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stvvglna.c
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stvvglna.c
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/* -------------------------------------------------------------------------------------------------- */
/* The LongMynd receiver: stvvglna.c */
/* - an implementation of the Serit NIM controlling software for the MiniTiouner Hardware */
/* - the LNA support routines (STVVGLNA). The Serit NIM has 2 LNAs */
/* Copyright 2019 Heather Lomond */
/* -------------------------------------------------------------------------------------------------- */
/*
This file is part of longmynd.
Longmynd is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Longmynd is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with longmynd. If not, see <https://www.gnu.org/licenses/>.
*/
/* -------------------------------------------------------------------------------------------------- */
/* ----------------- INCLUDES ----------------------------------------------------------------------- */
/* -------------------------------------------------------------------------------------------------- */
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include "stvvglna.h"
#include "nim.h"
#include "stvvglna_regs.h"
#include "stvvglna_utils.h"
#include "errors.h"
/* -------------------------------------------------------------------------------------------------- */
/* ----------------- ROUTINES ----------------------------------------------------------------------- */
/* -------------------------------------------------------------------------------------------------- */
/* -------------------------------------------------------------------------------------------------- */
uint8_t stvvglna_read_agc(uint8_t input, uint8_t *gain, uint8_t *vgo) {
/* -------------------------------------------------------------------------------------------------- */
/* once we are running, this routine will read the gain and AGC for the LNA specified */
/* input: NIM_INPUT_TOP | NIM_INPUT_BOTTOM: which LNA is being worked on */
/* return: error code */
/* *gain: the gain read from the specified LNA */
/* *vgo: the vgo read from the specified LNA */
/* -------------------------------------------------------------------------------------------------- */
uint8_t err=ERROR_NONE;
uint8_t lna_addr;
uint16_t timeout=0;
uint8_t status;
/* first we decide which LNA to use */
if (input==NIM_INPUT_TOP) lna_addr=NIM_LNA_0_ADDR;
else lna_addr=NIM_LNA_1_ADDR;
/* in fully auto, we can read the gain sn SWLNAGAIN and VGO[4:0]. First we get the LNA to measure the */
/* variable part of the gain for us. Note, it is ok to write 0 to the other bitfields */
if (err==ERROR_NONE) err=stvvglna_write_reg(lna_addr, STVVGLNA_REG1,
STVVGLNA_REG1_GETAGC_START << STVVGLNA_REG1_GETAGC_SHIFT);
do {
err=stvvglna_read_reg(lna_addr, STVVGLNA_REG1, &status); /* read out the status */
timeout++;
if ((err==ERROR_NONE) && (timeout==STVVGLNA_AGC_TIMEOUT)) {
err=ERROR_LNA_AGC_TIMEOUT;
printf("Error: read AGC timeout\n");
}
}
while ((err==ERROR_NONE) && (((status >> STVVGLNA_REG1_GETAGC_SHIFT) & 1)!=STVVGLNA_REG1_GETAGC_FORCED));
stvvglna_read_reg(lna_addr, STVVGLNA_REG0, &status); /* read out the RFAGC high and low bits */
if (err==ERROR_NONE) err=stvvglna_read_reg(lna_addr, STVVGLNA_REG3, gain); /* read out the gain curves */
*gain=((*gain & STVVGLNA_REG3_SWLNAGAIN_MASK) >> STVVGLNA_REG3_SWLNAGAIN_SHIFT);
if (err==ERROR_NONE) err=stvvglna_read_reg(lna_addr, STVVGLNA_REG1, vgo); /* read out the Vagc value */
*vgo=((*vgo & STVVGLNA_REG1_VGO_MASK) >> STVVGLNA_REG1_VGO_SHIFT);
if (err!=ERROR_NONE) printf("ERROR: Failed LNA aquire AGC %i\n", input);
