application: improve MCU identification
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@ -34,6 +34,7 @@
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#include "usb_cdcacm.h" // USB CDC ACM utilities
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#include "terminal.h" // handle the terminal interface
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#include "menu.h" // menu utilities
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#include "flash_internal.h" // flash utilities
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/** watchdog period in ms */
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#define WATCHDOG_PERIOD 10000
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@ -188,25 +189,46 @@ static void command_version(void* argument)
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(void)argument; // we won't use the argument
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printf("firmware date: %04u-%02u-%02u\n", BUILD_YEAR, BUILD_MONTH, BUILD_DAY); // show firmware build date
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// show flash size
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puts("flash size: ");
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puts("MCU advertised flash size: ");
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if (0xffff == DESIG_FLASH_SIZE) {
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puts("unknown (probably a defective micro-controller\n");
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puts("unknown (probably a counterfeit/defective micro-controller\n");
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} else {
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printf("%u KB\n", DESIG_FLASH_SIZE);
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}
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if ((uint32_t)&__flash_end >= FLASH_BASE) {
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printf("linker advertised flash size: %u KB\n", ((uint32_t)&__flash_end - FLASH_BASE) / 1024);
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}
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uint32_t flash_size = flash_internal_probe_read_size();
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printf("readable flash size: %u bytes (%u KB)\n", flash_size, flash_size / 1024);
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flash_size = flash_internal_probe_write_size();
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printf("writable flash size: %u bytes (%u KB)\n", flash_size, flash_size / 1024);
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const uint16_t dev_id = DBGMCU_IDCODE & DBGMCU_IDCODE_DEV_ID_MASK;
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const uint16_t rev_id = DBGMCU_IDCODE >> 16;
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printf("MCUID: DEV_ID=0x%03x REV_ID=0x%04x\n", dev_id, rev_id);
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// display device identity
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printf("device id: %08x%08x%04x%04x\n", DESIG_UNIQUE_ID2, DESIG_UNIQUE_ID1, DESIG_UNIQUE_ID0 & 0xffff, DESIG_UNIQUE_ID0 >> 16);
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char* unreadable;
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if (0 == DBGMCU_IDCODE && 0 == (SCS_DHCSR & SCS_DHCSR_C_DEBUGEN)) {
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unreadable = " (not readable, retry with debug attached)";
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} else if (0x307 == DBGMCU_IDCODE && (SCS_DHCSR & SCS_DHCSR_C_DEBUGEN)) {
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unreadable = " (erroneous reading, read over debug first)";
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} else {
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unreadable = "";
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}
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printf("MCU id code: %+08x (DEV_ID=0x%03x REV_ID=0x%04x)%s\n", DBGMCU_IDCODE, dev_id, rev_id, unreadable); // see below for details
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printf("device id: %08x%08x%04x%04x\n", DESIG_UNIQUE_ID2, DESIG_UNIQUE_ID1, DESIG_UNIQUE_ID0 & 0xffff, DESIG_UNIQUE_ID0 >> 16); // not that the half-works are reversed in the first word
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//printf("SCS_DHCSR: %+08x, DEBUGEN: %u\n", SCS_DHCSR, SCS_DHCSR & SCS_DHCSR_C_DEBUGEN);
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// SCS_DHCSR: 0x03010000, DEBUGEN: 0 debug not attached
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// SCS_DHCSR: 0x01010001, DEBUGEN: 1 debug attached
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#if DEBUG
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bool fake = false; // if details indicate it's not an STM32
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puts("chip family: ");
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switch (dev_id) {
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case 0: // DBGMCU_IDCODE is only accessible in debug mode (this is a known issue documented in STM32F10xxC/D/E Errata sheet, without workaround)
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case 0: // DBGMCU_IDCODE is only accessible in debug mode (this is a known issue documented in STM32F10xx8/B and STM32F10xxC/D/E Errata sheet, without workaround) (CKS32F103 is not affected by this issue)
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puts("not readable, retry with debug attached");
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break;
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// from RM0008 STM32F101xx, STM32F102xx, STM32F103xx, STM32F105xx and STM32F107xx
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case 0x307: // this is completely undocumented (even in the errata), but even with debug attached, DBGMCU_IDCODE = 0x00000307, until the DBGMCU_IDCODE is read over SWJ, only then it's correct. but the JEP106 ID part number is always right (with same meaning). this has been seen on a genuine STM32F103C8T6 (AFAICS)
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puts("erroneous reading, read over debug first");
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break;
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case 0x412:
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puts("STM32F10x low-density");
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break;
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@ -220,7 +242,7 @@ static void command_version(void* argument)
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puts("STM32F10x XL-density");
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break;
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case 0x418:
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puts("STM32F10xconnectivity");
