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serial.c
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#include "defines.h"
#include "serial.h"
#define SERIAL_SCI_NUM 2
struct h8_3048f_sci {
volatile uint8 smr;
volatile uint8 brr;
volatile uint8 scr;
volatile uint8 tdr;
volatile uint8 ssr;
volatile uint8 rdr;
};
#define H8_3048F_SCI0 ((volatile struct h8_3048f_sci *) 0xffffb0)
#define H8_3048F_SCI1 ((volatile struct h8_3048f_sci *) 0xffffb8)
#define H8_3048F_SCI_SMR_CKS_PER1 0
#define H8_3048F_SCI_SMR_CKS_PER4 1
#define H8_3048F_SCI_SMR_CKS_PER16 2
#define H8_3048F_SCI_SMR_CKS_PER64 3
#define H8_3048F_SCI_SMR_MP (1 << 2)
#define H8_3048F_SCI_SMR_STOP (1 << 3)
#define H8_3048F_SCI_SMR_OE (1 << 4)
#define H8_3048F_SCI_SMR_PE (1 << 5)
#define H8_3048F_SCI_SMR_CHR (1 << 6)
#define H8_3048F_SCI_SMR_CA (1 << 7)
#define H8_3048F_SCI_SCR_CKE0 (1 << 0)
#define H8_3048F_SCI_SCR_CKE1 (1 << 1)
#define H8_3048F_SCI_SCR_TEIE (1 << 2)
#define H8_3048F_SCI_SCR_MPIE (1 << 3)
#define H8_3048F_SCI_SCR_RE (1 << 4)
#define H8_3048F_SCI_SCR_TE (1 << 5)
#define H8_3048F_SCI_SCR_RIE (1 << 6)
#define H8_3048F_SCI_SCR_TIE (1 << 7)
#define H8_3048F_SCI_SSR_MPBT (1 << 0)
#define H8_3048F_SCI_SSR_MPB (1 << 1)
#define H8_3048F_SCI_SSR_TEND (1 << 2)
#define H8_3048F_SCI_SSR_PER (1 << 3)
#define H8_3048F_SCI_SSR_FER (1 << 4)
#define H8_3048F_SCI_SSR_ORER (1 << 5)
#define H8_3048F_SCI_SSR_RDRF (1 << 6)
#define H8_3048F_SCI_SSR_TDRE (1 << 7)
static struct {
volatile struct h8_3048f_sci *sci;
} regs[SERIAL_SCI_NUM] = {
{ H8_3048F_SCI0 },
{ H8_3048F_SCI1 },
};
int serial_init(int index)
{
volatile struct h8_3048f_sci *sci = regs[index].sci;
sci->scr = 0;
sci->smr = 0;
sci->brr = 51; /* 16MHzで9600bps */
sci->scr = H8_3048F_SCI_SCR_RE | H8_3048F_SCI_SCR_TE; /* 送受信可能 */
sci->ssr = 0;
return 0;
}
int serial_is_send_enable(int index)
{
volatile struct h8_3048f_sci *sci = regs[index].sci;
return (sci->ssr & H8_3048F_SCI_SSR_TDRE);
}
int serial_send_byte(int index, unsigned char b)
{
volatile struct h8_3048f_sci *sci = regs[index].sci;
while (!serial_is_send_enable(index));
sci->tdr = b;
sci->ssr &= ~H8_3048F_SCI_SSR_TDRE;
return 0;
}
int serial_is_recv_enable(int index)
{
volatile struct h8_3048f_sci *sci = regs[index].sci;
return (sci->ssr & H8_3048F_SCI_SSR_RDRF);
}
unsigned char serial_recv_byte(int index)
{
volatile struct h8_3048f_sci *sci = regs[index].sci;
unsigned char c;
/* 受信文字が来るまで待つ */
while (!serial_is_recv_enable(index));
c = sci->rdr;
sci->ssr &= ~H8_3048F_SCI_SSR_RDRF; /* 受信完了 */
return c;
}