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author | Karl Palsson <karlp@tweak.net.au> | 2017-02-21 23:32:50 +0000 |
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committer | Karl Palsson <karlp@tweak.net.au> | 2017-02-21 23:32:50 +0000 |
commit | d30f38ed3c2bf38ef57dd14fac672722b480927c (patch) | |
tree | 8851104939391a92e7420ad223f8a103a4f7ac7f /tests/i2c-master | |
parent | 65301e5a0b382585887ea7b13e4eb9b0cb26c60f (diff) | |
download | olsndot-d30f38ed3c2bf38ef57dd14fac672722b480927c.tar.gz olsndot-d30f38ed3c2bf38ef57dd14fac672722b480927c.tar.bz2 olsndot-d30f38ed3c2bf38ef57dd14fac672722b480927c.zip |
i2c-master: start extracting out i2c code
Working on f4 with an external sht21 i2c sensor.
Still lots of f4 specifics yet. But, progress.
Diffstat (limited to 'tests/i2c-master')
-rw-r--r-- | tests/i2c-master/i2c-master.c | 185 | ||||
-rw-r--r-- | tests/i2c-master/i2c-master.h | 1 | ||||
-rw-r--r-- | tests/i2c-master/main-stm32f4-disco.c | 138 |
3 files changed, 201 insertions, 123 deletions
diff --git a/tests/i2c-master/i2c-master.c b/tests/i2c-master/i2c-master.c index 64c9cfe..2c8e604 100644 --- a/tests/i2c-master/i2c-master.c +++ b/tests/i2c-master/i2c-master.c @@ -2,22 +2,203 @@ * Feb 2017, Karl Palsson <karlp@tweak.net.au> */ +#include <stddef.h> +#include <stdint.h> +#include <stdio.h> #include <libopencm3/stm32/i2c.h> #include <libopencm3/stm32/rcc.h> +#include "trace.h" #include "hw.h" #include "i2c-master.h" +#define SENSOR_ADDRESS (0x40) -void i2cm_init(void) { +enum sht21_cmd_e { + SHT21_CMD_TEMP_HOLD = 0xe3, + SHT21_CMD_HUMIDITY_HOLD = 0xe5, + SHT21_CMD_TEMP_NOHOLD = 0xf3, + SHT21_CMD_HUMIDITY_NOHOLD = 0xf5, + SHT21_CMD_WRITE_REG = 0xe6, + SHT21_CMD_READ_REG = 0xe7, + SHT21_CMD_RESET = 0xfe, + /* 0xfa, 0x0f to read serial */ +}; + +void i2cm_init(void) +{ rcc_periph_clock_enable(hw_details.periph_rcc); rcc_periph_reset_pulse(hw_details.periph_rst); i2c_set_standard_mode(hw_details.periph); - i2c_enable_ack(hw_details.periph); + // i2c_enable_ack(hw_details.periph); /* NO ACK FOR SHT21! */ //i2c_set_dutycycle(hw_details.periph, I2C_CCR_DUTY_DIV2); /* default, no need to do this really */ + + /* --------- board specific settings! */ i2c_set_clock_frequency(hw_details.periph, I2C_CR2_FREQ_42MHZ); /* 42MHz / (100kHz * 2) */ i2c_set_ccr(hw_details.periph, 210); /* standard mode, freqMhz+1*/ i2c_set_trise(hw_details.periph, 43); + /* --------- end of board specific settings!*/ + i2c_peripheral_enable(hw_details.periph); +} + +static void sht21_send_data(uint32_t i2c, size_t n, uint8_t *data) +{ + while ((I2C_SR2(i2c) & I2C_SR2_BUSY)) { + } + + i2c_send_start(i2c); + + /* Wait for master mode selected */ + while (!((I2C_SR1(i2c) & I2C_SR1_SB) + & (I2C_SR2(i2c) & (I2C_SR2_MSL | I2C_SR2_BUSY)))); + + i2c_send_7bit_address(i2c, SENSOR_ADDRESS, I2C_WRITE); + + /* Waiting for address is transferred. */ + while (!