/* Set baud rate for UART */
void Chip_UART_SetBaud(LPC_USART_T *pUART, uint32_t baudrate)
{
uint32_t err, uart_fra_multiplier, baudRateGenerator;
uint32_t AsyncSysconSystemClock = Chip_Clock_GetAsyncSysconClockRate();
/* Calculate baudrate generator value */
baudRateGenerator = AsyncSysconSystemClock / (16 * baudrate);
err = AsyncSysconSystemClock - baudRateGenerator * 16 * baudrate;
uart_fra_multiplier = (err * 0xFF) / (baudRateGenerator * 16 * baudrate);
pUART->BRG = baudRateGenerator - 1; /* baud rate */
Chip_Clock_EnableAsyncPeriphClock(ASYNC_SYSCTL_CLOCK_FRG);
Chip_SYSCTL_SetUSARTFRGCtrl(uart_fra_multiplier, 0xFF);
}
/* Initialize stopwatch */
void StopWatch_Init(void)
{
/* Use timer 1. Set prescaler to divide by 8 */
const uint32_t prescaleDivisor = 8;
Chip_TIMER_Init(LPC_TIMER32_1);
Chip_TIMER_PrescaleSet(LPC_TIMER32_1, prescaleDivisor - 1);
Chip_TIMER_Enable(LPC_TIMER32_1);
/* Pre-compute tick rate. */
ticksPerSecond = Chip_Clock_GetAsyncSysconClockRate() / prescaleDivisor;
ticksPerMs = ticksPerSecond / 1000;
ticksPerUs = ticksPerSecond / 1000000;
}
/* Setup UART handle and parameters */
static void setupUART()
{
uint32_t frg_mult;
/* 115.2KBPS, 8N1, ASYNC mode, no errors, clock filled in later */
UART_CONFIG_T cfg = {
0, /* U_PCLK frequency in Hz */
115200, /* Baud Rate in Hz */
1, /* 8N1 */
0, /* Asynchronous Mode */
NO_ERR_EN /* Enable No Errors */
};
/* Perform a sanity check on the storage allocation */
if (LPC_UARTD_API->uart_get_mem_size() > sizeof(uartHandleMEM)) {
/* Example only: this should never happen and probably isn't needed for
most UART code. */
errorUART();
}
/* Setup the UART handle */
uartHandle = LPC_UARTD_API->uart_setup((uint32_t) LPC_USART0, (uint8_t *) &uartHandleMEM);
if (uartHandle == NULL) {
errorUART();
}
/* Need to tell UART ROM API function the current UART peripheral clock
speed */
cfg.sys_clk_in_hz = Chip_Clock_GetAsyncSysconClockRate();
/* Initialize the UART with the configuration parameters */
frg_mult = LPC_UARTD_API->uart_init(uartHandle, &cfg);
if (frg_mult) {
Chip_Clock_EnableAsyncPeriphClock(ASYNC_SYSCTL_CLOCK_FRG);
Chip_SYSCTL_SetUSARTFRGCtrl(frg_mult, 0xFF);
}
}
