Diff: DMA.cpp

Revision:

3:0f10f536456e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DMA.cpp	Sun Nov 21 13:58:53 2010 +0000
@@ -0,0 +1,185 @@
+/*
+    Copyright (c) 2010 Andy Kirkham
+ 
+    Permission is hereby granted, free of charge, to any person obtaining a copy
+    of this software and associated documentation files (the "Software"), to deal
+    in the Software without restriction, including without limitation the rights
+    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+    copies of the Software, and to permit persons to whom the Software is
+    furnished to do so, subject to the following conditions:
+ 
+    The above copyright notice and this permission notice shall be included in
+    all copies or substantial portions of the Software.
+ 
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+    THE SOFTWARE.
+*/
+
+#include "MODSERIAL.h"
+#include "MACROS.h"
+
+#define DMA_CHANNEL_ENABLE  1
+
+#define DMA_CHANNEL_SRC_PERIPHERAL_UART0_TX  (8UL  << 1)
+#define DMA_CHANNEL_SRC_PERIPHERAL_UART0_RX  (9UL  << 1)
+#define DMA_CHANNEL_SRC_PERIPHERAL_UART1_TX  (10UL << 1)
+#define DMA_CHANNEL_SRC_PERIPHERAL_UART1_RX  (11UL << 1)
+#define DMA_CHANNEL_SRC_PERIPHERAL_UART2_TX  (12UL << 1)
+#define DMA_CHANNEL_SRC_PERIPHERAL_UART2_RX  (13UL << 1)
+#define DMA_CHANNEL_SRC_PERIPHERAL_UART3_TX  (14UL << 1)
+#define DMA_CHANNEL_SRC_PERIPHERAL_UART3_RX  (15UL << 1)
+#define DMA_CHANNEL_DST_PERIPHERAL_UART0_TX  (8UL  << 6)
+#define DMA_CHANNEL_DST_PERIPHERAL_UART0_RX  (9UL  << 6)
+#define DMA_CHANNEL_DST_PERIPHERAL_UART1_TX  (10UL << 6)
+#define DMA_CHANNEL_DST_PERIPHERAL_UART1_RX  (11UL << 6)
+#define DMA_CHANNEL_DST_PERIPHERAL_UART2_TX  (12UL << 6)
+#define DMA_CHANNEL_DST_PERIPHERAL_UART2_RX  (13UL << 6)
+#define DMA_CHANNEL_DST_PERIPHERAL_UART3_TX  (14UL << 6)
+#define DMA_CHANNEL_DST_PERIPHERAL_UART3_RX  (15UL << 6)
+
+#define DMA_CHANNEL_SRC_INC                 (1UL << 26)
+#define DMA_CHANNEL_DST_INC                 (1UL << 27)
+#define DMA_CHANNEL_TCIE                    (1UL << 31)
+#define DMA_TRANSFER_TYPE_M2M               (0UL << 11)
+#define DMA_TRANSFER_TYPE_M2P               (1UL << 11)
+#define DMA_TRANSFER_TYPE_P2M               (2UL << 11)
+#define DMA_TRANSFER_TYPE_P2P               (3UL << 11)
+#define DMA_MASK_IE                         (1UL << 14)
+#define DMA_MASK_ITC                        (1UL << 15)
+#define DMA_LOCK                            (1UL << 16)
+#define DMA_ACTIVE                          (1UL << 17)
+#define DMA_HALT                            (1UL << 18)
+
+namespace AjK {
+
+extern "C" void isr_dma_core(void);
+
+class MODSERIAL *modserial_this[4] = { 
+    (class MODSERIAL *)NULL, 
+    (class MODSERIAL *)NULL, 
+    (class MODSERIAL *)NULL, 
+    (class MODSERIAL *)NULL };
+
+uint32_t old_dma_vector = 0;
+typedef void (*MODSERIALFN)(void);
+
+
+
+int 
+MODSERIAL::dmaSend(char *buffer, int length, dmaChannel q)
+{
+    LPC_GPDMACH_TypeDef *dma_base = dmaSetup(q);
+    
+    switch( _uidx ) {
+        case 0: LPC_UART0->DMAREQSEL &= ~(1UL << 0) & 0xFF; break;
+        case 1: LPC_UART0->DMAREQSEL &= ~(1UL << 2) & 0xFF; break;
+        case 2: LPC_UART0->DMAREQSEL &= ~(1UL << 4) & 0xFF; break;
+        case 3: LPC_UART0->DMAREQSEL &= ~(1UL << 6) & 0xFF; break;
+        default: error("No _uidx to request select for DMA UART peripheral destination.");
+    }
+        
+    dma_base->DMACCSrcAddr  = (uint32_t)buffer; 
+    dma_base->DMACCDestAddr = (uint32_t)_base + MODSERIAL_THR;
+    dma_base->DMACCLLI      = 0;
+    dma_base->DMACCControl  = DMA_CHANNEL_TCIE | DMA_CHANNEL_SRC_INC | (uint32_t)length;
+    
+    uint32_t DestPeripheral = DMA_CHANNEL_DST_PERIPHERAL_UART0_TX;
+    switch ( _uidx ) {
+        case 0: DestPeripheral = DMA_CHANNEL_DST_PERIPHERAL_UART0_TX; break;
+        case 1: DestPeripheral = DMA_CHANNEL_DST_PERIPHERAL_UART1_TX; break;
+        case 2: DestPeripheral = DMA_CHANNEL_DST_PERIPHERAL_UART2_TX; break;
+        case 3: DestPeripheral = DMA_CHANNEL_DST_PERIPHERAL_UART3_TX; break;
+        default: error("No _uidx to identify DMA peripheral destination."); // Redundent.
