From adb5eef77e646b7d063bdacccf883bb9ce6b2ade Mon Sep 17 00:00:00 2001
From: Paul Selkirk <paul@psgd.org>
Date: Wed, 6 Jul 2016 15:10:14 -0400
Subject: Add uart_set_default() to make debugging output easier.

---
 projects/hsm/hsm.c |  3 ++-
 stm-uart.c         | 15 ++++++++++-----
 stm-uart.h         |  2 ++
 3 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/projects/hsm/hsm.c b/projects/hsm/hsm.c
index 9cc6e9a..f4683b3 100644
--- a/projects/hsm/hsm.c
+++ b/projects/hsm/hsm.c
@@ -129,7 +129,7 @@ void HAL_UART2_RxCpltCallback(UART_HandleTypeDef *huart)
 
 hal_error_t hal_serial_send_char(uint8_t c)
 {
-    return (uart_send_char(c) == 0) ? HAL_OK : HAL_ERROR_RPC_TRANSPORT;
+    return (uart_send_char2(STM_UART_USER, c) == 0) ? HAL_OK : HAL_ERROR_RPC_TRANSPORT;
 }
 
 hal_error_t hal_serial_recv_char(uint8_t *cp)
@@ -203,6 +203,7 @@ static uint8_t *sdram_malloc(size_t size)
 int main()
 {
     stm_init();
+    uart_set_default(STM_UART_MGMT);
 
     led_on(LED_GREEN);
     /* Prepare FMC interface. */
diff --git a/stm-uart.c b/stm-uart.c
index 7911d44..05190fb 100644
--- a/stm-uart.c
+++ b/stm-uart.c
@@ -43,8 +43,13 @@ UART_HandleTypeDef huart_user;  /* USART2 */
 DMA_HandleTypeDef hdma_usart_mgmt_rx;
 DMA_HandleTypeDef hdma_usart_user_rx;
 
-#define DEFAULT_UART STM_UART_USER
+static stm_uart_port_t default_uart = STM_UART_USER;
 
+void uart_set_default(stm_uart_port_t port)
+{
+    if (port == STM_UART_USER || port == STM_UART_MGMT)
+        default_uart = port;
+}
 
 inline UART_HandleTypeDef *_which_uart(stm_uart_port_t port)
 {
@@ -60,7 +65,7 @@ inline UART_HandleTypeDef *_which_uart(stm_uart_port_t port)
 /* send a single character */
 HAL_StatusTypeDef uart_send_char(uint8_t ch)
 {
-    return uart_send_char2(DEFAULT_UART, ch);
+    return uart_send_char2(default_uart, ch);
 }
 
 HAL_StatusTypeDef uart_send_char2(stm_uart_port_t port, uint8_t ch)
@@ -71,7 +76,7 @@ HAL_StatusTypeDef uart_send_char2(stm_uart_port_t port, uint8_t ch)
 /* receive a single character */
 HAL_StatusTypeDef uart_recv_char(uint8_t *cp)
 {
-    return uart_recv_char2(DEFAULT_UART, cp, HAL_MAX_DELAY);
+    return uart_recv_char2(default_uart, cp, HAL_MAX_DELAY);
 }
 
 /* receive a single character */
@@ -88,7 +93,7 @@ HAL_StatusTypeDef uart_recv_char2(stm_uart_port_t port, uint8_t *cp, uint32_t ti
 /* send a string */
 HAL_StatusTypeDef uart_send_string(char *s)
 {
-    return uart_send_string2(DEFAULT_UART, s);
+    return uart_send_string2(default_uart, s);
 }
 
 /* send a string */
@@ -129,7 +134,7 @@ HAL_StatusTypeDef uart_receive_bytes(stm_uart_port_t port, uint8_t *buf, size_t
  */
 HAL_StatusTypeDef uart_send_number(uint32_t num, uint8_t digits, uint8_t radix)
 {
-    return uart_send_number2(DEFAULT_UART, num, digits, radix);
+    return uart_send_number2(default_uart, num, digits, radix);
 }
 
 HAL_StatusTypeDef uart_send_number2(stm_uart_port_t port, uint32_t num, uint8_t digits, uint8_t radix)
diff --git a/stm-uart.h b/stm-uart.h
index 6133093..3efd799 100644
--- a/stm-uart.h
+++ b/stm-uart.h
@@ -51,6 +51,8 @@ extern UART_HandleTypeDef huart_user;
 extern DMA_HandleTypeDef hdma_usart_mgmt_rx;
 extern DMA_HandleTypeDef hdma_usart_user_rx;
 
+extern void uart_set_default(stm_uart_port_t port);
+
 extern HAL_StatusTypeDef uart_send_char(uint8_t ch);
 extern HAL_StatusTypeDef uart_recv_char(uint8_t *cp);
 
-- 
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