os/arch/arm/src/amebasmart: increase I2S dma page to 8 to increase to…

…lerate of delays 1. there are delays between I2S DMA interrupt caused by other higher priority threads/flash operation, which if exceed the time taken to finish tx all data from dma pages will result in noise 2. with 4K size * 4 page, maximum delays it can tolerate will be ~85.33 ms, delays exceeding this will introduce noise. 3. this commit increases the page from 4 to 8, thus increases the maximum delays it can tolerate to ~170ms.
Samsung · Jan 8, 2025 · 9847c79 · 9847c79
1 parent 374dfef
commit 9847c79
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diff --git a/os/arch/arm/src/amebasmart/amebasmart_i2s.c b/os/arch/arm/src/amebasmart/amebasmart_i2s.c
@@ -120,7 +120,7 @@
 #define OVER_SAMPLE_RATE (384U)
 
 #define I2S_DMA_PAGE_SIZE 4096 	/* 4 ~ 16384, set to a factor of APB size */
-#define I2S_DMA_PAGE_NUM 4	/* Vaild number is 2~4 */
+#define I2S_DMA_PAGE_NUM 8	/* Vaild number is 2~8 */
 
 #ifdef CONFIG_PM
 static volatile bool i2s_lock_state = 0;

diff --git a/os/board/rtl8730e/src/component/mbed/targets/hal/rtl8730e/i2s_api.c b/os/board/rtl8730e/src/component/mbed/targets/hal/rtl8730e/i2s_api.c
@@ -20,7 +20,7 @@
 #include "ameba_audio_clock.h"
 #include "amebasmart_i2s.h"
 
-#define SP_MAX_DMA_PAGE_NUM 8
+#define SP_MAX_DMA_PAGE_NUM 9
 
 /** @addtogroup Ameba_Mbed_API
   * @{