max80_fw/rv32/esp.c

#include "compiler.h"
#include "common.h"
#include "io.h"
#include "console.h"
#include "esplink.h"

struct dram_io_head __dram_io_head dram_io_head;

uint32_t __dram_io dram_io[(65536 - sizeof(struct dram_io_head)) >> 2];

IRQHANDLER(esp,0)
{
    uint32_t irqstatus = ESP_CPU_IRQ;
    ESP_CPU_IRQ_CLR = irqstatus;

    if (irqstatus & (1 << RV_IRQ_UNDERRUN)) {
	con_printf("[ESP] ESP link memory underrun!!\n");
    }
    if (irqstatus & (1 << RV_IRQ_HELLO)) {
	con_printf("[ESP] Got hello, sending ready...\n");
	/* Hello, are you there? Yes, I'm here... */
	ESP_SPI_IRQ_SET = 1 << ESP_IRQ_READY;
    }
}

void esp_init(void)
{
    static char __dram_data esp_signature[] = "Hej tomtebuggar slå i glasen!";

    dram_io_head.magic         = 0;
    dram_io_head.hlen          = sizeof dram_io_head;
    dram_io_head.dptr          = dram_io;
    dram_io_head.dlen          = sizeof dram_io;
    dram_io_head.board.cfg     = SYS_BOARDCFG;
    dram_io_head.signature     = esp_signature;
    dram_io_head.signature_len = sizeof esp_signature - 1;
    memset(&dram_io_head.resv, 0, sizeof dram_io_head.resv);

    dram_io_head.magic         = DRAM_IO_MAGIC;
    ESP_SPI_IRQ_SET = 1 << ESP_IRQ_READY;

    unmask_irq(ESP_IRQ);
}