From f7f7d63d8a83ec5a2313e21143ff73c247c389a5 Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Tue, 11 Jun 2013 07:03:35 +0200
Subject: Current (broken) state of SPI/WM8723 code.

---
 firmware/drivers/wm8523.c | 111 +++++++++++++++++-----------------------------
 1 file changed, 40 insertions(+), 71 deletions(-)

(limited to 'firmware/drivers/wm8523.c')

diff --git a/firmware/drivers/wm8523.c b/firmware/drivers/wm8523.c
index 36d293a..08b8d97 100644
--- a/firmware/drivers/wm8523.c
+++ b/firmware/drivers/wm8523.c
@@ -27,100 +27,69 @@
 #include "wm8523.h"
 
 #include <string.h>
-#include <lpc17xx_spi.h>
+#include <cli.h>
+
+#include "spi.h"
 
 #define WM8523_WRITE 0
 #define WM8523_READ 1
 
-static SPI_CFG_Type spi_cfg;
-static LPC_SPI_TypeDef spi;
-
-typedef struct __attribute__ ((packed)) {
-  uint8_t rw:1; ///< See WM8523_WRITE and WM8523_READ
-  uint8_t reg:7; ///< See page 35 in the WM8523 manual.
-  uint16_t data;
+typedef union {
+  struct __attribute__ ((packed)) {
+    uint8_t rw:1; ///< See WM8523_WRITE and WM8523_READ
+    uint8_t reg:7; ///< See page 35 in the WM8523 manual.
+    uint16_t data;
+  } val;
+  uint8_t data[3];
 } WM8523_transfer_t;
 
-void WM8523_Init()
-{
-  // 16 bit data tranfers
-	spi_cfg.Databit = SPI_DATABIT_16;
-
-	// WM8523 samples bits on rising edges. Mode 0 or 3 will work
-	// http://en.wikipedia.org/wiki/Serial_Peripheral_Interface_Bus#Clock_polarity_and_phase
-
-	// Mode 0
-	spi_cfg.CPHA = SPI_CPHA_FIRST; // 0
-	spi_cfg.CPOL = SPI_CPOL_HI; // 0
-	/*
-	// Mode 3
-	spi_cfg.CPHA = SPI_CPHA_SECOND; // 1
-	spi_cfg.CPOL = SPI_CPOL_LO; // 1
-	*/
-
-	// We are the master
-	spi_cfg.Mode = SPI_MASTER_MODE;
-
-	// We run on a little endian mcu.
-	spi_cfg.DataOrder = SPI_DATA_LSB_FIRST;
-
-	// Se WM8523 manual page 14. Min clock pulse width 40ns ~= 25MHz
-	spi_cfg.ClockRate = 1000000000; // 1MHz
-
-	SPI_Init(&spi, &spi_cfg);
+void WM8523_init()
+{  
+  cli_write("sizeof: %d", sizeof(WM8523_transfer_t));
+  spi_init();
 }
 
-static volatile int spi_done = 0;
-void spi_mark_as_done()
+void WM8523_deinit()
 {
-  spi_done = 1;
+  spi_deinit();
 }
 
-static void send(void *data, size_t size)
+void WM8523_write(uint8_t reg, uint16_t data)
 {
-  SPI_DATA_SETUP_Type dst;
-  memset(&dst, 0, sizeof(dst));
-  dst.rx_data = data;
-  dst.length = size;
-  dst.callback = spi_mark_as_done;
-  
-  spi_done = 0;
-  SPI_ReadWrite(&spi, &dst, SPI_TRANSFER_INTERRUPT);
+  WM8523_transfer_t t;
+  t.val.rw = WM8523_WRITE;
+  t.val.reg = reg;
+  t.val.data = data;
 
-  while(!spi_done) {}
+  WM8523_transfer_t r;
+  r.val.data = 0xffff;
+
+  spi_read_write(t.data, r.data, 3);
 }
 
-static void receive(void *data, size_t size)
+uint16_t WM8523_read(uint8_t reg)
 {
-  // http://anhnvnguyen.blogspot.dk/2010/04/lpc17xx-gpio-basic_05.html
-  // TODO: set SSEL0 low
-  // PINSEL3[13:12] = p1.21 (SSEL0)
-  LPC_PINCON->PINSEL3 &= ~((1<<13)|(1<<12)); // set to 00
-
-  SPI_DATA_SETUP_Type dst;
-  memset(&dst, 0, sizeof(dst));
-  dst.tx_data = data;
-  dst.length = size;
-  dst.callback = spi_mark_as_done;
+  WM8523_transfer_t t;
+  t.val.rw = WM8523_READ;
+  t.val.reg = reg;
+  t.val.data = 0xffff;
   
-  spi_done = 0;
-  SPI_ReadWrite(&spi, &dst, SPI_TRANSFER_INTERRUPT);
-  
-  while(!spi_done) {}
+  WM8523_transfer_t r;
 
-  // TODO: set SSEL0 high
+  spi_read_write(t.data, r.data, 3);
+  
+  return r.data[0] | (r.data[1] << 8);//r.val.data;
 }
 
 /**
 Volume update registers R06h and R07h are unavailable in SPI control mode.
 To use volume update in software control mode, I2C mode must be used.
 */
-void WM8523_Configure()
+void WM8523_configure()
 {
-  WM8523_transfer_t transfer;
-  transfer.rw = WM8523_READ;
-  transfer.reg = 0; // R0 read version : 0x8523
-  transfer.data = 0;
-  //send(&transfer, sizeof(transfer));
-  receive(&transfer, sizeof(transfer));
+  spi_configure();
+
+  uint16_t id = WM8523_read(0); // Read chip id from reg0.
+
+  cli_write("=%d=", id); // should be 34595 (0x8523)
 }
-- 
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