kdebug_lpc2.c

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00001 
00038 #include <hw/hw_cpufreq.h>     /* for CPU_FREQ */
00039 #include "hw/hw_ser.h"     /* Required for bus macros overrides */
00040 
00041 #include "cfg/cfg_debug.h"
00042 #include <cfg/macros.h> /* for BV(), DIV_ROUND */
00043 
00044 #include <io/lpc23xx.h>
00045 
00046 #if CONFIG_KDEBUG_PORT == 0
00047     #define KDBG_WAIT_READY()     while (!(U0LSR & BV(5))) {}
00048     #define KDBG_WAIT_TXDONE()    while (!(U0LSR & BV(6))) {}
00049 
00050     #define KDBG_WRITE_CHAR(c)    do { U0THR = (c); } while(0)
00051 
00052     #define KDBG_MASK_IRQ(old)    do { \
00053         (old) = U0IER; \
00054         U0IER &= ~BV(1); \
00055     } while(0)
00056 
00057     #define KDBG_RESTORE_IRQ(old) do { \
00058         KDBG_WAIT_TXDONE(); \
00059         U0IER = (old); \
00060     } while(0)
00061 
00062     typedef uint32_t kdbg_irqsave_t;
00063 
00064 #else
00065     #error CONFIG_KDEBUG_PORT should be 0
00066 #endif
00067 
00068 
00069 INLINE void kdbg_hw_init(void)
00070 {
00071     #if CONFIG_KDEBUG_PORT == 0
00072         /* Enable clock for UART0 */
00073         PCONP = BV(3);
00074         /* Set UART0 clk to CPU_FREQ */
00075         PCLKSEL0 &= ~0xC0;
00076         PCLKSEL0 |= 0x40;
00077         /* Set 8bit, 1 stop bit, no parity, DLAB = 1 (enable divisor modify) */
00078         U0LCR = 0x83;
00079         U0DLL = DIV_ROUND(CPU_FREQ, 16 * CONFIG_KDEBUG_BAUDRATE) & 0xFF;
00080         U0DLM = (DIV_ROUND(CPU_FREQ, 16 * CONFIG_KDEBUG_BAUDRATE) >> 8) & 0xFF;
00081         U0FDR = 0x10;
00082         /* Assign TX pin to UART0*/
00083         PINSEL0 &= ~0x30;
00084         PINSEL0 |= 0x10;
00085         /* Set 8bit, 1 stop bit, no parity, DLAB = 0 (disable divisor modify) */
00086         U0LCR = 0x03;
00087         /* Enable transmitter */
00088         U0TER = BV(7);
00089     #else
00090         #error CONFIG_KDEBUG_PORT should be 0
00091     #endif /* CONFIG_KDEBUG_PORT == 0 */
00092 }