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HD44780: switch output from push pull to open drain

This commit is contained in:
King Kévin 2019-06-18 16:20:24 +02:00
parent babc3a5789
commit 1133e6a296
1 changed files with 54 additions and 20 deletions
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74
lib/lcd_hd44780.c
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@ -67,20 +67,54 @@
/** @defgroup lcd_hd44780_gpio GPIO used to control the HD44780
* @{
*/
/** register select
* @note is pulled up by HD44780
*/
#define LCD_HD44780_GPIO_RS PB9 /**< register select */
#if !LCD_HD44780_WRITE_ONLY
/** select read or write
* @note is pulled up by HD44780
*/
#define LCD_HD44780_GPIO_RW PB10 /**< select read or write */
#endif
#define LCD_HD44780_GPIO_E PB11 /**< start data read/write */
#define LCD_HD44780_GPIO_DB7 PB12 /**< data bit 7 */
#define LCD_HD44780_GPIO_DB6 PB13 /**< data bit 6 */
#define LCD_HD44780_GPIO_DB5 PB14 /**< data bit 5 */
#define LCD_HD44780_GPIO_DB4 PB15 /**< data bit 4 */
/** enable pin
* @warning needs an external 10k pull-up resistor
*/
#define LCD_HD44780_GPIO_E PB11
/** data bit
* @note is pulled up by HD44780
*/
#define LCD_HD44780_GPIO_DB7 PB12
/** data bit 6
* @note is pulled up by HD44780
*/
#define LCD_HD44780_GPIO_DB6 PB13
/** data bit 5
* @note is pulled up by HD44780
*/
#define LCD_HD44780_GPIO_DB5 PB14
/** data bit 4
* @note is pulled up by HD44780
*/
#define LCD_HD44780_GPIO_DB4 PB15
#if LCD_HD44780_INTERFACE_DL
#define LCD_HD44780_GPIO_DB3 P /**< data bit 3 */
#define LCD_HD44780_GPIO_DB2 P /**< data bit 2 */
#define LCD_HD44780_GPIO_DB1 P /**< data bit 1 */
#define LCD_HD44780_GPIO_DB0 P /**< data bit 0 */
/** data bit 3
* @note is pulled up by HD44780
*/
#define LCD_HD44780_GPIO_DB3 P
/** data bit 2
* @note is pulled up by HD44780
*/
#define LCD_HD44780_GPIO_DB2 P
/** data bit 1
* @note is pulled up by HD44780
*/
#define LCD_HD44780_GPIO_DB1 P
/** data bit 0
* @note is pulled up by HD44780
*/
#define LCD_HD44780_GPIO_DB0 P
#endif
/** @} */
@ -120,15 +154,15 @@ static void lcd_hd44780_db_direction(bool input)
#if !LCD_HD44780_WRITE_ONLY
gpio_clear(GPIO_PORT(LCD_HD44780_GPIO_RW), GPIO_PIN(LCD_HD44780_GPIO_RW)); // set low write
#endif
gpio_set_mode(GPIO_PORT(LCD_HD44780_GPIO_DB7), GPIO_MODE_OUTPUT_10_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO_PIN(LCD_HD44780_GPIO_DB7));
gpio_set_mode(GPIO_PORT(LCD_HD44780_GPIO_DB6), GPIO_MODE_OUTPUT_10_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO_PIN(LCD_HD44780_GPIO_DB6));
gpio_set_mode(GPIO_PORT(LCD_HD44780_GPIO_DB5), GPIO_MODE_OUTPUT_10_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO_PIN(LCD_HD44780_GPIO_DB5));
gpio_set_mode(GPIO_PORT(LCD_HD44780_GPIO_DB4), GPIO_MODE_OUTPUT_10_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO_PIN(LCD_HD44780_GPIO_DB4));
gpio_set_mode(GPIO_PORT(LCD_HD44780_GPIO_DB7), GPIO_MODE_OUTPUT_10_MHZ, GPIO_CNF_OUTPUT_OPENDRAIN, GPIO_PIN(LCD_HD44780_GPIO_DB7));
gpio_set_mode(GPIO_PORT(LCD_HD44780_GPIO_DB6), GPIO_MODE_OUTPUT_10_MHZ, GPIO_CNF_OUTPUT_OPENDRAIN, GPIO_PIN(LCD_HD44780_GPIO_DB6));
gpio_set_mode(GPIO_PORT(LCD_HD44780_GPIO_DB5), GPIO_MODE_OUTPUT_10_MHZ, GPIO_CNF_OUTPUT_OPENDRAIN, GPIO_PIN(LCD_HD44780_GPIO_DB5));
