fpga_spn: use separate reset for DMA
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89ea594399
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@ -13,6 +13,7 @@ typedef void (*function_ptr_t) (void);
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plic_instance_t g_plic;
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std::array<function_ptr_t,PLIC_NUM_INTERRUPTS> g_ext_interrupt_handlers;
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bool hw_interrupt{true};
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bool dma_interrupt{true};
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/*! \brief external interrupt handler
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@ -43,11 +44,7 @@ void configure_irq(size_t irq_num, function_ptr_t handler, unsigned char prio=1)
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PLIC_enable_interrupt(&g_plic, irq_num);
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}
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static void msi_interrupt_handler(){
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hw_interrupt = false;
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}
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void wait_for_interrupt() {
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void wait_for_spn_interrupt() {
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// wait until HW is done
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if(hw_interrupt) {
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do{
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@ -58,6 +55,17 @@ void wait_for_interrupt() {
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hw_interrupt=true;
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}
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void wait_for_dma_interrupt() {
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// wait until HW is done
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if(dma_interrupt) {
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do{
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asm("wfi");
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asm("nop");
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}while(dma_interrupt);
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}
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dma_interrupt=true;
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}
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/*!\brief initializes platform
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*
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*/
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@ -77,7 +85,6 @@ void platform_init(){
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clear_csr(mie, MIP_MEIP);
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clear_csr(mie, MIP_MTIP);
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for (auto& h:g_ext_interrupt_handlers) h=no_interrupt_handler;
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configure_irq(2, msi_interrupt_handler);
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// Enable interrupts in general.
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set_csr(mstatus, MSTATUS_MIE);
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// Enable the Machine-External bit in MIE
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@ -25,10 +25,20 @@ void fpga_dma(int direction, int fpga_address, int sc_address, int num_bytes) {
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dma::sc_address_reg() = sc_address;
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dma::bytes_reg() = num_bytes;
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dma::start_reg() = 1;
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wait_for_interrupt();
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wait_for_dma_interrupt();
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dma::clear_interrupt_reg() = 1;
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}
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static void spn_interrupt_handler(){
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printf("spn_interrupt_handler\n");
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hw_interrupt = false;
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}
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static void dma_interrupt_handler(){
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printf("dma_interrupt_handler\n");
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dma_interrupt = false;
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}
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/*! \brief main function
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*
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*/
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@ -36,10 +46,12 @@ int main() {
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platform_init();
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configure_irq(2, spn_interrupt_handler);
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configure_irq(22, dma_interrupt_handler);
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spn::mode_reg() = 1;
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spn::start_reg() = 1;
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wait_for_interrupt();
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wait_for_spn_interrupt();
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spn::interrupt_reg() = 1;
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uint32_t readout = spn::readout_reg();
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printf("READOUT HW:0x%x\n", readout);
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@ -60,8 +72,8 @@ int main() {
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printf("Result Bytes: %d\n", result_bytes);
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uint32_t step = 10000;
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uint32_t iterations = 5;
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uint32_t step = 50000;
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uint32_t iterations = 2;
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uint32_t in_beats = (step * sample_bytes) / axi_bytes;
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@ -84,7 +96,7 @@ int main() {
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for (int k = 0; k < iterations*step; k+=step) {
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fpga_dma(1, fpga_address_in, in_addr, step * sample_bytes);
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run_xspn(fpga_address_in, fpga_address_out, step, in_beats, out_beats);
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wait_for_interrupt();
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wait_for_spn_interrupt();
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spn::interrupt_reg() = 1;
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printf("XSPN finished\n");
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fpga_dma(0, fpga_address_out, out_addr, step * result_bytes);
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