[OpenOCD-commit] Main OpenOCD repository branch, master, updated. v0.12.0-303-g74325dc73

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commit 74325dc73d48eb9371fa9ba8d190c46d70abbce3
Author: Marcin Niestroj <m.n...@em...v>
Date:   Thu Aug 3 17:43:39 2023 +0200

    stlink: increase stlink v2 max speed to 2.25 Mbps
    
    stlink v2 on Nucleo-64 board (e.g. NUCLEO-L476RG) has target SWO signal
    connected to STM32F103CB'S PA10, which is UART1_RX. UART1 within this
    MCU in theory can be configured to 4.5 Mbps baudrate, which means this
    is the upper limit supported by HW. As a confirmation BMP (Black Magic
    Probe) project also states in documentation that UART1 can be used with
    up to 4.5 Mbps baudrate.
    
    Tests have shown that configuring 4.5 Mbps baudrate on stlink v2
    available on NUCLEO-L476RG board results in receiving corrupted data.
    Using 2.25 Mbps however allows to successfully receive all data from
    SWO. This makes sense in terms of STM32F103CB capabilities, since 2.25
    Mbps is the next supported baudrate due to division by 2.
    
    Increase supported stlink v2 SWO speed from 2 to 2.25 Mbps.
    
    Tested with NUCLEO-L476RG:
    
      $ stm32l4x.tpiu configure -protocol uart \
        -traceclk 80000000 -pin-freq 2250000 \
        -output /dev/stdout
      $ stm32l4x.tpiu enable
    
    2.25 Mbps speed confirmed with logic analyzer.
    
    Signed-off-by: Marcin Niestroj <m.n...@em...v>
    Change-Id: Icbec04585664aba8b217e8f9a75458e577f7617f
    Reviewed-on: https://review.openocd.org/c/openocd/+/7848
    Tested-by: jenkins
    Reviewed-by: Antonio Borneo <bor...@gm...>

diff --git a/src/jtag/drivers/stlink_usb.c b/src/jtag/drivers/stlink_usb.c
index 2c5b63dd6..c5326a206 100644
--- a/src/jtag/drivers/stlink_usb.c
+++ b/src/jtag/drivers/stlink_usb.c
@@ -456,7 +456,7 @@ static inline int stlink_usb_xfer_noerrcheck(void *handle, const uint8_t *buf, i
 #define STLINK_DEBUG_PORT_ACCESS            0xffff
 
 #define STLINK_TRACE_SIZE               4096
-#define STLINK_TRACE_MAX_HZ             2000000
+#define STLINK_TRACE_MAX_HZ             2250000
 #define STLINK_V3_TRACE_MAX_HZ          24000000
 
 #define STLINK_V3_MAX_FREQ_NB               10

-----------------------------------------------------------------------

Summary of changes:
 src/jtag/drivers/stlink_usb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)


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