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Add GPDMA LLI functions to create a loop or one-shot chain of LLIs.

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This commit is contained in:
Jared Boone
2013-12-08 18:18:22 -08:00
parent 5b59f9cb0a
commit 9f2260237b
3 changed files with 18 additions and 0 deletions
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12
firmware/common/gpdma.c
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@ -48,3 +48,15 @@ void gpdma_channel_interrupt_error_clear(const uint_fast8_t channel) {
void gpdma_lli_enable_interrupt(gpdma_lli_t* const lli) {
lli->ccontrol |= GPDMA_CCONTROL_I(1);
}
void gpdma_lli_create_loop(gpdma_lli_t* const lli, const size_t lli_count) {
for(size_t i=0; i<lli_count; i++) {
gpdma_lli_t* const next_lli = &lli[(i + 1) % lli_count];
lli[i].clli = (lli[i].clli & ~GPDMA_CLLI_LLI_MASK) | GPDMA_CLLI_LLI((uint32_t)next_lli >> 2);
}
}
void gpdma_lli_create_oneshot(gpdma_lli_t* const lli, const size_t lli_count) {
gpdma_lli_create_loop(lli, lli_count);
lli[lli_count - 1].clli &= ~GPDMA_CLLI_LLI_MASK;
}

4
firmware/common/gpdma.h
View File

@ -22,6 +22,7 @@
#ifndef __GPDMA_H__
#define __GPDMA_H__
#include <stddef.h>
#include <stdint.h>
#include <libopencm3/lpc43xx/gpdma.h>
@ -36,4 +37,7 @@ void gpdma_channel_interrupt_error_clear(const uint_fast8_t channel);
void gpdma_lli_enable_interrupt(gpdma_lli_t* const lli);
void gpdma_lli_create_loop(gpdma_lli_t* const lli, const size_t lli_count);
void gpdma_lli_create_oneshot(gpdma_lli_t* const lli, const size_t lli_count);
#endif/*__GPDMA_H__*/

2
firmware/common/sgpio_dma.c
View File

@ -39,6 +39,8 @@ void sgpio_dma_configure_lli(
const size_t bytes_per_word = 4;
const size_t transfer_words = (transfer_bytes + bytes_per_word - 1) / bytes_per_word;
gpdma_lli_create_loop(lli, lli_count);
for(size_t i=0; i<lli_count; i++) {
void* const peripheral_address = (void*)&SGPIO_REG_SS(0);
void* const memory_address = buffer + (transfer_words * bytes_per_word * i);