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led_tm1637: minor, use new GPIO definition

This commit is contained in:
King Kévin 2020-02-17 14:23:15 +01:00
parent 3141075273
commit 2896185e45
2 changed files with 28 additions and 30 deletions
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52
lib/led_tm1637.c
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@ -12,10 +12,10 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
/** library to communicate with a Titan Micro TM1637 IC attached to a 4-digit 7-segment (code)
* @file led_tm1637.c
/** library to communicate with a Titan Micro TM1637 IC attached to a 4-digit 7-segment
* @file
* @author King Kévin <kingkevin@cuvoodoo.info>
* @date 2017
* @date 2017-2020
* @note peripherals used: GPIO @ref led_tm1637_gpio, timer @ref led_tm1637_timer
* @note the protocol is very similar to I2C but incompatible for the following reasons: the capacitance is too large for open-drain type output with weak pull-up resistors (push-pull needs to be used, preventing to get ACKs since no indication of the ACK timing is provided); the devices doesn't use addresses; the STM32 I2C will switch to receiver mode when the first sent byte (the I2C address) has last bit set to 1 (such as for address commands with B7=1 where B7 is transmitted last), preventing to send further bytes (the data byte after the address)
* @warning all calls are blocking
@ -45,10 +45,8 @@
/** @defgroup led_tm1637_gpio GPIO used to communication with TM1637 IC
* @{
*/
#define LED_TM1637_CLK_PORT B /**< port for CLK signal */
#define LED_TM1637_CLK_PIN 6 /**< pin for CLK signal */
#define LED_TM1637_DIO_PORT B /**< port for DIO signal */
#define LED_TM1637_DIO_PIN 7 /**< pin for DIO signal */
#define LED_TM1637_CLK_PIN PB6 /**< pin for CLK signal */
#define LED_TM1637_DIO_PIN PB7 /**< pin for DIO signal */
/** @} */
/** @defgroup led_tm1637_timer timer used to communication with TM1637 IC
@ -166,12 +164,12 @@ static const uint8_t ascii_7segments[] = {
void led_tm1637_setup(void)
{
// configure GPIO for CLK and DIO signals
rcc_periph_clock_enable(RCC_GPIO(LED_TM1637_CLK_PORT)); // enable clock for GPIO peripheral
gpio_set(GPIO(LED_TM1637_CLK_PORT), GPIO(LED_TM1637_CLK_PIN)); // idle high
gpio_set_mode(GPIO(LED_TM1637_CLK_PORT), GPIO_MODE_OUTPUT_10_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO(LED_TM1637_CLK_PIN)); // master start the communication (capacitance is to large for open drain), only switch to input for ack from slave
rcc_periph_clock_enable(RCC_GPIO(LED_TM1637_DIO_PORT)); // enable clock for GPIO peripheral
gpio_set(GPIO(LED_TM1637_DIO_PORT), GPIO(LED_TM1637_DIO_PIN)); // idle high
gpio_set_mode(GPIO(LED_TM1637_DIO_PORT), GPIO_MODE_OUTPUT_10_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO(LED_TM1637_DIO_PIN)); // master start the communication (capacitance is to large for open drain), only switch to input for ack from slave
rcc_periph_clock_enable(GPIO_RCC(LED_TM1637_CLK_PIN)); // enable clock for GPIO peripheral
gpio_set(GPIO_PORT(LED_TM1637_CLK_PIN), GPIO_PIN(LED_TM1637_CLK_PIN)); // idle high
gpio_set_mode(GPIO_PORT(LED_TM1637_CLK_PIN), GPIO_MODE_OUTPUT_10_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO_PIN(LED_TM1637_CLK_PIN)); // master start the communication (capacitance is to large for open drain), only switch to input for ack from slave
rcc_periph_clock_enable(GPIO_RCC(LED_TM1637_DIO_PIN)); // enable clock for GPIO peripheral
gpio_set(GPIO_PORT(LED_TM1637_DIO_PIN), GPIO_PIN(LED_TM1637_DIO_PIN)); // idle high
gpio_set_mode(GPIO_PORT(LED_TM1637_DIO_PIN), GPIO_MODE_OUTPUT_10_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO_PIN(LED_TM1637_DIO_PIN)); // master start the communication (capacitance is to large for open drain), only switch to input for ack from slave
// first clock then data high also stands for stop condition
// setup timer to create signal timing (each tick is used for a single GPIO transition)
@ -211,43 +209,43 @@ static bool led_tm1637_write(const uint8_t* data, size_t length)
led_tm1637_tick(); // wait to enforce minimum time since last write
// send start condition (DIO then CLK low)
