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Added serial_get_src_clock() function into serial_api.c and fastirc_frequency() function into clk_freqs.h for better portability.

pull/805/head
Martin Olejar 2014-12-19 10:55:37 +01:00
parent bb969921ec
commit 1eb8d7cab4
2 changed files with 38 additions and 11 deletions
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27
libraries/mbed/targets/hal/TARGET_Freescale/TARGET_KLXX/TARGET_KL43Z/serial_api.c
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@ -38,6 +38,29 @@ static uart_irq_handler irq_handler;
int stdio_uart_inited = 0;
serial_t stdio_uart;
static inline uint32_t serial_get_src_clock(serial_t *obj) {
uint32_t mux, srcclk;
switch ((int)obj->uart) {
case UART_0:
mux = (SIM->SOPT2 & SIM_SOPT2_LPUART0SRC_MASK) >> SIM_SOPT2_LPUART0SRC_SHIFT;
break;
case UART_1:
mux = (SIM->SOPT2 & SIM_SOPT2_LPUART1SRC_MASK) >> SIM_SOPT2_LPUART1SRC_SHIFT;
break;
case UART_2: /* TODO: add UART2 support */ break;
}
switch (mux) {
case 1: srcclk = fastirc_frequency(); break;
case 2: srcclk = extosc_frequency(); break;
case 3: srcclk = mcgirc_frequency(); break;
default: srcclk = 0; break;
}
return srcclk;
}
void serial_init(serial_t *obj, PinName tx, PinName rx) {
// determine the UART to use
UARTName uart_tx = (UARTName)pinmap_peripheral(tx, PinMap_UART_TX);
@ -103,8 +126,8 @@ void serial_baud(serial_t *obj, int baudrate) {
int calcBaudrate;
uint32_t i, sbr, sbrTemp, osr, temp, baud, baudDiff;
/* Use Fast IRC Clock 48Mhz (set in serial_init(...)) */
uint32_t PCLK = CPU_INT_FAST_CLK_HZ;
/* get value of serial source clock */
uint32_t PCLK = serial_get_src_clock(obj);
/* loop to find the best osr value possible, one that generates minimum baudDiff
* iterate through the rest of the supported values of osr */

4
libraries/mbed/targets/hal/TARGET_Freescale/TARGET_KLXX/clk_freqs.h
View File

@ -33,6 +33,10 @@ static inline uint32_t extosc_frequency(void) {
return CPU_XTAL_CLK_HZ;
}
static inline uint32_t fastirc_frequency(void) {
return CPU_INT_FAST_CLK_HZ;
}
static inline uint32_t mcgirc_frequency(void) {
uint32_t mcgirc_clock = 0;