Added a spi send block function

maniacbug · Apr 27, 2010 · 28feb18 · 28feb18
1 parent 434e223
commit 28feb18
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Showing 4 changed files with 34 additions and 4 deletions.
diff --git 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
@@ -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
@@ -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
@@ -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);
 };