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Add volatile qualifier (#1283)

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Add volatile qualifier

This is needed to ensure that the memory mapped address it always read.

Signed-off-by: Gaurav Aggarwal <aggarg@amazon.com>
This commit is contained in:
Gaurav-Aggarwal-AWS 2024-10-17 11:08:16 +05:30 • committed by GitHub
parent b3e6cff1f2
commit 28a20d5a69
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GPG key ID: B5690EEEBB952194
2 changed files with 4 additions and 3 deletions
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1
.gitignore vendored
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@ -11,6 +11,7 @@
[Oo]bj/ [Oo]bj/
[Ll]og/ [Ll]og/
[Ll]ogs/ [Ll]ogs/
[Bb]uild/
# CodeWarrior temporary files # CodeWarrior temporary files
*.tdt *.tdt

6
FreeRTOS/Demo/RISC-V-Qemu-virt_GCC/ns16550.c
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@ -20,7 +20,7 @@
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
* *
* https://www.FreeRTOS.org * https://www.FreeRTOS.org
* https://www.github.com/FreeRTOS * https://github.com/FreeRTOS
* *
*/ */
@ -54,12 +54,12 @@
static uint8_t readb( uintptr_t addr ) static uint8_t readb( uintptr_t addr )
{ {
return *( (uint8_t *) addr ); return *( (volatile uint8_t *) addr );
} }
static void writeb( uint8_t b, uintptr_t addr ) static void writeb( uint8_t b, uintptr_t addr )
{ {
*( (uint8_t *) addr ) = b; *( (volatile uint8_t *) addr ) = b;
} }
void vOutNS16550( struct device *dev, unsigned char c ) void vOutNS16550( struct device *dev, unsigned char c )