static void udd_ctrl_setup_received(void)
{
irqflags_t flags;
if (UDD_EPCTRL_SETUP != udd_ep_control_state) {
// May be a hidden DATA or ZLP phase
// or protocol abort
udd_ctrl_endofrequest();
// Reinitializes control endpoint management
udd_ctrl_init();
}
// Fill setup request structure
if (8 != udd_udesc_get_buf0_ctn(0)) {
udd_ctrl_stall_data();
udd_ack_setup_received(0);
return; // Error data number doesn't correspond to SETUP packet
}
memcpy((uint8_t *) & udd_g_ctrlreq.req, udd_ctrl_buffer, 8);
// Manage LSB/MSB to fit with CPU usage
udd_g_ctrlreq.req.wValue = le16_to_cpu(udd_g_ctrlreq.req.wValue);
udd_g_ctrlreq.req.wIndex = le16_to_cpu(udd_g_ctrlreq.req.wIndex);
udd_g_ctrlreq.req.wLength = le16_to_cpu(udd_g_ctrlreq.req.wLength);
// Decode setup request
if (udc_process_setup() == false) {
// Setup request unknown then stall it
udd_ctrl_stall_data();
udd_ack_setup_received(0);
return;
}
udd_ack_setup_received(0);
if (Udd_setup_is_in()) {
// IN data phase requested
udd_ctrl_prev_payload_nb_trans = 0;
udd_ctrl_payload_nb_trans = 0;
udd_ep_control_state = UDD_EPCTRL_DATA_IN;
udd_ctrl_in_sent(); // Send first data transfer
} else {
if (0 == udd_g_ctrlreq.req.wLength) {
// No data phase requested
// Send IN ZLP to ACK setup request
udd_ctrl_send_zlp_in();
return;
}
// OUT data phase requested
udd_ctrl_prev_payload_nb_trans = 0;
udd_ctrl_payload_nb_trans = 0;
udd_ep_control_state = UDD_EPCTRL_DATA_OUT;
// To detect a protocol error, enable nak interrupt on data IN phase
udd_ack_nak_in(0);
flags = cpu_irq_save();
udd_enable_nak_in_interrupt(0);
cpu_irq_restore(flags);
}
}
static void udd_ctrl_setup_received(void)
{
uint8_t i;
if (UDD_EPCTRL_SETUP != udd_ep_control_state) {
// May be a hidden DATA or ZLP phase
// or protocol abort
udd_ctrl_endofrequest();
// Reinitializes control endpoint management
udd_ctrl_init();
}
// Fill setup request structure
if (8 != udd_byte_count(0)) {
udd_ack_setup_received(0);
udd_ctrl_stall_data();
return; // Error data number doesn't correspond to SETUP packet
}
for (i = 0; i < 8; i++) {
((uint8_t *) & udd_g_ctrlreq.req)[i] =
udd_endpoint_fifo_read(0);
}
// Manage LSB/MSB to fit with CPU usage
udd_g_ctrlreq.req.wValue = le16_to_cpu(udd_g_ctrlreq.req.wValue);
udd_g_ctrlreq.req.wIndex = le16_to_cpu(udd_g_ctrlreq.req.wIndex);
udd_g_ctrlreq.req.wLength = le16_to_cpu(udd_g_ctrlreq.req.wLength);
// Decode setup request
if (udc_process_setup() == false) {
// Setup request unknown then stall it
udd_ack_setup_received(0);
udd_ctrl_stall_data();
return;
}
if (Udd_setup_is_in()) {
// Set DIR
udd_set_endpoint_direction_in(0);
udd_ack_setup_received(0);
// IN data phase requested
udd_ctrl_prev_payload_nb_trans = 0;
udd_ctrl_payload_nb_trans = 0;
udd_ep_control_state = UDD_EPCTRL_DATA_IN;
udd_ctrl_in_sent(); // Send first data transfer
} else {
udd_ack_setup_received(0);
if (0 == udd_g_ctrlreq.req.wLength) {
// No data phase requested
// Send IN ZLP to ACK setup request
udd_ctrl_send_zlp_in();
return;
}
// OUT data phase requested
udd_ctrl_prev_payload_nb_trans = 0;
udd_ctrl_payload_nb_trans = 0;
udd_ep_control_state = UDD_EPCTRL_DATA_OUT;
}
}
static void udd_ctrl_in_sent(void)
{
static bool b_shortpacket = false;
uint16_t nb_remain;
if (UDD_EPCTRL_HANDSHAKE_WAIT_IN_ZLP == udd_ep_control_state) {
// ZLP on IN is sent, then valid end of setup request
