Add USB stack for easier printf() based debugging of the firmware
This commit is contained in:
Ondrej Jirman
parent
f7857f94ab
commit
2725248532
518
firmware/main.c
518
firmware/main.c
@ -343,6 +343,503 @@ void i2c_slave_init(void)
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P0_EIE3 |= BIT(5); // enable I2C B interrupt
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}
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// }}}
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// {{{ Debug logging
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static uint8_t __xdata log_buffer[1024];
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// end = start => empty buffer
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// end can never equal start on a filled buffer
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// end points to the last char if end != start
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static uint16_t log_start = 0;
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static uint16_t log_end = 0;
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static void putc(char c)
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{
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log_end = (log_end + 1) % 1024;
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if (log_end == log_start) {
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// overflow, just push the start in front of us
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log_start = (log_start + 1) % 1024;
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}
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log_buffer[log_end] = c;
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}
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static void puts(const char* s)
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{
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while (*s)
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putc(*s++);
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}
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static void put_uint(uint16_t value)
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{
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char buf[6];
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char *p = &buf[6 - 1];
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*p = '\0';
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if (!value)
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*--p = '0';
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while (value) {
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*--p = '0' + value % 10;
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value /= 10;
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}
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puts(p);
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}
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static void put_hex_n(uint8_t nibble)
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{
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char c;
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nibble &= 0xf;
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if (nibble < 10)
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c = '0' + nibble;
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else
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c = 'a' + (nibble - 10);
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putc(c);
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}
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static void put_hex_b(uint8_t hex)
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{
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put_hex_n(hex >> 4);
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put_hex_n(hex);
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}
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static void put_hex_w(uint16_t hex)
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{
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put_hex_b(hex >> 8);
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put_hex_b(hex);
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}
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// }}}
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// {{{ USB
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enum {
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UDC_EP_CONTROL = 0,
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UDC_EP_ISO,
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UDC_EP_BULK,
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UDC_EP_INTERRUPT,
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};
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#define UDC_EP_CONF(conf, intf, alt, type) \
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(conf << 6) | (intf << 4) | (alt << 2) | type
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#define UDC_EP_OUT_CONF(ep1, ep2, ep3, ep4) \
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ep4 | (ep3 << 2) | (ep2 << 4) | (ep1 << 6)
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static const uint8_t udc_config[5] = {
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UDC_EP_CONF(1, 0, 0, UDC_EP_INTERRUPT),
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UDC_EP_CONF(1, 0, 0, UDC_EP_INTERRUPT),
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UDC_EP_CONF(1, 0, 0, UDC_EP_INTERRUPT),
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UDC_EP_CONF(1, 0, 0, UDC_EP_INTERRUPT),
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UDC_EP_OUT_CONF(UDC_EP_INTERRUPT, UDC_EP_INTERRUPT, UDC_EP_INTERRUPT, UDC_EP_INTERRUPT),
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};
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static void usb_disable(void)
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{
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// reset phy/usb
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PAGESW = 1;
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P1_PHYTEST0 &= ~BIT(6); // phy disable
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P1_UDCCTRL &= ~BIT(6); // udc disable
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}
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static void usb_init(void)
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{
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PAGESW = 1;
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P1_UDCCTRL |= BIT(6); // udc enable
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// wait for UDC to complete initialization
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while (!(P1_UDCCTRL & BIT(1)));
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__asm__("nop");
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// setup USB EP depths
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P1_UDCEP1BUFDEPTH = 64 - 1;
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P1_UDCEP2BUFDEPTH = 64 - 1;
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P1_UDCEP3BUFDEPTH = 64 - 1;
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P1_UDCEP4BUFDEPTH = 64 - 1;
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__asm__("nop");
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__asm__("nop");
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// configure UDC
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for (uint8_t i = 0; i < 4; i++) {
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P1_UDCCFDATA = udc_config[i];
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while (!(P1_UDCCFSTA & BIT(7)));
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while (P1_UDCCFSTA & BIT(7));
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}
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P1_UDCCFDATA = udc_config[4];
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while (!(P1_UDCCFSTA & BIT(6)));
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// enable USB
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P1_USBCTRL |= BIT(6);
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P1_UDCINT0EN = 0;
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P1_UDCINT1EN = 0;
