I am trying to use periodic interrupts with RTI.
TMS570 receives the clock edge via EXTCLKIN1 every 10ms.
I want the timebase interrupts to be occurred synchronously with the clock edge.
The initialization code is as follows.
RTICAPCTRL = 0U | 0U; /* COMPSEL2 = RTIFRC1 */ rtiREG1->COMPCTRL = (1 << 8); /* initialize counter */ RTIUC0 = 0x00000000U; RTIFRC0 = 0x00000000U; RTITBCTRL = 0x00000000U; /* NTU source (NTU3:EXTCLIKIN1) */ RTIGCTRL = (u32_t)0xFU << 16U; /* setup TB compare register */ RTICPUC0 = NTU_CLK_CNT; /* 10ms */ RTITBLCOMP = NTU_CLK_CNT - WINDOW_WIDTH / 2; RTITBHCOMP = WINDOW_WIDTH / 2; RTITBCTRL = 0x00000003U;
It did not work. No interrupt was occurred.
I try to change RTITBLCOMP and RTITBHCOMP as follows.
RTITBLCOMP = NTU_CLK_CNT / 2; /* 5ms */ RTITBHCOMP = NTU_CLK_CNT / 2;
Then timebase interrupt is delayed by 5ms with respect to the clock edge.
In another case:
RTITBLCOMP = 1; RTITBHCOMP = 1;
It seems work correctly.
(I haven't tested the case of missing clock.)
It does not work with the settings according to the datasheet(spnu499c.pdf).
Is this the right behavior?
