From 28feb18a8f6d3dd2d0d78a40d4213407fb54e5dd Mon Sep 17 00:00:00 2001
From: Perry Hung <iperry@alum.mit.edu>
Date: Tue, 27 Apr 2010 18:30:46 -0400
Subject: Added a spi send block function

---
 libmaple/spi.c              | 28 ++++++++++++++++++++++++++--
 libmaple/spi.h              |  3 ++-
 wirish/comm/HardwareSPI.cpp |  6 +++++-
 wirish/comm/HardwareSPI.h   |  1 +
 4 files changed, 34 insertions(+), 4 deletions(-)

diff --git a/libmaple/spi.c b/libmaple/spi.c
index ddc8346..4f34d1a 100644
--- a/libmaple/spi.c
+++ b/libmaple/spi.c
@@ -112,7 +112,7 @@ void spi_init(uint32 spi_num,
  * @param spi_num which spi to send on
  * @return data shifted back from the slave
  */
-void spi_tx(uint32 spi_num, uint8 data) {
+uint8 spi_tx_byte(uint32 spi_num, uint8 data) {
    SPI *spi;
 
    ASSERT(spi_num == 1 || spi_num == 2);
@@ -121,8 +121,32 @@ void spi_tx(uint32 spi_num, uint8 data) {
 
    spi->DR = data;
 
-   while (!(spi->SR & SR_TXE) || (spi->SR & SR_BSY))
+   while (!(spi->SR & SR_TXE) ||
+           (spi->SR & SR_BSY))
       ;
+
+   return spi->DR;
+}
+
+uint8 spi_tx(uint32 spi_num, uint8 *buf, uint32 len) {
+   SPI *spi;
+   uint32 i;
+
+   ASSERT(spi_num == 1 || spi_num == 2);
+   spi = (spi_num == 1) ? (SPI*)SPI1_BASE : (SPI*)SPI2_BASE;
+
+   if (!len) {
+      return 0;
+   }
+
+   while (i < len) {
+      spi->DR = buf[len];
+      while (!(spi->SR & SR_TXE) ||
+              (spi->SR & SR_BSY))
+         ;
+      i++;
+   }
+   return spi->DR;
 }
 
 static void spi_gpio_cfg(const spi_dev *dev) {
diff --git a/libmaple/spi.h b/libmaple/spi.h
index cde3b42..25c2c6b 100644
--- a/libmaple/spi.h
+++ b/libmaple/spi.h
@@ -96,7 +96,8 @@ void spi_init(uint32 spi_num,
               uint32 prescale,
               uint32 endian,
               uint32 mode);
-void spi_tx(uint32 spi_num, uint8 data);
+uint8 spi_tx_byte(uint32 spi_num, uint8 data);
+uint8 spi_tx(uint32 spi_num, uint8 *buf, uint32 len);
 
 static inline uint8 spi_rx(uint32 spi_num) {
    SPI *spi;
diff --git a/wirish/comm/HardwareSPI.cpp b/wirish/comm/HardwareSPI.cpp
index e083ac1..4379a0d 100644
--- a/wirish/comm/HardwareSPI.cpp
+++ b/wirish/comm/HardwareSPI.cpp
@@ -119,7 +119,11 @@ void HardwareSPI::begin(void) {
  * @param data byte to send
  */
 void HardwareSPI::send(uint8 data) {
-   spi_tx(this->spi_num, data);
+   spi_tx_byte(this->spi_num, data);
+}
+
+void HardwareSPI::send(uint8 *buf, uint32 len) {
+   spi_tx(this->spi_num, buf, len);
 }
 
 
diff --git a/wirish/comm/HardwareSPI.h b/wirish/comm/HardwareSPI.h
index b974334..04d67ba 100644
--- a/wirish/comm/HardwareSPI.h
+++ b/wirish/comm/HardwareSPI.h
@@ -50,6 +50,7 @@ class HardwareSPI {
       void begin(void);
       void begin(SPIFrequency freq, uint32 endianness, uint32 mode);
       void send(uint8 data);
+      void send(uint8 *data, uint32 length);
       uint8 recv(void);
 };
 
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