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P1_UDCINT2EN = 0;
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P1_UDCEPCTRL = 0xf;
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P1_UDCINT0STA = 0;
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P1_UDCINT1STA = 0;
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P1_UDCINT2STA = 0;
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// enable phy
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P1_PHYTEST0 |= BIT(5) | BIT(6);
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__asm__("nop");
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__asm__("nop");
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PAGESW = 0;
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}
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#define USB_ID(w) (uint16_t)w & 0xff, ((uint16_t)w >> 8)
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#define USB_BCD(a, b) b, a
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static const uint8_t usb_desc_device[] ={
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18, // bLength
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1, // bDescriptorType
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USB_BCD(0x2, 0x0), // bcdUSB
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0xff, // bDeviceClass
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0, // bDeviceSubClass
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0xff, // bDeviceProtocol
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64, // bMaxPacketSize0
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USB_ID(0x04f3), // idVendor
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USB_ID(0xb001), // idProduct
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USB_BCD(0x1, 0x0), // bcdDevice
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1, // iManfacturer
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2, // iProduct
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0, // iSerialNumber
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1, // bNumConfgurations
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};
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#define USB_EP_OUT(addr, attr, maxsize, interval) \
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7, 5, addr, attr, USB_ID(maxsize), interval
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#define USB_EP_IN(addr, attr, maxsize, interval) \
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USB_EP_OUT((addr) | 0x80, attr, maxsize, interval)
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static const uint8_t usb_desc_config[] = {
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9, // bLength
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2, // bDescriptorType
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USB_ID(sizeof(usb_desc_config)),// bTotolLength
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1, // bNumInterfaces
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1, // bConfigurationValue
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0, // iConfiguration string index
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BIT(7) // must be set // bmAttributes
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| BIT(6) // self power
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| BIT(5) // remote wakeup
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,
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100, // bMaxPower
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// Interface 0
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9, // bLength
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4, // bDescriptorType
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0, // bInterfaceNumber
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0, // bAlternateSetting
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4, // bNumEndpoints
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0xff, // bInterfaceClass
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0, // bInterfaceSubClass
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0xff, // bInterfaceProtocol
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0, // iInterface
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USB_EP_OUT(1, 3, 64, 1), // request
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USB_EP_IN(2, 3, 64, 1), // response
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USB_EP_IN(3, 3, 64, 1), // debug logging output
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USB_EP_IN(4, 3, 64, 1), // key status changes
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};
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static const uint8_t usb_string_lang[] = {
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4, 3,
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USB_ID(0x0409),
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};
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static const uint8_t usb_string_manufacturer[] = {
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4 * 2 + 2,
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3,
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'm', 0,
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'e', 0,
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'g', 0,
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'i', 0,
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};
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static const uint8_t usb_string_product[] = {
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5 * 2 + 2,
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3,
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'd', 0,
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'e', 0,
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'b', 0,
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'u', 0,
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'g', 0,
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};
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static const uint8_t * const usb_strings[] = {
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usb_string_lang,
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usb_string_manufacturer,
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usb_string_product,
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};
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static uint16_t usb_ep0_in_remaining;
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static uint8_t const* usb_ep0_in_ptr;
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static uint8_t usb_command_status = 0;
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static uint8_t usb_key_change = 0;
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static uint8_t usb_command[8];
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static uint8_t usb_response[8];
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static void usb_tasks(void)
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{
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uint8_t buf[8];
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PAGESW = 1;
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// handle reset request
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if (P1_UDCINT0STA & BIT(5)) {
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P1_USBCTRL |= BIT(5);
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P1_USBCTRL &= ~BIT(5);
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// clear EP0-3 buffers
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P1_UDCEPBUF0CTRL |= 0x55u;
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P1_UDCEPBUF0CTRL &= ~0x55u;
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// clear EP4
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P1_UDCEPBUF1CTRL |= BIT(0);
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P1_UDCEPBUF1CTRL &= ~BIT(0);
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// clear EP0 / EP1 in buffers
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P1_UDCBUFSTA &= ~(BIT(0) | BIT(1));
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//XXX: what about others?
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//XXX: reset software variables...