udd_ctrl_endofrequest();
// Reinitializes control endpoint management
udd_ctrl_init();
return;
}
Assert(udd_ep_control_state == UDD_EPCTRL_DATA_IN);
nb_remain = udd_g_ctrlreq.payload_size - udd_ctrl_payload_nb_trans;
if (0 == nb_remain) {
// Update number of total data sending by previous playload buffer
udd_ctrl_prev_payload_nb_trans += udd_ctrl_payload_nb_trans;
if ((udd_g_ctrlreq.req.wLength == udd_ctrl_prev_payload_nb_trans)
|| b_shortpacket) {
// All data requested are transfered or a short packet has been sent
// then it is the end of data phase.
// Generate an OUT ZLP for handshake phase.
udd_ctrl_send_zlp_out();
return;
}
// Need of new buffer because the data phase is not complete
if ((!udd_g_ctrlreq.over_under_run)
|| (!udd_g_ctrlreq.over_under_run())) {
// Underrun then send zlp on IN
// nb_remain == 0 allows to send a IN ZLP
} else {
// A new payload buffer is given
udd_ctrl_payload_nb_trans = 0;
nb_remain = udd_g_ctrlreq.payload_size;
}
}
// Continue transfer an send next data
if (nb_remain >= USB_DEVICE_EP_CTRL_SIZE) {
nb_remain = USB_DEVICE_EP_CTRL_SIZE;
b_shortpacket = false;
} else {
b_shortpacket = true;
}
udd_control_in_set_bytecnt(nb_remain);
// Link payload buffer directly on USB hardware
udd_control_in_set_buf(udd_g_ctrlreq.payload + udd_ctrl_payload_nb_trans);
udd_ctrl_payload_nb_trans += nb_remain;
// Valid and sent the data available in control endpoint buffer
udd_control_in_clear_NACK0();
}
static void udd_ctrl_setup_received(void)
{
if (UDD_EPCTRL_SETUP != udd_ep_control_state) {
if ((UDD_EPCTRL_HANDSHAKE_WAIT_IN_ZLP == udd_ep_control_state)
|| (UDD_EPCTRL_HANDSHAKE_WAIT_OUT_ZLP == udd_ep_control_state)) {
// Accept that ZLP event can be hidden by setup packet event
// in case of setup packet sending quickly after a ZLP
udd_ctrl_endofrequest();
}
// Reinitializes control endpoint management
udd_ctrl_init();
}
// Fill setup request structure
if (8 != udd_control_out_get_bytecnt())
return; // Error data number don't correspond to SETUP packet
memcpy((uint8_t *) & udd_g_ctrlreq.req, udd_ctrl_buffer, 8);
// To detect a protocol error on setup, enable nak interrupt on IN/OUT of control endpoint
udd_enable_overflow_interrupt();
udd_enable_underflow_interrupt();
// Decode setup request
if (udc_process_setup() == false) {
// Setup request unknown then stall it
udd_ctrl_stall_data();
return;
}
if (Udd_setup_is_in()) {
udd_ctrl_prev_payload_nb_trans = 0;
udd_ctrl_payload_nb_trans = 0;
udd_ep_control_state = UDD_EPCTRL_DATA_IN;
udd_ctrl_in_sent(); // Send first data transfer
} else {
if (0 == udd_g_ctrlreq.req.wLength) {
// No data phase requested
// Send IN ZLP to ACK setup request
udd_ctrl_send_zlp_in();
return;
}
// OUT data phase requested
udd_ctrl_prev_payload_nb_trans = 0;
udd_ctrl_payload_nb_trans = 0;
udd_ep_control_state = UDD_EPCTRL_DATA_OUT;
// Clear packet to receive first packet
udd_control_out_clear_NACK0();
udd_control_out_ack_tc();
}
}
static void udd_ctrl_out_received(void)
{
irqflags_t flags;
uint8_t i;
uint16_t nb_data;
if (UDD_EPCTRL_DATA_OUT != udd_ep_control_state) {
if ((UDD_EPCTRL_DATA_IN == udd_ep_control_state)
|| (UDD_EPCTRL_HANDSHAKE_WAIT_OUT_ZLP ==
udd_ep_control_state)) {
// End of SETUP request:
// - Data IN Phase aborted,
// - or last Data IN Phase hidden by ZLP OUT sending quickly,
// - or ZLP OUT received normally.
