From 460bd1e4774a28b3d71a2246d5c5d4495076597d Mon Sep 17 00:00:00 2001 From: Uwe Bonnes Date: Tue, 5 Oct 2021 15:32:46 +0200 Subject: [PATCH] stm32/gdb_if: Use _WFI when nothing to do. --- src/platforms/stm32/gdb_if.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/src/platforms/stm32/gdb_if.c b/src/platforms/stm32/gdb_if.c index ce534f0..87d3286 100644 --- a/src/platforms/stm32/gdb_if.c +++ b/src/platforms/stm32/gdb_if.c @@ -24,6 +24,7 @@ */ #include "general.h" #include "cdcacm.h" +#include #include "gdb_if.h" static uint32_t count_out; @@ -95,6 +96,8 @@ static void gdb_if_update_buf(void) buffer_out, CDCACM_PACKET_SIZE); out_ptr = 0; #endif + if (!count_out) + __WFI(); } unsigned char gdb_if_getchar(void) @@ -102,8 +105,10 @@ unsigned char gdb_if_getchar(void) while (!(out_ptr < count_out)) { /* Detach if port closed */ - if (!cdcacm_get_dtr()) + if (!cdcacm_get_dtr()) { + __WFI(); return 0x04; + } gdb_if_update_buf(); } @@ -118,8 +123,10 @@ unsigned char gdb_if_getchar_to(int timeout) if (!(out_ptr < count_out)) do { /* Detach if port closed */ - if (!cdcacm_get_dtr()) - return 0x04; + if (!cdcacm_get_dtr()) { + __WFI(); /* systick will wake up too!*/ + return 0x04; + } gdb_if_update_buf(); } while (!platform_timeout_is_expired(&t) && !(out_ptr < count_out));