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application: include SWD utilities

This commit is contained in:
King Kévin 2021-03-10 14:15:04 +01:00
parent b80758c79c
commit db5e22a5b3
1 changed files with 47 additions and 4 deletions
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51
application.c
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@ -1,8 +1,8 @@
/** STM32F4 application example
/** SWJ (SWD + JTAG) finder
* @file
* @author King Kévin <kingkevin@cuvoodoo.info>
* @copyright SPDX-License-Identifier: GPL-3.0-or-later
* @date 2016-2020
* @date 2016-2021
*/
/* standard libraries */
@ -32,6 +32,7 @@
#include "usb_cdcacm.h" // USB CDC ACM utilities
#include "terminal.h" // handle the terminal interface
#include "menu.h" // menu utilities
#include "swd.h" // SWD utilities
/** watchdog period in ms */
#define WATCHDOG_PERIOD 10000
@ -69,6 +70,36 @@ size_t putc(char c)
// menu commands
static void command_swd_scan(void* argument)
{
(void)argument; // we won't use the argument
printf("SWD target DPIDR: ");
uint32_t data; // data to read/write over SWD
enum swd_ack_e ack; // SWD acknowledge response
swd_line_reset(); // put target in reset state
swd_jtag_to_swd(); // put target SWJ in SWD mode
swd_line_reset(); // put target in reset state
swd_idle_cycles(2); // idle before packer request
swd_packet_request(false, SWD_A_DP_DPIDR, true); // request DPIDR
swd_turnaround(1); // switch from writing to reading
ack = swd_acknowledge_response(); // get ack
if (SWD_ACK_OK != ack) {
printf("ack error\n");
return;
}
if (!swd_read(&data)) {
printf("parity error\n");
return;
}
swd_turnaround(1); // switch from reading to writing
printf("0x%08x ", data);
if (data & 0x1) {
printf("(designer: %03x/%s, version: %u, part number: 0x%02x/%s, revision %u)\n", (data >> 1) & 0x3ff, swd_jep106_manufacturer((data >> 8) & 0x0f, (data >> 1) & 0x7f), (data >> 12) & 0x0f, (data >> 20) & 0xff, swd_dpidr_partno((data >> 1) & 0x3ff, (data >> 20) & 0xff), (data >> 28) & 0x0f);
} else {
printf("(invalid: RAO != 1)\n");
}
}
/** display available commands
* @param[in] argument no argument required
*/
@ -305,7 +336,7 @@ static const struct menu_command_t menu_commands[] = {
.command_handler = &command_reset,
},
{
.shortcut = 's',
.shortcut = 'S',
.name = "system",
.command_description = "reboot into system memory",
.argument = MENU_ARGUMENT_NONE,
@ -320,6 +351,14 @@ static const struct menu_command_t menu_commands[] = {
.argument_description = NULL,
.command_handler = &command_bootloader,
},
{
.shortcut = 's',
.name = "scan",
.command_description = "scan SWD device",
.argument = MENU_ARGUMENT_NONE,
.argument_description = NULL,
.command_handler = &command_swd_scan,
},
};
static void command_help(void* argument)
@ -374,7 +413,7 @@ void main(void)
board_setup(); // setup board
uart_setup(); // setup USART (for printing)
usb_cdcacm_setup(); // setup USB CDC ACM (for printing)
puts("\nwelcome to the CuVoodoo STM32F4 example firmware\n"); // print welcome message
puts("\nwelcome to the CuVoodoo SWJ finder\n"); // print welcome message
#if DEBUG
// show reset cause
@ -454,6 +493,10 @@ void main(void)
// important: do not re-enable backup_domain_write_protect, since this will prevent clearing flags (but RTC registers do not need to be unlocked)
puts("OK\n");
puts("setup SWD: ");
swd_setup(100000); // setup SWD clock to 100 KHz, slow enough for any target and loose connection
puts("OK\n");
// setup terminal
terminal_prefix = ""; // set default prefix
terminal_process = &process_command; // set central function to process commands