);
 
-  usart_set_baudrate (USART3, 9600);
-  usart_set_databits (USART3, 8);
-  usart_set_stopbits (USART3, USART_STOPBITS_1);
-  usart_set_parity (USART3, USART_PARITY_NONE);
-  usart_set_flow_control (USART3, USART_FLOWCONTROL_NONE);
-  usart_set_mode (USART3, USART_MODE_TX_RX);
+  MAP_INPUT (RX2);
+  MAP_AF (TX2, GPIO_AF7);
+  MAP_AF_PU (RX2, GPIO_AF7);
 
-  usart_enable_rx_interrupt (USART3);
+  usart_set_baudrate (USART2, 38400);
+  usart_set_databits (USART2, 8);
+  usart_set_stopbits (USART2, USART_STOPBITS_1);
+  usart_set_parity (USART2, USART_PARITY_NONE);
+  usart_set_flow_control (USART2, USART_FLOWCONTROL_NONE);
+  usart_set_mode (USART2, USART_MODE_TX_RX);
 
-  usart_enable (USART3);
+  usart_enable_rx_interrupt (USART2);
 
-  nvic_enable_irq (NVIC_USART3_IRQ);
+  usart_enable (USART2);
+
+  nvic_enable_irq (NVIC_USART2_IRQ);
 
 
   ring_init (&rx1_ring, rx1_ring_buf, sizeof (rx1_ring_buf));
   ring_init (&tx1_ring, tx1_ring_buf, sizeof (tx1_ring_buf));
 
+  MAP_INPUT (RX1);
   MAP_AF (TX1, GPIO_AF7);
   MAP_AF_PU (RX1, GPIO_AF7);
 
-  usart_set_baudrate (USART1, 38400);
+  usart_set_baudrate (USART1, 9600);
   usart_set_databits (USART1, 8);
   usart_set_stopbits (USART1, USART_STOPBITS_1);
   usart_set_parity (USART1, USART_PARITY_NONE);
-- 
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