(I2C_SR1(i2c) & I2C_SR1_ADDR)); + + /* Cleaning ADDR condition sequence. */ + uint32_t reg32 = I2C_SR2(i2c); + (void) reg32; /* unused */ + + size_t i; + for (i = 0; i < n; i++) { + i2c_send_data(i2c, data[i]); + while (!(I2C_SR1(i2c) & (I2C_SR1_BTF))); + } +} + +static void sht21_send_cmd(uint32_t i2c, uint8_t cmd) +{ + while ((I2C_SR2(i2c) & I2C_SR2_BUSY)) { + } + + i2c_send_start(i2c); + + /* Wait for master mode selected */ + while (!((I2C_SR1(i2c) & I2C_SR1_SB) + & (I2C_SR2(i2c) & (I2C_SR2_MSL | I2C_SR2_BUSY)))); + + i2c_send_7bit_address(i2c, SENSOR_ADDRESS, I2C_WRITE); + + /* Waiting for address is transferred. */ + while (!(I2C_SR1(i2c) & I2C_SR1_ADDR)); + + /* Cleaning ADDR condition sequence. */ + uint32_t reg32 = I2C_SR2(i2c); + (void) reg32; /* unused */ + + i2c_send_data(i2c, cmd); + while (!(I2C_SR1(i2c) & (I2C_SR1_BTF))); +} + +static void sht21_readn(uint32_t i2c, int n, uint8_t *res) +{ + //assert(n > 0); + i2c_send_start(i2c); + + i2c_enable_ack(i2c); + + /* Wait for master mode selected */ + while (!((I2C_SR1(i2c) & I2C_SR1_SB) + & (I2C_SR2(i2c) & (I2C_SR2_MSL | I2C_SR2_BUSY)))); + + i2c_send_7bit_address(i2c, SENSOR_ADDRESS, I2C_READ); + + /* Waiting for address is transferred. */ + while (!(I2C_SR1(i2c) & I2C_SR1_ADDR)); + /* Cleaning ADDR condition sequence. */ + uint32_t reg32 = I2C_SR2(i2c); + (void) reg32; /* unused */ + + int i = 0; + for (i = 0; i < n; ++i) { + if (i == n - 1) { + i2c_disable_ack(i2c); + } + while (!(I2C_SR1(i2c) & I2C_SR1_RxNE)); + res[i] = i2c_get_data(i2c); + } + i2c_send_stop(i2c); + + return; +} + +static float sht21_convert_temp(uint16_t raw) +{ + //assert((raw & 0x2) == 0x2); + raw &= ~0x3; /* Clear lower status bits */ + float tf = -46.85 + 175.72 * ((float) raw / 65536.0); + return tf; +} + +static float sht21_convert_humi(uint16_t raw) +{ + //assert((raw & 0x2) == 0); + raw &= ~0x3; /* Clear lower status bits */ + float tf = -6 + 125 * ((float) raw / 65536.0); + return tf; +} + +static float sht21_read_temp_hold(uint32_t i2c) +{ + // gpio_set(LED_DISCO_BLUE_PORT, LED_DISCO_BLUE_PIN); + sht21_send_cmd(i2c, SHT21_CMD_TEMP_HOLD); + + uint8_t data[3]; + sht21_readn(i2c, 2, data); + uint8_t crc = data[2]; + uint16_t temp = data[0] << 8 | data[1]; + printf("CRC=%#x, data0=%#x, data1=%#x\n", crc, data[0], data[1]); + // gpio_clear(LED_DISCO_BLUE_PORT, LED_DISCO_BLUE_PIN); + return sht21_convert_temp(temp); +} + +static float sht21_read_humi_hold(uint32_t i2c) +{ + // gpio_set(LED_DISCO_BLUE_PORT, LED_DISCO_BLUE_PIN); + sht21_send_cmd(i2c, SHT21_CMD_HUMIDITY_HOLD); + + uint8_t data[3]; + sht21_readn(i2c, 2, data); + uint8_t crc = data[2]; + uint16_t left = data[0] << 8 | data[1]; + printf("CRC=%#x, data0=%#x, data1=%#x\n", crc, data[0], data[1]); + + // gpio_clear(LED_DISCO_BLUE_PORT, LED_DISCO_BLUE_PIN); + return sht21_convert_humi(left); +} + +static void sht21_readid(void) +{ + sht21_send_cmd(I2C1, SHT21_CMD_READ_REG); + uint8_t raw; + sht21_readn(I2C1, 1, &raw); + printf("raw user reg = %#x\n", raw); + int resolution = ((raw & 0x80) >> 6) | (raw & 1); + printf("temp resolution is in %d bits\n", 14 - resolution); + printf("battery status: %s\n", (raw & (1 << 6) ? "failing" : "good")); + printf("On chip heater: %s\n", (raw & 0x2) ? "on" : "off"); + + uint8_t req1[] = {0xfa, 0x0f}; + uint8_t res[8]; + sht21_send_data(I2C1, 2, req1); + sht21_readn(I2C1, sizeof(res), res); + uint8_t req2[] = {0xfc, 0xc9}; + uint8_t res2[8]; + sht21_send_data(I2C1, 2, req2); + sht21_readn(I2C1, sizeof(res), res2); + printf("Serial = %02x%02x %02x%02x %02x%02x %02x%02x\n", + res2[3], res2[4], res[0], res[2], res[4], res[6], res2[0], res2[1]); +} + +void i2cm_task(void) +{ + sht21_readid(); + float temp = sht21_read_temp_hold(I2C1); + float humi = sht21_read_humi_hold(I2C1); + printf("Temp: %f C, RH: %f\n", temp, humi); + }
\ No newline at end of file diff --git a/tests/i2c-master/i2c-master.h b/tests/i2c-master/i2c-master.h index 5e41a9a..340dc39 100644 --- a/tests/i2c-master/i2c-master.h +++ b/tests/i2c-master/i2c-master.h @@ -19,6 +19,7 @@ extern "C" { void i2cm_init(void); + void i2cm_task(void); #ifdef __cplusplus } diff --git a/tests/i2c-master/main-stm32f4-disco.c b/tests/i2c-master/main-stm32f4-disco.c index f5594c0..1e30791 100644 --- a/tests/i2c-master/main-stm32f4-disco.c +++ b/tests/i2c-master/main-stm32f4-disco.c @@ -18,142 +18,47 @@ #define LED_DISCO_GREEN_PORT GPIOD #define LED_DISCO_GREEN_PIN GPIO12 -#define CODEC_ADDRESS 0x4a - struct hw_detail hw_details = { .periph = I2C1, .periph_rcc = RCC_I2C1, .periph_rst = RST_I2C1, - .pins = GPIO6 | GPIO9, /* FIXME - only for onboard! */ +// .pins = GPIO6 | GPIO9, /* FIXME - only for onboard! */ + .pins = GPIO8 | GPIO9, /* For SHT21 on I2c1 */ .port = GPIOB, .port_rcc = RCC_GPIOB, }; -static void codec_gpio_init(void) +static void setup_i2c_gpio(void) { /* reset pin */ - rcc_periph_clock_enable(RCC_GPIOD); - gpio_mode_setup(GPIOD, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO4); +// rcc_periph_clock_enable(RCC_GPIOD); +// gpio_mode_setup(GPIOD, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO4); /* i2c control lines */ - rcc_periph_clock_enable(RCC_GPIOB); - gpio_mode_setup(GPIOB, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO6 | GPIO9); - gpio_set_output_options(GPIOB, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, GPIO6 | GPIO9); - gpio_set_af(GPIOB, GPIO_AF4, GPIO6 | GPIO9); + rcc_periph_clock_enable(hw_details.port_rcc); + gpio_mode_setup(hw_details.port, GPIO_MODE_AF, GPIO_PUPD_NONE, hw_details.pins); + gpio_set_output_options(hw_details.port, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, hw_details.pins); + gpio_set_af(hw_details.port, GPIO_AF4, hw_details.pins); } static void codec_init(void) { int i; /* Configure the Codec related IOs */ - codec_gpio_init(); + setup_i2c_gpio(); /* reset the codec */ - gpio_clear(GPIOD, GPIO4); +// gpio_clear(GPIOD, GPIO4); for (i = 0; i < 1000000; i++) { /* Wait a bit. */ __asm__("NOP"); } - gpio_set(GPIOD, GPIO4); +// gpio_set(GPIOD, GPIO4); i2cm_init(); } -static int codec_write_reg(uint8_t reg, uint8_t val) -{ - uint32_t i2c = I2C1; - - while ((I2C_SR2(i2c) & I2C_SR2_BUSY)) { - } - - i2c_send_start(i2c); - - /* Wait for master mode selected */ - while (!