i2c: Initial stub import of old f4 code
Currently (despite docs) is an import of code reading the onboard i2c peripheral
This commit is contained in:
Karl Palsson
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3 changed files with 246 additions and 0 deletions
40
tests/i2c-master/Makefile.stm32f4-disco
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40
tests/i2c-master/Makefile.stm32f4-disco
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##
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## This file is part of the libopencm3 project.
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##
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## This library is free software: you can redistribute it and/or modify
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## it under the terms of the GNU Lesser General Public License as published by
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## the Free Software Foundation, either version 3 of the License, or
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## (at your option) any later version.
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##
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## This library is distributed in the hope that it will be useful,
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## but WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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## GNU Lesser General Public License for more details.
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##
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## You should have received a copy of the GNU Lesser General Public License
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## along with this library. If not, see <http://www.gnu.org/licenses/>.
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##
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BOARD = stm32f4-disco
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PROJECT = i2c-master-$(BOARD)
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BUILD_DIR = bin-$(BOARD)
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SHARED_DIR = ../../shared
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CFILES = main-$(BOARD).c
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#CFILES += adc-power.c
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CFILES += trace.c trace_stdio.c
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VPATH += $(SHARED_DIR)
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INCLUDES += $(patsubst %,-I%, . $(SHARED_DIR))
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OPENCM3_DIR=../../libopencm3/
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### This section can go to an arch shared rules eventually...
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DEVICE=stm32f405xg
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#OOCD_INTERFACE = stlink-v2
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#OOCD_TARGET = stm32f4x
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OOCD_FILE = ../../openocd/openocd.stm32f4-disco.cfg
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include ../../rules.mk
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17
tests/i2c-master/README.md
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tests/i2c-master/README.md
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i2c master mode tests.
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While many of the disco boards have some form of i2c device onboard,
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which would, on the face of it, make testing easy, it's a different
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device on each board, and there are boards without it.
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Instead, use a known I2C peripheral on all boards, and require/expect
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a known fixed i2c slave device. (Eventually, this will be a soft
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controllable i2c slave in the auto test setup ;)
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Debug is via SWO wherever possible, PA2 (tx only) on less capable cores
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Pinouts:
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board SCLK SDA
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f4-disco PB8 PB9 i2c1
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189
tests/i2c-master/main-stm32f4-disco.c
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tests/i2c-master/main-stm32f4-disco.c
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/*
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* Feb 2017 Karl Palsson <karlp@tweak.net.au>
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <libopencm3/cm3/nvic.h>
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#include <libopencm3/stm32/gpio.h>
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#include <libopencm3/stm32/i2c.h>
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#include <libopencm3/stm32/rcc.h>
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#include "trace.h"
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#define LED_DISCO_GREEN_PORT GPIOD
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#define LED_DISCO_GREEN_PIN GPIO12
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#define CODEC_ADDRESS 0x4a
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static void codec_gpio_init(void)
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{
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/* reset pin */
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rcc_periph_clock_enable(RCC_GPIOD);
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gpio_mode_setup(GPIOD, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO4);
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/* i2c control lines */
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rcc_periph_clock_enable(RCC_GPIOB);
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gpio_mode_setup(GPIOB, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO6 | GPIO9);
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gpio_set_output_options(GPIOB, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, GPIO6 | GPIO9);
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gpio_set_af(GPIOB, GPIO_AF4, GPIO6 | GPIO9);
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}
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static void codec_i2c_init(void)
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{
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rcc_periph_clock_enable(RCC_I2C1);
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i2c_peripheral_disable(I2C1);
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i2c_reset(I2C1);
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i2c_set_standard_mode(I2C1);
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i2c_enable_ack(I2C1);
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i2c_set_dutycycle(I2C1, I2C_CCR_DUTY_DIV2); /* default, no need to do this really */
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i2c_set_clock_frequency(I2C1, I2C_CR2_FREQ_42MHZ);
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/* 42MHz / (100kHz * 2) */
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i2c_set_ccr(I2C1, 210);
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/* standard mode, freqMhz+1*/
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i2c_set_trise(I2C1, 43);
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i2c_peripheral_enable(I2C1);
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}
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static void codec_init(void)
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{
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int i;
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/* Configure the Codec related IOs */
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codec_gpio_init();
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/* reset the codec */