udd_ctrl_endofrequest();
} else {
// Protocol error during SETUP request
udd_ctrl_stall_data();
}
// Reinitializes control endpoint management
udd_ctrl_init();
return;
}
// Read data received during OUT phase
nb_data = udd_byte_count(0);
if (udd_g_ctrlreq.payload_size < (udd_ctrl_payload_nb_trans + nb_data)) {
// Payload buffer too small
nb_data = udd_g_ctrlreq.payload_size -
udd_ctrl_payload_nb_trans;
}
uint8_t *ptr_src = (uint8_t *) & udd_get_endpoint_fifo_access(0, 8);
uint8_t *ptr_dest = udd_g_ctrlreq.payload + udd_ctrl_payload_nb_trans;
for (i = 0; i < nb_data; i++) {
*ptr_dest++ = *ptr_src++;
}
udd_ctrl_payload_nb_trans += nb_data;
if ((USB_DEVICE_EP_CTRL_SIZE != nb_data)
|| (udd_g_ctrlreq.req.wLength <=
(udd_ctrl_prev_payload_nb_trans +
udd_ctrl_payload_nb_trans)))
{
// End of reception because it is a short packet
// Before send ZLP, call intermediate callback
// in case of data receive generate a stall
udd_g_ctrlreq.payload_size = udd_ctrl_payload_nb_trans;
if (NULL != udd_g_ctrlreq.over_under_run) {
if (!udd_g_ctrlreq.over_under_run()) {
// Stall ZLP
udd_ctrl_stall_data();
// Ack reception of OUT to replace NAK by a STALL
udd_ack_out_received(0);
return;
}
}
// Send IN ZLP to ACK setup request
udd_ack_out_received(0);
udd_ctrl_send_zlp_in();
return;
}
if (udd_g_ctrlreq.payload_size == udd_ctrl_payload_nb_trans) {
// Overrun then request a new payload buffer
if (!udd_g_ctrlreq.over_under_run) {
// No callback available to request a new payload buffer
udd_ctrl_stall_data();
// Ack reception of OUT to replace NAK by a STALL
udd_ack_out_received(0);
return;
}
if (!udd_g_ctrlreq.over_under_run()) {
// No new payload buffer delivered
udd_ctrl_stall_data();
// Ack reception of OUT to replace NAK by a STALL
udd_ack_out_received(0);
return;
}
// New payload buffer available
// Update number of total data received
udd_ctrl_prev_payload_nb_trans += udd_ctrl_payload_nb_trans;
// Reinit reception on payload buffer
udd_ctrl_payload_nb_trans = 0;
}
// Free buffer of control endpoint to authorize next reception
udd_ack_out_received(0);
// To detect a protocol error, enable nak interrupt on data IN phase
udd_ack_nak_in(0);
flags = cpu_irq_save();
udd_enable_nak_in_interrupt(0);
cpu_irq_restore(flags);
}
static void udd_ctrl_in_sent(void)
{
static bool b_shortpacket = false;
uint16_t nb_remain;
uint8_t i;
uint8_t *ptr_dest, *ptr_src;
irqflags_t flags;
flags = cpu_irq_save();
udd_disable_in_send_interrupt(0);
cpu_irq_restore(flags);
if (UDD_EPCTRL_HANDSHAKE_WAIT_IN_ZLP == udd_ep_control_state) {
// ZLP on IN is sent, then valid end of setup request
udd_ctrl_endofrequest();
// Reinitializes control endpoint management
udd_ctrl_init();
return;
}
Assert(udd_ep_control_state == UDD_EPCTRL_DATA_IN);
nb_remain = udd_g_ctrlreq.payload_size - udd_ctrl_payload_nb_trans;
if (0 == nb_remain) {
// All content of current buffer payload are sent
// Update number of total data sending by previous payload buffer
udd_ctrl_prev_payload_nb_trans += udd_ctrl_payload_nb_trans;
if ((udd_g_ctrlreq.req.wLength == udd_ctrl_prev_payload_nb_trans)
|| b_shortpacket) {
// All data requested are transfered or a short packet has been sent
// then it is the end of data phase.