((I2C_SR1(i2c) & I2C_SR1_SB) - & (I2C_SR2(i2c) & (I2C_SR2_MSL | I2C_SR2_BUSY)))); - - i2c_send_7bit_address(i2c, CODEC_ADDRESS, I2C_WRITE); - - /* Waiting for address is transferred. */ - while (!(I2C_SR1(i2c) & I2C_SR1_ADDR)); - - /* Cleaning ADDR condition sequence. */ - uint32_t reg32 = I2C_SR2(i2c); - (void) reg32; /* unused */ - - /* Common above here */ - - /* Sending the data. */ - i2c_send_data(i2c, reg); - while (!(I2C_SR1(i2c) & (I2C_SR1_BTF))); - i2c_send_data(i2c, val); - while (!(I2C_SR1(i2c) & (I2C_SR1_BTF | I2C_SR1_TxE))); - - /* Send STOP condition. */ - i2c_send_stop(i2c); - return 0; -} - -static uint32_t codec_read_reg(uint8_t reg) -{ - uint32_t i2c = I2C1; - - while ((I2C_SR2(i2c) & I2C_SR2_BUSY)) { - } - - i2c_send_start(i2c); - - /* Wait for master mode selected */ - while (!((I2C_SR1(i2c) & I2C_SR1_SB) - & (I2C_SR2(i2c) & (I2C_SR2_MSL | I2C_SR2_BUSY)))); - - i2c_send_7bit_address(i2c, CODEC_ADDRESS, I2C_WRITE); - - /* Waiting for address is transferred. */ - while (!(I2C_SR1(i2c) & I2C_SR1_ADDR)); - - /* Cleaning ADDR condition sequence. */ - uint32_t reg32 = I2C_SR2(i2c); - (void) reg32; /* unused */ - - /* Common stuff ABOVE HERE */ - - i2c_send_data(i2c, reg); - while (!(I2C_SR1(i2c) & (I2C_SR1_BTF))); - - i2c_send_start(i2c); - - /* Wait for master mode selected */ - while (!((I2C_SR1(i2c) & I2C_SR1_SB) - & (I2C_SR2(i2c) & (I2C_SR2_MSL | I2C_SR2_BUSY)))); - - i2c_send_7bit_address(i2c, CODEC_ADDRESS, I2C_READ); - - /* Waiting for address is transferred. */ - while (!(I2C_SR1(i2c) & I2C_SR1_ADDR)); - - i2c_disable_ack(i2c); - - /* Cleaning ADDR condition sequence. */ - reg32 = I2C_SR2(i2c); - (void) reg32; /* unused */ - - i2c_send_stop(i2c); - - while (!(I2C_SR1(i2c) & I2C_SR1_RxNE)); - uint32_t result = i2c_get_data(i2c); - - i2c_enable_ack(i2c); - I2C_SR1(i2c) &= ~I2C_SR1_AF; - return result; -} - -static void codec_readid(void) -{ - uint8_t res = codec_read_reg(0x01); - printf("raw res = %#x Codec is %#x (should be 0x1c), revision %d\n", res, res >> 3, res & 0x7); -} int main(void) { @@ -165,22 +70,13 @@ int main(void) LED_DISCO_GREEN_PIN); printf("hi guys!\n"); codec_init(); - codec_readid(); - codec_write_reg(0x14, 0xff); - for (i = 0; i < 8; i++) { - uint8_t pass_vol_a = codec_read_reg(0x14); - printf("Passthrough vol A was: %#x\n", pass_vol_a); - codec_write_reg(0x14, pass_vol_a >> 1); - gpio_toggle(LED_DISCO_GREEN_PORT, LED_DISCO_GREEN_PIN); - for (j = 0; j < 100000; j++) { /* Wait a bit. */ - __asm__("NOP"); - } - } - - /* Nothing else to do */; while (1) { - ; + i2cm_task(); + gpio_toggle(LED_DISCO_GREEN_PORT, LED_DISCO_GREEN_PIN); + for (i = 0; i < 0x800000; i++) { /* Wait a bit. */ + __asm__("NOP"); + } } return 0; } |