kdebug_at91.c

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00001 
00039 #include "kdebug_at91.h"
00040 #include <cfg/macros.h> /* for BV(), DIV_ROUND */
00041 #include <appconfig.h>
00042 #include <hw_cpu.h>     /* for CLOCK_FREQ */
00043 #include <hw_ser.h>     /* Required for bus macros overrides */
00044 
00045 #include <io/arm.h>
00046 
00047 #if CONFIG_KDEBUG_PORT == KDEBUG_PORT_DBGU
00048     #define KDBG_WAIT_READY()     while (!(DBGU_SR & BV(US_TXRDY))) {}
00049     #define KDBG_WAIT_TXDONE()    while (!(DBGU_SR & BV(US_TXEMPTY))) {}
00050 
00051     #define KDBG_WRITE_CHAR(c)    do { DBGU_THR = (c); } while(0)
00052 
00053     /* Debug unit is used only for debug purposes so does not generate interrupts. */
00054     #define KDBG_MASK_IRQ(old)    do { (void)old; } while(0)
00055 
00056     /* Debug unit is used only for debug purposes so does not generate interrupts. */
00057     #define KDBG_RESTORE_IRQ(old) do { (void)old; } while(0)
00058 
00059     typedef uint32_t kdbg_irqsave_t;
00060 
00061 #else
00062     #error CONFIG_KDEBUG_PORT should be KDEBUG_PORT_DBGU
00063 #endif
00064 
00065 
00066 INLINE void kdbg_hw_init(void)
00067 {
00068     #if CONFIG_KDEBUG_PORT == KDEBUG_PORT_DBGU
00069         /* Disable all DBGU interrupts. */
00070         DBGU_IDR =  0xFFFFFFFF;
00071         /* Reset DBGU */
00072         DBGU_CR =  BV(US_RSTRX) | BV(US_RSTTX) | BV(US_RXDIS) | BV(US_TXDIS);
00073         /* Set baudrate */
00074         DBGU_BRGR = DIV_ROUND(CLOCK_FREQ, 16 * CONFIG_KDEBUG_BAUDRATE);
00075         /* Set DBGU mode to 8 data bits, no parity and 1 stop bit. */
00076         DBGU_MR =  US_CHMODE_NORMAL | US_CHRL_8 | US_PAR_NO | US_NBSTOP_1;
00077         /* Enable DBGU transmitter. */
00078         DBGU_CR = BV(US_TXEN);
00079         /* Disable PIO on DGBU tx pin. */
00080         PIOA_PDR = BV(DTXD);
00081         PIOA_ASR = BV(DTXD);
00082         
00083         #if 0 /* Disable Rx for now */
00084         /* Enable DBGU receiver. */
00085         DBGU_CR = BV(US_RXEN);
00086         /* Disable PIO on DGBU rx pin. */
00087         PIOA_PDR = BV(DRXD);
00088         PIOA_ASR = BV(DRXD);
00089         #endif
00090     #else
00091         #error CONFIG_KDEBUG_PORT should be KDEBUG_PORT_DBGU
00092     #endif /* CONFIG_KDEBUG_PORT == KDEBUG_PORT_DBGU */
00093 }