implement flashing-side of the DFU state machine
the USB-side state machine currently sets the length to 0, preventing the actual flashing to be tested Change-Id: I5ed9cc2a22ed5e41bb59a3ce3f21ab098cec48e7
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dd3269b421
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usb_start.c
86
usb_start.c
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@ -45,15 +45,20 @@ static const usb_dfu_func_desc_t* usb_dfu_func_desc = (usb_dfu_func_desc_t*)&usb
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/** Ctrl endpoint buffer */
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static uint8_t ctrl_buffer[64];
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/** Application address in the flash
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(
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* It comes after the bootloader.
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* The NVMCTRL allows to reserve space at the beginning of the flash for the bootloader, but only in multiples of 8192 bytes.
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* The binary just with the USB stack already uses 8 kB, we reserve 16 kB for the bootloader (giving use a bit of margin for future fixes).
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*/
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#define APPLICATION_ADDR (8192*2)
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/**
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* \brief USB DFU Init
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*/
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void usb_dfu_init(void)
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{
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/* usb stack init */
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usbdc_init(ctrl_buffer);
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/* usbdc_register_funcion inside */
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dfudf_init();
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usbdc_start(single_desc);
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@ -61,27 +66,74 @@ void usb_dfu_init(void)
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}
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/**
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* Example of using CDC ACM Function.
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* \note
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* In this example, we will use a PC as a USB host:
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* - Connect the DEBUG USB on XPLAINED board to PC for program download.
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* - Connect the TARGET USB on XPLAINED board to PC for running program.
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* The application will behave as a virtual COM.
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* - Open a HyperTerminal or other COM tools in PC side.
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* - Send out a character or string and it will echo the content received.
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* \brief reset device
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*/
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static void usb_dfu_reset(const enum usb_event ev, const uint32_t param)
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{
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(void)param; // not used
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switch (ev) {
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case USB_EV_RESET:
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usbdc_detach(); // make sure we are detached
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NVIC_SystemReset(); // initiate a system reset
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break;
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default:
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break;
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}
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}
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/**
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* \brief Enter USB DFU runtime
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*/
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void usb_dfu(void)
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{
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while (!dfudf_is_enabled()) {
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// wait DFU to be installed
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};
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while (1) {
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while (!dfudf_is_enabled()); // wait for DFU to be installed
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gpio_set_pin_level(LED_SYSTEM, false); // switch LED on to indicate USB DFU stack is ready
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while (true) { // main DFU infinite loop
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// run the second part of the USB DFU state machine handling non-USB aspects
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if (USB_DFU_STATE_DFU_DNLOAD_SYNC == dfu_state || USB_DFU_STATE_DFU_DNBUSY == dfu_state) { // there is some data to be flashed
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gpio_set_pin_level(LED_SYSTEM, true); // switch LED off to indicate we are flashing
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if (dfu_download_length > 0) { // there is some data to be flashed
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int32_t rc = flash_write(&FLASH_0, APPLICATION_ADDR + dfu_download_progress, dfu_download_data, dfu_download_length); // write downloaded data chunk to flash
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if (ERR_NONE == rc) {
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dfu_state = USB_DFU_STATE_DFU_DNLOAD_IDLE; // indicate flashing this block has been completed
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} else { // there has been a programming error
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dfu_state = USB_DFU_STATE_DFU_ERROR;
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if (ERR_BAD_ADDRESS == rc) {
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dfu_status = USB_DFU_STATUS_ERR_ADDRESS;
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} else if (ERR_DENIED == rc) {
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dfu_status = USB_DFU_STATUS_ERR_WRITE;
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} else {
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dfu_status = USB_DFU_STATUS_ERR_PROG;
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}
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}
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} else { // there was no data to flash
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// this case should not happen, but it's not a critical error
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dfu_state = USB_DFU_STATE_DFU_DNLOAD_IDLE; // indicate flashing can continue
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}
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gpio_set_pin_level(LED_SYSTEM, false); // switch LED on to indicate USB DFU can resume
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}
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if (USB_DFU_STATE_DFU_MANIFEST == dfu_state) { // we can start manifestation (finish flashing)
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// in theory every DFU files should have a suffix to with a CRC to check the data
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// in practice most downloaded files are just the raw binary with DFU suffix
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dfu_manifestation_complete = true; // we completed flashing and all checks
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if (usb_dfu_func_desc->bmAttributes & USB_DFU_ATTRIBUTES_MANIFEST_TOLERANT) {
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dfu_state = USB_DFU_STATE_DFU_MANIFEST_SYNC;
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} else {
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dfu_state = USB_DFU_STATE_DFU_MANIFEST_WAIT_RESET;
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}
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}
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if (USB_DFU_STATE_DFU_MANIFEST_WAIT_RESET == dfu_state) {
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if (usb_dfu_func_desc->bmAttributes & USB_DFU_ATTRIBUTES_WILL_DETACH) {
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usb_dfu_reset(USB_EV_RESET, 0); // immediately reset
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} else { // wait for USB reset
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usb_d_register_callback(USB_D_CB_EVENT, (FUNC_PTR)usb_dfu_reset); // register new USB reset event handler
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}
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}
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}
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}
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void usb_init(void)
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{
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usb_dfu_init();
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}
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