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Code Issues Releases Activity

spi: Connect device specific DMA IRQ handlers

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Mark the device specific DMA IRQ handlers as strongly linked
aliases for the genericly named interrupt vector symbol.

Here's how this works...
 * The address of the symbol DMA1_Channel2_IRQHandler is written
   into the DMA1/Channel2 interrupt vector by the linker script.
 * The startup_*.S file specifies Default_Handler() as a weakly
   linked alias for DMA1_Channel2_IRQHandler.
 * We now override the weakly linked alias with the strongly linked
   PIOS_SPI_sdcard_irq_handler().
 * This results in the address of PIOS_SPI_sdcard_irq_handler() being
   written to the vector table for the DMA1/Channel2 interrupt.
 * The PIOS_SPI_sdcard_irq_handler() function is now called whenever
   the DMA1/Channel2 interrupt fires.

git-svn-id: svn://svn.openpilot.org/OpenPilot/trunk@1003 ebee16cc-31ac-478f-84a7-5cbb03baadba
This commit is contained in:
stac 2010-07-04 02:21:13 +00:00 committed by stac
parent b084fc4be5
commit 3eceef43d3
2 changed files with 9 additions and 3 deletions
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4
flight/AHRS/pios_board.c
View File

@ -31,10 +31,12 @@
/* OP Interface
*
* NOTE: Leave this declared as const static data so that it ends up in the
* NOTE: Leave this declared as const data so that it ends up in the
* .rodata section (ie. Flash) rather than in the .bss section (RAM).
*/
void PIOS_SPI_op_irq_handler(void);
void DMA1_Channel5_IRQHandler() __attribute__ ((alias ("PIOS_SPI_op_irq_handler")));
void DMA1_Channel4_IRQHandler() __attribute__ ((alias ("PIOS_SPI_op_irq_handler")));
static const struct pios_spi_cfg pios_spi_op_cfg = {
.regs = SPI2,
.init = {

8
flight/OpenPilot/System/pios_board.c
View File

@ -30,10 +30,12 @@
/* MicroSD Interface
*
* NOTE: Leave this declared as const static data so that it ends up in the
* NOTE: Leave this declared as const data so that it ends up in the
* .rodata section (ie. Flash) rather than in the .bss section (RAM).
*/
void PIOS_SPI_sdcard_irq_handler(void);
void DMA1_Channel2_IRQHandler() __attribute__ ((alias ("PIOS_SPI_sdcard_irq_handler")));
void DMA1_Channel3_IRQHandler() __attribute__ ((alias ("PIOS_SPI_sdcard_irq_handler")));
const struct pios_spi_cfg pios_spi_sdcard_cfg = {
.regs = SPI1,
.init = {
@ -126,10 +128,12 @@ const struct pios_spi_cfg pios_spi_sdcard_cfg = {
/* AHRS Interface
*
* NOTE: Leave this declared as const static data so that it ends up in the
* NOTE: Leave this declared as const data so that it ends up in the
* .rodata section (ie. Flash) rather than in the .bss section (RAM).
*/
void PIOS_SPI_ahrs_irq_handler(void);
void DMA1_Channel4_IRQHandler() __attribute__ ((alias ("PIOS_SPI_ahrs_irq_handler")));
void DMA1_Channel5_IRQHandler() __attribute__ ((alias ("PIOS_SPI_ahrs_irq_handler")));
const struct pios_spi_cfg pios_spi_ahrs_cfg = {
.regs = SPI2,
.init = {