Bring up the M0 & blink TX LED

firmware/common/LPC43xx_M4_memory.ld

@@ -34,3 +34,4 @@ MEMORY
 }
 
 usb_bulk_buffer = ORIGIN(ram_usb);
+PROVIDE(__ram_m0_start__ = ORIGIN(ram_m0));

firmware/hackrf_usb/CMakeLists.txt

@@ -63,6 +63,8 @@ set(SRC_M4
 	"${PATH_HACKRF_FIRMWARE_COMMON}/operacake.c"
 )
 
+set(SRC_M0 sgpio_m0.c)
+
 if(BOARD STREQUAL "HACKRF_ONE")
 	SET(SRC_M4
 		${SRC_M4}

firmware/hackrf_usb/hackrf_usb.c

@@ -22,7 +22,9 @@
 
 #include <stddef.h>
 
+#include <libopencm3/lpc43xx/ipc.h>
 #include <libopencm3/lpc43xx/m4/nvic.h>
+#include <libopencm3/lpc43xx/rgu.h>
 
 #include <streaming.h>
 
@@ -50,6 +52,10 @@
  
 #include "hackrf-ui.h"
 
+extern uint32_t __m0_start__;
+extern uint32_t __m0_end__;
+extern uint32_t __ram_m0_start__;
+
 static usb_request_handler_fn vendor_request_handler[] = {
 	NULL,
 	usb_vendor_request_set_transceiver_mode,
@@ -176,6 +182,16 @@ static bool cpld_jtag_sram_load(jtag_t* const jtag) {
 	return success;
 }
 
+static void m0_rom_to_ram() {
+	uint32_t *dest = &__ram_m0_start__;
+	uint32_t *src = &__m0_start__;
+	while (src < &__m0_end__) {
+		*dest = *src;
+		dest++;
+		src++;
+	}
+}
+
 int main(void) {
 	bool operacake_allow_gpio;
 	pin_setup();
@@ -188,6 +204,10 @@ int main(void) {
 #endif
 	cpu_clock_init();
 
+	/* Wake the M0 */
+	m0_rom_to_ram();
+	ipc_start_m0((uint32_t)&__ram_m0_start__);
+
 	if( !cpld_jtag_sram_load(&jtag_cpld) ) {
 		halt_and_flash(6000000);
 	}

firmware/hackrf_usb/sgpio_m0.c

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2020 Mike Walters <mike@flomp.net>
+ *
+ * This file is part of HackRF.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "gpio_lpc.h"
+
+int main() {
+	while(1) {
+		*(uint8_t*)0x400f4048 ^= 1;
+		for (volatile int i = 0; i < 10000000; i++) {}
+	}
+}