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gpio_clear(GPIOD, GPIO4);
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for (i = 0; i < 1000000; i++) { /* Wait a bit. */
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__asm__("NOP");
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}
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gpio_set(GPIOD, GPIO4);
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codec_i2c_init();
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}
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static int codec_write_reg(uint8_t reg, uint8_t val)
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{
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uint32_t i2c = I2C1;
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while ((I2C_SR2(i2c) & I2C_SR2_BUSY)) {
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}
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i2c_send_start(i2c);
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/* Wait for master mode selected */
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while (!((I2C_SR1(i2c) & I2C_SR1_SB)
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& (I2C_SR2(i2c) & (I2C_SR2_MSL | I2C_SR2_BUSY))));
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i2c_send_7bit_address(i2c, CODEC_ADDRESS, I2C_WRITE);
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/* Waiting for address is transferred. */
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while (!(I2C_SR1(i2c) & I2C_SR1_ADDR));
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/* Cleaning ADDR condition sequence. */
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uint32_t reg32 = I2C_SR2(i2c);
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(void) reg32; /* unused */
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/* Common above here */
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/* Sending the data. */
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i2c_send_data(i2c, reg);
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while (!(I2C_SR1(i2c) & (I2C_SR1_BTF)));
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i2c_send_data(i2c, val);
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while (!(I2C_SR1(i2c) & (I2C_SR1_BTF | I2C_SR1_TxE)));
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/* Send STOP condition. */
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i2c_send_stop(i2c);
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return 0;
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}
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static uint32_t codec_read_reg(uint8_t reg)
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{
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uint32_t i2c = I2C1;
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while ((I2C_SR2(i2c) & I2C_SR2_BUSY)) {
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}
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i2c_send_start(i2c);
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/* Wait for master mode selected */
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while (!((I2C_SR1(i2c) & I2C_SR1_SB)
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& (I2C_SR2(i2c) & (I2C_SR2_MSL | I2C_SR2_BUSY))));
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i2c_send_7bit_address(i2c, CODEC_ADDRESS, I2C_WRITE);
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/* Waiting for address is transferred. */
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while (!(I2C_SR1(i2c) & I2C_SR1_ADDR));
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/* Cleaning ADDR condition sequence. */
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uint32_t reg32 = I2C_SR2(i2c);
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(void) reg32; /* unused */
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/* Common stuff ABOVE HERE */
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i2c_send_data(i2c, reg);
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while (!(I2C_SR1(i2c) & (I2C_SR1_BTF)));
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i2c_send_start(i2c);
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/* Wait for master mode selected */
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while (!((I2C_SR1(i2c) & I2C_SR1_SB)
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& (I2C_SR2(i2c) & (I2C_SR2_MSL | I2C_SR2_BUSY))));
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i2c_send_7bit_address(i2c, CODEC_ADDRESS, I2C_READ);
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/* Waiting for address is transferred. */
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while (!(I2C_SR1(i2c) & I2C_SR1_ADDR));
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i2c_disable_ack(i2c);
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/* Cleaning ADDR condition sequence. */
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reg32 = I2C_SR2(i2c);
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(void) reg32; /* unused */
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i2c_send_stop(i2c);
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while (!(I2C_SR1(i2c) & I2C_SR1_RxNE));
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uint32_t result = i2c_get_data(i2c);
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i2c_enable_ack(i2c);
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I2C_SR1(i2c) &= ~I2C_SR1_AF;
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return result;
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}
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static void codec_readid(void)
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{
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uint8_t res = codec_read_reg(0x01);
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printf("raw res = %#x Codec is %#x (should be 0x1c), revision %d\n", res, res >> 3, res & 0x7);
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}
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int main(void)
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{
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int i, j;
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rcc_clock_setup_hse_3v3(&rcc_hse_8mhz_3v3[RCC_CLOCK_3V3_168MHZ]);
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/* green led for ticking */
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rcc_periph_clock_enable(RCC_GPIOD);
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gpio_mode_setup(LED_DISCO_GREEN_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE,
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LED_DISCO_GREEN_PIN);
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printf("hi guys!\n");
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codec_init();
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codec_readid();
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codec_write_reg(0x14, 0xff);
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for (i = 0; i < 8; i++) {
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uint8_t pass_vol_a = codec_read_reg(0x14);
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printf("Passthrough vol A was: %#x\n", pass_vol_a);
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codec_write_reg(0x14, pass_vol_a >> 1);
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gpio_toggle(LED_DISCO_GREEN_PORT, LED_DISCO_GREEN_PIN);
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for (j = 0; j < 100000; j++) { /* Wait a bit. */
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__asm__("NOP");
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}
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}
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/* Nothing else to do */;
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while (1) {
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;
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}
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return 0;
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}
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