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Wild design!! Broad strokes around 900MHz

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cnlohr
2024-05-18 19:20:45 -07:00
parent e711b4ccd3
commit 8ba24ea7a5
1 changed files with 19 additions and 18 deletions
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ch32v/ch32v003-timer/loratest.c
+19 -18
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@@ -400,7 +400,7 @@ int main()
TIM1->CHCTLR1 = TIM_OC1M_2 | TIM_OC1M_1; TIM1->CHCTLR1 = TIM_OC1M_2 | TIM_OC1M_1;
// Set the Capture Compare Register value to 50% initially // Set the Capture Compare Register value to 50% initially
TIM1->CH3CVR = 7; TIM1->CH3CVR = 3;
TIM1->CH1CVR = 0; // This triggers DMA. TIM1->CH1CVR = 0; // This triggers DMA.
// Enable TIM1 outputs // Enable TIM1 outputs
@@ -451,32 +451,33 @@ int main()
uint32_t targ = 2000; uint32_t targ = 2000;
int run_f = 0; int run_f = 0;
const uint32_t tablef[] = {
0x0a0a0a0a,
0x0a0a0a0b,
0x0a0b0a0b,
0x0b0b0b0a,
0x0b0b0b0b,
0x0b0b0b0c,
0x0b0c0b0c,
0x0c0c0c0b,
0x0c0c0c0c, };
while(1) while(1)
{ {
//XXX GET CREATIVE HOW TO DITHER //XXX GET CREATIVE HOW TO DITHER
uint32_t cp = (SysTick->CNT>>16)&0x7ff; uint32_t cp = (SysTick->CNT>>16)&0x1fff;
int targ_f = cp+37*4*4; //(frameno & 511)*9 + 1700; int shift = cp; //(frameno & 511)*9 + 1700;
int targ_f = 1024;
uint32_t * tail = 0xfffffffc & (uintptr_t)(((uint8_t*)end) - DMA1_Channel2->CNTR); uint32_t * tail = 0xfffffffc & (uintptr_t)(((uint8_t*)end) - DMA1_Channel2->CNTR);
if( tail == end ) tail--; if( tail == end ) tail--;
while( here != tail ) while( here != tail )
{ {
uint32_t setf = 0x0a0a0a09; *(here++) = tablef[run_f>>10];
if( run_f > targ_f ) run_f &= 1023;
{ run_f += shift;
setf = 0x0a0a0a0a;
run_f += 37*4*4;
run_f -= targ_f;
}
else
{
run_f += 36*4*4;
}
*here = setf;
here++;
if( here == end ) if( here == end )
here = start; here = start;
} }