// Generate an OUT ZLP for handshake phase.
udd_ctrl_send_zlp_out();
return;
}
// Need of new buffer because the data phase is not complete
if ((!udd_g_ctrlreq.over_under_run)
|| (!udd_g_ctrlreq.over_under_run())) {
// Underrun then send zlp on IN
// Here nb_remain=0 and allows to send a IN ZLP
} else {
// A new payload buffer is given
udd_ctrl_payload_nb_trans = 0;
nb_remain = udd_g_ctrlreq.payload_size;
}
}
// Continue transfer and send next data
if (nb_remain >= USB_DEVICE_EP_CTRL_SIZE) {
nb_remain = USB_DEVICE_EP_CTRL_SIZE;
b_shortpacket = false;
} else {
b_shortpacket = true;
}
// Fill buffer of endpoint control
ptr_dest = (uint8_t *) & udd_get_endpoint_fifo_access(0, 8);
ptr_src = udd_g_ctrlreq.payload + udd_ctrl_payload_nb_trans;
//** Critical section
// Only in case of DATA IN phase abort without USB Reset signal after.
// The IN data don't must be written in endpoint 0 DPRAM during
// a next setup reception in same endpoint 0 DPRAM.
// Thereby, an OUT ZLP reception must check before IN data write
// and if no OUT ZLP is received the data must be written quickly (800us)
// before an eventually ZLP OUT and SETUP reception
flags = cpu_irq_save();
if (Is_udd_out_received(0)) {
// IN DATA phase aborted by OUT ZLP
cpu_irq_restore(flags);
udd_ep_control_state = UDD_EPCTRL_HANDSHAKE_WAIT_OUT_ZLP;
return; // Exit of IN DATA phase
}
// Write quickly the IN data
for (i = 0; i < nb_remain; i++) {
*ptr_dest++ = *ptr_src++;
}
udd_ctrl_payload_nb_trans += nb_remain;
// Validate and send the data available in the control endpoint buffer
udd_ack_in_send(0);
udd_enable_in_send_interrupt(0);
// In case of abort of DATA IN phase, no need to enable nak OUT interrupt
// because OUT endpoint is already free and ZLP OUT accepted.
