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Move LLI_COUNT constant out of SGPIO DMA utility functions.

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This commit is contained in:
Jared Boone
2013-12-08 12:50:20 -08:00
parent 2fab6c40cd
commit 6196fa2810
2 changed files with 29 additions and 15 deletions
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37
firmware/common/sgpio_dma.c
View File

@ -29,15 +29,18 @@
#include <sgpio.h>
#include <gpdma.h>
#define LLI_COUNT 4
static void configure_dma_lli(gpdma_lli_t* const lli, const bool direction_transmit, void* const buffer, const size_t byte_count) {
const size_t transfer_count = LLI_COUNT;
static void configure_dma_lli(
gpdma_lli_t* const lli,
const size_t lli_count,
const bool direction_transmit,
void* const buffer,
const size_t byte_count
) {
const size_t transfer_bytes = 4;
const size_t transfer_size = byte_count / transfer_count / transfer_bytes;
const size_t transfer_size = byte_count / lli_count / transfer_bytes;
const size_t transfer_size_bytes = transfer_size * transfer_bytes;
for(size_t i=0; i<transfer_count; i++) {
for(size_t i=0; i<lli_count; i++) {
void* const peripheral_address = (void*)&SGPIO_REG_SS(0);
void* const memory_address = buffer + (transfer_size_bytes * i);
@ -48,7 +51,7 @@ static void configure_dma_lli(gpdma_lli_t* const lli, const bool direction_trans
lli[i].csrcaddr = direction_transmit ? memory_address : peripheral_address;
lli[i].cdestaddr = direction_transmit ? peripheral_address : memory_address;
lli[i].clli = (gpdma_lli_t*)((uint32_t)&lli[(i + 1) % transfer_count] | lli_fetch_master);
lli[i].clli = (gpdma_lli_t*)((uint32_t)&lli[(i + 1) % lli_count] | lli_fetch_master);
lli[i].ccontrol =
GPDMA_CCONTROL_TRANSFERSIZE(transfer_size) |
GPDMA_CCONTROL_SBSIZE(0) |
@ -95,12 +98,15 @@ static void sgpio_dma_enable(const uint_fast8_t channel, const gpdma_lli_t* cons
gpdma_channel_enable(channel);
}
static gpdma_lli_t lli_rx[LLI_COUNT];
static gpdma_lli_t lli_tx[LLI_COUNT];
#define RX_LLI_COUNT 4
#define TX_LLI_COUNT 4
static gpdma_lli_t lli_rx[RX_LLI_COUNT];
static gpdma_lli_t lli_tx[TX_LLI_COUNT];
void sgpio_dma_init(void* const buffer, const size_t byte_count) {
configure_dma_lli(lli_rx, false, buffer, byte_count);
configure_dma_lli(lli_tx, true, buffer, byte_count);
configure_dma_lli(lli_rx, RX_LLI_COUNT, false, buffer, byte_count);
configure_dma_lli(lli_tx, TX_LLI_COUNT, true, buffer, byte_count);
/* DMA peripheral/source 0, option 2 (SGPIO14) -- BREQ */
CREG_DMAMUX &= ~(CREG_DMAMUX_DMAMUXPER0_MASK);
@ -131,10 +137,13 @@ void sgpio_dma_stop() {
gpdma_channel_disable(dma_channel_sgpio);
}
size_t sgpio_dma_current_transfer_index() {
size_t sgpio_dma_current_transfer_index(
const gpdma_lli_t* const lli,
const size_t lli_count
) {
const gpdma_lli_t* const next_lli = (gpdma_lli_t*)GPDMA_CLLI(dma_channel_sgpio);
for(size_t i=0; i<LLI_COUNT; i++) {
if( (lli_rx[i].clli == next_lli) || (lli_tx[i].clli == next_lli) ) {
for(size_t i=0; i<lli_count; i++) {
if( lli[i].clli == next_lli ) {
return i;
}
}

7
firmware/common/sgpio_dma.h
View File

@ -24,12 +24,17 @@
#include <stddef.h>
#include <libopencm3/lpc43xx/gpdma.h>
void sgpio_dma_init(void* const buffer, const size_t byte_count);
void sgpio_dma_rx_start();
void sgpio_dma_tx_start();
void sgpio_dma_irq_tc_acknowledge();
void sgpio_dma_stop();
size_t sgpio_dma_current_transfer_index();
size_t sgpio_dma_current_transfer_index(
const gpdma_lli_t* const lli,
const size_t lli_count
);
#endif/*__SGPIO_DMA_H__*/