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msp_exp430f5529lp: Set up UART functionality.

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This commit is contained in:
William D. Jones 2019-10-05 09:37:48 -04:00
parent e4a88bc826
commit 16ff152129
1 changed files with 40 additions and 0 deletions
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40
hw/bsp/msp_exp430f5529lp/msp_exp430f5529lp.c
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@ -115,15 +115,29 @@ static void SystemClock_Config(void)
USBKEYPID = 0;
}
uint32_t wait = 0;
void board_init(void)
{
__bis_SR_register(GIE); // Enable interrupts.
SystemClock_Config();
// Enable basic I/O.
P1DIR |= LED_PIN; // LED output.
P1REN |= BUTTON_PIN; // Internal resistor enable.
P1OUT |= BUTTON_PIN; // Pullup.
// Enable the backchannel UART (115200)
P4DIR |= BIT5;
P4SEL |= (BIT5 | BIT4);
UCA1CTL1 |= (UCSSEL__SMCLK | UCSWRST); // Hold in reset, use SMCLK.
UCA1BRW = 4;
UCA1MCTL |= (UCBRF_3 | UCBRS_5 | UCOS16); // Overampling mode, 115200 baud.
// Copied from manual.
UCA1CTL1 &= ~UCSWRST;
// Set up USB pins.
USBKEYPID = USBKEY;
USBPHYCTL |= PUSEL; // Convert USB D+/D- pins to USB functionality.
USBKEYPID = 0;
@ -150,6 +164,32 @@ uint32_t board_button_read(void)
return (P1IN & BIT1);
}
int board_uart_read(uint8_t * buf, int len)
{
for(int i = 0; i < len; i++)
{
// Wait until something to receive (cleared by reading buffer).
while(!(UCA1IFG & UCRXIFG));
buf[i] = UCA1RXBUF;
}
return 0;
}
int board_uart_write(void const * buf, int len)
{
const char * char_buf = (const char *) buf;
for(int i = 0; i < len; i++)
{
// Wait until TX buffer is empty (cleared by writing buffer).
while(!(UCA1IFG & UCTXIFG));
UCA1TXBUF = char_buf[i];
}
return 0;
}
#if CFG_TUSB_OS == OPT_OS_NONE
volatile uint32_t system_ticks = 0;
void __attribute__ ((interrupt(TIMER0_A0_VECTOR))) TIMER0_A0_ISR (void)