wait for interrupt instead of time delay

This commit is contained in:
Stanislaw Kaushanski 2020-12-14 08:43:11 +01:00
parent db22ccbce5
commit 0d0d12edff
3 changed files with 93 additions and 78 deletions

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85
raven_spn/src/init.h Normal file
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@ -0,0 +1,85 @@
#ifndef SRC_INIT_H_
#define SRC_INIT_H_
#include <cstdio>
#include <array>
#include "delay.h"
#include "bsp.h"
#include "plic/plic_driver.h"
typedef void (*function_ptr_t) (void);
//! Instance data for the PLIC.
plic_instance_t g_plic;
std::array<function_ptr_t,PLIC_NUM_INTERRUPTS> g_ext_interrupt_handlers;
bool hw_interrupt{false};
/*! \brief external interrupt handler
*
* routes the peripheral interrupts to the the respective handler
*
*/
extern "C" void handle_m_ext_interrupt() {
plic_source int_num = PLIC_claim_interrupt(&g_plic);
if ((int_num >=1 ) && (int_num < PLIC_NUM_INTERRUPTS))
g_ext_interrupt_handlers[int_num]();
else
exit(1 + (uintptr_t) int_num);
PLIC_complete_interrupt(&g_plic, int_num);
}
/*! \brief dummy interrupt handler
*
*/
void no_interrupt_handler (void) {};
/*! \brief configure the per-interrupt handler
*
*/
void configure_irq(size_t irq_num, function_ptr_t handler, unsigned char prio=1) {
g_ext_interrupt_handlers[irq_num] = handler;
// Priority must be set > 0 to trigger the interrupt.
PLIC_set_priority(&g_plic, irq_num, prio);
// Have to enable the interrupt both at the GPIO level, and at the PLIC level.
PLIC_enable_interrupt(&g_plic, irq_num);
}
static void msi_interrupt_handler(){
hw_interrupt = true;
}
void wait_for_interrupt() {
while (!hw_interrupt) {
delayUS(1);
};
hw_interrupt = false;
}
/*!\brief initializes platform
*
*/
void platform_init(){
// UART init section TODO: clarify how to get the functions from init.c?
GPIO_REG(GPIO_IOF_SEL) &= ~IOF0_UART0_MASK;
GPIO_REG(GPIO_IOF_EN) |= IOF0_UART0_MASK;
UART0_REG(UART_REG_TXCTRL) |= UART_TXEN;
F_CPU=PRCI_measure_mcycle_freq(20, RTC_FREQ);
printf("core freq at %d Hz\n", F_CPU);
// initialie interupt & trap handling
write_csr(mtvec, &trap_entry);
PLIC_init(&g_plic, PLIC_CTRL_ADDR, PLIC_NUM_INTERRUPTS, PLIC_NUM_PRIORITIES, 0);
// Disable the machine & timer interrupts until setup is done.
clear_csr(mie, MIP_MEIP);
clear_csr(mie, MIP_MTIP);
for (auto& h:g_ext_interrupt_handlers) h=no_interrupt_handler;
configure_irq(2, msi_interrupt_handler);
// Enable interrupts in general.
set_csr(mstatus, MSTATUS_MIE);
// Enable the Machine-External bit in MIE
set_csr(mie, MIP_MEIP);
hw_interrupt = false;
}
#endif /* SRC_INIT_H_ */

