Merge pull request #35 from kienvo/usb

feat: Receive data over USB

1 files changed, 132 insertions, 0 deletions

diff --git a/src/usb/setup.c b/src/usb/setup.c
new file mode 100644
index 0000000..d53c318
--- /dev/null
+++ b/src/usb/setup.c
@@ -0,0 +1,132 @@
+#include <stdlib.h>
+
+#include "CH58x_common.h"
+
+#include "utils.h"
+
+uint8_t *cfg_desc;
+
+// FIXME: here wasting 1KiB of ram
+void (*if_handlers[256])(USB_SETUP_REQ *request);
+void (*ep_handlers[7])();
+
+/* Configuration Descriptor template */
+USB_CFG_DESCR cfg_static = {
+	.bLength = sizeof(USB_CFG_DESCR),
+	.bDescriptorType = 0x02,
+	.wTotalLength = sizeof(USB_CFG_DESCR), // will be updated on cfg_desc_add()
+	.bNumInterfaces = 0, // will be updated on cfg_desc_add()
+	.bConfigurationValue = 0x01,
+	.iConfiguration = 4,
+	.bmAttributes = 0xA0,
+	.MaxPower = 50 // mA
+};
+
+void cfg_desc_append(void *desc)
+{
+	uint8_t cfg_len = 0;
+	uint8_t len = ((uint8_t *)desc)[0];
+	if (cfg_desc) // attempting to add a non-Configuration Descriptor
+		cfg_len = ((USB_CFG_DESCR *)cfg_desc)->wTotalLength;
+	uint8_t newlen = cfg_len + len;
+
+	cfg_desc = realloc(cfg_desc, newlen); // TODO: add a safe check here
+
+	memcpy(cfg_desc + cfg_len, desc, len);
+
+	((USB_CFG_DESCR *)cfg_desc)->wTotalLength = newlen;
+	((USB_CFG_DESCR *)cfg_desc)->bNumInterfaces += ((uint8_t *)desc)[1] == 0x04;
+}
+
+int ep_cb_register(int ep_num, void (*cb)())
+{
+	if (ep_num > 8)
+		return -1;
+	if (ep_handlers[ep_num]) // already registerd
+		return -1;
+
+	ep_handlers[ep_num] = cb;
+	return 0;
+}
+
+int if_cb_register(uint8_t if_num, void (*cb)(USB_SETUP_REQ *request))
+{
+	if (if_handlers[if_num]) // already registered
+		return -1;
+
+	if_handlers[if_num] = cb;
+	return 0;
+}
+
+void dma_register(uint8_t ep_num, void *buf)
+{
+	if (ep_num > 7) // CH582 support only 8 endpoint
+		return;
+
+	volatile uint16_t *p_regs[] = {
+		&R16_UEP0_DMA,
+		&R16_UEP1_DMA,
+		&R16_UEP2_DMA,
+		&R16_UEP3_DMA,
+		NULL,
+		&R16_UEP5_DMA,
+		&R16_UEP6_DMA,
+		&R16_UEP7_DMA,
+	};
+	volatile uint8_t *ctrl_regs[] = {
+		&R8_UEP0_CTRL,
+		&R8_UEP1_CTRL,
+		&R8_UEP2_CTRL,
+		&R8_UEP3_CTRL,
+		&R8_UEP4_CTRL,
+		&R8_UEP5_CTRL,
+		&R8_UEP6_CTRL,
+		&R8_UEP7_CTRL,
+	};
+	// ep4's dma buffer is hardcoded pointing to 
+	// the next ep0
+	if (ep_num != 4)
+		*p_regs[ep_num] = (uint16_t)(uint32_t)buf;
+
+	*ctrl_regs[ep_num] = UEP_R_RES_ACK | UEP_T_RES_NAK;
+}
+
+static void init(void)
+{
+	R8_USB_CTRL = 0x00;
+
+	R8_UEP4_1_MOD = RB_UEP4_RX_EN | RB_UEP4_TX_EN |
+				RB_UEP1_RX_EN | RB_UEP1_TX_EN;
+	R8_UEP2_3_MOD = RB_UEP2_RX_EN | RB_UEP2_TX_EN |
+				RB_UEP3_RX_EN | RB_UEP3_TX_EN;
+	R8_UEP567_MOD = RB_UEP7_RX_EN | RB_UEP7_TX_EN |
+				RB_UEP6_RX_EN | RB_UEP6_TX_EN |
+				RB_UEP5_RX_EN | RB_UEP5_TX_EN;
+
+	R16_PIN_ANALOG_IE |= RB_PIN_USB_IE | RB_PIN_USB_DP_PU;
+	R8_UDEV_CTRL = RB_UD_PD_DIS | RB_UD_PORT_EN;
+
+	R8_USB_DEV_AD = 0x00;
+	R8_USB_INT_FG = 0xFF;
+	R8_USB_CTRL = RB_UC_DEV_PU_EN | RB_UC_INT_BUSY | RB_UC_DMA_EN;
+	R8_USB_INT_EN = RB_UIE_SUSPEND | RB_UIE_BUS_RST | RB_UIE_TRANSFER;
+}
+
+void ctrl_init();
+void hiddev_init();
+void cdc_acm_init();
+
+void usb_start() {
+	cfg_desc_append(&cfg_static);
+
+	ctrl_init();
+
+	/* This should be placed first, the python script always looks
+	for the first interface (not the interface number) */
+	hiddev_init();
+
+	cdc_acm_init();
+
+	init();
+	PFIC_EnableIRQ(USB_IRQn);
+}
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