gpio_set_mode(GPIO_PORT(LCD_HD44780_GPIO_DB4), GPIO_MODE_OUTPUT_10_MHZ, GPIO_CNF_OUTPUT_OPENDRAIN, GPIO_PIN(LCD_HD44780_GPIO_DB4));
#if LCD_HD44780_INTERFACE_DL
gpio_set_mode(GPIO_PORT(LCD_HD44780_GPIO_DB3), GPIO_MODE_OUTPUT_10_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO_PIN(LCD_HD44780_GPIO_DB3));
gpio_set_mode(GPIO_PORT(LCD_HD44780_GPIO_DB2), GPIO_MODE_OUTPUT_10_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO_PIN(LCD_HD44780_GPIO_DB2));
gpio_set_mode(GPIO_PORT(LCD_HD44780_GPIO_DB1), GPIO_MODE_OUTPUT_10_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO_PIN(LCD_HD44780_GPIO_DB1));
gpio_set_mode(GPIO_PORT(LCD_HD44780_GPIO_DB0), GPIO_MODE_OUTPUT_10_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO_PIN(LCD_HD44780_GPIO_DB0));
gpio_set_mode(GPIO_PORT(LCD_HD44780_GPIO_DB3), GPIO_MODE_OUTPUT_10_MHZ, GPIO_CNF_OUTPUT_OPENDRAIN, GPIO_PIN(LCD_HD44780_GPIO_DB3));
gpio_set_mode(GPIO_PORT(LCD_HD44780_GPIO_DB2), GPIO_MODE_OUTPUT_10_MHZ, GPIO_CNF_OUTPUT_OPENDRAIN, GPIO_PIN(LCD_HD44780_GPIO_DB2));
gpio_set_mode(GPIO_PORT(LCD_HD44780_GPIO_DB1), GPIO_MODE_OUTPUT_10_MHZ, GPIO_CNF_OUTPUT_OPENDRAIN, GPIO_PIN(LCD_HD44780_GPIO_DB1));
gpio_set_mode(GPIO_PORT(LCD_HD44780_GPIO_DB0), GPIO_MODE_OUTPUT_10_MHZ, GPIO_CNF_OUTPUT_OPENDRAIN, GPIO_PIN(LCD_HD44780_GPIO_DB0));
#endif
}
lcd_hd44780_db_input = input; // remember direction
@ -282,15 +316,15 @@ void lcd_hd44780_setup(bool n_2lines, bool f_5x10)
lcd_hd44780_db_input = true; // all lines are inputs
rcc_periph_clock_enable(GPIO_RCC(LCD_HD44780_GPIO_RS)); // enable clock for GPIO port
gpio_clear(GPIO_PORT(LCD_HD44780_GPIO_RS), GPIO_PIN(LCD_HD44780_GPIO_RS)); // set low to read busy flag
gpio_set_mode(GPIO_PORT(LCD_HD44780_GPIO_RS), GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO_PIN(LCD_HD44780_GPIO_RS)); // set GPIO as output
gpio_set_mode(GPIO_PORT(LCD_HD44780_GPIO_RS), GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_OPENDRAIN, GPIO_PIN(LCD_HD44780_GPIO_RS)); // set GPIO as output
#if !LCD_HD44780_WRITE_ONLY
rcc_periph_clock_enable(GPIO_RCC(LCD_HD44780_GPIO_RW)); // enable clock for GPIO port
gpio_set(GPIO_PORT(LCD_HD44780_GPIO_RW), GPIO_PIN(LCD_HD44780_GPIO_RW)); // set high to read
gpio_set_mode(GPIO_PORT(LCD_HD44780_GPIO_RW), GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO_PIN(LCD_HD44780_GPIO_RW)); // set GPIO as output
gpio_set_mode(GPIO_PORT(LCD_HD44780_GPIO_RW), GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_OPENDRAIN, GPIO_PIN(LCD_HD44780_GPIO_RW)); // set GPIO as output
#endif
rcc_periph_clock_enable(GPIO_RCC(LCD_HD44780_GPIO_E)); // enable clock for GPIO port
gpio_clear(GPIO_PORT(LCD_HD44780_GPIO_E), GPIO_PIN(LCD_HD44780_GPIO_E)); // start idle low
gpio_set_mode(GPIO_PORT(LCD_HD44780_GPIO_E), GPIO_MODE_OUTPUT_10_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO_PIN(LCD_HD44780_GPIO_E)); // set GPIO as output
gpio_set_mode(GPIO_PORT(LCD_HD44780_GPIO_E), GPIO_MODE_OUTPUT_10_MHZ, GPIO_CNF_OUTPUT_OPENDRAIN, GPIO_PIN(LCD_HD44780_GPIO_E)); // set GPIO as output
// initialize device
sleep_ms(40 + 2); // wait for display to initialise after power on: 15 ms for VCC > 4.5 V, 40 ms for VCC > 2.7 V
lcd_hd44780_write(true, 0x30, true); // 1st function write set to go to state 1 (8-bit) or 2 (4-bit first nibble) (BF cannot be checked)