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PICO: Correct DMA index usage

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//TODO: index / channel / identifier can be one and the same - need support for zero based
This commit is contained in:
blckmn 2025-06-25 04:00:22 +10:00
parent 6a95d4e13f
commit 62ad213878
2 changed files with 25 additions and 5 deletions
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23
src/platform/PICO/dma_pico.c
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@ -58,13 +58,12 @@ dmaChannelDescriptor_t dmaDescriptors[DMA_LAST_HANDLER] = {
#endif
};
#define DMA_CHANNEL_TO_INDEX(channel) ((channel) + 1)
void dma_irq_handler(bool isIrq1)
{
uint32_t status = isIrq1 ? dma_hw->ints1 : dma_hw->ints0; // Read the status register once
// Iterate through all possible DMA channels that have triggered an interrupt
// channel equates to index in the dmaDescriptors array
for (uint8_t channel = 0; channel < DMA_LAST_HANDLER; channel++) {
if (status & (1u << channel)) {
uint8_t index = DMA_CHANNEL_TO_INDEX(channel);
@ -92,8 +91,21 @@ void dma_irq1_handler(void)
dma_irq_handler(true);
}
dmaIdentifier_e dmaGetFreeIdentifier(void)
{
const int channel = dma_claim_unused_channel(true);
if (channel == DMA_INVALID) {
return DMA_INVALID; // No free channel available
}
return DMA_CHANNEL_TO_IDENTIFIER(channel);
}
void dmaSetHandler(dmaIdentifier_e identifier, dmaCallbackHandlerFuncPtr callback, uint32_t priority, uint32_t userParam)
{
if (identifier < DMA_CH0_HANDLER || identifier > DMA_LAST_HANDLER) {
return; // Invalid identifier
}
UNUSED(priority);
/*
Assign the interrupt handler for the DMA channel based on the core
@ -114,7 +126,8 @@ void dmaSetHandler(dmaIdentifier_e identifier, dmaCallbackHandlerFuncPtr callbac
const uint8_t core = 0;
#endif
const uint32_t channel = dmaDescriptors[identifier].channel;
const int index = DMA_IDENTIFIER_TO_INDEX(identifier);
const uint32_t channel = dmaDescriptors[index].channel;
if (core) {
// Core 1 uses DMA IRQ1
if (!dma_irq1_handler_registered) {
@ -133,8 +146,8 @@ void dmaSetHandler(dmaIdentifier_e identifier, dmaCallbackHandlerFuncPtr callbac
}
}
dmaDescriptors[identifier].irqHandlerCallback = callback;
dmaDescriptors[identifier].userParam = userParam;
dmaDescriptors[index].irqHandlerCallback = callback;
dmaDescriptors[index].userParam = userParam;
}
#endif

7
src/platform/PICO/include/platform/dma.h
View file

@ -24,6 +24,7 @@
#include "platform.h"
typedef enum {
DMA_INVALID = -1,
DMA_NONE = 0,
DMA_CH0_HANDLER = 1,
DMA_CH1_HANDLER,
@ -65,3 +66,9 @@ typedef enum {
.owner.owner = 0, \
.owner.resourceIndex = 0 \
}
#define DMA_IDENTIFIER_TO_CHANNEL(identifier) ((identifier) - 1)
#define DMA_CHANNEL_TO_IDENTIFIER(channel) ((dmaIdentifier_e)((channel) + 1))
#define DMA_CHANNEL_TO_INDEX(channel) (channel)
dmaIdentifier_e dmaGetFreeIdentifier(void);