From 869118f74612829db47d0d681cee5b4af937b16f Mon Sep 17 00:00:00 2001
From: root <root@lumpy.lan>
Date: Tue, 30 Nov 2021 00:24:43 +0000
Subject: tmc2209 first cut

---
 stm32/app/usart.c | 83 +++++++++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 71 insertions(+), 12 deletions(-)

(limited to 'stm32/app/usart.c')

diff --git a/stm32/app/usart.c b/stm32/app/usart.c
index 6b44656..e48eff5 100644
--- a/stm32/app/usart.c
+++ b/stm32/app/usart.c
@@ -2,11 +2,11 @@
 
 #define BUFFER_SIZE 512
 
-ring_t usart_rx_ring;
-static uint8_t usart_rx_ring_buf[BUFFER_SIZE];
+ring_t usart1_rx_ring;
+static uint8_t usart1_rx_ring_buf[BUFFER_SIZE];
 
-ring_t usart_tx_ring;
-static uint8_t usart_tx_ring_buf[BUFFER_SIZE];
+ring_t usart1_tx_ring;
+static uint8_t usart1_tx_ring_buf[BUFFER_SIZE];
 
 void
 usart1_isr (void)
@@ -18,13 +18,13 @@ usart1_isr (void)
       ((USART_SR (USART1) & USART_SR_RXNE) != 0)) {
     /* Retrieve the data from the peripheral. */
     data = usart_recv (USART1);
-    ring_write_byte (&usart_rx_ring, data);
+    ring_write_byte (&usart1_rx_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 (&usart_tx_ring, &data)) {
+    if (ring_read_byte (&usart1_tx_ring, &data)) {
       /*No more data, Disable the TXE interrupt, it's no longer needed. */
       USART_CR1 (USART1) &= ~USART_CR1_TXEIE;
     } else
@@ -32,9 +32,10 @@ usart1_isr (void)
   }
 }
 
-void usart_kick (void)
+
+void usart1_kick (void)
 {
-  if (!ring_empty (&usart_tx_ring))
+  if (!ring_empty (&usart1_tx_ring))
     USART_CR1 (USART1) |= USART_CR1_TXEIE;
 }
 
@@ -45,8 +46,8 @@ _write (int file, char *ptr, int len)
   int ret;
 
   if (file == 1) {
-    ret = ring_write (&usart_tx_ring, (uint8_t *) ptr, len);
-    usart_kick();
+    ret = ring_write (&usart1_tx_ring, (uint8_t *) ptr, len);
+    usart1_kick();
     ring_write (&cdcacm_tx_ring, (uint8_t *) ptr, len);
 
     if (ret < 0)
@@ -59,14 +60,44 @@ _write (int file, char *ptr, int len)
   return -1;
 }
 
+#define TRANSACT_TIMEOUT (HZ/2)
+
+int usart_transact (uint32_t u, void *_b, size_t txl, size_t rxl)
+{
+  uint8_t *b = _b;
+  uint32_t then = DWT_CYCCNT;
+
+  while (USART_SR (u) & USART_SR_RXNE)
+    (void) usart_recv (u);
+
+
+  while (txl--) {
+    while (! (USART_SR (USART1) & USART_SR_TXE))
+      if ((DWT_CYCCNT - then) > TRANSACT_TIMEOUT) return -1;
+
+    usart_send (u, * (b++));
+  }
+
+  b = _b;
+
+  while (rxl--) {
+    while (! (USART_SR (USART1) & USART_SR_RXNE))
+      if ((DWT_CYCCNT - then) > TRANSACT_TIMEOUT) return -1;
+
+    * (b++) = usart_recv (u);
+  }
+
+  return 0;
+}
+
 
 
 
 void
 usart_init (void)
 {
-  ring_init (&usart_rx_ring, usart_rx_ring_buf, sizeof (usart_rx_ring_buf));
-  ring_init (&usart_tx_ring, usart_tx_ring_buf, sizeof (usart_tx_ring_buf));
+  ring_init (&usart1_rx_ring, usart1_rx_ring_buf, sizeof (usart1_rx_ring_buf));
+  ring_init (&usart1_tx_ring, usart1_tx_ring_buf, sizeof (usart1_tx_ring_buf));
   /* Enable the USART1 interrupt. */
   nvic_enable_irq (NVIC_USART1_IRQ);
 
@@ -85,4 +116,32 @@ usart_init (void)
   USART_CR1 (USART1) |= USART_CR1_RXNEIE;
   /* Finally enable USART1. */
   usart_enable (USART1);
+
+
+  MAP_AF (USART2_TX);
+  MAP_AF_PU (USART2_RX);
+
+  /* Setup UART1 parameters. */
+  usart_set_baudrate (USART2, 115200);
+  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 (USART2);
+
+  MAP_AF (USART3_TX);
+  MAP_AF_PU (USART3_RX);
+
+  /* Setup UART1 parameters. */
+  usart_set_baudrate (USART3, 115200);
+  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_enable (USART3);
+
+
+
 }
-- 
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