+    }
+    
+    /* Enable SSP0 DMA. */
+    //LPC_SSP0->DMACR = 0x3;
+
+    // Enable Channel
+    dma_base->DMACCConfig = DMA_CHANNEL_ENABLE | 
+                            DestPeripheral | 
+                            DMA_TRANSFER_TYPE_M2P |
+                            DMA_MASK_IE |
+                            DMA_MASK_ITC;
+    
+    /* Wait until at least one byte has arrived into the RX FIFO
+       and then start-up the Channel1 DMA to begin transferring them. */
+    // while((LPC_SSP0->SR & (1UL << 2)) == 0);
+    
+    /* Enable Channel1 */
+    /*
+    LPC_GPDMACH1->DMACCConfig = DMA_CHANNEL_ENABLE | 
+                                DMA_CHANNEL_SRC_PERIPHERAL_SSP0_RX | 
+                                DMA_TRANSFER_TYPE_P2M |
+                                DMA_MASK_IE |
+                                DMA_MASK_ITC;
+    */
+                                
+    /* SSP0 CS line and "page_read_in_progress" flag are now 
+       under DMA/SSP0 interrupt control. See the DMA ISR handlers 
+       and SSP0 ISR handlers for more information. */
+       
+    return 1;   
+}
+
+void 
+MODSERIAL::isr_tx_dma(void)
+{
+
+}
+
+void 
+MODSERIAL::isr_rx_dma(void)
+{
+
+}
+
+LPC_GPDMACH_TypeDef *
+MODSERIAL::dmaSetup(dmaChannel q)
+{
+    if (LPC_SC->PCONP  & (1UL << 29) == 0 ) {
+        LPC_SC->PCONP |= (1UL << 29);
+        LPC_GPDMA->DMACConfig = 1;
+    }
+        
+    if ( old_dma_vector == NULL ) old_dma_vector = NVIC_GetVector(DMA_IRQn);
+    NVIC_SetVector(DMA_IRQn, (uint32_t)isr_dma_core);
+    NVIC_EnableIRQ(DMA_IRQn);
+    
+    modserial_this[_uidx] = this;
+    
+    LPC_GPDMA->DMACIntTCClear = (1UL << (int)dmaInUse);    
+    
+    LPC_GPDMACH_TypeDef *dma_base = dmaSelectChannel( q );
+    return dma_base;
+}
+
+void
+MODSERIAL::this_reset(void)
+{
+    modserial_this[_uidx] = (class MODSERIAL *)NULL;
+}
+
+extern "C" void isr_dma_core(void)
+{
+    for (int i = 0; i < 4; i++) {
+        if (modserial_this[i] != (class MODSERIAL *)NULL) {
+            if (modserial_this[i]->dmaInUse[MODSERIAL::RxIrq] != MODSERIAL::NotInUse) {
+                modserial_this[i]->isr_rx_dma();
+            }
+            if (modserial_this[i]->dmaInUse[MODSERIAL::TxIrq] != MODSERIAL::NotInUse) {
+                modserial_this[i]->isr_tx_dma();
+            }
+        }
+    }
+    if (old_dma_vector) {
+        ((MODSERIALFN)old_dma_vector)();
+    }  
+}
+
+}; // namespace AjK ends