h3n3/klipper
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

lpc176x: Enable full speed peripheral clocks on SPI and I2C

Browse Source 
Scale the bus speed within the peripheral instead of on the system bus
as scaling on the system bus slows down general register access to the
peripheral.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor
2018-11-21 20:40:34 -05:00
parent 4bbd631086
commit cbbc6801a0
3 changed files with 8 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
src/lpc176x/i2c.c
View File

@@ -29,7 +29,8 @@ i2c_init(void)
gpio_peripheral(0, 1, 3, 0);
// Set 100Khz frequency
uint32_t PCLK = SystemCoreClock / 4, pulse = PCLK / (100000 * 2);
enable_peripheral_clock(PCLK_I2C1);
uint32_t pclk = SystemCoreClock, pulse = pclk / (100000 * 2);
LPC_I2C1->I2SCLL = pulse;
LPC_I2C1->I2SCLH = pulse;