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puts("usb reset int\n");
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// ack reset request
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P1_UDCINT0STA &= ~BIT(5);
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}
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// ep0 setup request received
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if (P1_UDCINT0STA & BIT(1)) {
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// buf: bReqType bReq wVal(l/h) wIndex wLength
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for (uint8_t i = 0; i < 8; i++)
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buf[i] = P1_UDCEP0BUFDATA;
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// how much data to send to ep0 in
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usb_ep0_in_remaining = (uint16_t)((buf[7] << 8) | buf[6]);
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uint16_t in0_len = 0;
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puts("ep0 setup: ");
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put_hex_b(buf[0]);
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put_hex_b(buf[1]);
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put_hex_b(buf[2]);
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put_hex_b(buf[3]);
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putc('\n');
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// standard commands
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if (buf[0] == 0x80) {
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// GET_DESCRIPTOR
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if (buf[1] == 0x06) {
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if (buf[3] == 1) {
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// device desc: 80 06 00 01 00 00
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if (buf[2] == 0) {
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usb_ep0_in_ptr = usb_desc_device;
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in0_len = sizeof(usb_desc_device);
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goto ack_ep0_setup;
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}
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} else if (buf[3] == 2) {
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// cfg desc: 80 06 00 02 00 00
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if (buf[2] == 0) {
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usb_ep0_in_ptr = usb_desc_config;
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in0_len = sizeof(usb_desc_config);
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goto ack_ep0_setup;
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}
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} else if (buf[3] == 3) {
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// string desc: 80 06 str_index 03 00 00
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if (buf[2] < sizeof(usb_strings) / sizeof(usb_strings[0])) {
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usb_ep0_in_ptr = usb_strings[buf[2]];
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in0_len = usb_ep0_in_ptr[0];
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goto ack_ep0_setup;
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}
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}
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}
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}
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usb_ep0_in_remaining = 0;
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P1_UDCCTRL |= BIT(4); // stall control endpoint req
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ack_ep0_setup:
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if (in0_len < usb_ep0_in_remaining)
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usb_ep0_in_remaining = in0_len;
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// ack
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P1_UDCINT0STA &= ~BIT(1);
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}
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// USB host initiated EP0 IN transfer
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if (P1_UDCINT1STA & BIT(0)) {
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// check if we're ready to send to ep0
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if (!(P1_UDCEPBUF0CTRL & BIT(1))) {
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puts("ep0 in int ack\n");
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// if ep0 in buffer not empty, clear it first
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if (!(P1_UDCBUFSTA & BIT(0))) {
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// clear ep0 buffer
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P1_UDCEPBUF0CTRL |= BIT(0);
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P1_UDCEPBUF0CTRL &= ~BIT(0);
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}
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for (uint8_t n = 0; n < 64; n++) {
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// push data to EP0 in (max 8 bytes)
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if (usb_ep0_in_remaining > 0) {
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usb_ep0_in_remaining--;
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P1_UDCEP0BUFDATA = *usb_ep0_in_ptr++;
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} else {
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break;
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}
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}
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// confirm sending data
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P1_UDCEPBUF0CTRL |= BIT(1);
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// ack interrupt
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P1_UDCINT1STA &= ~BIT(0);
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}
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}
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// data received on ep0 out
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if (P1_UDCINT1STA & BIT(1)) {
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// we don't handle any control transfers that send us data
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// reset ep0 buf
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P1_UDCEPBUF0CTRL |= BIT(0);
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P1_UDCEPBUF0CTRL &= ~BIT(0);
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// ack interrupt
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P1_UDCINT1STA &= ~BIT(1);
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}
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// does not happen, EP1 IN is not configured on host
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if (P1_UDCINT1STA & BIT(2)) {
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puts("ep1 in int ack\n");
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P1_UDCINT1STA &= ~BIT(2);
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}
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// data received on ep1 out (command endpoint)
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if (P1_UDCINT1STA & BIT(3)) {
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// read data from ep1 fifo
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uint8_t bytes = P1_UDCEP1DATAOUTCNT + 1;
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puts("usb cmd len=");
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put_uint(bytes);
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putc(' ');
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for (uint8_t i = 0; i < 8; i++) {
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usb_command[i] = P1_UDCEP1BUFDATA;
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putc(' ');
