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904.9 extrmemely interesting

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cnlohr
2024-05-18 20:34:11 -07:00
parent 8ba24ea7a5
commit 00a389078d
1 changed files with 54 additions and 39 deletions
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ch32v/ch32v003-timer/loratest.c
+54 -39
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@@ -241,7 +241,6 @@ complete:
void LoopFunction() __attribute__((section(".srodata"))); void LoopFunction() __attribute__((section(".srodata")));
void LoopFunction() void LoopFunction()
{ {
uint8_t * start = (uint8_t*)DMA1_Channel2->MADDR; uint8_t * start = (uint8_t*)DMA1_Channel2->MADDR;
@@ -320,6 +319,59 @@ skipreset:\n\
} }
*/ */
} }
void LoopFunction2() __attribute__((section(".srodata"))) __attribute__ ((noinline));
__attribute__((section(".sdata"))) const uint32_t tablef[] = {
0x09090909,
0x0909090a,
0x090a090a,
0x0a0a0a09,
0x0a0a0a0a,
0x0a0a0a0b,
0x0a0b0a0b,
0x0b0b0b0a,
0x0b0b0b0b,
0x0b0b0b0c,
0x0b0c0b0c,
0x0c0c0c0b,
0x0c0c0c0c,
0x0c0c0c0d,
0x0c0d0c0d,
0x0d0d0d0c,
0x0d0d0d0d,
};
void LoopFunction2()
{
uint32_t * start = (uint8_t*)DMA1_Channel2->MADDR;
uint32_t * end = (uint8_t*)((uint32_t)DMA1_Channel2->MADDR + SENDBUFF_WORDS);
uint32_t * here = start;
uint32_t targ = 2000;
int run_f = 0;
while(1)
{
//
uint32_t * tail = 0xfffffffc & (uintptr_t)(((uint8_t*)end) - DMA1_Channel2->CNTR);
if( tail == end ) tail--;
while( here != tail )
{
uint32_t cp = ((SysTick->CNT>>12)&0x1fff);
*(here++) = tablef[run_f>>13];
run_f &= 8191;
run_f += cp;
if( here == end )
here = start;
}
}
}
int main() int main()
{ {
@@ -444,44 +496,7 @@ int main()
int frameno = 0; int frameno = 0;
// LoopFunction(); // LoopFunction();
LoopFunction2();
uint32_t * start = (uint8_t*)DMA1_Channel2->MADDR;
uint32_t * end = (uint8_t*)((uint32_t)DMA1_Channel2->MADDR + SENDBUFF_WORDS);
uint32_t * here = start;
uint32_t targ = 2000;
int run_f = 0;
const uint32_t tablef[] = {
0x0a0a0a0a,
0x0a0a0a0b,
0x0a0b0a0b,
0x0b0b0b0a,
0x0b0b0b0b,
0x0b0b0b0c,
0x0b0c0b0c,
0x0c0c0c0b,
0x0c0c0c0c, };
while(1)
{
//XXX GET CREATIVE HOW TO DITHER
uint32_t cp = (SysTick->CNT>>16)&0x1fff;
int shift = cp; //(frameno & 511)*9 + 1700;
int targ_f = 1024;
uint32_t * tail = 0xfffffffc & (uintptr_t)(((uint8_t*)end) - DMA1_Channel2->CNTR);
if( tail == end ) tail--;
while( here != tail )
{
*(here++) = tablef[run_f>>10];
run_f &= 1023;
run_f += shift;
if( here == end )
here = start;
}
}
#if 0 #if 0