diff options
| author | gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4> | 2007-10-30 10:46:57 +0000 |
|---|---|---|
| committer | gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4> | 2007-10-30 10:46:57 +0000 |
| commit | 35dea10cc76722976bfbf368dd50f7617ca86a45 (patch) | |
| tree | c900ffd7fbee5e95c02c1e20c023873c26f877f7 /ports/ARM7-LPC214x/GCC/lpc214x_ssp.c | |
| parent | 5eeed3ddb57efd621240097b87129c49ed6185a6 (diff) | |
| download | ChibiOS-35dea10cc76722976bfbf368dd50f7617ca86a45.tar.gz ChibiOS-35dea10cc76722976bfbf368dd50f7617ca86a45.tar.bz2 ChibiOS-35dea10cc76722976bfbf368dd50f7617ca86a45.zip | |
git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@69 35acf78f-673a-0410-8e92-d51de3d6d3f4
Diffstat (limited to 'ports/ARM7-LPC214x/GCC/lpc214x_ssp.c')
| -rw-r--r-- | ports/ARM7-LPC214x/GCC/lpc214x_ssp.c | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/ports/ARM7-LPC214x/GCC/lpc214x_ssp.c b/ports/ARM7-LPC214x/GCC/lpc214x_ssp.c new file mode 100644 index 000000000..4168b6157 --- /dev/null +++ b/ports/ARM7-LPC214x/GCC/lpc214x_ssp.c @@ -0,0 +1,78 @@ +/*
+ ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.
+
+ This file is part of ChibiOS/RT.
+
+ ChibiOS/RT is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ ChibiOS/RT is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <ch.h>
+
+#include "lpc214x.h"
+#include "lpc214x_ssp.h"
+
+static BYTE8 *ip, *op;
+static t_size icnt, ocnt;
+static t_sspnotify callback;
+
+void SSPIrq(void) {
+}
+
+/*
+ * Starts an asynchronous SSP transfer.
+ * @param in pointer to the incoming data buffer, if this parameter is set to
+ * \p NULL then the incoming data is discarded.
+ * @param out pointer to the outgoing data buffer, if this parameter is set to
+ * \p NULL then 0xFF bytes will be output.
+ * @param n the number of bytes to be transferred
+ * @param fn callback function invoked when the operation is done
+ * @return \p SSP_OK if the trasfer is started else \p SSP_RUNNING if a
+ * an operation was already started
+ */
+t_msg sspRWI(BYTE8 *in, BYTE8 *out, t_size n, t_sspnotify fn) {
+
+ if (callback)
+ return SSP_RUNNING;
+
+ callback = fn, ip = in, op = out, icnt = ocnt = n;
+ SSPIMSC = IMSC_ROR | IMSC_RT | IMSC_RX | IMSC_TX;
+ return SSP_OK;
+}
+
+/*
+ * SSP setup, must be invoked with interrupts disabled.
+ * Do not invoke while an operation is in progress.
+ */
+void SetSSPI(int cpsr, int cr0, int cr1) {
+ SSP *ssp = SSPBase;
+
+ ssp->SSP_CR1 = cr1 & ~CR1_SSE;
+ ssp->SSP_CR0 = cr0;
+ ssp->SSP_CPSR = cpsr;
+ ssp->SSP_CR1 = cr1 | CR1_SSE;
+}
+
+/*
+ * SSP subsystem initialization.
+ */
+void InitSSP(void) {
+
+ /* Enables the SPI1 clock */
+ PCONP = (PCONP & PCALL) | PCSPI1;
+
+ /* Clock = PCLK / 2 */
+ SetSSPI(2, CR0_DSS8BIT | CR0_FRFSPI | CR0_CLOCKRATE(0), 0);
+
+ VICIntEnable = INTMASK(SOURCE_SPI1);
+}
|