Firmwares/raven_spn/src/raven_spn.cpp

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#include "raven_spn.h"
#include "spn_regs.h"
#include "delay.h"
#include "bsp.h"
#include "plic/plic_driver.h"
#include <cstdio>
#include <cstdint>
#include <array>
using spn =spn_regs<0x90000000>;
#define IOF_ENABLE_TERMINAL (0x30000)
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(){
int * local_mem_base = (int *) 0x80000100;
int hartid = read_csr(mhartid);
int val_a = *local_mem_base;
int val_b = *(local_mem_base+1);
int sum = val_a + val_b;
*(local_mem_base+100) = sum;
if (sum == 0xF)
printf("HW thread ID %d: sum of A+B=0x%x\n", hartid, sum);
else {
printf("HW thread ID %d: sum of A+B is not 0x%x. Test FAILED!!!\n", hartid, sum);
}
}
/*!\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(1, msi_interrupt_handler);
// Enable interrupts in general.
set_csr(mstatus, MSTATUS_MIE);
// Enable the Machine-External bit in MIE
set_csr(mie, MIP_MEIP);
}
/*! \brief main function
*
*/
int main() {
platform_init();
spn::start_reg()=1;
printf("set SPN Mode: 1\n");
delayUS(100);
printf("End of execution");
return 0;
}