From 9d87c925a9eaa4fc256be3173c14a20d1469472d Mon Sep 17 00:00:00 2001
From: fishsoupisgood <github@madingley.org>
Date: Wed, 9 Sep 2020 11:53:37 +0100
Subject: everything, mostly, working

---
 boiler-monster/stm32/app/usart.c | 175 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 175 insertions(+)
 create mode 100644 boiler-monster/stm32/app/usart.c

(limited to 'boiler-monster/stm32/app/usart.c')

diff --git a/boiler-monster/stm32/app/usart.c b/boiler-monster/stm32/app/usart.c
new file mode 100644
index 0000000..28676a0
--- /dev/null
+++ b/boiler-monster/stm32/app/usart.c
@@ -0,0 +1,175 @@
+#include "project.h"
+
+#define BUFFER_SIZE 256
+
+
+#define USART1_TX GPIO_USART1_TX
+#define USART1_TX_PORT GPIOA
+
+#define USART1_RX GPIO_USART1_RX
+#define USART1_RX_PORT GPIOA
+
+#define USART3_TX GPIO_USART3_TX
+#define USART3_TX_PORT GPIOB
+
+#define USART3_RX GPIO_USART3_RX
+#define USART3_RX_PORT GPIOB
+
+
+
+ring_t rx1_ring;
+static uint8_t rx1_ring_buf[BUFFER_SIZE];
+
+ring_t tx1_ring;
+static uint8_t tx1_ring_buf[BUFFER_SIZE];
+
+ring_t rx3_ring;
+static uint8_t rx3_ring_buf[BUFFER_SIZE];
+
+ring_t tx3_ring;
+static uint8_t tx3_ring_buf[BUFFER_SIZE];
+
+void
+usart1_isr (void)
+{
+  uint8_t data;
+
+  /* Check if we were called because of RXNE. */
+  if (((USART_CR1 (USART1) & USART_CR1_RXNEIE) != 0) &&
+      ((USART_SR (USART1) & USART_SR_RXNE) != 0)) {
+    data = usart_recv (USART1);
+    ring_write_byte (&rx1_ring, data);
+  }
+
+  /* Check if we were called because of TXE. */
+  if (((USART_CR1 (USART1) & USART_CR1_TXEIE) != 0) &&
+      ((USART_SR (USART1) & USART_SR_TXE) != 0)) {
+
+    if (ring_read_byte (&tx1_ring, &data)) {
+      /*No more data, Disable the TXE interrupt, it's no longer needed. */
+      usart_disable_tx_interrupt (USART1);
+    } else
+      usart_send_blocking (USART1, data);
+  }
+
+}
+
+void
+usart1_queue (uint8_t d)
+{
+  ring_write_byte (&tx1_ring, d);
+  usart_enable_tx_interrupt (USART1);
+}
+
+void
+usart1_drain (void)
+{
+  while (!ring_empty (&tx1_ring));
+}
+
+
+int
+usart1_write (char *ptr, int len, int blocking)
+{
+  int ret;
+
+  ret = ring_write (&tx1_ring, (uint8_t *) ptr, len, blocking);
+  usart_enable_tx_interrupt (USART1);
+  return ret;
+}
+
+
+void
+usart3_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)) {
+    data = usart_recv (USART3);
+    ring_write_byte (&rx3_ring, 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 (ring_read_byte (&tx3_ring, &data)) {
+      /*No more data, Disable the TXE interrupt, it's no longer needed. */
+      usart_disable_tx_interrupt (USART3);
+    } else
+      usart_send_blocking (USART3, data);
+  }
+
+}
+
+void
+usart3_queue (uint8_t d)
+{
+  ring_write_byte (&tx3_ring, d);
+  usart_enable_tx_interrupt (USART3);
+}
+
+void
+usart3_drain (void)
+{
+  while (!ring_empty (&tx3_ring));
+}
+
+
+int
+usart3_write (char *ptr, int len, int blocking)
+{
+  int ret;
+
+  ret = ring_write (&tx3_ring, (uint8_t *) ptr, len, blocking);
+  usart_enable_tx_interrupt (USART3);
+  return ret;
+}
+
+
+void
+usart_init (void)
+{
+  ring_init (&rx1_ring, rx1_ring_buf, sizeof (rx1_ring_buf));
+  ring_init (&tx1_ring, tx1_ring_buf, sizeof (tx1_ring_buf));
+
+  nvic_enable_irq (NVIC_USART1_IRQ);
+
+  MAP_AF (USART1_TX);
+  MAP_AF_PU (USART1_RX);
+
+
+  usart_set_baudrate (USART1, 57600);
+  usart_set_databits (USART1, 8);
+  usart_set_stopbits (USART1, USART_STOPBITS_1);
+  usart_set_parity (USART1, USART_PARITY_NONE);
+  usart_set_flow_control (USART1, USART_FLOWCONTROL_NONE);
+  usart_set_mode (USART1, USART_MODE_TX_RX);
+
+  USART_CR1 (USART1) |= USART_CR1_RXNEIE;
+
+  usart_enable (USART1);
+
+
+  ring_init (&rx3_ring, rx3_ring_buf, sizeof (rx3_ring_buf));
+  ring_init (&tx3_ring, tx3_ring_buf, sizeof (tx3_ring_buf));
+
+
+  nvic_enable_irq (NVIC_USART3_IRQ);
+
+  MAP_AF (USART3_TX);
+  MAP_AF_PU (USART3_RX);
+
+  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);
+
+  USART_CR1 (USART3) |= USART_CR1_RXNEIE;
+
+  usart_enable (USART3);
+}
-- 
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