bluepillplus: Add chip detection of APM32F103

Author: ALTracer

src/platforms/bluepillplus/platform.c

@@ -162,6 +162,17 @@ static void platform_detect_variant(void)
 		}
 	}
 
+	if (device_id == 0x410 && cpu_id == 0xc230 && scb_cpuid == 0x412fc231U) {
+		/* APM32F103CB: 0x410 (Medium Density), 0x412fc231 (Cortex-M3 r2p1) */
+		if (romtable_cidr == 0xb105100dU && romtable_pidr == 0x04000bb4c3ULL) {
+			/* APM32F103: Manufacturer 43b Partno 4c3 (PIDR = 0x04000bb4c3) */
+			clock = &rcc_hse_config_hse8_96mhz;
+			rcc_periph_clock_disable(RCC_USB);
+			/* Set 96/2=48MHz USB divisor before enabling PLL */
+			rcc_set_usbpre_gd32f30x(RCC_CFGR_USBPRE_PLL_CLK_DIV2);
+		}
+	}
+
 	if (device_id == 0x410 && cpu_id == 0xc230 && scb_cpuid == 0x412fc231U) {
 		/* GD32F103CB: 0x410 (Medium density), 0x412fc231 (Cortex-M3 r2p1) */
 		if (romtable_cidr == 0xb105100dU && romtable_pidr == 0x07000d1f64ULL) {