cpu_irq_restore(flags);
}
static void udd_ctrl_setup_received(void)
{
irqflags_t flags;
uint8_t i;
if (UDD_EPCTRL_SETUP != udd_ep_control_state) {
// May be a hidden DATA or ZLP phase
// or protocol abort
udd_ctrl_endofrequest();
// Reinitializes control endpoint management
udd_ctrl_init();
}
// Fill setup request structure
if (8 != udd_byte_count(0)) {
udd_ctrl_stall_data();
udd_ack_setup_received(0);
return; // Error data number doesn't correspond to SETUP packet
}
uint32_t *ptr = (uint32_t *) & udd_get_endpoint_fifo_access(0, 32);
for (i = 0; i < 8 / 4; i++) {
((uint32_t *) & udd_g_ctrlreq.req)[i] = *ptr++;
}
// Manage LSB/MSB to fit with CPU usage
udd_g_ctrlreq.req.wValue = le16_to_cpu(udd_g_ctrlreq.req.wValue);
udd_g_ctrlreq.req.wIndex = le16_to_cpu(udd_g_ctrlreq.req.wIndex);
udd_g_ctrlreq.req.wLength = le16_to_cpu(udd_g_ctrlreq.req.wLength);
// Decode setup request
if (udc_process_setup() == false) {
// Setup request unknow then stall it
udd_ctrl_stall_data();
udd_ack_setup_received(0);
return;
}
udd_ack_setup_received(0);
if (Udd_setup_is_in()) {
// Compute if an IN ZLP must be send after IN data
udd_ctrl_payload_need_in_zlp =
((udd_g_ctrlreq.payload_size %
USB_DEVICE_EP_CTRL_SIZE) == 0);
// IN data phase requested
udd_ctrl_prev_payload_nb_trans = 0;
udd_ctrl_payload_nb_trans = 0;
udd_ep_control_state = UDD_EPCTRL_DATA_IN;
udd_ctrl_in_sent(); // Send first data transfer
} else {
if (0 == udd_g_ctrlreq.req.wLength) {
// No data phase requested
// Send IN ZLP to ACK setup request
udd_ctrl_send_zlp_in();
return;
}
// OUT data phase requested
udd_ctrl_prev_payload_nb_trans = 0;
udd_ctrl_payload_nb_trans = 0;
udd_ep_control_state = UDD_EPCTRL_DATA_OUT;
// To detect a protocol error, enable nak interrupt on data IN phase
udd_ack_nak_in(0);
flags = cpu_irq_save();
udd_enable_nak_in_interrupt(0);
cpu_irq_restore(flags);
}
}
static void udd_ctrl_out_received(void)
{
uint16_t nb_data;
if (UDD_EPCTRL_HANDSHAKE_WAIT_OUT_ZLP == udd_ep_control_state) {
// Valid end of setup request
udd_ctrl_endofrequest();
// Reinitializes control endpoint management
udd_ctrl_init();
return;
}
Assert(udd_ep_control_state == UDD_EPCTRL_DATA_OUT);
// Read data received during OUT phase
nb_data = udd_control_out_get_bytecnt();
if (udd_g_ctrlreq.payload_size < (udd_ctrl_payload_nb_trans + nb_data)) {
// Payload buffer too small, ignore data remaining
nb_data = udd_g_ctrlreq.payload_size - udd_ctrl_payload_nb_trans;
}
memcpy((uint8_t *) (udd_g_ctrlreq.payload + udd_ctrl_payload_nb_trans),
udd_ctrl_buffer, nb_data);
udd_ctrl_payload_nb_trans += nb_data;
if ((USB_DEVICE_EP_CTRL_SIZE != nb_data) || (udd_g_ctrlreq.req.wLength
<= (udd_ctrl_prev_payload_nb_trans
+ udd_ctrl_payload_nb_trans))) {
// End of reception because it is a short packet
// or all data are transfered
// Before send ZLP, call intermediate callback
// in case of data receive generate a stall
udd_g_ctrlreq.payload_size = udd_ctrl_payload_nb_trans;
if (NULL != udd_g_ctrlreq.over_under_run) {
if (!udd_g_ctrlreq.over_under_run()) {
// Stall ZLP
udd_ctrl_stall_data();
return;
}
}
// Send IN ZLP to ACK setup request
udd_ctrl_send_zlp_in();
return;
}
if (udd_g_ctrlreq.payload_size == udd_ctrl_payload_nb_trans) {
// Overrun then request a new payload buffer
if (!udd_g_ctrlreq.over_under_run) {