return err;
}
/* -------------------------------------------------------------------------------------------------- */
uint8_t stvvglna_init(uint8_t input, uint8_t state, bool *lna_ok) {
/* -------------------------------------------------------------------------------------------------- */
/* this is the init routine for the LNA */
/* input: NIM_INPUT_TOP | NIM_INPUT_BOTTOM : specifies which LNA we are processing */
/* lna_ok: if we find a NIM with an LNA then we set this to true otherwise false */
/* return: error code */
/* -------------------------------------------------------------------------------------------------- */
uint8_t err;
uint8_t val;
uint8_t lna_addr;
printf("Flow: LNA init %i\n",input);
/* first we decide which LNA to use */
if (input==NIM_INPUT_TOP) lna_addr=NIM_LNA_0_ADDR;
else lna_addr=NIM_LNA_1_ADDR;
/* now check to see if there is an LNA present */
err=stvvglna_read_reg(lna_addr, STVVGLNA_REG0, &val);
if (err!=ERROR_NONE) {
printf(" Status: found an older NIM with no LNA\n");
*lna_ok=false; /* tell caller that there is no LNA */
err=ERROR_NONE; /* we do not throw an error, just exit init */
} else {
/* otherwise, lna is there so we go on to us it */
printf(" Status: found new NIM with LNAs\n");
*lna_ok=true;
/* now check it has a good ID */
if ((val & STVVGLNA_REG0_IDENT_MASK) != STVVGLNA_REG0_IDENT_DEFAULT) {
printf("ERROR: failed to recognise LNA ID %i %i\n",input,val);
err=ERROR_LNA_ID;
}
if (state==STVVGLNA_ON) {
/* set up the defaults. We are going to use fully automatic mode */
if (err==ERROR_NONE) err=stvvglna_write_reg(lna_addr,STVVGLNA_REG0,
(STVVGLNA_REG0_AGC_TUPD_FAST << STVVGLNA_REG0_AGC_TUPD_SHIFT) |
(STVVGLNA_REG0_AGC_TLOCK_SLOW << STVVGLNA_REG0_AGC_TLOCK_SHIFT) );
if (err==ERROR_NONE) err=stvvglna_write_reg(lna_addr,STVVGLNA_REG1,
(STVVGLNA_REG1_LNAGC_PWD_POWER_ON << STVVGLNA_REG1_LNAGC_PWD_SHIFT) |
(STVVGLNA_REG1_GETOFF_ACQUISITION_MODE << STVVGLNA_REG1_GETOFF_SHIFT) |
(STVVGLNA_REG1_GETAGC_FORCED << STVVGLNA_REG1_GETAGC_SHIFT) );
if (err==ERROR_NONE) err=stvvglna_write_reg(lna_addr,STVVGLNA_REG2,
(STVVGLNA_REG2_PATH_ACTIVE << STVVGLNA_REG2_PATH2OFF_SHIFT) |
(STVVGLNA_REG2_RFAGC_PREF_N20DBM << STVVGLNA_REG2_RFAGC_PREF_SHIFT) |
(STVVGLNA_REG2_PATH_ACTIVE << STVVGLNA_REG2_PATH1OFF_SHIFT) |
(STVVGLNA_REG2_RFAGC_MODE_AUTO_TRACK << STVVGLNA_REG2_RFAGC_MODE_SHIFT) );
/* note that in REG3 the gain curves (SWLNAGAIN) are read only in fully automatic mod, so no need to write to them */
if (err==ERROR_NONE) err=stvvglna_write_reg(lna_addr,STVVGLNA_REG3,
(STVVGLNA_REG3_LCAL_17KHZ << STVVGLNA_REG3_LCAL_SHIFT) |
(STVVGLNA_REG3_RFAGC_UPDATE_FORCED << STVVGLNA_REG3_RFAGC_UPDATE_SHIFT) |
(STVVGLNA_REG3_RFAGC_CALSTART_FORCED << STVVGLNA_REG3_RFAGC_CALSTART_SHIFT) );
} else { /* state==STVVGLAN_OFF so disable it as we are not turning it on */
if (err==ERROR_NONE) err=stvvglna_write_reg(lna_addr,STVVGLNA_REG2,
(STVVGLNA_REG2_PATH_OFF << STVVGLNA_REG2_PATH2OFF_SHIFT) |
(STVVGLNA_REG2_PATH_OFF << STVVGLNA_REG2_PATH1OFF_SHIFT) );
}
}
if (err!=ERROR_NONE) printf("ERROR: LNA init %i\n",input);
return err;
}
/* -------------------------------------------------------------------------------------------------- */
void stvvglna_read_regs(uint8_t addr) {
/* -------------------------------------------------------------------------------------------------- */
/* support routine for debug */
/* addr: the i2c address of the LNA to be dumped */
/* return: error code */
/* -------------------------------------------------------------------------------------------------- */
uint8_t val;
printf("LNA 0x%.2x regs:\n",addr);
for(int i=0; i<4; i++) {
stvvglna_read_reg(addr,i,&val);
printf(" 0x%.2x = 0x%.2x\n",i,val);
}
}