_ peu605
もっと今更、SC-88ProにS/PDIFを付けよう
もっと今更、SC-88ProにS/PDIFを付けよう
STM32F103C8T6 ARM STM32 (blue pill)
- モデル：STM32F103C8T6
- コア：ARM 32 Cortex-M3 CPU
- 72MHz頻度を作動させる
- 64Kフラッシュメモリ、20K SRAM
- 2.0-3.6Vパワー、I/O
というやつ。
詳細はwikiの説明に
https://developer.mbed.org/users/peu605/code/DIT88proSTM32F1/wiki/説明
しまったなぁ、wikiのタイトル、漢字にしてしまったよ…
STM32F103C8T6, Roland, SC-88pro, S/PDIF, SPIDF, デジタル出力
Diff: dit88prostm32.h
- Revision:
- 0:b3d998305b9d
- Child:
- 2:62c8aa0c38c7
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/dit88prostm32.h Fri Sep 01 13:20:19 2017 +0000
@@ -0,0 +1,87 @@
+#include "stm32f1xx_ll_bus.h"
+#include "stm32f1xx_ll_gpio.h"
+#include "stm32f1xx_ll_dma.h"
+#include "stm32f1xx_ll_spi.h"
+#include "stm32f1xx_ll_cortex.h"
+
+/**
+ * STM32F103C8T6 Blue Pill
+ *
+ * Software Digital audio Transmitter
+ * for Roland SC-88pro (32kHz, 18bit, Right justified, 256fs)
+ *
+ * @author masuda, Masuda Naika
+ */
+
+// channel status consumer
+// byte0
+#define C_PRO 0
+#define C_AUDIO 1
+#define C_COPY 2
+#define C_EMPH0 3
+#define C_EMPH1 4
+#define C_EMPH2 5
+#define C_MODE0 6
+#define C_MODE1 7
+
+// byte3
+#define C_FS0 0
+#define C_FS1 1
+#define C_FS2 2
+#define C_FS3 3
+#define C_CLKACC0 4
+#define C_CLKACC1 5
+
+#define _BV(bit) (1 << (bit))
+
+// SPDIF preambles, last cell zero, stretched double to 16bit
+#define PREAMBLE_Z 0b1111110011000000 //0b11101000
+#define PREAMBLE_X 0b1111110000001100 //0b11100010
+#define PREAMBLE_Y 0b1111110000110000 //0b11100100
+
+// Biphase Mark Code table
+volatile const uint16_t bmcTable[16] = {
+ 0b1111000011110000,
+ 0b1100111100001111,
+ 0b1111001100001111,
+ 0b1100110011110000,
+ 0b1111000011001111,
+ 0b1100111100110000,
+ 0b1111001100110000,
+ 0b1100110011001111,
+ 0b1111000011110011,
+ 0b1100111100001100,
+ 0b1111001100001100,
+ 0b1100110011110011,
+ 0b1111000011001100,
+ 0b1100111100110011,
+ 0b1111001100110011,
+ 0b1100110011001100,
+};
+
+// SPIRx-DMA circular buffer
+typedef struct {
+ uint16_t ltCh[8];
+ uint16_t rtCh[8];
+} SpiRxBuff;
+
+// SPITx-DMA circular buffer
+typedef struct {
+ uint16_t aCh[8];
+ uint16_t bCh[8];
+} SpiTxBuff;
+
+// channel status
+typedef struct {
+ uint8_t ltCh;
+ uint8_t rtCh;
+} ChannelStatus;
+
+// Private function prototypes
+uint8_t calcCRC(uint8_t *chStatusPtr);
+uint32_t oddParity(uint32_t val);
+void setChannelStatus();
+void setupPeripherals();
+void transferFrames();
+void transferFrame();
+void transferSubFrame(uint32_t frameIndex, bool aCh, uint16_t *rxBuffPtr, uint16_t *txBuffPtr);
\ No newline at end of file