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puts("STM32F10x connectivity");
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break;
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// from RM0091 STM32F0x8
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case 0x444:
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@ -324,7 +346,7 @@ static void command_version(void* argument)
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}
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putc('\n');
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// from RM0091 STM32F0x8 reference manual (not sure if it applies to F1)
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puts("manufacturing information:\n");
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puts("manufacturing information (STM32F0x8 schema):\n");
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printf("- X,Y wafer coordinate: %08x\n", DESIG_UNIQUE_ID0);
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printf("- lot number: %c%c%c%c%c%c%c\n", DESIG_UNIQUE_ID2 >> 24, DESIG_UNIQUE_ID2 >> 16, DESIG_UNIQUE_ID2 >> 8, DESIG_UNIQUE_ID2 >> 0, DESIG_UNIQUE_ID1 >> 24, DESIG_UNIQUE_ID1 >> 16, DESIG_UNIQUE_ID1 >> 8);
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printf("- wafer number: %u\n", DESIG_UNIQUE_ID1 & 0xff);
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@ -354,16 +376,16 @@ static void command_version(void* argument)
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puts("Cortex-M0+");
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break;
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case 0xC20:
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puts("Cortex‑M0");
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puts("Cortex-M0");
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break;
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case 0xC23: // the ARM spec actually mentions 0xC24
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puts("Cortex‑M3");
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puts("Cortex-M3");
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break;
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case 0xC24:
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puts("Cortex‑M4");
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puts("Cortex-M4");
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break;
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case 0xC27:
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puts("Cortex‑M7");
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puts("Cortex-M7");
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break;
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default:
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fake = true;
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@ -390,23 +412,25 @@ static void command_version(void* argument)
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}
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printf(" (cont.=%u, ID=0x%02x), part=0x%03x\n", jep106_continuation, jep106_identification, pidr_partno);
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// guess the micro-controller
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char* mcu = "STM32"; // which MCU is identified
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puts("MCU: ");
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if (1 == cpuid_variant && 1 == cpuid_revision && 0 == jep106_continuation && 0x20 == jep106_identification) { // STM32 uses Cortex-M3 r1p1 and the right JEP106 ID
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puts("STM32");
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mcu = "STM32";
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} else if (2 == cpuid_variant && 1 == cpuid_revision && 7 == jep106_continuation && 0x51 == jep106_identification) { // GD32 uses Cortex-M3 r2p1 and the right JEP106 ID
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puts("GD32");
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mcu = "GD32";
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fake = true;
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} else if (2 == cpuid_variant && 1 == cpuid_revision && 4 == jep106_continuation && 0x3b == jep106_identification) { // GD32 uses Cortex-M3 r2p1 and ARM JEP106 ID
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puts("CS32");
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mcu = "CKS32";
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fake = true;
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} else {
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puts("unknown");
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mcu = "unknown";
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fake = true;
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}
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puts(mcu);
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putc('\n');
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// detect fake STM32
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if (0x412 == dev_id || 0x410 == dev_id || 0x414 == dev_id || 0x430 == dev_id || 0x418 == dev_id) { // STM32F10x
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// the original STM32F10x uses a Cortex-M3 r1p1
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// STM32F10x uses a Cortex-M3 r1p1
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if (0xC23 != cpuid_partno) { // Cortex-M3
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fake = true;
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}
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@ -417,7 +441,12 @@ static void command_version(void* argument)
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fake = true;
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}
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}
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printf("this %s to be a genuine STM32\n", fake ? "does not seem" : "seems");
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if (0 != DBGMCU_IDCODE && 0 == (SCS_DHCSR & SCS_DHCSR_C_DEBUGEN)) { // STM32 can't read the MCU ID without debug attached (see errata). CKS32 is not affected by this issue
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fake = true;
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}
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if (0 == strcmp(mcu, "STM32")) {
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printf("this %s to be a genuine STM32\n", fake ? "does not seem" : "seems");
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}
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#endif
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}
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