gpio_clear(GPIO(LED_TM1637_DIO_PORT), GPIO(LED_TM1637_DIO_PIN)); // put DIO low
gpio_clear(GPIO_PORT(LED_TM1637_DIO_PIN), GPIO_PIN(LED_TM1637_DIO_PIN)); // put DIO low
led_tm1637_tick(); // wait for next tick
gpio_clear(GPIO(LED_TM1637_CLK_PORT), GPIO(LED_TM1637_CLK_PIN)); // put CLK low
gpio_clear(GPIO_PORT(LED_TM1637_CLK_PIN), GPIO_PIN(LED_TM1637_CLK_PIN)); // put CLK low
// send data bytes (MSb first)
for (size_t i=0; i<length; i++) { // send all bytes
uint8_t byte = data[i];
for (uint8_t b=0; b<8; b++) { // send all bits
if (byte&0x1) { // send a 1
gpio_set(GPIO(LED_TM1637_DIO_PORT), GPIO(LED_TM1637_DIO_PIN)); // put DIO high
gpio_set(GPIO_PORT(LED_TM1637_DIO_PIN), GPIO_PIN(LED_TM1637_DIO_PIN)); // put DIO high
} else {
gpio_clear(GPIO(LED_TM1637_DIO_PORT), GPIO(LED_TM1637_DIO_PIN)); // put DIO low
gpio_clear(GPIO_PORT(LED_TM1637_DIO_PIN), GPIO_PIN(LED_TM1637_DIO_PIN)); // put DIO low
}
byte >>= 1; // shift data
led_tm1637_tick(); // wait for next tick
gpio_set(GPIO(LED_TM1637_CLK_PORT), GPIO(LED_TM1637_CLK_PIN)); // put CLK high
gpio_set(GPIO_PORT(LED_TM1637_CLK_PIN), GPIO_PIN(LED_TM1637_CLK_PIN)); // put CLK high
led_tm1637_tick(); // wait for next tick (no DIO transition when CLK is high)
gpio_clear(GPIO(LED_TM1637_CLK_PORT), GPIO(LED_TM1637_CLK_PIN)); // put CLK low
gpio_clear(GPIO_PORT(LED_TM1637_CLK_PIN), GPIO_PIN(LED_TM1637_CLK_PIN)); // put CLK low
}
gpio_set_mode(GPIO(LED_TM1637_DIO_PORT), GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, GPIO(LED_TM1637_DIO_PIN)); // switch DIO as input to read ACK
gpio_set_mode(GPIO_PORT(LED_TM1637_DIO_PIN), GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, GPIO_PIN(LED_TM1637_DIO_PIN)); // switch DIO as input to read ACK
led_tm1637_tick(); // wait for next tick (when the slave should ACK)
gpio_set(GPIO(LED_TM1637_CLK_PORT), GPIO(LED_TM1637_CLK_PIN)); // put CLK high
if (gpio_get(GPIO(LED_TM1637_DIO_PORT), GPIO(LED_TM1637_DIO_PIN))) { // no ACK received
gpio_set(GPIO_PORT(LED_TM1637_CLK_PIN), GPIO_PIN(LED_TM1637_CLK_PIN)); // put CLK high
if (gpio_get(GPIO_PORT(LED_TM1637_DIO_PIN), GPIO_PIN(LED_TM1637_DIO_PIN))) { // no ACK received
to_return = false; // remember there was an error
break; // stop sending bytes
}
led_tm1637_tick(); // wait for next tick
gpio_clear(GPIO(LED_TM1637_CLK_PORT), GPIO(LED_TM1637_CLK_PIN)); // put CLK low
gpio_set_mode(GPIO(LED_TM1637_DIO_PORT), GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO(LED_TM1637_DIO_PIN)); // switch DIO back to output to send next byte
gpio_clear(GPIO_PORT(LED_TM1637_CLK_PIN), GPIO_PIN(LED_TM1637_CLK_PIN)); // put CLK low
gpio_set_mode(GPIO_PORT(LED_TM1637_DIO_PIN), GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO_PIN(LED_TM1637_DIO_PIN)); // switch DIO back to output to send next byte
}
// send stop condition
gpio_set_mode(GPIO(LED_TM1637_DIO_PORT), GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO(LED_TM1637_DIO_PIN)); // ensure DIO is output (in case no ACK as been received
gpio_set_mode(GPIO_PORT(LED_TM1637_DIO_PIN), GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO_PIN(LED_TM1637_DIO_PIN)); // ensure DIO is output (in case no ACK as been received
led_tm1637_tick(); // wait for next tick
gpio_set(GPIO(LED_TM1637_CLK_PORT), GPIO(LED_TM1637_CLK_PIN)); // put CLK high
gpio_set(GPIO_PORT(LED_TM1637_CLK_PIN), GPIO_PIN(LED_TM1637_CLK_PIN)); // put CLK high
led_tm1637_tick(); // wait for next tick
gpio_set(GPIO(LED_TM1637_DIO_PORT), GPIO(LED_TM1637_DIO_PIN)); // put DIO high
gpio_set(GPIO_PORT(LED_TM1637_DIO_PIN), GPIO_PIN(LED_TM1637_DIO_PIN)); // put DIO high
timer_disable_counter(TIM(LED_TM1637_TIMER)); // stop timer since it's not used anymore
return to_return;

6
lib/led_tm1637.h
View File

@ -12,10 +12,10 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
/** library to communicate with a Titan Micro TM1637 IC attached to a 4-digit 7-segment (API)
* @file led_tm1637.h
/** library to communicate with a Titan Micro TM1637 IC attached to a 4-digit 7-segment
* @file
* @author King Kévin <kingkevin@cuvoodoo.info>
* @date 2017
* @date 2017-2020
* @note peripherals used: GPIO @ref led_tm1637_gpio, timer @ref led_tm1637_timer
* @warning all calls are blocking
*/