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put_hex_b(usb_command[i]);
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}
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usb_command_status = 1;
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putc('\n');
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P1_UDCINT1STA &= ~BIT(3);
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// clear the rest
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P1_UDCEPBUF0CTRL |= BIT(2);
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P1_UDCEPBUF0CTRL &= ~BIT(2);
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//do {
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//P1_USBCTRL |= BIT(6);
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//} while(!(P1_USBCTRL & BIT(6)));
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}
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// process USB commands
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if (usb_command_status == 1) {
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// what command the response is for
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usb_response[0] = usb_command[0];
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// success = 0, error code otherwise
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usb_response[1] = 0x00;
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if (usb_command[0] == 0x01) {
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// bootloader mode
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EA = 0;
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__asm__("mov r6,#0x5a");
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__asm__("mov r7,#0xe7");
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__asm__("ljmp 0x0118");
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} else {
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// command unknown
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usb_response[1] = 1;
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}
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usb_command_status = 2;
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}
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// USB host initiated EP2 IN transfer
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if (P1_UDCINT1STA & BIT(4)) {
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// send out response to last command on ep2 in
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if (usb_command_status == 2 && !(P1_UDCEPBUF0CTRL & BIT(5))) {
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P1_UDCEP2DATAINCNT = 8 - 1; // how much bytes to send
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puts("ep2 in response\n");
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for (uint8_t i = 0; i < 8; i++)
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P1_UDCEP2BUFDATA = usb_response[i];
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P1_UDCEPBUF0CTRL |= BIT(5); // EP2 data ready
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usb_command_status = 0;
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}
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// ack
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P1_UDCINT1STA &= ~BIT(4);
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}
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// USB host initiated EP3 IN transfer
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if (P1_UDCINT1STA & BIT(6)) {
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// push printf debug buffer to ep3 in
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if (!(P1_UDCEPBUF0CTRL & BIT(7)) && log_start != log_end) {
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uint8_t cnt = 0;
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while (cnt < 64 && log_start != log_end) {
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log_start = (log_start + 1) % 1024;
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P1_UDCEP3BUFDATA = log_buffer[log_start]; // push data to fifo
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cnt++;
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}
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P1_UDCEP3DATAINCNT = cnt - 1;
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P1_UDCEPBUF0CTRL |= BIT(7); // EP3 data ready
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}
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// ack
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P1_UDCINT1STA &= ~BIT(6);
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}
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// USB host initiated EP4 IN transfer
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if (P1_UDCINT2STA & BIT(2)) {
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// push key change events to ep4 in
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if (!(P1_UDCEPBUF1CTRL & BIT(1)) && usb_key_change) {
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puts("key change sent\n");
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for (uint8_t i = 0; i < 12; i++)
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P1_UDCEP4BUFDATA = i2c_regs[i + 4];
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P1_UDCEP4DATAINCNT = 12 - 1;
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P1_UDCEPBUF1CTRL |= BIT(1); // EP4 data ready
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usb_key_change = 0;
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}
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// ack
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P1_UDCINT2STA &= ~BIT(2);
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}
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// suspend request
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if (P1_UDCINT0STA & BIT(6)) {
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puts("suspend int ack\n");
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// ack
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P1_UDCINT0STA &= ~BIT(6);
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//XXX: handle suspend properly
|
||||
|
||||
// suspend UDC
|
||||
P1_UDCCTRL &= ~BIT(5);
|
||||
}
|
||||
}
|
||||
|
||||
void main(void)
|
||||
{
|
||||
uint8_t scan_active = 0;
|
||||
@ -398,25 +895,33 @@ void main(void)
|
||||
P1_PHCON2 = 0x00;
|
||||
|
||||
// enable auto-tuning internal RC oscillator based on USB SOF packets
|
||||
//P1_IRCCTRL &= ~BIT(1); // disable manual trim
|
||||
P1_IRCCTRL &= ~BIT(1); // disable manual trim
|
||||
|
||||
i2c_slave_init();
|
||||
|
||||
T1_SET_TIMEOUT(40000);
|
||||
|
||||
usb_disable();
|
||||
|
||||
// enable interrupts
|
||||
ET1 = 1;
|
||||
EA = 1;
|
||||
ext_int_deassert();
|
||||
|
||||
puts("Booted kb 0.1\n");
|
||||
|
||||
#if POLL_INPUT
|
||||
keyscan_active();
|
||||
#else
|
||||
keyscan_idle();
|
||||
#endif
|
||||
uint8_t asserted = 0;
|
||||
//uint16_t ticks = 0;
|
||||
uint8_t usb_initialized = 0;
|
||||
uint16_t ticks = 0;
|
||||
while (1) {
|
||||
if (usb_initialized)
|
||||
usb_tasks();
|
||||
|
||||
if (!run_tasks) {
|
||||
// power down (timers don't work in power-down)
|
||||
//PCON |= BIT(1);
|
||||
@ -428,9 +933,15 @@ void main(void)
|
||||
continue;
|
||||
}
|
||||
|
||||
//ticks++;
|
||||
ticks++;
|
||||
run_tasks = 0;
|
||||
|
||||
// usb init needs to run after 500ms
|
||||
if (ticks > 500 / 20 && !usb_initialized) {
|
||||
usb_init();
|
||||
usb_initialized = 1;
|
||||
}
|
||||
|
||||
#if POLL_INPUT
|
||||
// every 20ms we will scan the keyboard keys state and check for changes
|
||||
uint8_t keys[12];
|
||||
@ -453,6 +964,7 @@ void main(void)
|
||||
ext_int_assert();
|
||||
delay_us(100);
|
||||
ext_int_deassert();
|
||||
usb_key_change = 1;
|
||||
#else
|
||||
//XXX: not figured out yet, not tested, not working
|
||||
if (scan_active) {
|
||||
|
||||
Loading…
Reference in New Issue
Block a user