First implementation of dac api (beta version).

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@4815 38d2e660-2303-0410-9eaa-f027e97ec537

diff --git a/bertos/drv/dac.h b/bertos/drv/dac.h
index e745ec11fc6fa529451e49bfed2ad313af81c15d..eacab9896a46b7035de86569a999f983e9e5c15b 100644 (file)
--- a/bertos/drv/dac.h
+++ b/bertos/drv/dac.h
@@ -50,20 +50,99 @@
 
 #include <cfg/compiler.h>
 #include <cfg/debug.h>
+#include <cfg/macros.h>
 #include <cpu/attr.h>
+#include CPU_HEADER(dac)
 
-int dac_write(int ch, void *buf, size_t len);
+struct DacContext;
 
-INLINE int dac_putHalfWord(int ch, uint16_t sample)
+typedef int (*DacWriteFunc_t) (struct DacContext *ctx, unsigned channel, uint16_t sample);
+typedef void (*SetChannelMaskFunc_t) (struct DacContext *ctx, uint32_t mask);
+typedef void (*SetSamplingRate_t) (struct DacContext *ctx, uint32_t rate);
+typedef void (*DmaConversionBufFunc_t) (struct DacContext *ctx, void *buf, size_t len);
+typedef bool (*DmaConversionIsFinished_t) (struct DacContext *ctx);
+typedef void (*DmaStartStreamingFunc_t) (struct DacContext *ctx, void *buf, size_t len, size_t slicelen);
+typedef void *(*DmaWaitConversionFunc_t) (struct DacContext *ctx);
+typedef void (*DmaStopFunc_t) (struct DacContext *ctx);
+
+typedef struct DacContext
+{
+       DacWriteFunc_t write;
+       SetChannelMaskFunc_t setCh;
+       SetSamplingRate_t setSampleRate;
+       DmaConversionBufFunc_t conversion;
+       DmaConversionIsFinished_t isFinished;
+       DmaStartStreamingFunc_t start;
+       DmaWaitConversionFunc_t wait;
+       DmaStopFunc_t stop;
+       size_t slicelen;
+
+       DB(id_t _type);
+} DacContext;
+
+INLINE int dac_write(DacContext *ctx, unsigned channel, uint16_t sample)
+{
+       ASSERT(ctx->write);
+       return ctx->write(ctx, channel, sample);
+}
+
+INLINE void dac_setChannelMask(struct DacContext *ctx, uint32_t mask)
+{
+       ASSERT(ctx->setCh);
+       ctx->setCh(ctx, mask);
+}
+
+INLINE void dac_setSamplingRate(struct DacContext *ctx, uint32_t rate)
+{
+       ASSERT(ctx->setSampleRate);
+       ctx->setSampleRate(ctx, rate);
+}
+
+/**
+ * Convert \param len samples stored into \param buf.
+ */
+INLINE void dac_dmaConversionBuffer(struct DacContext *ctx, void *buf, size_t len)
 {
-       return dac_write(ch, &sample, sizeof(uint16_t));
+       ASSERT(ctx->conversion);
+       ctx->conversion(ctx, buf, len);
 }
 
-INLINE int dac_putWord(int ch, uint32_t sample)
+/**
+ * Check if a dma transfer is finished.
+ *
+ * Useful for kernel-less applications.
+ */
+INLINE bool dac_dmaIsFinished(struct DacContext *ctx)
+{
+       ASSERT(ctx->isFinished);
+       return ctx->isFinished(ctx);
+}
+
+/**
+ * \param slicelen Must be a divisor of len, ie. len % slicelen == 0.
+ */
+INLINE void dac_dmaStartStreaming(struct DacContext *ctx, void *buf, size_t len, size_t slicelen)
 {
-       return dac_write(ch, &sample, sizeof(uint32_t));
+       ASSERT(ctx->start);
+       ASSERT(len % slicelen == 0);
+       ctx->slicelen = slicelen;
+       ctx->start(ctx, buf, len, slicelen);
 }
 
+INLINE void *dac_dmaWaitConversion(struct DacContext *ctx)
+{
+       ASSERT(ctx->wait);
+       return ctx->wait(ctx);
+}
+
+INLINE void dac_dmaStop(struct DacContext *ctx)
+{
+       ASSERT(ctx->stop);
+       ctx->stop(ctx);
+}
+
+#define dac_bits() DAC_BITS
+
 void dac_init(void);
 
 /** \} */ //defgroup dac