2 * Copyright © 2019 Bdale Garbee <bdale@gag.com>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
17 #include "ao_ads124s0x.h"
25 #define PRINTD(l, ...) do { if (DEBUG & (l)) { printf ("\r%5u %s: ", ao_tick_count, __func__); printf(__VA_ARGS__); flush(); } } while(0)
30 struct ao_ads124s0x_sample ao_ads124s0x_current;
32 uint8_t ao_ads124s0x_drdy;
35 ao_ads124s0x_start(void) {
36 ao_spi_get_bit(AO_ADS124S0X_SPI_CS_PORT,
37 AO_ADS124S0X_SPI_CS_PIN,
39 AO_ADS124S0X_SPI_SPEED);
43 ao_ads124s0x_stop(void) {
44 ao_spi_put_bit(AO_ADS124S0X_SPI_CS_PORT,
45 AO_ADS124S0X_SPI_CS_PIN,
46 AO_ADS124S0X_SPI_BUS);
50 ao_ads124s0x_reg_read(uint8_t addr)
54 d[0] = addr | AO_ADS124S0X_RREG;
57 ao_spi_send(d, 2, AO_ADS124S0X_SPI_BUS);
58 ao_spi_recv(d, 1, AO_ADS124S0X_SPI_BUS);
61 PRINTD(DEBUG_LOW, "read %x = %x\n", addr, d[0]);
68 ao_ads124s0x_reg_write(uint8_t addr, uint8_t value)
72 PRINTD(DEBUG_LOW, "write %x %x\n", addr, value);
73 d[0] = addr | AO_ADS124S0X_WREG;
77 ao_spi_send(d, 3, AO_ADS124S0X_SPI_BUS);
84 ao_ads124s0x_isr(void)
86 ao_wakeup(&ao_ads124s0x_drdy);
90 ao_ads124s0x_setup(void)
94 uint8_t devid = ao_ads124s0x_reg_read(AO_ADS124S0X_ID);
95 if (devid != AO_ADS124S0X_ID_ADS124S06)
96 ao_panic(AO_PANIC_SELF_TEST_ADS124S0X);
98 ao_exti_setup(AO_ADS124S0X_DRDY_PORT, AO_ADS124S0X_DRDY_PIN,
99 AO_EXTI_MODE_FALLING|AO_EXTI_PRIORITY_HIGH,
102 /* run converter at 4ksps so we can scan 4 channels at 1ksps using
103 full duplex ala datasheet section 9.5.4.3 */
105 d[0] = AO_ADS124S0X_INPMUX | AO_ADS124S0X_WREG;
106 d[1] = 8; /* write 8 registers starting with INPMUX */
107 d[2] = 0x0c; /* input mux AIN0 relative to AINCOM */
108 d[3] = 0x00; /* default first conversion delay, pga disabled */
109 d[4] = 0x1e; /* gchop disabled, internal clock, continuous
110 conversion, low-latency filter, 4000 SPS */
111 d[5] = 0x00; /* ref monitor disabled, ref buffers bypassed, ref
112 set to REFP0/REFN0, internal reference off */
113 d[6] = 0x00; /* pga otuput rail, low side power switch, excitation
114 current source all off */
115 d[7] = 0xff; /* idac1 and idac2 disconnected */
116 d[8] = 0x00; /* all vbias disconnected */
117 d[9] = 0x10; /* sys monitor off, spi timeout disabled, crc disabled,
118 prepending status byte disabled */
119 ao_ads124s0x_start();
120 ao_spi_send(d, 10, AO_ADS124S0X_SPI_BUS);
123 /* start conversions */
125 d[0] = AO_ADS124S0X_START;
126 ao_ads124s0x_start();
127 ao_spi_send(d, 1, AO_ADS124S0X_SPI_BUS);
134 uint8_t d[3], curchan;
136 ao_ads124s0x_setup();
138 ao_exti_enable(AO_ADS124S0X_DRDY_PORT, AO_ADS124S0X_DRDY_PIN);
141 ao_sleep(&ao_ads124s0x_drdy);
144 nextchan = (nextchan + 1) % AO_ADS124S0X_CHANNELS;
146 d[0] = AO_ADS124S0X_INPMUX | AO_ADS124S0X_WREG;
148 d[2] = nextchan << 4 | 0x0c; ; /* relative to AINCOM */
149 ao_ads124s0x_start();
150 ao_spi_duplex(d, d, 3, AO_ADS124S0X_SPI_BUS);
153 ao_ads124s0x_current.ain[curchan] =
154 d[0] << 16 | d[1] << 8 | d[2];
157 // If nextchan == 0, we have a complete set of inputs
158 // and we need to log them somewhere
163 static struct ao_task ao_ads124s0x_task;
166 ao_ads124s0x_dump(void)
168 ao_add_task(&ao_ads124s0x_task, ao_ads124s0x, "ads124s0x");
170 printf ("ADS124S0X value %d %d %d %d\n",
171 ao_ads124s0x_current.ain[0],
172 ao_ads124s0x_current.ain[1],
173 ao_ads124s0x_current.ain[2],
174 ao_ads124s0x_current.ain[3]);
177 const struct ao_cmds ao_ads124s0x_cmds[] = {
178 { ao_ads124s0x_dump, "I\0Display ADS124S0X data" },
183 ao_ads124s0x_init(void)
185 ao_cmd_register(ao_ads124s0x_cmds);
187 ao_spi_init_cs(AO_ADS124S0X_SPI_CS_PORT,
188 (1 << AO_ADS124S0X_SPI_CS_PIN));
190 // ao_add_task(&ao_ads124s0x_task, ao_ads124s0x, "ads124s0x");