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lpc176x: read chip id and use as usb serial. (#2184)

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Signed-off-by: Matt Baker <baker.matt.j@gmail.com>
This commit is contained in:
Matt Baker
2019-11-21 08:54:20 -08:00
committed by KevinOConnor
parent b0a158c271
commit bab27651a1
5 changed files with 82 additions and 10 deletions
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4
src/lpc176x/Kconfig
View File

@@ -66,4 +66,8 @@ config SERIAL
bool
default y
config HAVE_CHIPID
bool
default y
endif

46
src/lpc176x/usbserial.c
View File

@@ -13,6 +13,7 @@
#include "byteorder.h" // cpu_to_le32
#include "command.h" // DECL_CONSTANT_STR
#include "generic/usb_cdc.h" // usb_notify_ep0
#include "generic/usbstd.h" // usb_string_descriptor
#include "internal.h" // gpio_peripheral
#include "sched.h" // DECL_INIT
#include "usb_cdc_ep.h" // USB_CDC_EP_BULK_IN
@@ -34,6 +35,12 @@
#define RD_EN (1<<0)
#define WR_EN (1<<1)
// IAP interface
#define IAP_LOCATION 0x1fff1ff1
#define IAP_CMD_READ_UID 58
#define IAP_UID_LEN 16
typedef void (*IAP)(uint32_t *, uint32_t *);
static void
usb_irq_disable(void)
{
@@ -104,6 +111,16 @@ sie_select_and_clear(uint32_t idx)
/****************************************************************
* Interface
****************************************************************/
#define USB_STR_SERIAL_CHIPID u"0123456789ABCDEF0123456789ABCDEF"
#define SIZE_cdc_string_serial_chipid \
(sizeof(cdc_string_serial_chipid) + sizeof(USB_STR_SERIAL_CHIPID) - 2)
static struct usb_string_descriptor cdc_string_serial_chipid = {
.bLength = SIZE_cdc_string_serial_chipid,
.bDescriptorType = USB_DT_STRING,
.data = USB_STR_SERIAL_CHIPID,
};
static int_fast8_t
usb_write_packet(uint32_t ep, const void *data, uint_fast8_t len)
@@ -260,10 +277,36 @@ usb_request_bootloader(void)
NVIC_SystemReset();
}
struct usb_string_descriptor *
usbserial_get_serialid(void)
{
return &cdc_string_serial_chipid;
}
/****************************************************************
* Setup and interrupts
****************************************************************/
static void
usb_set_serial(void)
{
uint32_t iap_cmd_uid[5] = {IAP_CMD_READ_UID, 0, 0, 0, 0};
uint32_t iap_resp[5];
IAP iap_entry = (IAP)IAP_LOCATION;
__disable_irq();
iap_entry(iap_cmd_uid, iap_resp);
__enable_irq();
uint8_t *chipid = (uint8_t *)&iap_resp[1];
uint8_t i, j, c;
for (i = 0; i < IAP_UID_LEN; i++) {
for (j = 0; j < 2; j++) {
c = (chipid[i] >> 4*j) & 0xF;
c = (c < 10) ? '0'+c : 'A'-10+c;
cdc_string_serial_chipid.data[2*i+((j)?0:1)] = c;
}
}
}
void
USB_IRQHandler(void)
@@ -300,6 +343,9 @@ DECL_CONSTANT_STR("RESERVE_PINS_USB", "P0.30,P0.29,P2.9");
void
usbserial_init(void)
{
if (CONFIG_USB_SERIAL_NUMBER_CHIPID)
usb_set_serial();
usb_irq_disable();
// enable power
enable_pclock(PCLK_USB);