diff options
Diffstat (limited to 'hw')
| -rw-r--r-- | hw/bsp/msp_exp430f5529lp/msp_exp430f5529lp.c | 33 |
1 files changed, 32 insertions, 1 deletions
diff --git a/hw/bsp/msp_exp430f5529lp/msp_exp430f5529lp.c b/hw/bsp/msp_exp430f5529lp/msp_exp430f5529lp.c index 5fa69465d..29f88ccf5 100644 --- a/hw/bsp/msp_exp430f5529lp/msp_exp430f5529lp.c +++ b/hw/bsp/msp_exp430f5529lp/msp_exp430f5529lp.c @@ -36,6 +36,8 @@ #define BUTTON_PIN BIT1 #define BUTTON_STATE_ACTIVE 1 +uint32_t cnt = 0; + static void SystemClock_Config(void) { WDTCTL = WDTPW + WDTHOLD; // Disable watchdog. @@ -86,16 +88,45 @@ static void SystemClock_Config(void) TA0CCTL0 |= CCIE; TA0CCR0 = 999; // 1000 ticks. TA0CTL |= TASSEL_2 + ID_3 + MC__UP; // Use SMCLK, divide by 8, start timer. + + // Initialize USB power and PLL. + USBKEYPID = USBKEY; + + // VUSB enabled automatically. + // Wait two milliseconds to stabilize, per manual recommendation. + uint32_t ms_elapsed = board_millis(); + do + { + while((board_millis() - ms_elapsed) < 2); + }while(!(USBPWRCTL & USBBGVBV)); + + // USB uses XT2 (4 MHz) directly. Enable the PLL. + USBPLLDIVB |= USBPLL_SETCLK_4_0; + USBPLLCTL |= (UPFDEN | UPLLEN); + + // Wait until PLL locks. Check every 2ms, per manual. + ms_elapsed = board_millis(); + do + { + USBPLLIR &= ~USBOOLIFG; + while((board_millis() - ms_elapsed) < 2); + }while(USBPLLIR & USBOOLIFG); + + USBKEYPID = 0; } void board_init(void) { - SystemClock_Config(); __bis_SR_register(GIE); // Enable interrupts. + SystemClock_Config(); P1DIR |= LED_PIN; // LED output. P1REN |= BUTTON_PIN; // Internal resistor enable. P1OUT |= BUTTON_PIN; // Pullup. + + USBKEYPID = USBKEY; + USBPHYCTL |= PUSEL; // Convert USB D+/D- pins to USB functionality. + USBKEYPID = 0; } //--------------------------------------------------------------------+ |