kopia lustrzana https://github.com/ArjanteMarvelde/uSDR-pico
81 wiersze
1.5 KiB
C
81 wiersze
1.5 KiB
C
/*
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* relay.c
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*
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* Created: Nov 2021
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* Author: Arjan te Marvelde
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*
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* Two PCF8574 expanders are on the I2C bus, one on the RX and one on the BPF board.
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* The RX (0x42) bit assignments:
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* 0: Enable -20dB attenuator
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* 1: Enable -10dB attenuator
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* 2: Enable +10dB pre-amplifier
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* The BPF (0x40) bit assignments:
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* 0: Enable LPF 2.5 MHz
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* 1: Enable BPF 2.0 - 6.0 MHz
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* 2: Enable BPF 5.0 -12.0 MHz
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* 3: Enable BPF 10.0 -24.0 MHz
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* 4: Enable BPF 20.0 -40.0 MHz
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*
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*/
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#include <stdio.h>
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#include <string.h>
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#include "pico/stdlib.h"
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#include "hardware/i2c.h"
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#include "relay.h"
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/* I2C address and pins */
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#define I2C_RX 0x21
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#define I2C_BPF 0x20
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void relay_setband(int val)
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{
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uint8_t data[2];
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int ret;
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data[0] = ((uint8_t)val)&0x1f;
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if (i2c_write_blocking(i2c1, I2C_BPF, data, 1, false) < 0)
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i2c_write_blocking(i2c1, I2C_BPF, data, 1, false);
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sleep_ms(1);
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}
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int relay_getband(void)
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{
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uint8_t data[2];
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int ret;
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ret = i2c_read_blocking(i2c1, I2C_BPF, data, 1, false);
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if (ret>=0)
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ret=data[0];
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return(ret);
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}
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void relay_setattn(int val)
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{
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uint8_t data[2];
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data[0] = ((uint8_t)val)&0x07;
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if (i2c_write_blocking(i2c1, I2C_RX, data, 1, false) < 0)
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i2c_write_blocking(i2c1, I2C_RX, data, 1, false);
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sleep_ms(1);
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}
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int relay_getattn(void)
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{
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uint8_t data[2];
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int ret;
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ret = i2c_read_blocking(i2c1, I2C_RX, data, 1, false);
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if (ret>=0)
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ret=data[0];
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return(ret);
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}
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void relay_init(void)
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{
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relay_setattn(REL_PRE_10);
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sleep_ms(1);
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relay_setband(REL_BPF12);
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} |