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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

If you are looking for a stable and tested release, please import one of the official mbed library releases:

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The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

Files at this revision

API Documentation at this revision

Revision 600:7d17ca308cd1, committed 2015-07-31

Comitter:
mbed_official
Date:
Fri Jul 31 14:15:09 2015 +0100
Parent:
599:efb83a170500
Child:
601:248b0d2dd755
Commit message:
Synchronized with git revision e4cd8bbd3e05b68e5a7f466c74035a85743d45e0

Full URL: https://github.com/mbedmicro/mbed/commit/e4cd8bbd3e05b68e5a7f466c74035a85743d45e0/

Enable LPC8xx usart when configuring it

Changed in this revision

targets/hal/TARGET_NXP/TARGET_LPC81X/serial_api.c Show annotated file Show diff for this revision Revisions of this file
targets/hal/TARGET_NXP/TARGET_LPC82X/serial_api.c Show annotated file Show diff for this revision Revisions of this file 
--- a/targets/hal/TARGET_NXP/TARGET_LPC81X/serial_api.c	Fri Jul 31 14:00:09 2015 +0100
+++ b/targets/hal/TARGET_NXP/TARGET_LPC81X/serial_api.c	Fri Jul 31 14:15:09 2015 +0100
@@ -196,8 +196,18 @@
         default:
             break;
     }
-    
-    obj->uart->CFG = (data_bits << 2)
+
+    // First disable the the usart as described in documentation and then enable while updating CFG
+
+    // 24.6.1 USART Configuration register
+    // Remark: If software needs to change configuration values, the following sequence should
+    // be used: 1) Make sure the USART is not currently sending or receiving data. 2) Disable
+    // the USART by writing a 0 to the Enable bit (0 may be written to the entire register). 3)
+    // Write the new configuration value, with the ENABLE bit set to 1.
+    obj->uart->CFG &= ~(1 << 0);
+
+    obj->uart->CFG = (1 << 0) // this will enable the usart
+                   | (data_bits << 2)
                    | (paritysel << 4)
                    | (stop_bits << 6);
 }

--- a/targets/hal/TARGET_NXP/TARGET_LPC82X/serial_api.c	Fri Jul 31 14:00:09 2015 +0100
+++ b/targets/hal/TARGET_NXP/TARGET_LPC82X/serial_api.c	Fri Jul 31 14:15:09 2015 +0100
@@ -230,7 +230,17 @@
             break;
     }
 
-    obj->uart->CFG = (data_bits << 2)
+    // First disable the the usart as described in documentation and then enable while updating CFG
+
+    // 24.6.1 USART Configuration register
+    // Remark: If software needs to change configuration values, the following sequence should
+    // be used: 1) Make sure the USART is not currently sending or receiving data. 2) Disable
+    // the USART by writing a 0 to the Enable bit (0 may be written to the entire register). 3)
+    // Write the new configuration value, with the ENABLE bit set to 1.
+    obj->uart->CFG &= ~(1 << 0);
+
+    obj->uart->CFG = (1 << 0) // this will enable the usart
+                   | (data_bits << 2)
                    | (paritysel << 4)
                    | (stop_bits << 6);
 }