joppe/fpga_modem
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

TImer working with tests

Browse Source 
TODO: think of other way of shifting in data. Bit errors make uploading difficult
This commit is contained in:
Joppe Blondel
2026-02-25 22:01:28 +01:00
parent 3a3c951409
commit 838204653a
7 changed files with 142 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

37
sw/sweep/sweep.c
View File

@@ -1,14 +1,45 @@
#include <stdint.h>
#define GPIO_BASE 0x40000000u
#define GPIO_BASE 0x40000000u
static volatile uint32_t * const R_FREQ = (volatile uint32_t *)(GPIO_BASE+0);
static volatile uint32_t * const LEDS = (volatile uint32_t *)(GPIO_BASE+4);
static volatile uint32_t * const LEDGR = (volatile uint32_t *)(GPIO_BASE+8);
static volatile uint32_t * const R_FREQ = (volatile uint32_t *)GPIO_BASE;
#define TIMER_BASE 0x40010000u
static volatile uint32_t * const TIMER = (volatile uint32_t *)(TIMER_BASE+0);
#define MSTATUS_MIE (1u << 3)
#define MIE_MTIE (1u << 7)
extern void trap_entry();
static inline void irq_init() {
/* mtvec first */
asm volatile ("csrw mtvec, %0" :: "r"(trap_entry));
/* enable machine timer interrupt */
asm volatile ("csrs mie, %0" :: "r"(MIE_MTIE));
/* global enable last */
asm volatile ("csrs mstatus, %0" :: "r"(MSTATUS_MIE));
}
void timer_isr(){
static int set = 0;
*TIMER = 18400;
*LEDGR = ~(*LEDGR);
}
void main(){
irq_init();
*LEDGR = 3;
*TIMER = 18400;
for(;;){
for(int i=1000; i<10000; i++){
*R_FREQ = i;
// for(int j=0; j<100; j++) asm volatile("nop");
for(int j=0; j<100; j++) asm volatile("nop");
}
}
}