// No callback available to request a new payload buffer
udd_ctrl_stall_data();
return;
}
if (!udd_g_ctrlreq.over_under_run()) {
// No new payload buffer delivered
udd_ctrl_stall_data();
return;
}
// New payload buffer available
// Update number of total data received
udd_ctrl_prev_payload_nb_trans += udd_ctrl_payload_nb_trans;
// Reinit reception on payload buffer
udd_ctrl_payload_nb_trans = 0;
}
// Free buffer of OUT control endpoint to authorize next reception
udd_control_out_clear_NACK0();
}
static void udd_ctrl_in_sent(void)
{
uint16_t nb_remain;
irqflags_t flags;
flags = cpu_irq_save();
udd_disable_in_send_interrupt(0);
cpu_irq_restore(flags);
if (UDD_EPCTRL_HANDSHAKE_WAIT_IN_ZLP == udd_ep_control_state) {
// ZLP on IN is sent, then valid end of setup request
udd_ctrl_endofrequest();
// Reinitializes control endpoint management
udd_ctrl_init();
return;
}
Assert(udd_ep_control_state == UDD_EPCTRL_DATA_IN);
nb_remain = udd_g_ctrlreq.payload_size - udd_ctrl_payload_nb_trans;
if (0 == nb_remain) {
// All content of current buffer payload are sent
if (!udd_ctrl_payload_need_in_zlp) {
// It is the end of data phase, because the last data packet is a short packet
// then generate an OUT ZLP for handshake phase.
udd_ctrl_send_zlp_out();
return;
}
if ((udd_g_ctrlreq.req.wLength > (udd_ctrl_prev_payload_nb_trans
+
udd_g_ctrlreq.
payload_size))
|| (!udd_g_ctrlreq.over_under_run)
|| (!udd_g_ctrlreq.over_under_run())) {
// Underrun or data packet complette than send zlp on IN (note don't change DataToggle)
udd_ctrl_payload_need_in_zlp = false;
// nb_remain==0 allows to send a IN ZLP
} else {
// A new payload buffer is given
// Update number of total data sending by previous playlaod buffer
udd_ctrl_prev_payload_nb_trans +=
udd_ctrl_payload_nb_trans;
// Update maangement of current playoad transfer
udd_ctrl_payload_nb_trans = 0;
nb_remain = udd_g_ctrlreq.payload_size;
// Compute if an IN ZLP must be send after IN data
udd_ctrl_payload_need_in_zlp =
((udd_g_ctrlreq.payload_size %
USB_DEVICE_EP_CTRL_SIZE)
== 0);
}
}
// Continue transfer and send next data
if (nb_remain > USB_DEVICE_EP_CTRL_SIZE) {
nb_remain = USB_DEVICE_EP_CTRL_SIZE;
}
//** Critical section
// Only in case of DATA IN phase abort without USB Reset signal after.
// The IN data don't must be writed in endpoint 0 DPRAM during
// a next setup reception in same endpoint 0 DPRAM.
// Thereby, an OUT ZLP reception must check before IN data write
// and if no OUT ZLP is recevied the data must be written quickly (800us)
// before an eventually ZLP OUT and SETUP reception
flags = cpu_irq_save();
if (Is_udd_out_received(0)) {
// IN DATA phase aborted by OUT ZLP
cpu_irq_restore(flags);
udd_ep_control_state = UDD_EPCTRL_HANDSHAKE_WAIT_OUT_ZLP;
return; // Exit of IN DATA phase
}
// Write quickly the IN data
memcpy(udd_ctrl_buffer,
udd_g_ctrlreq.payload + udd_ctrl_payload_nb_trans,
nb_remain);
udd_ctrl_payload_nb_trans += nb_remain;
udd_udesc_set_buf0_ctn(0, nb_remain);
// Validate and send the data available in the control endpoint buffer
udd_ack_in_send(0);
udd_enable_in_send_interrupt(0);
// In case of abort of DATA IN phase, no need to enable nak OUT interrupt
// because OUT endpoint is already free and ZLP OUT accepted.
cpu_irq_restore(flags);
}