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@ -1,88 +1,16 @@
#include "raven_spn.h"
#include "spn_regs.h"
#include "delay.h"
#include "bsp.h"
#include "plic/plic_driver.h"
#include "init.h"
#include <cstdio>
#include <cstdint>
#include <array>
#include <cmath>
#include <cmath> // log
using spn =spn_regs<0x90000000>;
#define IOF_ENABLE_TERMINAL (0x30000)
// huge arrays of XSPN input and referance data
extern std::array<uint8_t, 50000> input_data;
extern std::array<double, 10000> ref_data;
constexpr auto ln2 = std::log(2);
typedef void (*function_ptr_t) (void);
//! Instance data for the PLIC.
plic_instance_t g_plic;
std::array<function_ptr_t,PLIC_NUM_INTERRUPTS> g_ext_interrupt_handlers;
/*! \brief external interrupt handler
*
* routes the peripheral interrupts to the the respective handler
*
*/
extern "C" void handle_m_ext_interrupt() {
plic_source int_num = PLIC_claim_interrupt(&g_plic);
if ((int_num >=1 ) && (int_num < PLIC_NUM_INTERRUPTS))
g_ext_interrupt_handlers[int_num]();
else
exit(1 + (uintptr_t) int_num);
PLIC_complete_interrupt(&g_plic, int_num);
}
/*! \brief dummy interrupt handler
*
*/
void no_interrupt_handler (void) {};
/*! \brief configure the per-interrupt handler
*
*/
void configure_irq(size_t irq_num, function_ptr_t handler, unsigned char prio=1) {
g_ext_interrupt_handlers[irq_num] = handler;
// Priority must be set > 0 to trigger the interrupt.
PLIC_set_priority(&g_plic, irq_num, prio);
// Have to enable the interrupt both at the GPIO level, and at the PLIC level.
PLIC_enable_interrupt(&g_plic, irq_num);
}
static void msi_interrupt_handler(){
printf("INterrupt handler call\n");
}
/*!\brief initializes platform
*
*/
void platform_init(){
// UART init section TODO: clarify how to get the functions from init.c?
GPIO_REG(GPIO_IOF_SEL) &= ~IOF0_UART0_MASK;
GPIO_REG(GPIO_IOF_EN) |= IOF0_UART0_MASK;
UART0_REG(UART_REG_TXCTRL) |= UART_TXEN;
F_CPU=PRCI_measure_mcycle_freq(20, RTC_FREQ);
printf("core freq at %d Hz\n", F_CPU);
// initialie interupt & trap handling
write_csr(mtvec, &trap_entry);
PLIC_init(&g_plic, PLIC_CTRL_ADDR, PLIC_NUM_INTERRUPTS, PLIC_NUM_PRIORITIES, 0);
// Disable the machine & timer interrupts until setup is done.
clear_csr(mie, MIP_MEIP);
clear_csr(mie, MIP_MTIP);
for (auto& h:g_ext_interrupt_handlers) h=no_interrupt_handler;
configure_irq(2, msi_interrupt_handler);
// Enable interrupts in general.
set_csr(mstatus, MSTATUS_MIE);
// Enable the Machine-External bit in MIE
set_csr(mie, MIP_MEIP);
}
bool double_equals(double a, double b, double epsilon = 0.001)
{
return std::abs(a - b) < epsilon;
@ -92,11 +20,12 @@ void run_xspn() {
spn::mode_reg() = 0;
spn::input_length_reg() = 100; // each sample consists of 5 uint8 values
spn::input_addr_reg() = 0x800C0000;
spn::output_addr_reg() = 0x8001C000;
spn::output_addr_reg() = 0x800A0000;
spn::num_of_in_beats_reg() = 8; // Number of AXI4 burst beats needed to load all input data
spn::num_of_out_beats_reg() = 13; // Number of AXI4 burst beats needed to store all result data
spn::start_reg() = 1;
delayUS(50);
wait_for_interrupt();
spn::interrupt_reg() = 1;
}
@ -107,8 +36,9 @@ int main() {
platform_init();
spn::mode_reg() = 1;
spn::start_reg() = 1;
printf("READOUT HW:0x%x\n", spn::readout_reg());
wait_for_interrupt();
spn::interrupt_reg() = 1;
printf("READOUT HW:0x%x\n", spn::readout_reg());
for (int k = 0; k < 10000; k+=100) {
// write input samples into the memory
@ -126,7 +56,7 @@ int main() {
run_xspn();
// read calculation results from the memory
double * res_base = (double*) 0x8001C000;
double * res_base = (double*) 0x800A0000;
for (int i = 0; i < 100; i++) {
if (!double_equals(res_base[i] * ln2, ref_data.at(k+i))) {